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However, developing low\u2010cost electrocatalysts that exhibit high selectivity and efficiency for both CO<jats:sub>2<\/jats:sub>R and SOR remains a challenge. Herein, a bifunctional copper selenide catalyst is developed with copper vacancies (v\u2010CuSe<jats:sub>2<\/jats:sub>) for the CO<jats:sub>2<\/jats:sub>R\u2010SOR. The Faradaic efficiency (FE) of 62.4% for methane at \u2212200\u00a0mA cm<jats:sup>\u22122<\/jats:sup> is achieved in the cathodic CO<jats:sub>2<\/jats:sub>R. In a two\u2010electrode CO<jats:sub>2<\/jats:sub>R\u2010SOR system with 16 h of long\u2010term operation at a current density of 200\u00a0mA\u00a0cm<jats:sup>\u22122<\/jats:sup>, an average Faradaic efficiency of 57.2% for methane and 97.7% for sulfur powder generation is achieved at cathode and anode, respectively. Compared to the coupling of CO<jats:sub>2<\/jats:sub>R with oxygen evolution reaction (OER), the energy efficiency (EE) of the CO<jats:sub>2<\/jats:sub>R\u2010SOR system can be increased to 22.9%. The mechanism study has found that the synergistic effect of copper vacancies and introduced Se significantly enhances the selectivity toward methane. Driven by silicon solar cells, a solar\u2010to\u2010methane conversion efficiency of 2% is achieved.<\/jats:p>","DOI":"10.1002\/smll.202411269","type":"journal-article","created":{"date-parts":[[2024,12,23]],"date-time":"2024-12-23T10:59:29Z","timestamp":1734951569000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Solar\u2010Driven Sulfide Oxidation Paired With CO<sub>2<\/sub> Reduction Based on Vacancies Engineering of Copper Selenide"],"prefix":"10.1002","volume":"21","author":[{"given":"Zhongke","family":"Wang","sequence":"first","affiliation":[{"name":"Institute of Photoelectronic Thin Film Devices and Technology Renewable Energy Conversion and Storage Center State Key Laboratory of Photovoltaic Materials and Cells Nankai University  Tianjin 300350 P. R. 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