Jump to main content
Jump to site search


Branched Polymer-incorporated Multi-layered Heterostructured Photoanode: Precisely Tuning Directional Charge Transfer Toward Solar Water Oxidation

Abstract

Unidirectional and smooth charge transfer to the reactive sites plays an imperative role in boosting the solar-to-hydrogen conversion efficiency of photoelectrochemical (PEC) cell but suffers from sluggish charge transfer kinetic.Herein, as a proof-of-concept demonstration, high-speed spatially separated electron and hole transfer channels were simultaneously constructed in an integrated multilayered heterostructured photoanodes via an efficient electrostatic layer-by-layer (LbL) assembly strategy, wherein tailor-made positively charged polymer of branched poly-ethylenimine (BPEI) and negatively charged MoS2 quantum dots (QDs) building blocks were intimately and alternately integrated on the hierarchically ordered TiO2 nanotube arrays (TNTAs) framework in a unique “face-to-face” stacking fashion. The periodically alternately stacked ultra-thin BPEI layer in the ternary multilayered photoanode serves as directional hole transport channel and MoS2 QDs layer functions as cascade electron transfer channel, which synergistically contribute to the considerably enhanced separation and prolonged lifetime of charge carriers, endowing the multilayered TNTAs/(BPEI-MoS2 QDs)n photoanodes with markedly enhanced PEC water dissociation performances with respect to the single and binary counterparts under simulated solar light irradiation. Moreover, essential role of the assembly unit was clarified. Our work would afford a new frontier to intelligently mediate the photoinduced charge flow by rationally constructing the unidirectional charge transport channels in semiconductor-based photoelectrodes for solar energy conversion.

Back to tab navigation

Supplementary files

Publication details

The article was received on 21 Oct 2019, accepted on 27 Nov 2019 and first published on 27 Nov 2019


Article type: Paper
DOI: 10.1039/C9TA11579J
J. Mater. Chem. A, 2019, Accepted Manuscript

  •   Request permissions

    Branched Polymer-incorporated Multi-layered Heterostructured Photoanode: Precisely Tuning Directional Charge Transfer Toward Solar Water Oxidation

    Z. Wei, X. Dai, S. Hou, Y. Li, M. Huang, T. Li, S. Xu and F. Xiao, J. Mater. Chem. A, 2019, Accepted Manuscript , DOI: 10.1039/C9TA11579J

Search articles by author

Spotlight

Advertisements