Highly Active Electrocatalysis of the Hydrogen Evolution Reaction by Cobalt Phosphide Nanoparticles**
Highly Active Electrocatalysis of the Hydrogen Evolution Reaction by Cobalt Phosphide Nanoparticles**
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DOI：
10.1002/anie.201402646
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发表时间：
2014-05-19
影响因子：
16.6
通讯作者：
Schaak, Raymond E.
中科院分区：
文献类型：
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作者：
Popczun, Eric J.;Read, Carlos G.;Schaak, Raymond E.
制备了磷化钴纳米颗粒CoP，并对其在强酸性条件下（0.5 m H2SO4, pH0.3）作为析氢反应（HER）的电催化剂进行了评价。通过Co纳米粒子与三辛基膦的反应，合成了均匀、多面的CoP纳米粒子。在Ti载体（2mgcm（-2）质量负载）上由CoP纳米颗粒组成的电极在-85mV过电位下产生20mAcm（-2）的阴极电流密度。CoP/Ti电极在0.50M H2SO4中持续制氢24小时内保持稳定。经过400次循环伏安扫描后，活性基本没有变化，表明在操作条件下具有长期生存能力。因此，CoP是迄今为止报道的最活跃、酸稳定、储量丰富的HER电催化剂之一。
Nanoparticles of cobalt phosphide, CoP, have been prepared and evaluated as electrocatalysts for the hydrogen evolution reaction (HER) under strongly acidic conditions (0.50M H2SO4, pH0.3). Uniform, multi-faceted CoP nanoparticles were synthesized by reacting Co nanoparticles with trioctylphosphine. Electrodes comprised of CoP nanoparticles on a Ti support (2mgcm(-2) mass loading) produced a cathodic current density of 20mAcm(-2) at an overpotential of -85mV. The CoP/Ti electrodes were stable over 24h of sustained hydrogen production in 0.50M H2SO4. The activity was essentially unchanged after 400 cyclic voltammetric sweeps, suggesting long-term viability under operating conditions. CoP is therefore amongst the most active, acid-stable, earth-abundant HER electrocatalysts reported to date.