以泡沫镍载NiCo2O4纳米线阵列为阴极催化剂的Al-H2O2半燃料电池

研究了以泡沫镍载NiCo2O4纳米线阵列为阴极催化剂的Al-H2O2半燃料电池的性能. 以无模板生长法制备了泡沫镍载NiCo2O4纳米线阵列阴极材料, SEM测定结果表明, NiCo2O4纳米线几乎垂直于泡沫镍载体表面生长. 以电压和功率密度-电流密度曲线研究了H2O2浓度、电解液流速和温度对电池性能的影响, 结果显示, 以铝片为阳极, 0.6 mol/L H2O2为氧化剂的电池的开路电压约为1.40 V; 在室温和57 ℃下, 电流密度为98和172 mA/cm2时, 最大功率密度分别达到79和120 mW/cm2.  在5000 s的测试时间内, 0.70 V的恒电流密度和75 mA/cm2 的恒电压值几乎为一常数, 这表明以泡沫镍载NiCo2O4纳米线阵列为催化剂电还原H2O2具有很好的活性、稳定性和传质性能.

Al-H2O2 Semi-fuel Cell Using Ni Foam Supported NiCo2O4 Nanowire Arrays as Cathode

A Al-H2O2 semi-fuel cell using Ni foam supported NiCo2O4  nanowire arrays as cathode was reported.  Ni foam supported-NiCo2O4 nanowire arrays were prepared by a template-free growth method, and demonstrated that NiCo2O4 nanowires grow almost vertically from the surface of foamed Ni substrate by scanning electron microscopy(SEM). The effects of concentrations of H2O2, flow rate of electrolyte as well as operation temperature on the cell performance were investigated. The cell exhibited an open circuit voltage of about 1.40 V; peak power densities of 79 and 120 mW/cm2 at current densities of 98  and 172 mA/cm2 and a cell voltage of 0.80 V and 0.70 V operating at room temperature and 320 K, respectively, using aluminium sheet as anode fuel and 0.6 mol/L H2O2 as oxidant. The current density at 0.7 V and voltage 75 mA/cm2 remained nearly constant within a 5000 s  test period, the Ni foam supported NiCo2O4  nanowire arrays electrode exhibits superior activity, stability, and mass transport property for H2O2 electroreduction.