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Instruments / Technical Area	Publication Details	Published	Actions
B07-B1-Versatile Soft X-ray beamline: High Throughput ES1 B18-Core EXAFS E02-JEM ARM 300CF	Atomically dispersed asymmetric cobalt electrocatalyst for efficient hydrogen peroxide production in neutral media Longxiang Liu , Liqun Kang , Jianrui Feng , David G. Hopkinson , Christopher S. Allen , Yeshu Tan , Hao Gu , Iuliia Mikulska , Veronica Celorrio , Diego Gianolio , Tianlei Wang , Liquan Zhang , Kaiqi Li , Jichao Zhang , Jiexin Zhu , Georg Held , Pilar Ferrer , David Grinter , June Callison , Martin Wilding , Sining Chen , Ivan Parkin , Guanjie He Nature Communications 15 DOI: 10.1038/s41467-024-48209-0 Diamond Proposal Number(s): [30614, 32058, 32035, 32117, 33466, 29271] Open Access Show Abstract ▼ 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.	May 2024

Instruments / Technical Area

Publication Details

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B07-B1-Versatile Soft X-ray beamline: High Throughput ES1
B18-Core EXAFS
E02-JEM ARM 300CF

Atomically dispersed asymmetric cobalt electrocatalyst for efficient hydrogen peroxide production in neutral media