Themed collection Journal of Materials Chemistry A HOT Papers
Pivotal role of the Pourbaix diagram in electrocatalysis
Pourbaix diagram is a critical tool in electrocatalytic research, driving innovation and improving the reliability of catalyst development.
J. Mater. Chem. A, 2024, Advance Article
https://doi.org/10.1039/D4TA05476H
Emerging electrochemical humidity sensors for zero power consumption and self-powered humidity detection: a perspective
This perspective summarizes recent advances in electrochemical humidity sensors and mainly focuses on three aspects: working principles; humidity sensing and power generation performances; self-powered humidity detection system.
J. Mater. Chem. A, 2024,12, 14975-14985
https://doi.org/10.1039/D3TA06283J
Hydrogen generation from atmospheric water
Green hydrogen, produced by water splitting with renewables, faces water scarcity issues. Atmospheric moisture, a stable source, offers an alternative. This article reviews technologies and challenges of using atmospheric water for H2 production.
J. Mater. Chem. A, 2024,12, 12381-12396
https://doi.org/10.1039/D4TA00848K
MXene-based Materials: Potential High-Performance Electrodes for Aqueous Ion Batteries
J. Mater. Chem. A, 2024, Accepted Manuscript
https://doi.org/10.1039/D4TA05711B
When electrocatalytic nitrate reduction meets copper-based atomic site catalysts
This manuscript comprehensively reviews the recent advancements in Cu-based atomic site catalysts in the NO3RR, following a sequential order with six sections: Introduction, Mechanism, Cu-based SACs, Cu-based SAAs, Cu-based DACs, and Perspectives.
J. Mater. Chem. A, 2024,12, 26367-26389
https://doi.org/10.1039/D4TA04389H
Boosting the efficiency of electrocatalytic water splitting via in situ grown transition metal sulfides: a review
This review provides an in-depth analysis of the key aspects related to in situ grown TMS electrodes, including the selection of TMS active materials, various substrates, and materials engineering.
J. Mater. Chem. A, 2024, Advance Article
https://doi.org/10.1039/D4TA06197G
Latest advances in in situ and operando X-ray-based techniques for the characterisation of photoelectrocatalytic systems
The present review gives an overview of the different state-of-the-art X-ray techniques employed for the characterisation of photoelectrocatalytic systems, focusing on the possibilities of the studied techniques, cell designs and relevant results.
J. Mater. Chem. A, 2024,12, 23125-23146
https://doi.org/10.1039/D4TA03068K
Recent advances and perspectives of 1D/2D carbon materials for high-performance flexible zinc ion batteries
This review provides a summary of recent advancements in 1D/2D carbon materials (carbon nanotubes, graphene, MXenes, and carbon fibers) for FZIBs. It mainly introduces the functions of 1D/2D carbon materials in enhancing the performance of FZIBs.
J. Mater. Chem. A, 2024,12, 21531-21552
https://doi.org/10.1039/D4TA03650F
Electrochemical CO2 reduction on Pd-based electrodes: from mechanism understanding to rational catalyst design
This review summarizes the progressive understanding of the mechanism of the Pd-catalyzed CO2 reduction reaction, together with recent advances in the rational design of Pd-based electrocatalysts.
J. Mater. Chem. A, 2024,12, 21515-21530
https://doi.org/10.1039/D4TA02379J
Hybrid passive cooling: towards the next breakthrough of radiative sky cooling technology
A critical review of the regulatory mechanisms, structural design, cooling performance, and applications of hybrid cooling to advance its commercial use in passive cooling.
J. Mater. Chem. A, 2024,12, 21490-21514
https://doi.org/10.1039/D4TA03122A
Regulation of intermediate microenvironment for efficient C–C coupling in electrochemical CO2 reduction
This review summarizes the recent progress in the regulation of local reaction intermediates and protons near active sites and discusses how their microenvironment affects the C–C coupling efficiency in the electrocatalytic CO2RR.
J. Mater. Chem. A, 2024,12, 20507-20526
https://doi.org/10.1039/D4TA02224F
CO2-tolerant perovskite cathodes for enhanced solid oxide fuel cells: advancements, challenges, and strategic perspectives
This review analyzes advancements in CO2-resistant perovskite cathodes for solid oxide fuel cells, detailing CO2-poisoning mechanisms, evaluation methods, enhancement strategies, and characterization techniques for future cathode development.
