Khdary Nezar H, El Enany Gaber, Almalki Amani S, Alhassan Ahmed M, Altamimi Abdullah, Alshihri Saeed
Institute of Materials Science, King Abdulaziz City for Science and Technology, Riyadh 11442, Saudi Arabia.
Department of Physics, College of Science and Arts in Uglat Asugour, Qassim University, Buraydah 52571, Saudi Arabia.
Nanomaterials (Basel). 2023 Feb 28;13(5):911. doi: 10.3390/nano13050911.
In this work, the solvothermal solidification method has been used to be prepared as a homogenous CuSn-organic nano-composite (CuSn-OC) to use as a catalyst for alkaline water electrolysis for cost-effective H generation. FT-IR, XRD, and SEM techniques were used to characterize the CuSn-OC which confirmed the formation of CuSn-OC with a terephthalic acid linker as well as Cu-OC and Sn-OC. The electrochemical investigation of CuSn-OC onto a glassy carbon electrode (GCE) was evaluated using the cyclic voltammetry (CV) method in 0.1 M KOH at room temperature. The thermal stability was examined using TGA methods, and the Cu-OC recorded a 91.4% weight loss after 800 °C whereas the Sn-OC and CuSn-OC recorded 16.5 and 62.4%, respectively. The results of the electroactive surface area (ECSA) were 0.5, 0.42, and 0.33 m g for the CuSn-OC, Cu-OC, and Sn-OC, respectively, and the onset potentials for HER were -420, -900, and -430 mV vs. the RHE for the Cu-OC, Sn-OC, and CuSn-OC, respectively. LSV was used to evaluate the electrode kinetics, and the Tafel slope for the bimetallic catalyst CuSn-OC was 190 mV dec, which was less than for both the monometallic catalysts, Cu-OC and Sn-OC, while the overpotential was -0.7 vs. the RHE at a current density of -10 mA cm.
在这项工作中，采用溶剂热固化法制备了一种均匀的铜锡有机纳米复合材料（CuSn-OC），用作碱性水电解制氢的催化剂，以实现经济高效的氢气生成。采用傅里叶变换红外光谱（FT-IR）、X射线衍射（XRD）和扫描电子显微镜（SEM）技术对CuSn-OC进行了表征，证实了以对苯二甲酸为连接体的CuSn-OC以及Cu-OC和Sn-OC的形成。在室温下，使用循环伏安法（CV）在0.1 M氢氧化钾中评估了CuSn-OC在玻碳电极（GCE）上的电化学性能。使用热重分析法（TGA）检测了热稳定性，Cu-OC在800℃后失重91.4%，而Sn-OC和CuSn-OC分别失重16.5%和62.4%。CuSn-OC、Cu-OC和Sn-OC的电活性表面积（ECSA）结果分别为0.5、0.42和0.33 m²/g，析氢反应（HER）的起始电位相对于可逆氢电极（RHE），Cu-OC、Sn-OC和CuSn-OC分别为-420、-900和-430 mV。采用线性扫描伏安法（LSV）评估电极动力学，双金属催化剂CuSn-OC的塔菲尔斜率为190 mV/dec，小于单金属催化剂Cu-OC和Sn-OC，而在电流密度为-10 mA/cm²时，过电位相对于RHE为-0.7 V。
