A nickel (II) PY5 complex as an electrocatalyst for water oxidation

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• 作者：Lei Wang^a ; Lele Duan^a ; Ram B. Ambre^a ; Quentin Daniel^a ; Hong Chen^b ; Junliang Sun^b ; Biswanath Das^c ; Anders Thapper^c ; Jens Uhlig^d ; Peter Diné ; r^a ; Licheng Sun^a ; ^e ; ^{lichengs@kth.se" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Nickel complex ; Water oxidation catalyst ; Electrochemistry ; Water nucleophilic attack
• 刊名：Journal of Catalysis
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：335
• 期：Complete
• 页码：72-78
• 全文大小：911 K

文摘

A Ni-PY5 [PY5 = 2,6-bis(1,1-bis(2-pyridyl)ethyl)pyridine)] complex has been found to act as an electrocatalyst for oxidizing water to dioxygen in aqueous phosphate buffer solutions. The rate of water oxidation catalyzed by the Ni-PY5 is remarkably enhanced by the proton acceptor base HPO₄²⁻, with rate constant of 1820 M⁻¹ s⁻¹. Controlled potential bulk electrolysis with Ni-PY5 at pH 10.8 under an applied potential of 1.5 V vs. normal hydrogen electrode (NHE) resulted in dioxygen formation with a high faradaic efficiency over 90%. A detailed mechanistic study identifies the water nucleophilic attack pathway for water oxidation catalysis.