In:
Journal of Materials Chemistry A, Royal Society of Chemistry (RSC), Vol. 11, No. 29 ( 2023), p. 15833-15843
Abstract:
Photoelectrochemical (PEC) water splitting is a promising approach for the conversion of solar energy to hydrogen fuel. However, the solar-to-hydrogen (STH) efficiency is still restricted by the kinetically sluggish oxidation reaction on the surface of the photoanode. Herein, a unique composite structure (ZnO@NiO–QDs) was developed as the photoanode, in which the highly dispersed ZnO (d-ZnO) particles derived from the pyrolysis of ZIF-8 serve as the scaffolds to support NiO (cocatalysts) and colloidal CdSe(CdSe x S 1− x ) 4 (CdS) 2 QDs (denoted as CAS, a light absorber). Due to the enhanced hole consumption accelerated by NiO cocatalysts, the optimized photoanode (d-ZnO@NiO 0.03 –CAS) exhibits a higher saturated current density ( J sc ) of 21.7 mA cm −2 than the d-ZnO–CAS photoanode (15.6 mA cm −2 ) under standard one sun (AM 1.5 G, 100 mW cm −2 ) solar irradiation. More importantly, such an electrode can still work as an electrocatalyst under light-off conditions via a sole electrochemical (EC) process. Thus, a well-designed bifunctional electrode that integrates cocatalysts and light absorbers makes it possible to generate hydrogen efficiently under both light-on and light-off conditions, providing an efficient and low-cost paradigm to improve the hydrogen evolution performance.
Type of Medium:
Online Resource
ISSN:
2050-7488
,
2050-7496
Language:
English
Publisher:
Royal Society of Chemistry (RSC)
Publication Date:
2023
detail.hit.zdb_id:
2702232-8
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