Themed collection Global Energy Challenges: Hydrogen Energy
Why conclusions from platinum model surfaces do not necessarily lead to enhanced nanoparticle catalysts for the oxygen reduction reaction
Platinum model-surface and nanoparticle catalysts for the oxygen reduction reaction are enhanced by the presence of concave sites.
Single-atom catalysts for CO2 electroreduction with significant activity and selectivity improvements
We propose the great potential of single atom catalysts (SACs) for CO2 electroreduction with high activity and selectivity predictions over a competitive H2 evolution reaction. We find the lack of an atomic ensemble for adsorbate binding and unique electronic structure of the single atom catalysts play an important role.
Gradient doping of phosphorus in Fe2O3 nanoarray photoanodes for enhanced charge separation
Highly-oriented Fe2O3 nanoarrays with a gradient phosphorus concentration result in enhanced charge separation in the bulk for photoelectrochemical water oxidation.
A low-crystalline ruthenium nano-layer supported on praseodymium oxide as an active catalyst for ammonia synthesis
Low-crystalline Ru nano-layers and the strong basicity of Ru/Pr2O3 synergistically accelerated the rate-determining step of ammonia synthesis.
Covalent triazine framework supported non-noble metal nanoparticles with superior activity for catalytic hydrolysis of ammonia borane: from mechanistic study to catalyst design
Development of non-noble metal catalysts with similar activity and stability to noble metals is of significant importance in the conversion and utilization of clean energies.
Proton-coupled electron transfer in the electrocatalysis of CO2 reduction: prediction of sequential vs. concerted pathways using DFT
We provide a complete and computationally detailed picture of the mechanism of the initial stages of the electrocatalytic reduction of CO2 in water catalysed by cobalt porphyrin complexes.
Achievement of visible-light-driven Z-scheme overall water splitting using barium-modified Ta3N5 as a H2-evolving photocatalyst
Barium-modified Ta3N5 for the promotion of proton reduction is first employed as a H2-evolving photocatalyst for visible-light-driven Z-scheme overall water splitting.
Metalloporphyrin-modified semiconductors for solar fuel production
A novel synthetic method is used to prepare metalloporphyrin-modified gallium phosphide photocathodes for solar-driven hydrogen evolution from water.
How covalence breaks adsorption-energy scaling relations and solvation restores them
We show that under vacuum various metalloporphyrins break the scaling relation between the adsorption energies of *OH and *OOH, which can potentially boost oxygen reduction and evolution. In aqueous solution, however, such scaling relation is restored.
Ru–protein–Co biohybrids designed for solar hydrogen production: understanding electron transfer pathways related to photocatalytic function
Two ruthenium-protein-cobaloxime biohybrids produce photocatalytic hydrogen through different catalytic pathways characterized by EPR and transient optical spectroscopies.
Rhenium(I) trinuclear rings as highly efficient redox photosensitizers for photocatalytic CO2 reduction
Trinuclear Re(I)-rings were applied as redox photosensitizers in visible light-driven CO2 reduction in tandem with various catalysts, i.e., Re(I)-, Ru(II)- and Mn(I)-diimine metal complex. The quantum yields for the Ru(II) and Mn(I) catalysts were the among highest reported.
Accessing and predicting the kinetic profiles of homogeneous catalysts from volcano plots
Volcano plots, which generally describe only thermodynamics, are expanded to include kinetics that markedly influence the performance of homogeneous catalysts.
Thin film transfer for the fabrication of tantalum nitride photoelectrodes with controllable layered structures for water splitting
Controlled layered structures fabricated by thin film transfer enhance the photoelectrochemical water splitting on Ta3N5 photoanodes.
Photoelectrochemical hydrogen production in water using a layer-by-layer assembly of a Ru dye and Ni catalyst on NiO
Layer-by-layer assembly of a Ru dye and Ni catalyst on a p-type NiO photocathode enables photoelectrochemical H2 generation in water.
Essential role of hydride ion in ruthenium-based ammonia synthesis catalysts
Ruthenium-loaded metal hydrides with hydrogen vacancies function as efficient catalysts for ammonia synthesis under low temperature and low pressure conditions.
