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Enhanced Photoelectrochemical Performance of WO 3 ‐Based Composite Photoanode Coupled with Carbon Quantum Dots and NiFe Layered Double Hydroxide
Author(s) -
Cao Xiaohu,
Xu Chunjiang,
Ma Jiarui,
Dong Yinjuan,
Dong Congzhao,
Yue Meie,
Ding Yong
Publication year - 2019
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201901803
Subject(s) - photocurrent , hydroxide , materials science , electrolyte , composite number , quantum dot , chemical engineering , electrode , nanotechnology , carbon fibers , kinetics , band gap , optoelectronics , chemistry , composite material , physics , quantum mechanics , engineering
An attractive photoanode material, WO 3 , has suffered from its limited visible‐light absorption and sluggish surface reaction kinetics, as well as poor stability in neutral electrolytes. Herein, a NiFe/CQD/WO 3 composite photoanode was designed and fabricated, with loading of carbon quantum dots (CQDs) and electrodeposition of NiFe layered double hydroxide. The NiFe/CQD/WO 3 photoanode obtained a photocurrent density of 1.43 mA cm −2 at 1.23 V vs. reversible hydrogen electrode, which is approximately three times higher than that of bare WO 3 . During the test period of 3 h, the stability of WO 3 was improved substantially after the loading of cocatalysts. Furthermore, mechanistic insights of the favored band structure and beneficial charge‐transfer pathway elucidate the high photoelectrochemical performance of the NiFe/CQD/WO 3 composite photoanode.