Polymeric viologen-based electron transfer mediator for improving the photoelectrochemical water splitting on Sb_(2)Se_(3) photocathode  

作　　者：Chang Liu Fusheng Li Linqin Wang Zeju Li Yilong Zhao Yingzheng Li Wenlong Li Ziqi Zhao Ke Fan Fei Li Licheng Sun 

机构地区：[1]State Key Laboratory of Fine Chemicals,Institute of Artificial Photosynthesis,DUT-KTH Joint Education and Research Centre on Molecular Devices,Institute for Energy Science and Technology,Dalian University of Technology,Dalian 116024,China [2]Center of Artificial Photosynthesis for Solar Fuels,School of Science,Westlake University,Hangzhou 310024,China [3]Department of Chemistry,School of Engineering Sciences in Chemistry,Biotechnology and Health,KTH Royal Institute of Technology,Stockholm 10044,Sweden

出　　处：《Fundamental Research》2024年第2期291-299,共9页自然科学基础研究（英文版）

基　　金：conducted by the Fundamental Research Center of Artificial Photosynthesis(FReCAP);financially supported by the National Natural Science Foundation of China(NSFC)(22172011 and 22088102);the K&A Wallenberg Foundation(KAW 2016.0072);Key Laboratory of Bio-based Chemicals of Liaoning Province of China;Zhejiang Province Selected Funding for Postdoctoral Research Projects(ZJ2021001)for financial support.

摘　　要：The photogenerated charge carrier separation and transportation of inside photocathodes can greatly influence the performance of photoelectrochemical(PEC)H2 production devices.Coupling TiO_(2) with p-type semiconductors to construct heterojunction structures is one of the most widely used strategies to facilitate charge separation and transportation.However,the band position of TiO_(2) could not perfectly match with all p-type semiconductors.Here,taking antimony selenide(Sb_(2)Se_(3))as an example,a rational strategy was developed by introducing a viologen electron transfer mediator(ETM)containing polymeric film(poly-1,1′-dially-[4,4′-bipyridine]-1,1′-diium,denoted as PV^(2+))at the interface between Sb_(2)Se_(3) and TiO_(2) to regulate the energy band alignment,which could inhibit the recombination of photogenerated charge carriers of interfaces.With Pt as a catalyst,the constructed Sb_(2)Se_(3)/PV^(2+)/TiO_(2)/Pt photocathode showed a superior PEC hydrogen generation activity with a photocurrent density of−18.6 mA cm^(-2) vs.a reversible hydrogen electrode(RHE)and a half-cell solar-to-hydrogen efficiency(HC-STH)of 1.54%at 0.17 V vs.RHE,which was much better than that of the related Sb_(2)Se_(3)/TiO_(2)/Pt photocathode without PV^(2+)(−9.8 mA cm^(-2),0.51%at 0.10 V vs.RHE).

关 键 词：VIOLOGEN Electron transfer mediator Sb2Se3 photocathode Solar water splitting Hydrogen evolution reaction 

分 类 号：O646[理学—物理化学]