Xue Sen, Chen Long, Liu Zhibo, Cheng Hui-Ming, Ren Wencai
Shenyang National Laboratory for Materials Science, Institute of Metal Research , Chinese Academy of Sciences , 72 Wenhua Road , Shenyang 110016 , P.R. China.
School of Materials Science and Engineering , Northeastern University , 3 Wenhua Road , Shenyang 110819 , P.R. China.
ACS Nano. 2018 Jun 26;12(6):5297-5305. doi: 10.1021/acsnano.7b09146. Epub 2018 Jun 14.
Developing new electrocatalysts is essentially important for efficient water splitting to produce hydrogen. Two-dimensional (2D) materials provide great potential for high-performance electrocatalysts because of their high specific surface area, abundant active edges, and tunable electronic structure. Here, we report few-layer NiPS nanosheet-graphene composites for high-performance electrocatalysts for oxygen evolution reaction (OER). The pure NiPS nanosheets show an overpotential of 343 mV for a current density of 10 mA cm, which is comparable to that for IrO and RuO catalysts. More importantly, the NiPS nanosheet-graphene composites show significantly improved OER activity due to the synergistic effect. The optimized composite shows a very low overpotential of 294 mV for a current density of 10 mA cm, 351 mV for a current density of 100 mA cm, a small Tafel slope of 42.6 mV dec, and excellent stability. These overall performances are far better than those of the reported 2D materials and even better than those of many traditional materials even at a much lower mass loading of NiPS.
开发新型电催化剂对于高效水分解制氢至关重要。二维（2D）材料因其高比表面积、丰富的活性边缘和可调节的电子结构，为高性能电催化剂提供了巨大潜力。在此，我们报道了用于析氧反应（OER）的高性能电催化剂的少层NiPS纳米片-石墨烯复合材料。纯NiPS纳米片在电流密度为10 mA cm时的过电位为343 mV，这与IrO和RuO催化剂相当。更重要的是，由于协同效应，NiPS纳米片-石墨烯复合材料的OER活性显著提高。优化后的复合材料在电流密度为10 mA cm时的过电位非常低，为294 mV，在电流密度为100 mA cm时为351 mV，塔菲尔斜率小，为42.6 mV dec，并且具有出色的稳定性。即使在NiPS质量负载低得多的情况下，这些整体性能也远优于已报道的二维材料，甚至优于许多传统材料。
