教師資料查詢 | 類別: 期刊論文 | 教師: 董崇禮 CHUNG-LI DONG (瀏覽個人網頁)

標題:Probing the active site in single-atom oxygen reduction catalysts via operando X-ray and electrochemical spectroscopy
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學期
出版(發表)日期2020/08/25
作品名稱Probing the active site in single-atom oxygen reduction catalysts via operando X-ray and electrochemical spectroscopy
作品名稱(其他語言)
著者H. T. Lien; S. T. Chang; P. T. Chen; D. P. Wong; Y. C. Chang; Y. R. Lu; C. L. Dong; C. H. Wang; K. H. Chen; L. C. Chen
單位
出版者
著錄名稱、卷期、頁數Nature Communications 11, 4233 (8 pages)
摘要Nonnoble metal catalysts are low-cost alternatives to Pt for the oxygen reduction reactions (ORRs), which have been studied for various applications in electrocatalytic systems. Among them, transition metal complexes, characterized by a redox-active single-metal-atom with biomimetic ligands, such as pyrolyzed cobalt–nitrogen–carbon (Co–Nx/C), have attracted considerable attention. Therefore, we reported the ORR mechanism of pyrolyzed Vitamin B12 using operando X-ray absorption spectroscopy coupled with electrochemical impedance spectroscopy, which enables operando monitoring of the oxygen binding site on the metal center. Our results revealed the preferential adsorption of oxygen at the Co2+ center, with end-on coordination forming a Co2+-oxo species. Furthermore, the charge transfer mechanism between the catalyst and reactant enables further Co–O species formation. These experimental findings, corroborated with first-principle calculations, provide insight into metal active-site geometry and structural evolution during ORR, which could be used for developing material design strategies for high-performance electrocatalysts for fuel cell applications.
關鍵字Characterization and analytical techniques;Electrocatalysis;Fuel cells
語言英文(美國)
ISSN2041-1723
期刊性質國外
收錄於SCI;
產學合作
通訊作者
審稿制度
國別英國
公開徵稿
出版型式,電子版
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