J. Mater. Chem. A, 2024,12, 19606-19626
https://doi.org/10.1039/D4TA02455A
Functional high-entropy alloys: promising catalysts for high-performance water splitting
State-of-the-art HEAs with outstanding water splitting performance is rationally designed, which provides a blueprint for the design of a next-generation platform for hydrogen regeneration.
J. Mater. Chem. A, 2024,12, 18705-18732
https://doi.org/10.1039/D4TA02271H
Recent advances in scanning electrochemical microscopy for probing the sites in electrocatalysts
In this review, we summarized the application methods of SECM in electrochemical reactions and also discussed the challenges and prospects of SECM in characterizing the activity of electrocatalysts.
J. Mater. Chem. A, 2024,12, 18733-18750
https://doi.org/10.1039/D4TA01292E
Review of carbon-support-free platinum and non-platinum catalysts for polymer electrolyte fuel cells: will they feature in future vehicles?
Carbon-support-free platinum and non-platinum catalysts are reviewed to clarify the source of recent controversial results and to propose experimental conditions for their use in future fuel cell vehicles.
J. Mater. Chem. A, 2024,12, 18636-18673
https://doi.org/10.1039/D4TA02664K
Prospects of polymer coatings for all solid-state and emerging Li-ion batteries
We summarize the influence of polymer coatings on cathode particles for electrochemical energy storage applications. We report on the effect of different polymer types, their properties, and their influence on thermo-electro-chemical behavior.
J. Mater. Chem. A, 2024,12, 14186-14205
https://doi.org/10.1039/D4TA01061B
Carbon-based double-metal-site catalysts: advances in synthesis and energy applications
Dual-metal site catalysts embedded in a carbon matrix (referred to as DMSCs) are gaining significant interest in sustainable energy research.
J. Mater. Chem. A, 2024,12, 11749-11770
https://doi.org/10.1039/D4TA00727A
Structure–property–performance relationship of vanadium- and manganese-based metal–organic frameworks and their derivatives for energy storage and conversion applications
The current review discusses on vanadium- and manganese-based metal–organic frameworks and their derivatives for energy storage and conversion applications along with the potential future advancements in these fields.
J. Mater. Chem. A, 2024,12, 11149-11175
https://doi.org/10.1039/D4TA00736K
Advances in the direct electro-conversion of captured CO2 into valuable products
A comprehensive review of direct captured CO2 electro-conversion technology, a promising Carbon Capture and Utilization (CCU) technology that can achieve both techno-economic and environmental viability.
J. Mater. Chem. A, 2024,12, 10597-10613
https://doi.org/10.1039/D4TA01178C
A review of noble metal-free high entropy alloys for water splitting applications
Nano-sized high entropy alloy (HEA) catalysts have attracted much attention as extraordinary electrocatalysts in water-splitting applications, i.e., the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER).
J. Mater. Chem. A, 2024,12, 9933-9961
https://doi.org/10.1039/D4TA00690A
Doping engineering of phosphorus-based polyanion-type cathodes for sodium storage: a review
This review addresses four key factors and underlying mechanisms of doping engineering from crystal-field, molecular orbital, and ligand-field theory.
J. Mater. Chem. A, 2024,12, 9268-9295
https://doi.org/10.1039/D4TA00652F
Metal/covalent–organic framework based thin film nanocomposite membranes for advanced separations
Metal/covalent organic frameworks (MOFs/COFs), with orderly aligned pores and adjustable pore characteristics, offer advantages over traditional fillers in constructing thin film nanocomposite (TFN) membranes for task-specific separations.
J. Mater. Chem. A, 2024,12, 7975-8013
https://doi.org/10.1039/D4TA00578C
Exploring the mechanisms of magnetic fields in supercapacitors: material classification, material nanostructures, and electrochemical properties
The review illustrates that the magnetic field effect can promote the generation of different nanostructures in material synthesis, achieve the transition from 1D to 2D and 3D structures in material assembly and improve the energy density of supercapacitor by the direct and indirect roles.
J. Mater. Chem. A, 2024,12, 6165-6189
https://doi.org/10.1039/D3TA07658J
Recent advances on metal–organic frameworks for deep purification of olefins
The efficient removal of trace impurities is significant for the production of high-purity olefins. This review summarizes the latest advancements in the deep purification of ethylene and propylene using MOF materials.