Visible-light-driven CO2 reduction on a hybrid photocatalyst consisting of a Ru(II) binuclear complex and a Ag-loaded TaON in aqueous solutions
A hybrid photocatalytic system consisting of a Ru(II) binuclear complex and Ag-loaded TaON can reduce CO2 to HCOOH by visible light irradiation even in aqueous solution (TONHCOOH = 750, ΦHCOOH = 0.48%).
Precious-metal free photoelectrochemical water splitting with immobilised molecular Ni and Fe redox catalysts
Splitting water into hydrogen and oxygen with 3d transition metal molecular catalysts and light has been accomplished.
Porous single-crystalline AuPt@Pt bimetallic nanocrystals with high mass electrocatalytic activities
This paper describes the design and synthesis of porous single-crystalline AuPt@Pt bimetallic nanocrystals with excellent mass activities for the oxygen reduction reaction and formic acid oxidation.
Overall water splitting by Pt/g-C3N4 photocatalysts without using sacrificial agents
Direct splitting of pure water into H2 and O2 in a stoichiometric molar ratio of 2 : 1 by conjugated polymers via a 4-electron pathway was established for the first time, as demonstrated here using a g-C3N4 polymer and redox co-catalysts of Pt and Co species.
Decoration of Pt on Cu/Co double-doped CeO2 nanospheres and their greatly enhanced catalytic activity
In this paper, we report an efficient strategy for the synthesis of Cu/Co double-doped CeO2 nanospheres (CuxCo1−x–CeO2–Pt, 0 ≤ x ≤ 1), which were fabricated via a simple water–glycol system.
Highly effective sites and selectivity of nitrogen-doped graphene/CNT catalysts for CO2 electrochemical reduction
The selectivity of CO2 electrochemical reduction can be tuned for N-doped graphene/CNT catalysts after active sites are determined.
Photocatalytic proton reduction with ruthenium and cobalt complexes immobilized on fumed reversed-phase silica
Non-covalent binding of water reduction catalysts and photosensitizers to hydrophobic silica particles represents a general approach for heterogenizing molecular water splitting components.
Discovery of low energy pathways to metal-mediated BN bond reduction guided by computation and experiment
The reduction of borazine-type heterocycles has been a challenge in the area of chemical hydrogen storage. Coordination to low valent metal carbonyls activates borazine for reduction by both 1 e− and 2 e− pathways.
Highly efficient, selective, and durable photocatalytic system for CO2 reduction to formic acid
Photocatalytic reduction of CO2 to formic acid with high efficiency, durability, and rate.
Solar-microbial hybrid device based on oxygen-deficient niobium pentoxide anodes for sustainable hydrogen production
A new solar-microbial hybrid device based on oxygen-deficient Nb2O5 anodes for sustainable hydrogen generation without external bias was demonstrated.
Galvanic replacement synthesis of AgxAu1−x@CeO2 (0 ≤ x ≤ 1) core@shell nanospheres with greatly enhanced catalytic performance
A galvanic replacement strategy has been successfully adopted to design AgxAu1−x@CeO2 core@shell nanospheres derived from Ag@CeO2 ones.
Pt/Ni(OH)2–NiOOH/Pd multi-walled hollow nanorod arrays as superior electrocatalysts for formic acid electrooxidation
In this work, novel Pt/Ni(OH)2–NiOOH/Pd multi-walled hollow nanorod arrays are successfully synthesized.
Overpotential for CO2 electroreduction lowered on strained penta-twinned Cu nanowires
Penta-twinned Cu nanowires have a strain-tunable low overpotential for CO2 electroreduction.
Photoelectrochemical device based on Mo-doped BiVO4 enables smart analysis of the global antioxidant capacity in food
An ultrasensitive Mo-doped BiVO4 composite was used to engineer a photoelectrochemical platform for the direct analysis of the global antioxidant capacity. Using this principle, an integrated device was successfully exploited for the “smart” monitoring of antioxidant-rich foodstuffs.
Carbon nitride–TiO2 hybrid modified with hydrogenase for visible light driven hydrogen production
Solar light driven hydrogen production with a heterogenised hydrogenase on a carbon nitride–TiO2 hybrid is reported that sets a new benchmark for photo-H2 production.
Possibility of designing catalysts beyond the traditional volcano curve: a theoretical framework for multi-phase surfaces
The current theory of catalyst activity in heterogeneous catalysis is mainly obtained from the study of catalysts with mono-phases, while most catalysts in real systems consist of multi-phases, the understanding of which is far short of chemists' expectation.
