Tartour Ahmed R, Sanad Moustafa M S, El-Hallag Ibrahim S, Moharram Youssef I
Central Metallurgical Research and Development Institute, P.O. Box: 87, Helwan, Cairo, 11421, Egypt.
Electroplating Department, Factory 100, Abu-Zaabal Company for Engineering Industries, Cairo, Egypt.
Sci Rep. 2024 Feb 26;14(1):4601. doi: 10.1038/s41598-024-54934-9.
A novel hybrid ternary metallic electrocatalyst of amorphous Mo/Co oxides and crystallized Cu metal was deposited over Ni foam using a one-pot, simple, and scalable solvothermal technique. The chemical structure of the prepared ternary electrocatalyst was systematically characterized and confirmed via XRD, FTIR, EDS, and XPS analysis techniques. FESEM images of (Mo/Co)O-Cu@NF display the formation of 3D hierarchical structure with a particle size range of 3-5 µm. The developed (Mo/Co)O-Cu@NF ternary electrocatalyst exhibits the maximum activity with 188 mV and 410 mV overpotentials at 50 mA cm for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), respectively. Electrochemical impedance spectroscopy (EIS) results for the (Mo/Co)O-Cu@NF sample demonstrate the minimum charge transfer resistance (R) and maximum constant phase element (CPE) values. A two-electrode cell based on the ternary electrocatalyst just needs a voltage of about 1.86 V at 50 mA cm for overall water splitting (OWS). The electrocatalyst shows satisfactory durability during the OWS for 24 h at 10 mA cm with an increase of only 33 mV in the cell potential.
采用一锅法、简单且可扩展的溶剂热技术，在泡沫镍上沉积了一种新型的非晶态Mo/Co氧化物和结晶态Cu金属的混合三元金属电催化剂。通过XRD、FTIR、EDS和XPS分析技术对制备的三元电催化剂的化学结构进行了系统表征和确认。(Mo/Co)O-Cu@NF的FESEM图像显示形成了三维分级结构，粒径范围为3-5μm。所制备的(Mo/Co)O-Cu@NF三元电催化剂在析氢反应(HER)和析氧反应(OER)中，在50 mA cm时分别具有188 mV和410 mV的过电位，表现出最大活性。(Mo/Co)O-Cu@NF样品的电化学阻抗谱(EIS)结果表明其电荷转移电阻(R)最小，恒相元件(CPE)值最大。基于该三元电催化剂的双电极电池在50 mA cm的电流密度下进行全水解(OWS)时仅需约1.86 V的电压。该电催化剂在10 mA cm的电流密度下进行24小时的OWS测试期间表现出令人满意的耐久性，电池电位仅增加33 mV。