J. Mater. Chem. A, 2024,12, 5563-5580
https://doi.org/10.1039/D4TA00330F
Breaking the symmetry of sulfur defect states via atomic substitution for enhanced CO2 photoreduction
Asymmetric sulfur vacancies were incorporated into defective SnS2 through a Cu dopant, aimed at preserving the energy of photoexcited electrons and strengthening the metal–sulfur covalency.
J. Mater. Chem. A, 2024,12, 27220-27228
https://doi.org/10.1039/D4TA06622G
Interfacial charge transfer driven by surface termination-controlled Ti2C MXene for enhanced hydrogen storage in magnesium
The Mg@DL-Ti2CClx composite, synthesized using MXene with partially removed terminal groups, shows enhanced hydrogen storage properties by forming a direct Ti–Mg interface which promotes charge transfer and weakens the Mg–H bond.
J. Mater. Chem. A, 2024,12, 27212-27219
https://doi.org/10.1039/D4TA04563G
Piezoelectric MoS2 with expanded interlayers: a flexible anode for a “zero” interfacial quasi-solid-state ammonium-ion asymmetric supercapacitor
The unique piezoelectric effect of Exp-MoS2 significantly promotes NH4+ transfer and leads to a faster diffusion rate, making Exp-MoS2/CC act as an outstanding anode of an integrated ammonium-ion asymmetric supercapacitor.
J. Mater. Chem. A, 2024,12, 24084-24090
https://doi.org/10.1039/D4TA04691A
Regulating the d-band center of Pt for highly effective H2 storage through toluene hydrogenation at low temperatures
The d-band center of Pt nanoparticles has been demonstrated as an effective parameter for modulating their catalytic activity for toluene hydrogenation, thereby promoting the H2 strong in liquid organic molecules.
J. Mater. Chem. A, 2024,12, 23392-23397
https://doi.org/10.1039/D4TA04152F
Electrochemical dealloying of a high-chromium alloy at oxygen evolution potential
We first investigate the electrochemical dealloying effect and mechanism of a high-chromium alloy in alkaline NaNO3 solution at oxygen evolution potential.
J. Mater. Chem. A, 2024,12, 22487-22493
https://doi.org/10.1039/D4TA04441J
Electrochemical CO2-to-CO via enriched oxygen vacancies at gold/ceria interfaces
We report a strategy of catalyst design to modulate oxygen vacancies through the control of Au/ceria interface structures, promoting Au activity for carbon monoxide production in carbon dioxide electroreduction.
J. Mater. Chem. A, 2024,12, 21716-21722
https://doi.org/10.1039/D4TA03768E
Chemical pre-lithiation of LiMn2O4 balances the low first cycle efficiency of silicon anodes
Prelithiation of LiMn2O4 balances the low first cycle efficiency of silicon anodes for improvements in energy density and prospective cell chemistry enabled by naturally abundant elements.
J. Mater. Chem. A, 2024,12, 14354-14359
https://doi.org/10.1039/D4TA02544J
Tailoring bismuth defects in Bi2WO6 nanosheets for photocatalytic C–H activation
Tailoring the bismuth defects in ultrathin Bi2WO6 nanosheets can efficiently activate the C–H bond in toluene to produce benzaldehyde under light irradiation.
J. Mater. Chem. A, 2024,12, 11841-11847
https://doi.org/10.1039/D4TA01573H
Novel heat storage ionomer binder for thermal management of Li-ion batteries
A novel heat storage ionomer binder with highly efficient heat-storage ability is proposed to function as an internal temperature conditioner, which allows the battery to function steadily over a wider temperature range.
J. Mater. Chem. A, 2024,12, 7508-7514
https://doi.org/10.1039/D3TA07490K
Adsorptive molecular sieving of aromatic hydrocarbons over cyclic aliphatic hydrocarbons via an intrinsic/extrinsic approach
An efficient adsorptive molecular sieving strategy to separate aromatic and cyclic aliphatic hydrocarbons via an intrinsic/extrinsic approach.
