Wu Jun, Li Peng, Parra-Puerto Andres, Wu Shuang, Lin Xiaoqian, Kramer Denis, Chen Shengli, Kucernak Anthony
Department of Chemistry, Imperial College London, London SW7 2AZ, U.K.
College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, Hubei, People's Republic of China.
ACS Appl Mater Interfaces. 2020 Oct 21;12(42):47397-47407. doi: 10.1021/acsami.0c10441. Epub 2020 Oct 7.
The effect of doping Cr on the electrocatalytic activity of CoP supported on carbon black (CrCoP/CB) for the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in alkaline solution was investigated. A beneficial improvement in the performance of CoP toward HER and OER was discovered. For the HER at -200 mV overpotential, the turnover frequency (TOF) increases almost 6-fold from 0.26 to 1.52 electron site s when CoP/CB has a small amount of Cr added to form CrCoP/CB. Similarly, we estimate an increase from 0.205 to 0.585 electron site s for the OER at 1.6 V for the same change in composition. With 10 atom % Cr doping, the CrCoP/CB catalyst needed 226 mV overpotential to produce a cathodic current density of -100 A g and 380 mV overpotential to produce an anodic current density of 100 A g. Based on both experimental results and theoretical calculations, the activity improvement results from optimization of the electronic properties of CoP after Cr doping.
研究了掺杂Cr对负载在炭黑上的CoP（CrCoP/CB）在碱性溶液中析氢反应（HER）和析氧反应（OER）的电催化活性的影响。发现CoP对HER和OER的性能有有益的改善。对于在-200 mV过电位下的HER，当CoP/CB添加少量Cr形成CrCoP/CB时，周转频率（TOF）从0.26增加到1.52电子位点每秒，几乎增加了6倍。同样，对于相同组成变化，在1.6 V下OER的TOF从0.205增加到0.585电子位点每秒。掺杂10原子%的Cr时，CrCoP/CB催化剂产生-100 A g的阴极电流密度需要226 mV的过电位，产生100 A g的阳极电流密度需要380 mV的过电位。基于实验结果和理论计算，活性的提高源于Cr掺杂后CoP电子性质的优化。
