Gu Ying, Wu Aiping, Jiao Yanqing, Zheng Huiru, Wang Xueqi, Xie Ying, Wang Lei, Tian Chungui, Fu Honggang
Key Laboratory of Superlight Materials and Surface Technology of Ministry of Education, College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin, 150001, P. R. China.
Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education of the People's Republic of China, Heilongjiang University, Harbin, 150080, China.
Angew Chem Int Ed Engl. 2021 Mar 15;60(12):6673-6681. doi: 10.1002/anie.202016102. Epub 2021 Feb 8.
Herein, we present a new strategy for the synthesis of 2D porous MoP/Mo N heterojunction nanosheets based on the pyrolysis of 2D [PMo O ] -melamine (PMo -MA) nanosheet precursor from a polyethylene glycol (PEG)-mediated assembly route. The heterostructure nanosheets are ca. 20 nm thick and have plentiful pores (<5 nm). These structure features offer advantages to promote the HER activity, including the favorable water dissociation kinetics around heterojunction as confirmed by theoretical calculations, large accessible surface of 2D nanosheets, and enhanced mass-transport ability by pores. Consequently, the 2D porous MoP/Mo N heterojunction nanosheets exhibit excellent HER activity with low overpotentials of 89, 91 and 89 mV to achieve a current density of 10 mA cm in alkaline, neutral and acidic electrolytes, respectively. The HER performance is superior to the commercial Pt/C at a current density >55 mA cm in neutral medium and >190 mA cm in alkaline medium.
在此，我们提出了一种基于二维[PMoO] -三聚氰胺（PMo -MA）纳米片前驱体通过聚乙二醇（PEG）介导的组装路线热解合成二维多孔MoP/MoN异质结纳米片的新策略。这种异质结构纳米片厚度约为20 nm，且具有大量孔隙（<5 nm）。这些结构特征为促进析氢反应（HER）活性提供了优势，包括理论计算证实的异质结周围有利的水离解动力学、二维纳米片的大可达表面以及孔隙增强的传质能力。因此，二维多孔MoP/MoN异质结纳米片在碱性、中性和酸性电解质中分别表现出优异的HER活性，低过电位分别为89、91和89 mV以实现10 mA cm的电流密度。在中性介质中电流密度>55 mA cm以及在碱性介质中电流密度>190 mA cm时，HER性能优于商业Pt/C。