J. Mater. Chem. A, 2024,12, 6875-6879
https://doi.org/10.1039/D3TA06602A
Three-dimensional porous NiCoP foam enabled high-performance overall seawater splitting at high current density
Three-dimensional porous NiCoP foam supported on Ni foam is a superb bifunctional electrocatalyst for overall seawater splitting, attaining a large current density of 1000 mA cm−2 at a low cell voltage of 1.97 V with robust stability over 300 hours.
J. Mater. Chem. A, 2024,12, 2680-2684
https://doi.org/10.1039/D3TA07898A
A novel synthesis method for nitrogen-rich energetic frameworks containing bistetrazoles: assembling an advanced high-energy density material with high nitrogen content and good oxygen balance
Target compound BDNTT exhibits excellent detonation performance and indicates the potential as a novel type of high-energy density material (HEDM).
J. Mater. Chem. A, 2024, Advance Article
https://doi.org/10.1039/D4TA05721J
Point-defect chemistry for ionic conduction in solid electrolytes with isovalent cation mixing
J. Mater. Chem. A, 2024, Accepted Manuscript
https://doi.org/10.1039/D4TA05684A
A multi-step charging/discharging protocol enables stable cycling for lithium argyrodite-based all-solid-state lithium batteries
A multi-step constant-current charging/discharging (MCCCD) protocol was proposed to reduce the damage to the lithium metal anode and further improve the cycle performance of the all-solid-state battery.
J. Mater. Chem. A, 2024, Advance Article
https://doi.org/10.1039/D4TA06075J
Improved Charge Delivery within Covalently Ligated Cobalt Phthalocyanine Electrocatalyst for CO2 Reduction
J. Mater. Chem. A, 2024, Accepted Manuscript
https://doi.org/10.1039/D4TA03220A
Biomass Zein Improved GF Separator for Dendrite-Free Aqueous Zinc-Ion Batteries
J. Mater. Chem. A, 2024, Accepted Manuscript
https://doi.org/10.1039/D4TA06336H
Asymmetric liquid crystalline donors with two different end groups enable efficient all-small-molecule organic solar cells
J. Mater. Chem. A, 2024, Accepted Manuscript
https://doi.org/10.1039/D4TA06126H
Probing the Key Roles of Back-Interface in Performance of Carbon-Based Hole-Transport-Layer Free Perovskite Solar Cells
J. Mater. Chem. A, 2024, Accepted Manuscript
https://doi.org/10.1039/D4TA06143H
Polymeric ionic conductor networks enable stable cycling of high-voltage lithium metal batteries using solid-state poly-ether electrolytes
Polymeric ionic conductor networks are designed and fabricated to effectively prevent the oxidative decomposition of the poly(1,3-dioxolane) electrolyte on the LiCoO2 cathode surface, thereby enabling stable cycling of solid-state LiCoO2‖Li cells.
J. Mater. Chem. A, 2024, Advance Article
https://doi.org/10.1039/D4TA05468G
One-pot synthesized plasmonic black gold nanoparticles for efficient photocatalytic CO oxidation
The one-pot synthesis of plasmonic black gold will facilitate rapid exploration of black gold's applications in a range of fields and also pave the way for scalable industrial deployment.
J. Mater. Chem. A, 2024,12, 27235-27245
https://doi.org/10.1039/D4TA05117C
Fluorine-rich deep eutectic electrolytes enabling robust interphases and nonflammability of high-voltage lithium metal batteries
A nonflammable fluorine-rich deep eutectic electrolyte (DEE) promotes LiF-rich and Li3N-rich robust interphases on both lithium metal anode and high-voltage cathode sides, endowing 4.5 V Li-metal batteries with exceptional cycling stability.
J. Mater. Chem. A, 2024,12, 27269-27279
https://doi.org/10.1039/D4TA04316B
Four-way diffusion in miniaturised devices of reverse electrodialysis
A novel four-way diffusion structure for Reverse Electrodialysis (RED), named compact RED (cRED), addresses the stability and power density challenges of the conventional series design, leading to substantial improvements in both metrics.
J. Mater. Chem. A, 2024,12, 27296-27302
https://doi.org/10.1039/D4TA03746D
Insights into the conversion mechanism of the restriction strategy and self-activation enabled high-performance manganese fluoride anodes
A growth-limited and self-polymerizing carbon layer-coated fluoride electrode creates refined nanodomains during cycling that cooperate with amorphous phases to promote Li+ conduction, providing excellent cycling life and specific capacity.
