A CuGaO₂ p-type semiconductor electrode was successfully employed for constructing a new hybrid photocathode with a Ru(II)–Re(I) supramolecular photocatalyst (RuRe/CuGaO₂). The RuRe/CuGaO₂ photocathode displayed photoelectrochemical activity for the conversion of CO₂ to CO in an aqueous electrolyte solution with a positive onset potential of +0.3 V vs. Ag/AgCl, which is 0.4 V more positive in comparison to a previously reported hybrid photocathode that used a NiO electrode instead of CuGaO₂. A photoelectrochemical cell comprising this RuRe/CuGaO₂ photocathode and a CoO_x/TaON photoanode enabled the visible-light-driven catalytic reduction of CO₂ using water as a reductant to give CO and O₂ without applying any external bias. This is the first self-driven photoelectrochemical cell constructed with the molecular photocatalyst to achieve the reduction of CO₂ by only using visible light as the energy source and water as a reductant.

中文翻译：

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由CuGaO ₂ p型半导体和Ru（II）-Re（I）超分子光催化剂组成的混合光电阴极：无偏可见光驱动的CO ₂用水氧化还原

CuGaO ₂ p型半导体电极已成功用于构建具有Ru（II）-Re（I）超分子光催化剂（RuRe / CuGaO ₂）的新型杂化光阴极。所述RuRe / CuGaO ₂光电显示光电化学活性CO的转化₂与0.3 V的正开始电位电解质水溶液对CO与银/氯化银，这是0.4 [V]相比于先前报道的混合更积极使用NiO电极代替CuGaO _2的光电阴极。包含该RuRe / CuGaO的光电化学电池_2个光电阴极和一个CoO _x / TaON光电阳极能够在不施加任何外部偏压的情况下使用水作为还原剂，进行可见光驱动的CO ₂催化还原，从而生成CO和O ₂。这是第一个使用分子光催化剂构造的自驱动光电化学电池，仅通过使用可见光作为能源，而水作为还原剂来实现CO ₂的还原。