Tungsten Nitride-Cobalt Anchored in N-Doped Ordered Porous Carbon as an Efficient Oxygen Reduction Reaction Electrocatalyst
Tungsten Nitride-Cobalt Anchored in N-Doped Ordered Porous Carbon as an Efficient Oxygen Reduction Reaction Electrocatalyst
复制标题
氮掺杂有序多孔碳锚定氮化钨钴作为高效氧还原反应电催化剂
DOI：
10.1002/asia.201601253
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发表时间：
2017
影响因子：
4.1
通讯作者：
He Jianping
中科院分区：
文献类型：
--
作者：
Zhou Yan;Xue Hairong;Wang Tao;Guo Hu;Fan Xiaoli;Song Li;Xia Wei;Gong Hao;He Yuping;Wang Junwei;He Jianping
我们通过原位方法制备了锚定在氮掺杂有序多孔碳（NOPC）中的非贵金属氮化钨-钴（WN-Co）电催化剂。WN‐Co/NOPC电催化剂在碱性介质中具有良好的氧还原反应（ORR）能力，包括−132 mV的高起始电位、占主导地位的四电子过程和优异的上级稳定性（在0.1 mKOH中5000次循环后起始电位和极限电流密度几乎不变）。 与WN/NOPC和Co/NOPC相比，该催化剂在三个方面都有明显的提高：催化剂颗粒的均匀分散和尺寸均匀提供了更多的反应活性中心，催化剂载体（NOPC）的氮掺杂、高比表面积和高度有序的介孔通道有利于电解质的渗透，催化剂的活性中心的分散和尺寸均匀提供了更多的反应活性中心。WN的存在使催化剂具有良好的稳定性，并且WN和Co在NOPC中的锚定构型将防止颗粒在长时间循环后团聚，从而提高催化剂颗粒的稳定性。
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 0.1mKOH). 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.