J. Mater. Chem. A, 2024,12, 27286-27295
https://doi.org/10.1039/D4TA04041D
A Nix:Vy–Se nanoparticle decorated hierarchical porous Zn–Co–P nanowire array electrode for high energy density asymmetric supercapacitors
Using a novel bi-metallic Nix:Vy–Se/Zn–Co–P heterogeneous electrode as a high-performance positive electrode, a high energy density asymmetric solid-state supercapacitor device is fabricated.
J. Mater. Chem. A, 2024,12, 27257-27268
https://doi.org/10.1039/D4TA03570D
Ultrathin iridium carbonyl formate for efficient and durable acidic oxygen evolution electrocatalysis
Iridium carbonyl formate nanoflakes were fabricated swiftly via a liquid-phase microwave method, showcasing a remarkable acidic water oxidation performance and sustaining operation in proton exchange membrane electrolysis at 1.0 A cm−2 for 100 h.
J. Mater. Chem. A, 2024,12, 27280-27285
https://doi.org/10.1039/D4TA04064C
Tailoring the Biobased Polythiourethane Crosslinking Networks with Flame-Retardancy and Remote Ultrafast Infrared “Welding” Performance
J. Mater. Chem. A, 2024, Accepted Manuscript
https://doi.org/10.1039/D4TA05966B
Enhancing the Surface Lewis Basicity of Phosphorene-Hosted NiO Nanosheets for Sensitive and Selective H2S Gas Sensing
J. Mater. Chem. A, 2024, Accepted Manuscript
https://doi.org/10.1039/D4TA05682E
The composition / field-induced octahedral tilt, domain switch and improved piezoelectric properties in BF-BT ceramics across phase transition
J. Mater. Chem. A, 2024, Accepted Manuscript
https://doi.org/10.1039/D4TA03949A
Non-porous two-dimensional conducting metal–organic frameworks with enhanced capacitance
Two pyrazine-MOFs with AB-stacked geometry, which block pore channels, were synthesized to enhance capacitive performance without in-channel mass transport.
J. Mater. Chem. A, 2024, Advance Article
https://doi.org/10.1039/D4TA05484A
A nanobelt structure as a photocatalyst assembled from molecular cobalt complexes boosts hydrogen evolution
Highly ordered supramolecular nanobelt structures self-assembled via π–π interactions boost photocatalytic hydrogen evolution.
J. Mater. Chem. A, 2024, Advance Article
https://doi.org/10.1039/D4TA05432F
Spin-induced electron transfer simultaneously enhances the intrinsic activity and stability of amorphous MoSx-based materials toward efficient hydrogen evolution
A novel strategy for spin-state regulation has been proposed to promote charge transfer, strengthen the Mo–S bond and activate S atoms of the MoSx-based materials for simultaneously enhancing the intrinsic activity and stability toward efficient HER.
J. Mater. Chem. A, 2024, Advance Article
https://doi.org/10.1039/D4TA04756G
Down-converting ultraviolet light using a conductive passivator to enhance the efficiency and stability of perovskite solar cells
DSDA simultaneously down-converts ultraviolet light and enhances the conductivity of SnO2; DSDA effectively passivates defects at the SnO2/perovskite interface while providing in situ protection against lead leakage.
J. Mater. Chem. A, 2024, Advance Article
https://doi.org/10.1039/D4TA05782A
Sulfur-doped g-C3N4/V2C MXene Schottky junctions for superior photocatalytic H2 evolution
J. Mater. Chem. A, 2024, Accepted Manuscript
https://doi.org/10.1039/D4TA05929H
Pottery glaze-derived sintering aids for the synthesis of NASICON electrolytes with high ionic conductivity and relative density
The glaze component is successfully utilized as a sintering aid to obtain a NASICON with high Na+ conductivity and relative density.
J. Mater. Chem. A, 2024, Advance Article
https://doi.org/10.1039/D4TA05865H
Inorganic ligand-protected synthesis and characterization of a {Ag6} cluster within an annular polyoxometalate
A new type of POM-encapsulated {Ag6} cluster has exhibited a high proton conductivity of 3.0 × 10−2 S cm−1 at 368 K and 98% RH and excellent catalytic activity for reduction of nitrobenzene with 98.55% conversion and >99% selectivity in 2.5 h.
