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- Title
Atomically dispersed asymmetric cobalt electrocatalyst for efficient hydrogen peroxide production in neutral media.
- Authors
Liu, Longxiang; Kang, Liqun; Feng, Jianrui; Hopkinson, David G.; Allen, Christopher S.; Tan, Yeshu; Gu, Hao; Mikulska, Iuliia; Celorrio, Veronica; Gianolio, Diego; Wang, Tianlei; Zhang, Liquan; Li, Kaiqi; Zhang, Jichao; Zhu, Jiexin; Held, Georg; Ferrer, Pilar; Grinter, David; Callison, June; Wilding, Martin
- Abstract
Electrochemical hydrogen peroxide (H2O2) production (EHPP) via a two-electron oxygen reduction reaction (2e- ORR) provides a promising alternative to replace the energy-intensive anthraquinone process. M-N-C electrocatalysts, which consist of atomically dispersed transition metals and nitrogen-doped carbon, have demonstrated considerable EHPP efficiency. However, their full potential, particularly regarding the correlation between structural configurations and performances in neutral media, remains underexplored. Herein, a series of ultralow metal-loading M-N-C electrocatalysts are synthesized and investigated for the EHPP process in the neutral electrolyte. CoNCB material with the asymmetric Co-C/N/O configuration exhibits the highest EHPP activity and selectivity among various as-prepared M-N-C electrocatalyst, with an outstanding mass activity (6.1 × 105 A gCo−1 at 0.5 V vs. RHE), and a high practical H2O2 production rate (4.72 mol gcatalyst−1 h−1 cm−2). Compared with the popularly recognized square-planar symmetric Co-N4 configuration, the superiority of asymmetric Co-C/N/O configurations is elucidated by X-ray absorption fine structure spectroscopy analysis and computational studies. The relationship between the structural configurations of M-N-C electrocatalysts and their performances in neutral environments has been insufficiently investigated. Here the authors demonstrate that an ultralow metal-loaded Co-N-C electrocatalyst, featuring the asymmetric Co-C/N/O configuration, exhibit exceptional efficiency in electrochemically producing hydrogen peroxide under neutral conditions.
- Subjects
HYDROGEN peroxide; OXYGEN reduction; X-ray absorption; TRANSITION metals; COBALT; ELECTROCATALYSTS; X-ray absorption near edge structure; ANTHRAQUINONES; HYDROGEN production
- Publication
Nature Communications, 2024, Vol 15, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-024-48209-0