Controllable heteroatom doping effects of CrxCo2-xP Nanoparticles: A Robust Electrocatalyst for Overall Water Splitting in Alkaline Solutions.
Controllable heteroatom doping effects of CrxCo2-xP Nanoparticles: A Robust Electrocatalyst for Overall Water Splitting in Alkaline Solutions.
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DOI：
10.1021/acsami.0c10441
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发表时间：
2020-09
影响因子：
9.5
通讯作者：
Jun Wu;Peng Li;Andrés Parra-Puerto;Shuang Wu;Xiaoqian Lin;D. Kramer;Shengli Chen;A. Kucernak
中科院分区：
文献类型：
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作者：
Jun Wu;Peng Li;Andrés Parra-Puerto;Shuang Wu;Xiaoqian Lin;D. Kramer;Shengli Chen;A. Kucernak
研究了Cr掺杂对负载型Co2 P在碱性溶液中析氢和析氧反应的电催化活性的影响。发现了负载在炭黑上的Co2 P（CrxCo 2-xP/CB）对HER和OER的性能的有益改善。在-200 mV过电位下，当Co_2 P/CB中加入少量Cr形成Cr_（0.2）Co_（1.8）P/CB时，其电子翻转频率（TOF）从0.26增加到1.52。同样，我们估计增加0.205至0.585电子siteCo-1 s-1的OER在1.6V的相同的变化组合物。当Cr掺杂量为10at%时，Cr_（0.2）Co_（1.8）P/CB催化剂的阴极电流密度为-100 A g_Co^（-1），阴极过电位为226 mV，阳极电流密度为100 A g_Co^（-1），阳极过电位为380 mV。根据实验结果和理论计算，活性的提高是由于Cr掺杂后Co2 P的电子性质的优化。
The effect of doping Cr on the electrocatalytic activity of supported Co2P for the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in alkaline solution was investigated. A beneficial improvement in the performance of Co2P supported on carbon black (CrxCo2-xP/CB) towards HER and OER was discovered. For the HER at -200 mV overpotential the turnover frequency (TOF) increases almost six-fold from 0.26 to 1.52 electrons siteCo-1 s-1 when Co2P/CB has a small amount of Cr added to form Cr0.2Co1.8P/CB. Similarly, we estimate an increase from 0.205 to 0.585 electrons siteCo-1 s-1 for the OER at 1.6V for the same change in composition. With 10at% Cr doping, the Cr0.2Co1.8P/CB catalyst needed 226 mV overpotential to produce a cathodic current density of -100 A g_Co^(-1) and 380 mV overpotential to produce an anodic current density of 100 A g_Co^(-1). Based on both experimental results and theoretical calculations, the activity improvement results from optimization of electronic properties of Co2P after Cr doping.