J. Mater. Chem. A, 2024, Advance Article
https://doi.org/10.1039/D4TA05238B
Carbon nanotubes as hole-selective contacts for high-efficiency full-area GaAs hybrid heterojunction solar cells
A schematic of the full-area GaAs/NP hybrid HJSC configuration and the energy band diagram of its heterojunction upon illumination.
J. Mater. Chem. A, 2024, Advance Article
https://doi.org/10.1039/D4TA05391E
Optimization of Electron Transfer Kinetics Between Photoanode and Biocathode for Enhanced Carbon-Neutral Pollutant Removal in Photocatalytic Fuel Cells
J. Mater. Chem. A, 2024, Accepted Manuscript
https://doi.org/10.1039/D4TA05290K
Strong Metal-support Interaction (SMSI) Modulates d-orbital Centers to Promote Oxygen Reduction Reaction
J. Mater. Chem. A, 2024, Accepted Manuscript
https://doi.org/10.1039/D4TA05972G
CeO2-regulated NiCoOOH formed via electrocatalytic self-reconstruction of NiCoCe-MOFs for efficient electro-oxidation of 5-hydroxymethylfurfural
CeO2/NiCoOOH was fabricated by self-reconstruction of NiCoCe-MOF. CeO2 acts as an ‘electron trap’, refining the electronic configuration of NiCoOOH, expediting the electron transfer kinetics and improving the electrocatalytic performance.
J. Mater. Chem. A, 2024, Advance Article
https://doi.org/10.1039/D4TA05493H
Promoting Fast Potassium Storage in CoSe2/VSe2 Non-Layered/Layered Heterostructured Nanofibers
J. Mater. Chem. A, 2024, Accepted Manuscript
https://doi.org/10.1039/D4TA06049K
A dual-crosslinked macroporous aerogel with enhanced mechanical durability for efficient solar-driven desalination of seawater and wastewater
Gelatin–CNF–CNT aerogels with durable mechanical properties used for efficient interfacial solar evaporation.
J. Mater. Chem. A, 2024, Advance Article
https://doi.org/10.1039/D4TA05732E
Mediation of the electrochemical polarization for durable zinc anode
A KSeCN electrolyte additive for aqueous zinc ion batteries enhances the electrochemical polarization of the zinc anode while mitigating concentration polarization, leading to more uniform Zn plating.
J. Mater. Chem. A, 2024,12, 26568-26577
https://doi.org/10.1039/D4TA05264A
Revealing the mass transfer of proton donors for tailoring hydrogen evolution coupled with manganese electrodeposition
The implementation of a rotating cylindrical cathode for manganese deposition offers a novel perspective in comprehending the conjugated hydrogen evolution reaction within complex solution systems.
J. Mater. Chem. A, 2024,12, 26544-26554
https://doi.org/10.1039/D4TA02089H
Optimizing ionic transport in argyrodites: a unified view on the role of sulfur/halide distribution and local environments
Uniform bromine and sulfur ion distribution across sublattices in Li7−xPS6−xBrx argyrodites is key to high Li-ion conductivity. It enhances Li-ion transport by balancing high- and low-energy jump environments, enabling lower energy percolation.
J. Mater. Chem. A, 2024,12, 26596-26611
https://doi.org/10.1039/D4TA04628E
Structural and catalytic regulation in a rigid Zr-MOF through linker installation
A rigid MOF with a (4,6)-connected she-net was prepared, which could further incorporate bpy(Cu) active centers through linker installation. Structure and size-selective catalytic activity for aerobic alcohol oxidation reactions can be regulated.
J. Mater. Chem. A, 2024,12, 26578-26585
https://doi.org/10.1039/D4TA04944F
Restraining unfavorable phases via reduced spatial hindrance of ultra small-sized molecules to enable high-performance quasi-two-dimensional perovskite solar cells
A facile approach is proposed by utilizing a series of small molecules with different spatial hindrance to suppress low-n phases and explore the underlying regulatory kinetics mechanisms.
J. Mater. Chem. A, 2024,12, 26586-26595
https://doi.org/10.1039/D4TA05004E
About this collection
This on-going web collection features all the articles published in Journal of Materials Chemistry A in 2024 marked as HOT, as recommended by referees. Congratulations to all the authors whose articles are featured!