电沉积FeCoNi层状氢氧化物作为碱性水电解析氧反应催化剂的研究

在-0.8～-1.2 V(vs.SCE)的电位范围内,通过不同时间的电沉积,制备了FeCoNi层状氢氧化物.在-1.0 V下沉积600 s得到的FeCo5Ni13,均匀分布在泡沫镍(NF)基体表面,呈层状结构.FeCo5Ni13的层厚约30 nm,彼此交织形成蜂窝状,不仅提供了高的比表面积,还增强了FeCo5 Ni13...

Electrodeposition of FeCoNi Layered Hydroxides as Catalysts of Oxygen Evolution Reaction in Alkaline Water Electrolysis

FeCoNi layered hydroxides were prepared by electrodeposition at the potential range from -0.8 V to -1.2 V for various deposition time. FeCo5Ni13 were obtained at -1.0 V for 600 s, which uniformly distributed on the surface of NF matrix and presented a layered structure. The layers of FeCo5Ni13 were about 30 nm thick and interwoven with each other to form a honeycomb shape, which not only provided a high specific surface area, but also strengthen the connection between the FeCo5Ni13 and the substrate. When used as the catalysts of oxygen evolution reaction, FeCo5Ni13LH had the lowest initial potential of 1.48 V vs. RHE, and the smallest overpotentials of 310 mV, respectively at 100 mA cm-2, as well as the lowest Tafel slope, only 39 mV dec-1, indicating the best catalytic performance. After long-term electrolysis at 10 mA cm-2 for 120 h, FeCo5Ni13LH still maintained the honeycomb structure and nearly the same catalytic performances. Therefore, electrodeposition of FeCo5Ni13 layered hydroxides implied a good application prospect in oxygen evolution reaction in alkaline water electrolysis.