Hierarchical ZnxCo3鈥?i>xO4 Nanoarrays with High Activity for Electrocatalytic Oxygen Evolution

详细信息    查看全文

• 作者：Xijun Liu ; Zheng Chang ; Liang Luo ; Tianhao Xu ; Xiaodong Lei ; Junfeng Liu ; Xiaoming Sun
• 刊名：Chemistry of Materials
• 出版年：2014
• 出版时间：March 11, 2014
• 年：2014
• 卷：26
• 期：5
• 页码：1889-1895
• 全文大小：415K
• 年卷期：v.26,no.5(March 11, 2014)
• ISSN：1520-5002

文摘

The design and fabrication of efficient and inexpensive electrodes for use in the oxygen evolution reaction (OER) is essential for energy-conversion technologies. In this study, high OER performance is achieved using novel hierarchical Zn_xCo_3鈥?i>xO₄ nanostructures constructed with small secondary nanoneedles grown on primary rhombus-shaped pillar arrays. The nanostructures have large roughness factor, high porosity, and high active-site density. Only a small overpotential of 0.32 V is needed for a current density of 10 mA/cm² with a Tafel slope of 51 mV/decade. The nanostructures are also found to perform significantly better than pure Co₃O₄ and a commercial Ir/C catalyst and to perform similarly to the best OER catalysts that have been reported for alkaline media. These merits combined with the satisfactory stability of the nanostructures indicate that they are promising electrodes for water oxidation.