富含缺陷的(Ni-Co)Ox-NiCo2S4三维异质纳米片的制备及氧析出性能研究

Defect-rich heterogeneous (Ni-Co)Ox/NiCo2S4 3D nanosheets as efficient electrocatalyst for oxygen evolution reaction

电解水过程中的阳极半反应-氧析出反应(OER)是四电子转移的动力学缓慢过程,且需较高的过电位来驱动该反应,故较高的OER过电位限制了电解水的效率,成为电解水技术发展的瓶颈。因此开发性能优异的OER催化剂,降低该反应的过电位是电解水技术发展的关键。本文通过水热法成功制备出富含缺陷的(Ni-Co)Ox/NiCo2S4三维异质纳米片,并测试其对OER的催化活性。(Ni-Co)Ox/NiCo2S4在碱性介质(1 mol/L KOH)中显示出优异的OER催化活性,在10 mA·cm^-2电流密度下的过电位为370 mV,在1.60 V vs. RHE恒压连续测试20 h,电流密度并未出现明显的变化,具有较好的电催化稳定性。

The anodic half-reaction oxygen evolution reaction(OER) in water splitting is a slow dynamic process of four-electron transfer, which requires a high overpotential to drive the reaction. However, the high OER overpotential reduces the efficiency of water splitting and becomes the bottleneck of water splitting technology. The exploration of highly efficient OER electrocatalysts and small overpotential reaction is crucial to develop the water splitting technology. Here the defective(Ni-Co)Ox/NiCo2S4 3 D heterogeneous nanosheets were successfully prepared by hydrothermal method, and their catalytic activity for OER was tested.(Ni-Co)Ox/NiCo2S4 shows excellent OER catalytic activity in alkaline medium(1 mol/L KOH). The overpotential is 370 mV at current density of 10 mA·cm^-2. And when the catalytic activity is tested continuously for 20 h at 1.60 V vs. RHE constant voltage, the current density shows no obvious change and(Ni-Co)Ox/NiCo2S4 shows excellent catalytic stability.