Mugheri Abdul Qayoom, Tahira Aneela, Aftab Umair, Bhatti Adeel Liaquat, Memon Nusrat Naeem, Memon Jamil-Ur-Rehman, Abro Muhammad Ishaque, Shah Aqeel Ahmed, Willander Magnus, Hullio Ahmed Ali, Ibupoto Zafar Hussain
Dr M. A. Kazi Institute of Chemistry, University of Sindh Jamshoro 76080 Sindh Pakistan
Department of Science and Technology, Campus Norrkoping, Linkoping University SE-60174 Norrkoping Sweden.
RSC Adv. 2019 Dec 20;9(72):42387-42394. doi: 10.1039/c9ra09351f. eCollection 2019 Dec 18.
In this study, a simple approach was used to produce nonprecious, earth abundant, stable and environmentally friendly NiCoO/CuO composites for the oxygen evolution reaction (OER) in alkaline media. The nanocomposites were prepared by a low temperature aqueous chemical growth method. The morphology of the nanostructures was changed from nanowires to porous structures with the addition of CuO. The NiCoO/CuO composite was loaded onto a glassy carbon electrode by the drop casting method. The addition of CuO into NiCoO led to reduction in the onset potential of the OER. Among the composites, 0.5 grams of CuO anchored with NiCoO (sample 2) demonstrated a low onset potential of 1.46 V a reversible hydrogen electrode (RHE). A current density of 10 mA cm was achieved at an over-potential of 230 mV and sample 2 was found to be durable for 35 hours in alkaline media. Electrochemical impedance spectroscopy (EIS) indicated a small charge transfer resistance of 77.46 ohms for sample 2, which further strengthened the OER polarization curves and indicates the favorable OER kinetics. All of the obtained results could encourage the application of sample 2 in water splitting batteries and other energy related applications.
在本研究中，采用了一种简单的方法来制备用于碱性介质中析氧反应（OER）的非贵金属、储量丰富、稳定且环境友好的NiCoO/CuO复合材料。通过低温水热化学生长法制备了纳米复合材料。随着CuO的加入，纳米结构的形态从纳米线转变为多孔结构。通过滴铸法将NiCoO/CuO复合材料负载到玻碳电极上。向NiCoO中添加CuO导致OER的起始电位降低。在这些复合材料中，0.5克与NiCoO结合的CuO（样品2）表现出1.46 V（相对于可逆氢电极（RHE））的低起始电位。在230 mV的过电位下实现了10 mA cm的电流密度，并且发现样品2在碱性介质中可稳定35小时。电化学阻抗谱（EIS）表明样品2的电荷转移电阻小，为77.46欧姆，这进一步强化了OER极化曲线，并表明了良好的OER动力学。所有获得的结果都可能促进样品2在水电解电池和其他能源相关应用中的应用。
