Copper-based electrocatalyst derived from a copper chelate polymer for oxygen reduction reaction in alkaline solutions
Copper-based electrocatalyst derived from a copper chelate polymer for oxygen reduction reaction in alkaline solutions
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DOI：
10.1016/j.cattod.2020.06.005
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发表时间：
2020-06
期刊：
影响因子：
5.3
通讯作者：
Ridwan P. Putra;Yudai Samejima;S. Nakabayashi;H. Horino;I. Rzeznicka
中科院分区：
文献类型：
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作者：
Ridwan P. Putra;Yudai Samejima;S. Nakabayashi;H. Horino;I. Rzeznicka
寻找一种能够在碱性溶液中有效催化氧还原反应（ORR）的非贵金属电催化剂对于提高碱性燃料电池和金属-空气电池的性能和成本具有重要意义。在这项工作中，氧化铜（Cu 2 O）的纳米结构，通过在1 M KOH溶液中的二硫代草酰胺铜（dto）螯合聚合物的电化学转化获得。为了提高Cu 2 O的导电性和分散性，乙炔黑矩阵发生了电化学转化。将所得的Cu 2 O/C纳米复合材料生长在玻碳电极上，并利用循环伏安法（CV）和旋转圆盘电极（RDE）线性扫描伏安法（LSV）研究了其在1 M KOH中对ORR的电催化活性。在O2饱和的KOH溶液中观察到ORR活性。半波电位（E1/2）的值估计为0.72V（相对于RHE），其接近于基准40%Pt/C催化剂的E1/2值。发现电子转移数n为3，表明除了直接的4 e −还原过程外，2 e −还原过程也发生，主要发生在碳基质上。结果表明，Cu（dto）衍生的Cu 2 O/C纳米复合材料由于其在碱性溶液中更好的质量活性和稳定性，可以提供贵金属ORR电催化剂的具有成本效益的替代物。
Searching for a non-noble metal electrocatalyst that could efficiently catalyze oxygen reduction reaction (ORR) in alkaline solutions is of great importance for improving the performance and costs of alkaline fuel cells and metal-air batteries. In this work, copper oxide (Cu2O) nanostructures were obtained via an electrochemical transformation of a copper dithioxamide Cu(dto) chelate polymer in 1 M KOH solution. To improve conductivity and dispersion of Cu2O, the electrochemical transformation took place in the acetylene black matrix. The resultant Cu2O/C nanocomposite was grown on a glassy carbon electrode and its electrocatalytic activity towards ORR in 1 M KOH was studied using cyclic voltammetry (CV) and rotating disk electrode (RDE) linear sweep voltammetry (LSV). The ORR activity was observed in O2-saturated KOH solutions. The value of the half-wave potential (E1/2) was estimated to be 0.72 V vs. RHE, which is close to theE1/2value of the benchmark 40 % Pt/C catalysts. The electron transfer number,n, was found to be 3, suggesting that in addition to the direct 4e−reduction process, the 2e−reduction processes also occur, mostly on the carbon matrix. The results indicate that the Cu(dto)-derived Cu2O/C nanocomposite may provide a cost-effective alternative to noble metals ORR electrocatalyst due to its better mass activity and stability in alkaline solutions.