Hydrovoltaic effect-enhanced photocatalysis by polyacrylic acid/cobaltous oxide–nitrogen doped carbon system for efficient photocatalytic water splitting

Xu Xin, Youzi Zhang, Ruiling Wang, Yijin Wang, Peng Guo and Xuanhua Li ()
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Xu Xin: Northwestern Polytechnical University
Youzi Zhang: Northwestern Polytechnical University
Ruiling Wang: Northwestern Polytechnical University
Yijin Wang: Northwestern Polytechnical University
Peng Guo: Northwestern Polytechnical University
Xuanhua Li: Northwestern Polytechnical University

Nature Communications, 2023, vol. 14, issue 1, 1-9

Abstract: Abstract Severe carrier recombination and the slow kinetics of water splitting for photocatalysts hamper their efficient application. Herein, we propose a hydrovoltaic effect-enhanced photocatalytic system in which polyacrylic acid (PAA) and cobaltous oxide (CoO)–nitrogen doped carbon (NC) achieve an enhanced hydrovoltaic effect and CoO–NC acts as a photocatalyst to generate H2 and H2O2 products simultaneously. In this system, called PAA/CoO–NC, the Schottky barrier height between CoO and the NC interface decreases by 33% due to the hydrovoltaic effect. Moreover, the hydrovoltaic effect induced by H+ carrier diffusion in the system generates a strong interaction between H+ ions and the reaction centers of PAA/CoO–NC, improving the kinetics of water splitting in electron transport and species reaction. PAA/CoO–NC exhibits excellent photocatalytic performance, with H2 and H2O2 production rates of 48.4 and 20.4 mmol g−1 h−1, respectively, paving a new way for efficient photocatalyst system construction.

Date: 2023
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DOI: 10.1038/s41467-023-37366-3

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