Bimetallic Carbides-Based Nanocomposite as Superior Electrocatalyst for Oxygen Evolution Reaction
Bimetallic Carbides-Based Nanocomposite as Superior Electrocatalyst for Oxygen Evolution Reaction
复制标题
双金属碳化物基纳米复合材料作为析氧反应的优质电催化剂
DOI：
10.1021/acsami.7b01096
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发表时间：
2017-05-24
影响因子：
9.5
通讯作者：
Lan, Ya-Qian
中科院分区：
文献类型：
--
作者：
Tang, Yu-Jia;Liu, Chun-Hui;Lan, Ya-Qian
开发高效、低成本的析氧电催化剂是新能源技术发展的迫切需要。过渡金属碳化物作为析氢反应（HER）的电催化剂已被广泛研究，但作为析氧反应（OER）的电催化剂还有待进一步研究。在此，通过直接碳化Co掺杂的聚氧乙烯酸盐/导电聚乙烯/石墨氧化物（Co-PCG）前体来合成由N掺杂的多孔碳包覆并锚定在N掺杂的还原氧化石墨烯膜（Co 6 Mo 6C 2/NCRGO）上的钴钼基碳化物。Co/Mo摩尔比的精确控制。Co-PCG前驱体对于合成纯相Co 6 Mo 6C 2碳化钨是至关重要。Co 6 Mo 6C 2/NCRGO复合物作为一种高活性、高稳定性的OER电催化剂，在碱性溶液中表现出优异的活性，在10 mA cm（-2）时相对于RHE的过电位为260 mV，Tafel斜率为50 mV dec（-1），并且具有良好的长期稳定性。这种上级OER性能与活性Co 6 Mo 6C 2颗粒、聚吡咯（Pky）衍生的N掺杂多孔碳和导电RGO膜密切相关。值得注意的是，这是第一个证据表明，碳化硅被用作具有如此高的OER活性的OER催化剂。
The development of highly efficient and low-cost oxygen evolution electrocatalysts is extremely imperative for the new energy technology. Transition metal carbides have been investigated as remarkable hydrogen evolution reaction (HER) electrocatalysts but undesired oxygen evolution reaction (OER) electrocatalysts and need further study. Here, a cobaltinolybdenum-based bimetallic carbide coated by N-doped porous carbon and anchored on N-doped reduced graphene oxide film (Co6Mo6C2/NCRGO) is synthesized by directly carbonizing the Co-doped polyoxometalate/conductive polyiner/grapheoe oxide (Co-PCG) precursors. The precise control of the Co/Mo Molar ratio in. the Co-PCG precursor is of critical importance to synthesize pure phase bimetallic carbide of Co6Mo6C2. As the highly active and robust OER electrocatalyst, the Co6Mo6C2/NCRGO composite exhibits excellent activity in alkaline solution, affording a low overpotential of 260 mV versus RHE at 10 mA cm(-2), a small Tafel slope of 50 mV dec(-1), as well as long-term stability. The superior OER performances are strongly associated with the active Co6Mo6C2 particles, polypyrrole (Pky)-derived N-doped porous carbon, and the conductive RGO films. Remarkably, it is the first evidence that the bimetallic carbides were used as the OER catalysts with such high OER activity.