期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 650, 期 -, 页码 284-293出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2023.06.203
关键词
Photoelectrocatalytic; Hydrogen evolution reaction; Internal electric field; Charge separation
A highly efficient Cu2O/MoO2 photocathode was successfully prepared via in-situ electrodeposition. The study demonstrated that MoO2 not only passivated the surface state of Cu2O and accelerated reaction kinetics as a cocatalyst, but also promoted the migration and separation of photogenerated charge. Furthermore, MoO2 exhibited excellent photoelectrochemical stability by inhibiting the reduction of Cu+ in Cu2O and forming an internal electric field.
Photoelectrocatalyzing water reduction is a potential approach to building a green and sustainable society. As a benchmark photocathode, Cu2O receives much attention but faces serious charge recombination and photocorrosion. This work prepared an excellent Cu2O/MoO2 photocathode via in situ electrodeposition. A systematical study of theory and experiment demonstrates that MoO2 not only effectively passivates the surface state of Cu2O as well as accelerates reaction kinetics as a cocatalyst, but also promotes the directional migration and separation of photogenerated charge. As expected, the constructed photocathode exhibits a highly enhanced photocurrent density and an appealing energy transformation efficacy. Importantly, MoO2 can inhibit the reduction of Cu+ in Cu2O via a formed internal electric field and shows excellent photoelectrochemical stability. These findings pave the way to designing a high-activity photocathode with high stability.
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