期刊
ADVANCED MATERIALS
卷 33, 期 15, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202008264
关键词
covalent triazine frameworks; heterojunctions; photo‐ electrochemical cells; surface protection; water splitting
类别
资金
- National Key R&D Program of China [2017YFA0207301]
- National Natural Science Foundation of China [21875235]
- China Postdoctoral Science Foundation [2019M662160, BX20200317]
- Fundamental Research Funds for the Central Universities
- Super Computer Centre of USTCSCC
- Super Computer Centre of SCCAS
A new hybrid photoelectrode using CTF-BTh film has been developed to address efficiency and stability issues in PEC systems, significantly improving solar-to-chemical energy conversion performance. This innovative approach also demonstrates effective corrosion resistance and long-term operation capabilities, achieving promising solar-to-hydrogen conversion efficiency.
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%.
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