电沉积镍-钼-钴泡沫合金析氢电极的工艺研究

Study on electrodeposition process of nickel-molybdenum-cobalt alloy foam as hydrogen evolution electrode

以聚氨酯海绵为基体,通过导电化处理、电沉积Ni–Mo–Co合金以及热分解处理工艺,制备了Ni–Mo–Co泡沫合金。研究了七水合硫酸钴和二水合钼酸钠用量、电流密度、温度等电沉积工艺参数对合金析氢性能的影响。结果表明,在七水合硫酸钴用量为14g/L,二水合钼酸钠用量为10g/L,温度为35°C,电流密度为8A/dm2的条件下制备的泡沫合金有最高的析氢活性,具有很大的比表面积。扫描电镜观察显示,制备的Ni–Mo–Co合金为三维网状结构,合金骨架有大量的微裂纹,表面为均匀致密的球状颗粒。

A Ni-Mo-Co alloy foam was prepared with polyurethane as substrate by a series of processes, including conduction treatment, Ni-Mo-Co alloy electrodeposition and thermal decomposition. The effects of electrodeposition process parameters, such as CoSO4·7H2O and Na2MoO4·2H2O dosages in bath, temperature and current density, on the hydrogen evolution performance of the alloy were studied. The results showed that the Ni-Mo-Co alloy foam with optimal hydrogen evolution activity can be obtained with COSO4·7H2O 14 g/L and Na2MoO4·7H2O 10 g/L at a temperature of 35℃ and a current density of 8 A/dm2. The foamed alloy electrode has a great specific surface area. The SEM observation indicated that the Ni-Mo--Co alloy foam has a three-dimensional reticular structure, featuring a large number of micro-cracks at the skeleton as well as uniform and dense spherical particles at the surface.