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Instruments / Technical Area	Publication Details	Published	Actions
B07-B1-Versatile Soft X-ray beamline: High Throughput ES1 E02-JEM ARM 300CF	Spectroscopic identification of active sites of oxygen-doped carbon for selective oxygen reduction to hydrogen peroxide Longxiang Liu , Liqun Kang , Arunabhiram Chutia , Jianrui Feng , Martyna Michalska , Pilar Ferrer , David Grinter , Georg Held , Yeshu Tan , Fangjia Zhao , Fei Guo , David Hopkinson , Christopher Allen , Yanbei Hou , Junwen Gu , Ioannis Papakonstantinou , Paul Shearing , Dan Brett , Ivan P. Parkin , Guanjie He Angewandte Chemie International Edition DOI: 10.1002/anie.202303525 Diamond Proposal Number(s): [29340, 32501, 30614, 29809, 32058] Open Access Show Abstract ▼ Abstract: The electrochemical synthesis of hydrogen peroxide (H2O2) via a two-electron (2e-) oxygen reduction reaction (ORR) process provides a promising alternative to replace the energy-intensive anthraquinone process. However, the development of efficient electrocatalysts is still facing lots of challenges like insufficient understanding of active sites. Herein, we develop a facile template-protected strategy to synthesize a highly active quinone-rich porous carbon catalyst (PCC) for H2O2 electrochemical production. The optimized PCC900 exhibits unprecedented activity and selectivity, of which the onset potential reaches 0.83 V vs. reversible hydrogen electrode in 0.1 M KOH and the H2O2 selectivity is over 95 % in a wide potential range. Comprehensive synchrotron-based near-edge X-ray absorption fine structure (NEXAFS) spectroscopy combined with electrocatalytic characterizations reveals the positive correlation between quinone content and 2e- ORR performance. The effectiveness of chair-form quinone groups as the most efficient active sites is highlighted by the molecule-mimic strategy and theoretical analysis.	Mar 2023

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

Spectroscopic identification of active sites of oxygen-doped carbon for selective oxygen reduction to hydrogen peroxide