Greatly Facilitated Two-Electron Electroreduction of Oxygen into Hydrogen Peroxide over TiO2 by Mn Doping

• DOI: 10.1021/acsami.1c13307
• Publication Date: 2021-09-27T21:31:59Z
• Authors: Quanying Chen; Chaoqun Ma; Shihai Yan; Jie Liang; Kai Dong; Yonglan Luo; Qian Liu; Tingshuai Li; Yan Wang; Luchao Yue; Baozhan Zheng; Yang Liu; Shuyan Gao; Zhenju Jiang; Wei Li; Xuping Sun
• Keywords: 0103 physical sciences; 02 engineering and technology; 0210 nano-technology; 01 natural sciences; 7. Clean energy; 0104 chemical sciences

Ambient electrochemical oxygen reduction into valuable hydrogen peroxide (H2O2) via a selective two-electron (2e–) pathway is regarded as sustainable alternative to the industrial anthraquinone process, but it requires advanced electrocatalysts with high activity and selectivity. In this study, we report that Mn-doped TiO2 behaves an efficient electrocatalyst toward highly H2O2 synthesis. This catalyst exhibits markedly enhanced 2e– reaction performance low onset potential of 0.78 V selectivity 92.7%, much superior pristine (0.64 V, 62.2%). Additionally, demonstrates improved yield up 205 ppm h–1 good stability during bulk electrolysis in H-cell device. The significantly boosted catalytic ascribed lattice distortion large amount vacancies Ti3+. Density functional theory calculations reveal Mn dopant improves electrical conductivity reduces ΔG*OOH TiO2, thus giving rise production process.