N-Carbon coated P-W2C composite as efficient electrocatalyst for hydrogen evolution reactions over the whole pH range
N-Carbon coated P-W2C composite as efficient electrocatalyst for hydrogen evolution reactions over the whole pH range
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DOI：
10.1039/c6ta09052d
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发表时间：
2017-01
影响因子：
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通讯作者：
Gang Yan;Caixia Wu;H. Tan;Xiaojia Feng;Likai Yan;Hong‐Ying Zang;Yangguang Li
中科院分区：
文献类型：
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作者：
Gang Yan;Caixia Wu;H. Tan;Xiaojia Feng;Likai Yan;Hong‐Ying Zang;Yangguang Li
开发一种高效稳定的非贵金属析氢反应电催化剂仍然是一个巨大的挑战。在此，我们报道了由多金属氧酸盐(H3PW12O40·xH2O)和双氰胺在高温下制备的P-W2C@NC(P-W2C@NC)是一种在整个pH范围(0-14)内高效稳定的HER电催化剂。要获得10 mA cm−2的电流密度，P-W2C@NC在酸性、碱性和中性溶液中的过电位分别为89 mV、63 mV和185 mV。这是碳化钨基HER电催化剂在全pH条件下高活性、高稳定性的首次报道，为HER用钨基类铂电催化剂的开发提供了新的途径。
Development of a highly efficient and stable hydrogen evolution reaction (HER) electrocatalyst based on non-precious-metal remains a great challenge. Herein, we report P-modified tungsten carbide encapsulated in N-doped carbon (P-W2C@NC) as an efficient and stable HER electrocatalyst over the whole pH range (0–14), prepared by annealing polyoxometalate (H3PW12O40·xH2O) and dicyandiamide at a high temperature. To achieve a current density of 10 mA cm−2, P-W2C@NC required an overpotential of 89 mV in acid, 63 mV in alkaline solution and 185 mV in neutral solution. This is the first case of a tungsten-carbide-based HER electrocatalyst operating at all pH values with high activity and stability, and might provide some new routes for the exploration of tungsten-based Pt-like electrocatalysts for the HER.