In Situ X-ray Absorption Near-Edge Structure Study of Advanced NiFe(OH)x Electrocatalyst on Carbon Paper for Water Oxidation

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• 作者：Dongniu Wang ; Jigang Zhou ; Yongfeng Hu ; Jinli Yang ; Na Han ; Yanguang Li ; Tsun-Kong Sham
• 刊名：Journal of Physical Chemistry C
• 出版年：2015
• 出版时间：August 27, 2015
• 年：2015
• 卷：119
• 期：34
• 页码：19573-19583
• 全文大小：609K
• ISSN：1932-7455

文摘

A promising NiFe(OH)_x catalyst for oxygen evolution reaction (OER) has been successfully fabricated and studied in detail using in situ X-ray absorption near-edge structure (XANES) spectroscopy. The chemical nature of elements (Ni, Fe) in electrocatalysts has been elucidated from Fe and Ni K- and L-edge XANES. The increase of oxidation states of Ni from Ni(III) to Ni(3.6) together with a highly covalent Fe(IV)鈥揙 bond under OER process is observed. Charge transfer between Ni and Fe through a 鈥淣i鈥揙鈥揊e鈥?bond is proposed, accounting for the high catalytic activities of NiFe(OH)_x.