Anomalous self-optimization of sulfate ions for boosted oxygen evolution reaction.

Autor: Cao D; National Synchrotron Radiation Laboratory, CAS Center for Excellence in Nanoscience, University of Science and Technology of China, Hefei 230026, China., Moses OA; National Synchrotron Radiation Laboratory, CAS Center for Excellence in Nanoscience, University of Science and Technology of China, Hefei 230026, China., Sheng B; National Synchrotron Radiation Laboratory, CAS Center for Excellence in Nanoscience, University of Science and Technology of China, Hefei 230026, China., Chen S; National Synchrotron Radiation Laboratory, CAS Center for Excellence in Nanoscience, University of Science and Technology of China, Hefei 230026, China. Electronic address: csmp@ustc.edu.cn., Pan H; National Synchrotron Radiation Laboratory, CAS Center for Excellence in Nanoscience, University of Science and Technology of China, Hefei 230026, China., Wu L; National Synchrotron Radiation Laboratory, CAS Center for Excellence in Nanoscience, University of Science and Technology of China, Hefei 230026, China., Shou H; National Synchrotron Radiation Laboratory, CAS Center for Excellence in Nanoscience, University of Science and Technology of China, Hefei 230026, China; Hefei National Laboratory for Physical Sciences at the Microscales, Department of Materials Sciences and Engineering, University of Science and Technology of China, Hefei 230026, China., Xu W; National Synchrotron Radiation Laboratory, CAS Center for Excellence in Nanoscience, University of Science and Technology of China, Hefei 230026, China., Li D; Institute of Amorphous Matter Science, School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China., Zheng L; Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China., Chu S; Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China., Hu C; National Synchrotron Radiation Laboratory, CAS Center for Excellence in Nanoscience, University of Science and Technology of China, Hefei 230026, China., Liu D; National Synchrotron Radiation Laboratory, CAS Center for Excellence in Nanoscience, University of Science and Technology of China, Hefei 230026, China; School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798, Singapore., Wei S; National Synchrotron Radiation Laboratory, CAS Center for Excellence in Nanoscience, University of Science and Technology of China, Hefei 230026, China., Zheng X; National Synchrotron Radiation Laboratory, CAS Center for Excellence in Nanoscience, University of Science and Technology of China, Hefei 230026, China., Qi Z; National Synchrotron Radiation Laboratory, CAS Center for Excellence in Nanoscience, University of Science and Technology of China, Hefei 230026, China., Wu X; Hefei National Laboratory for Physical Sciences at the Microscales, Department of Materials Sciences and Engineering, University of Science and Technology of China, Hefei 230026, China., Zhang J; Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China., Song L; National Synchrotron Radiation Laboratory, CAS Center for Excellence in Nanoscience, University of Science and Technology of China, Hefei 230026, China. Electronic address: song2012@ustc.edu.cn.
Jazyk: angličtina
Zdroj: Science bulletin [Sci Bull (Beijing)] 2021 Mar 30; Vol. 66 (6), pp. 553-561. Date of Electronic Publication: 2020 Sep 30.
DOI: 10.1016/j.scib.2020.09.037
Abstrakt: Broadly, the oxygen evolution reaction (OER) has been deeply understood as a significant part of energy conversion and storage. Nevertheless, the anions in the OER catalysts have been neglected for various reasons such as inactive sites, dissolution, and oxidation, amongst others. Herein, we applied a model catalyst s-Ni(OH) 2 to track the anionic behavior in the catalyst during the electrochemical process to fill this gap. The advanced operando synchrotron radiation Fourier transform infrared (SR-FTIR) spectroscopy, synchrotron radiation photoelectron spectroscopy (SRPES) depth detection and differential X-ray absorption fine structure (Δ-XAFS) spectrum jointly point out that some oxidized sulfur species (SO 4 2- ) will self-optimize new Ni-S bonds during OER process. Such amazing anionic self-optimization (ASO) behavior has never been observed in the OER process. Subsequently, the optimization-derived component shows a significantly improved electrocatalytic performance (activity, stability, etc.) compared to reference catalyst Ni(OH) 2 . Theoretical calculation further suggests that the ASO process indeed derives a thermodynamically stable structure of the OER catalyst, and then gives its superb catalytic performance by optimizing the thermodynamic and kinetic processes in the OER, respectively. This work demonstrates the vital role of anions in the electrochemical process, which will open up new perspectives for understanding OER and provide some new ideas in related fields (especially catalysis and chemistry).
Competing Interests: Conflict of interest The authors declare that they have no conflict of interest.
(Copyright © 2020 Science China Press. Published by Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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