Self-assembly of a mesoporous ZnS/mediating interface/CdS heterostructure with enhanced visible-light hydrogen-production activity and excellent stability
We designed and successfully fabricated a ZnS/CdS 3D mesoporous heterostructure with a mediating Zn1−xCdxS interface.
Photoanodic and photocathodic behaviour of La5Ti2CuS5O7 electrodes in the water splitting reaction
La5Ti2CuS5O7 embedded into the surface of Au and Ti substrates shows a photocurrent attributable to HER and OER.
Unravelling the pH-dependence of a molecular photocatalytic system for hydrogen production
The electron-donating ability of the sacrificial agent and the protonation of the catalyst determine the optimum pH for hydrogen production.
Synthesis of open-mouthed, yolk–shell Au@AgPd nanoparticles with access to interior surfaces for enhanced electrocatalysis
Open-mouthed, yolk–shell Au@AgPd nanoparticles are successfully produced via galvanic replacement reaction in water at room temperature.
Ammonia decomposition catalysis using non-stoichiometric lithium imide
The non-stoichiometric lithium imide–amide system effectively decomposes ammonia to its constituents, hydrogen and nitrogen. Isotopic studies show that this bulk catalytic reaction has the potential to generate high-purity hydrogen for future energy and transport applications.
Chemical looping of metal nitride catalysts: low-pressure ammonia synthesis for energy storage
Design principles for reducible metal nitride catalysts are developed and demonstrated for ambient-pressure solar-driven N2 reduction into NH3.
The atomistic origin of the extraordinary oxygen reduction activity of Pt3Ni7 fuel cell catalysts
Optimality of Pt : Ni 30 : 70 fully dealloyed nanoporous Pt particles in terms of size and coordination environment.
Highly stable PtP alloy nanotube arrays as a catalyst for the oxygen reduction reaction in acidic medium
Self-supporting PtP nanotube arrays composed of interconnected PtP alloy nanocrystals exhibited excellent activity and durability for the ORR in acidic medium.
Increasing the rate of hydrogen oxidation without increasing the overpotential: a bio-inspired iron molecular electrocatalyst with an outer coordination sphere proton relay
H2 oxidation by a molecular electrocatalyst is dramatically improved by controlling proton movement from iron to the outer coordination sphere.
Electrode initiated proton-coupled electron transfer to promote degradation of a nickel(II) coordination complex
Electrochemical analysis of a nickel compound that degrades permitted a peek into the decomposition mechanism.
Enhancing H2 evolution performance of an immobilised cobalt catalyst by rational ligand design
Rational ligand design was employed to improve the proton reduction activity of an immobilised cobalt diimine–dioxime catalyst.
Turning it off! Disfavouring hydrogen evolution to enhance selectivity for CO production during homogeneous CO2 reduction by cobalt–terpyridine complexes
Understanding the activity and selectivity of molecular catalysts for CO2 reduction to fuels is an important scientific endeavour in addressing the growing global energy demand.
Rapid water oxidation electrocatalysis by a ruthenium complex of the tripodal ligand tris(2-pyridyl)phosphine oxide
A ruthenium complex of the tripodal ligand tris(2-pyridyl)phosphine oxide exhibits rapid water oxidation electrocatalysis over a wide pH range.
What is the trigger mechanism for the reversal of electron flow in oxygen-tolerant [NiFe] hydrogenases?
A new mechanistic model is developed for the sequence of events by which oxygen-tolerant [NiFe] hydrogenase enzymes respond to O2.
Durable hydrogen evolution from water driven by sunlight using (Ag,Cu)GaSe2 photocathodes modified with CdS and CuGa3Se5
The multilayer structure enhances the hydrogen evolution from water under simulated sunlight.
Oxygen evolution on well-characterized mass-selected Ru and RuO2 nanoparticles
Well-defined mass-selected Ru and RuO2 nanoparticles exhibit an order of magnitude improvement in the oxygen evolution activity, relative to the state-of-the-art, with a maximum at around 3–5 nm.
About this collection
We are delighted to present an online collection showcasing recently published articles in the field of energy. To address major issues facing our planet, researchers all over the world have increasingly focused their efforts on finding solutions to these energy challenges. These articles highlight some of the excellent work that tackles important global challenges related to energy. We hope you enjoy reading this collection!