Structural evolution of a water oxidation catalyst by incorporation of high-valent vanadium from electrolyte solution
學年 111
學期 2
出版（發表）日期 2023-06-26
作品名稱 Structural evolution of a water oxidation catalyst by incorporation of high-valent vanadium from electrolyte solution
作品名稱（其他語言）
著者 Baghendra Singh; Yu-Cheng Huang; Adyasa Priyadarsini; Pandian Mannu; Sanchaita Dey; Goutam Kumar Lahiri; Bhabani S. Mallik; Chung-Li Dong; Arindam Indra
單位
出版者
著錄名稱、卷期、頁數 Journal of Materials Chemistry A 11(29), p.15906-15914
摘要 The electrochemical reconstruction of transition metal-based precatalysts during anodic water oxidation has a prominent effect on the structural, morphological, and electronic properties of the active catalysts resulting in improved oxygen evolution activity. Exploring the atomic and electronic structure of the active catalyst for electrochemical water oxidation is crucial to establish the structure–activity relationship. Herein, we have demonstrated an efficient active water oxidation catalyst, VNi-AC-1, obtained by the incorporation of high valent vanadium from the electrolyte solution during the anodic reconstruction of the precatalyst Ni-coordination polymer (CP). Though both the active catalysts Ni(O)OH and [V]–Ni(O)OH contain mixed valent Ni2+ and Ni3+ species, X-ray absorption spectroscopy reveals that the incorporation of vanadium in the active catalyst increases the amount of Ni3+ sites, shortens the Ni–O bonds, decreases the coordination number of Ni, and creates a highly disordered structure to improve the water oxidation activity. VNi-AC-1 delivered 50 mA cm−2 current density at only 290 mV overpotential compared to the hydrothermally prepared NiV-LDH (360 mV) and NiFe-LDH, (340 mV). Moreover, VNi-AC-1 recorded an excellent durability of 60 h for continuous oxygen evolution. The density functional theory calculations for the V-incorporated Ni(O)(OH) show that the O* species formation is the rate-determining step where the O–O bond formation occurred by the attack of nucleophilic hydroxide ion.
關鍵字
語言 en
ISSN 2050-7488
期刊性質 國外
收錄於 SCI
產學合作
通訊作者
審稿制度 否
國別 GBR
公開徵稿
出版型式 ,電子版
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機構典藏連結 ( http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/125579 )