Anion-Induced Size Selection of beta-Mo2C Supported on Nitrogen-Doped Carbon Nanotubes for Electrocatalytic Hydrogen Evolution
Anion-Induced Size Selection of beta-Mo2C Supported on Nitrogen-Doped Carbon Nanotubes for Electrocatalytic Hydrogen Evolution
复制标题
氮掺杂碳纳米管负载 β-Mo2C 的阴离子诱导尺寸选择用于电催化析氢
DOI：
10.1021/acssuschemeng.8b02194
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发表时间：
2018
影响因子：
8.4
通讯作者：
Xu Ping
中科院分区：
文献类型：
--
作者：
Ji Min;Niu Siqi;Du Yunchen;Song Bo;Xu Ping
碳化钼材料具有与铂基催化剂相似的电子结构和催化活性，被认为是很有前途的析氢反应电催化剂。在这里，我们报道了一种简单的氮掺杂碳纳米管负载的β-Mo2C纳米粒子(Mo2C/N-C)的合成方法。结果表明，通过添加不同的含钼阴离子可以有效地调节得到的Mo2C纳米粒子的尺寸。以MoO42-和Na2MoO4为原料，制备的具有超细(2-3 nm)Mo2C纳米粒子的Mo2C/N-C(S)在酸性介质中表现出良好的电催化活性，在几何电流密度−10 mA cm-2和Tafel斜率58 mV dec-1下，过电位为189 mV。本研究为可控合成过渡金属碳化物纳米粒子提供了新的途径。
Molybdenum carbide materials are considered to be promising hydrogen evolution reaction (HER) electrocatalysts due to their similar electronic structures and catalytic activities to Pt-based catalysts. Here, we report a facile synthesis of β-Mo2C nanoparticles supported on nitrogen-doped carbon nanotubes (Mo2C/N–C) through a one-step carbonization of Mo-containing anion-doped polyaniline nanotubes. It has been revealed that the size of the obtained Mo2C nanoparticles can be effectively tuned by applying different Mo-containing anions. With MoO42–from Na2MoO4, the as-prepared Mo2C/N–C(S) with ultrasmall (2–3 nm) Mo2C nanoparticles shows excellent electrocatalytic HER activity in acidic media, with an overpotential of 189 mV vs reversible hydrogen electrode (RHE) at a geometric current density of −10 mA cm–2and a Tafel slope of 58 mV dec–1. This study opens up a new avenue for the size-controllable synthesis of transition metal carbide nanoparticles loaded on carbon supports for energy conversion applications.