Ordered Mesoporous Nickel Sphere Arrays for Highly Efficient Electrocatalytic Water Oxidation

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• 作者：Tingting Sun ; Lianbin Xu ; Yushan Yan ; Anvar A. Zakhidov ; Ray H. Baughman ; Jianfeng Chen
• 刊名：ACS Catalysis
• 出版年：2016
• 出版时间：March 4, 2016
• 年：2016
• 卷：6
• 期：3
• 页码：1446-1450
• 全文大小：425K
• ISSN：2155-5435

文摘

We report the preparation and use of the three-dimensionally ordered mesoporous Ni sphere arrays (3D-OMNiSA) as a highly effective OER catalyst in alkaline electrolyte. The 3D-OMNiSA is fabricated through lyotropic liquid crystal templating within a polymer inverse opal. The prepared 3D-OMNiSA catalyst exhibits a low overpotential of 254 mV at 10 mA cm^–2 and a small Tafel slope of 39 mV decade^–1, better than the commercial precious RuO₂ catalyst. The mass activity (166.5 A g^–1) and turnover frequency (0.0281 s^–1) of 3D-OMNiSA are about 4.3 and 2.2 times that of RuO₂, respectively. Additionally, this 3D-OMNiSA catalyst shows a high durability under harsh water oxidation cycling test. The outstanding OER performance of the 3D-OMNiSA could be attributed to the large surface area, efficient mass and charge transport, and high structural stability arising from the unique 3D hierarchical porous structure of the 3D-OMNiSA consisting of ordered close-packed mesoporous spheres.