二维石墨炔/金属氢氧化物异质结用于高效析氧反应

Two-dimensional graphdiyne/metal hydroxide heterojunction for high-efficiency oxygen evolution reaction

析氧反应(OER)是能量转换过程中重要的半反应,开发高效、稳定、低成本的析氧反应催化剂具有重要的意义.本文报道了一种简单的原位可控生长的方法,在铜双金属氢氧化物纳米片表面原位生长石墨炔薄膜,形成了新型石墨炔/金属氢氧化物异质结界面结构,并通过改变化学组成的方法,实现对其电催化OER活性和稳定性的有效提升.研究结果显示Ni_(0.74)Cu_(0.26)LDH@GDY/NF具有最佳OER催化性能.电流密度为10 mA cm^(-2)时的过电位仅为292 mV,且具有优异的长期稳定性,比如在6000圈连续的循环测试后OER活性几乎无衰减.实验结果表明,石墨炔的引入可以有效增加活性表面积和活性位点,促进电荷转移提高导电性,且能够高效保护催化剂不被腐蚀,从而提高整体催化性能.

Oxygen evolution reaction(OER) is an important reaction in energy conversion process. It is of great significance to develop efficient, stable and low-cost catalysts for OER. Herein, we report a simple method for the insitu growth of graphdiyne(GDY) films on the surface of metal hydroxides, forming a new type of GDY/metal hydroxide heterojunction interface structure. By changing the chemical composition of the metal species, the improved OER activity and stability were achieved. Our results show that the Ni_(0.74)Cu_(0.26)LDH@GDY/NF has the best OER catalytic performance with the low overpotential of 292 mV at the current density of 10 mA cm^(-2), and excellent long-term stability. Experimental results reveal that the introduction of GDY can effectively increase the number of the active sites,improve the conductivity of the catalyst, protect the catalyst from corrosion, and finally enhance the overall catalytic performance.