Boron- and Nitrogen-Codoped Molybdenum Carbide Nanoparticles Imbedded in a BCN Network as a Bifunctional Electrocatalyst for Hydrogen and Oxygen Evolution Reactions
Boron- and Nitrogen-Codoped Molybdenum Carbide Nanoparticles Imbedded in a BCN Network as a Bifunctional Electrocatalyst for Hydrogen and Oxygen Evolution Reactions
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DOI：
10.1021/acscatal.8b01794
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发表时间：
2018-09-01
期刊：
影响因子：
12.9
通讯作者：
Lee, Jae Sung
中科院分区：
文献类型：
--
作者：
Anjum, Mohsin Ali Raza;Lee, Min Hee;Lee, Jae Sung
通过一种环境友好的钼-咪唑-硼酸有机金属络合物，合成了硼、氮共掺杂碳化钼纳米颗粒(B，N：Mo2C@BCN)作为一种无贵金属杂化电催化剂。B，N：Mo2C/BCN催化剂在碱性水溶液中用作析氢反应和析氧反应的双功能电催化剂时，在碱性电解液中表现出较高的活性和稳定性，优于贵金属基铂碳和IrO2以及已报道的过渡金属碳化物基电催化剂。机理研究表明，该杂化材料性能的提高归功于其电荷转移特性的改善以及B、N共掺杂和嵌入在BCN网络中的微小纳米颗粒的形成而增加了电子结构。本研究所采用的合成方法也适用于其他过渡金属碳化物作为电催化剂的性能调整。
Boron- and nitrogen-codoped molybdenum carbide nanoparticles imbedded in a B,N-doped carbon network (B,N:Mo2C@BCN) have been synthesized as a noble-metal-free hybrid electrocatalyst via an eco-friendly organometallic complex of Mo imidazole and boric acid. When it is used as a bifunctional electrocatalyst for the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in an aqueous alkaline solution, the B,N:Mo2C/BCN catalyst displays high activity and stability in basic electrolytes, better than those of noble-metal-based Pt/C and IrO2 and previously reported transition metal carbide based electrocatalysts. The mechanistic study reveals that the enhanced performance of the hybrid material is attributable to the improved charge transfer characteristics as well as increased electronic structure by B and N codoping and formation of tiny nanoparticles imbedded in BCN networks. The synthesis approach employed in this study could also be suitable for tuning properties of other transition-metal carbides for use as electrocatalysts.