Enhancing the Visible Light Photoelectrochemical Water Splitting of TiO2 Photoanode via a p–n Heterojunction and the Plasmonic Effect
Developing visible light-responding photoelectrocatalysts with higher efficiency is highly demanded and broadly concerned in terms of photoelectrochemical (PEC) water splitting. Here, we report that by constructing a TiO2/CuInS2 p–n junction and further decorating it with plasmonic Cu nanoparticles,...
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Published in | Journal of physical chemistry. C Vol. 126; no. 28; pp. 11510 - 11517 |
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Main Authors | , , , , , |
Format | Journal Article |
Language | English |
Published |
American Chemical Society
21.07.2022
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Subjects | |
Online Access | Get full text |
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Summary: | Developing visible light-responding photoelectrocatalysts with higher efficiency is highly demanded and broadly concerned in terms of photoelectrochemical (PEC) water splitting. Here, we report that by constructing a TiO2/CuInS2 p–n junction and further decorating it with plasmonic Cu nanoparticles, the synthesized TiO2/CuInS2/Cu photoanodes show significantly enhanced visible light absorption and higher photoelectrocatalysis efficiency, benefiting from the joint influence of the built-in electric field and surface plasmonic resonance (SPR). Under >420 nm light irradiation, the photocurrent density is 2.36 mA/cm2 at 1.23 V vs reversible hydrogen electrode (RHE), enhanced by about 10 times than that of pure TiO2. Furthermore, the hydrogen production rate was enhanced from an undetectable level to 4.552 μmol/cm2/h. Our results exhibit that the strategy of a double-layer co-catalyst has promising applications in water splitting and other solar energy-conversion areas. |
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ISSN: | 1932-7447 1932-7455 |
DOI: | 10.1021/acs.jpcc.2c02798 |