文献类型：期刊文献

英文题名：Stable Unbiased Photo-Electrochemical Overall Water Splitting Exceeding 3% Efficiency via Covalent Triazine Framework/Metal Oxide Hybrid Photoelectrodes

作者：Zhang, Ying[1];Lv, Haifeng[2];Zhang, Zhen[3];Wang, Lei[1];Wu, Xiaojun[2];Xu, Hangxun[1]

机构：[1]Univ Sci & Technol China, Dept Polymer Sci & Engn, CAS Key Lab Soft Matter Chem, Hefei Natl Lab Phys Sci Microscale, Hefei 230026, Anhui, Peoples R China;[2]Univ Sci & Technol China, CAS Key Lab Mat Energy Convers, Dept Mat Sci & Engn, CAS Ctr Excellence Nanosci,Hefei Natl Lab Phys Sc, Hefei 230026, Anhui, Peoples R China;[3]East China Univ Sci & Technol, Sch Sci, Shanghai 200237, Peoples R China

年份：2021

卷号：33

期号：15

外文期刊名：ADVANCED MATERIALS

收录：;EI(收录号：20211110069693);WOS:【SCI-EXPANDED(收录号:WOS:000626647000001)】；

基金：Y.Z. and H.L. contributed equally to this work. This work was partially carried out at the USTC Center for Micro- and Nanoscale Research and Fabrication. The synchrotron radiation photoemission spectroscopy and X-ray absorption near edge spectroscopy were performed at the Photoemission Endstation (BL10B) in the National Synchrotron Radiation Laboratory. The in situ DRIFTS characterization was carried out at the Infrared Spectroscopy and Microspectroscopy Endstation (BL01B) in the National Synchrotron Radiation Laboratory. This work was supported by the National Key R&D Program of China (2017YFA0207301), National Natural Science Foundation of China (21875235), the China Postdoctoral Science Foundation (2019M662160, BX20200317), the Fundamental Research Funds for the Central Universities, and the Super Computer Centre of USTCSCC and SCCAS.

语种：英文

外文关键词：covalent triazine frameworks; heterojunctions; photo‐ electrochemical cells; surface protection; water splitting

摘要：Photo-electrochemical (PEC) water splitting systems using oxide-based photoelectrodes are highly attractive for solar-to-chemical energy conversion. However, despite decades-long efforts, it is still challenging to develop efficient and stable photoelectrodes for practical applications. Here, thin layers of covalent triazine frameworks (CTF-BTh) containing a bithiophene moiety are conformably deposited onto the surfaces of a Cu2O photocathode and a Mo-doped BiVO4 photoanode via electropolymerization to construct new hybrid photoelectrodes, successfully addressing the efficiency and stability issues. The CTF-BTh possesses a suitable band structure to form favorable band edge alignment with each metal oxide, creating a p-n junction and a staggered type-II heterojunction with Cu2O and Mo-doped BiVO4, respectively. Thus, the as-fabricated hybrid photoelectrodes exhibit substantially increased PEC performances. Meanwhile, the CTF-BTh film also serves as an effective corrosion-resistant overlayer for both photoelectrodes to inhibit photocorrosion and enable long-term operation for 150 h with only approximate to 10% loss in photocurrent densities. Furthermore, a stand-alone unbiased PEC tandem device comprising CTF-BTh-coated photoelectrodes exhibits 3.70% solar-to-hydrogen conversion efficiency. Even after continuous operation for 120 h, the efficiency can still retain at 3.24%.