期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 652, 期 -, 页码 1467-1480出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2023.08.144
关键词
Heterojunctions; DFT; Hydrogen Generation; Photocatalysis; Electrocatalysis
This article reports on a novel Cu2O/g-C3N4 heterostructure that exhibits both photocatalytic and electrocatalytic functions for water splitting. The heterostructure shows lower overpotential and higher photocatalytic hydrogen evolution compared to g-C3N4, thanks to increased catalytically active sites and reduced charge transfer resistance.
One of the most efficient ways for the photogenerated charge carriers is by the development of heterojunction between p-type and n-type semiconductors, which creates an interfacial charge transfer between two semiconductors. By enhancing the bifunctional characteristics for hydrogen generation via photocatalytic and electrocatalytic water splitting reaction, we report the type-II Cu2O/g-C3N4 heterostructure in this article. Due to significantly increased catalytically active sites for the hydrogen evolution reaction (HER) reaction during electrocatalysis and decreased charge transfer resistance, the as-prepared heterostructure exhibits a lower overpotential of 47 and 72 mVdec-1 for the HER and oxygen evolution reactions (OER), respectively, when compared to alone g-C3N4. In addition, Cu2O/g-C3N4 heterostructures have a higher photocatalytic hydrogen evolution of 3492 & mu;mol g cat1 in the presence of Triethanolamine as a sacrificial agent, which is nearly 2-fold times greater than g-C3N4 (1818 & mu;mol g cat1) after 5 h of continuous light-irradiation. Moreover, produced heterostructure exhibits 81% of Faradaic efficiency and 18% of apparent quantum yield. This work successfully explains how the rise in water splitting is induced by the transfer of photogenerated electrons in a cascade way from p-type Cu2O to the n-type g-C3N4 using density functional theory (DFT) calculations.
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