Tungsten Nitride-Cobalt Anchored in N-Doped Ordered Porous Carbon as an Efficient Oxygen Reduction Reaction Electrocatalyst

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• 作者：Yan Zhou ; Dr. Hairong Xue ; Dr. Tao Wang ; Dr. Hu Guo ; Dr. Xiaoli Fan ; Dr. Li Song ; Dr. Wei Xia ; Dr. Hao Gong ; Yuping He ; Junwei Wang and Prof. Jianping He
• 刊名：Chemistry – An Asian Journal
• 出版年：2017
• 出版时间：January 3, 2017
• 年：2017
• 卷：12
• 期：1
• 页码：60-66
• 全文大小：2236K
• ISSN：1861-471X

文摘

We prepared a non-precious-metal tungsten nitride-cobalt (WN-Co) electrocatalyst anchored in nitrogen-doped ordered porous carbon (NOPC) through an in situ method. The WN-Co/NOPC electrocatalyst possesses good oxygen reduction reaction (ORR) capability in alkaline media, including a high onset potential of −132 mV, a dominant four-electron process, and a superior stability (onset potential and limiting current density were almost unchanged after 5000 cycles in 0.1 m KOH). The improved ORR performance was comparable to that of WN/NOPC and Co/NOPC with regard to three aspects: the even dispersion and uniform size of electrocatalyst particles provide more reactive sites; the nitrogen doping, high specific surface area and highly ordered mesoporous channel of catalyst support (NOPC) are conducive to the infiltration of the electrolyte; the existence of WN reinvests the catalyst with good stability, and the anchored configuration of WN and Co in the NOPC will prevent the particles from agglomerating after a long-term cycle, thereby improving the stability of the catalyst particles.