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Studying the Effect of CuCo2S4 Morphology on the Oxygen Evolution Reaction using a Flexible Carbon Cloth Substrate
ChemElectroChem ( IF 3.5 ) Pub Date : 2020-01-31 , DOI: 10.1002/celc.201902128
Minglong Lu 1 , Xia Cui 1, 2, 3 , Bo Song 1, 2, 3 , Hongzhen Ouyang 3 , Kunliang Wang 3 , Yuqiao Wang 1
Affiliation  

The different morphologies of CuCo2S4 have a significant effect on the electrocatalytic activity. However, the reasons for the activity difference of catalysts with multiple morphologies have raised little concern. Herein, we put forward the concept of “active edge perimeter” to evaluate the relative number of active sites. The morphologies are regulated by arranging NH4F from 0 to 3 mmol to prepare microsheet, tight‐binding microsheet, hybrid microsheet/wire, long microwire and short wire morphologies. The long‐perimeter microsheets can achieve a low Tafel slope (89 mV dec−1) and overpotential (283 mV) to reach a current density of 20 mA cm−2 for the oxygen evolution reaction. For microsheets, the charge‐transfer resistance is well under 50 % of the average values. The electrochemical surface area is above average area, owing to the high double‐layer capacitance. Therefore, for two‐dimensional microsheets, the long active perimeter is the main reason it ensures the high activity required for hierarchical catalysts.

中文翻译:

使用柔性碳布基质研究CuCo2S4形态对氧气析出反应的影响

CuCo 2 S 4的不同形态对电催化活性有重要影响。然而,具有多种形态的催化剂的活性差异的原因引起了很少的关注。在此,我们提出了“活动边缘周长”的概念来评估活动站点的相对数量。通过将NH 4 F的浓度设置为0至3 mmol来调节形态,以制备微片,紧密粘合微片,混合微片/金属丝,长微丝和短金属丝形态。长周边微片可以实现低的Tafel斜率(89 mV dec -1)和超电势(283 mV),以达到20 mA cm -2的电流密度用于氧气释放反应。对于微片,电荷转移电阻远低于平均值的50%。由于高的双层电容,电化学表面积大于平均面积。因此,对于二维微片而言,活性周长是确保分级催化剂所需高活性的主要原因。
更新日期:2020-01-31
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