Deng Danni, Wang Yuchao, Jiang Jiabi, Bai Yu, Chen Yingbi, Zheng Haitao, Ou Houzheng, Lei Yongpeng
State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China.
Chem Commun (Camb). 2024 Aug 27;60(70):9364-9367. doi: 10.1039/d4cc03361b.
Oxygen reduction reaction the two-electron pathway (2e ORR) offers a sustainable opportunity for hydrogen peroxide (HO) production, but suffers from low selectivity. In this work, indium oxide with oxygen vacancies (InO) exhibits a HO selectivity close to 98% at 0.6 V RHE. Further, a Faradaic efficiency (FE) of around 95% at 0.4-0.6 V RHE and a HO productivity of 3.7 mol h are reached in a flow cell. Raman spectra indicate that InO promotes the adsorption and activation of O and stabilizes oxygen intermediates. This work provides an insight into improving HO selectivity for 2e ORR catalysts.
氧还原反应的双电子途径（2e ORR）为过氧化氢（H₂O₂）的生产提供了一个可持续的机会，但选择性较低。在这项工作中，具有氧空位的氧化铟（In₂O₃）在0.6 V（相对于可逆氢电极，RHE）时表现出接近98%的H₂O₂选择性。此外，在流动池中，在0.4 - 0.6 V（相对于RHE）时达到了约95%的法拉第效率（FE）和3.7 mol h⁻¹的H₂O₂产率。拉曼光谱表明，In₂O₃促进了O的吸附和活化，并稳定了氧中间体。这项工作为提高2e ORR催化剂的H₂O₂选择性提供了见解。
