Selective-leaching method to fabricate an Ir surface-enriched Ir-Ni oxide electrocatalyst for water oxidation

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• 作者：Shuai Xu ; Shengli Chen ; Lihong Tian ; Qinghua Xia…
• 刊名：Journal of Solid State Electrochemistry
• 出版年：2016
• 出版时间：July 2016
• 年：2016
• 卷：20
• 期：7
• 页码：1961-1970
• 全文大小：1,973 KB
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Physical Chemistry
  Analytical Chemistry
  Industrial Chemistry and Chemical Engineering
  Characterization and Evaluation Materials
  Condensed Matter
  Electronic and Computer Engineering
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1433-0768
• 卷排序：20

文摘

Durable and precious metal-lean electrocatalyst for water oxidation in acidic media would be of great significance for the large-scale application of acidic water electrolysis. Here, we report an Ir-Ni binary oxide electrocatalyst for the oxygen evolution reaction (OER) fabricated by acid leaching of Ni from Ni-rich composite oxides prepared using pyrolysis method. This Ni-leached binary oxide possesses Ir-enriched surface, porous morphology, and rutile phase structure of IrO₂ with contracted lattice. In contrast, Ir-Ni binary oxide with the same composition prepared using simple pyrolysis method exhibits a rod-like aggregated morphology with Ni-enriched surface. Catalytic activity for OER of the Ni-leached binary oxide is higher than that of the pyrolyzed Ir-Ni oxide and pure IrO₂. More importantly, the Ni-leached binary oxide exhibits much superior durability during continuous oxygen evolution process under a constant potential of 1.6 V compared with the pyrolyzed binary oxide and pure IrO_2. Attributed to the Ir-rich surface and the anchor effect of inner Ni atoms to outer Ir atoms, the Ni-leached binary oxide shows a possibility of reducing the demand of the expensive and scarce Ir in OER electrocatalyst for acidic water splitting.KeywordsOxygen evolution reactionIr-Ni binary oxideSelective leachingIr-enriched structure