Key Laboratory of Biomass Chemical Engineering of Ministry of Education, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China.
Nanoscale. 2019 Nov 28;11(46):22261-22269. doi: 10.1039/c9nr07986f.
Low-cost and highly effective transition metal oxides are being widely researched as one of the most promising electrocatalysts for the oxygen evolution reaction (OER). However, traditional transition metal oxides suffer from sluggish reaction kinetics due to their intrinsically poor electronic conductivity. Herein, we demonstrate a facile polydopamine-assisted carburization strategy for the confined synthesis of novel NiOx/Ni ultrathin heterostructured nanosheets. Benefiting from the large exposed surface area and fast charge transfer, the obtained ultrathin NiOx/Ni heterostructured nanosheets exhibit an overpotential of 358 mV at a current density of 10 mA cm-2 and a small Tafel slope of 51 mV dec-1, outperforming other reported representative nickel oxide based materials and commercial Ir/C catalysts. In addition, a sustainable and efficient overall water-splitting electrolyzer integrated ultrathin NiOx/Ni nanosheets with commercial Pt/C can be effectively and stably driven by solar cells.
低成本且高效的过渡金属氧化物作为最有前途的析氧反应 (OER) 电催化剂之一受到广泛研究。然而，由于其固有的电子导电性差，传统的过渡金属氧化物反应动力学缓慢。在此，我们展示了一种简便的聚多巴胺辅助碳化策略，用于受限合成新型 NiOx/Ni 超薄异质结构纳米片。受益于大的暴露表面积和快速的电荷转移，所获得的超薄 NiOx/Ni 异质结构纳米片在 10 mA cm-2 的电流密度下表现出 358 mV 的过电势和 51 mV dec-1 的小塔菲尔斜率，优于其他报道的代表性氧化镍基材料和商业 Ir/C 催化剂。此外，集成有商业 Pt/C 的超薄 NiOx/Ni 纳米片的可持续且高效的整体水分解电解槽可以有效地、稳定地由太阳能电池驱动。
