Ultra-thin N-doped-graphene encapsulated Ni nanoparticles coupled with MoO2 nanosheets for highly efficient water splitting at large current density. Issue 29 (14th July 2020)

• Record Type: Journal Article
• Authors: Qian, Guangfu; Yu, Guangtao; Lu, Jiajia; Luo, Lin; Wang, Ting; Zhang, Chenghui; Ku, Ruiqi; Yin, Shibin; Chen, Wei; Mu, Shichun
• Is Part Of: Journal of materials chemistry. Volume 8:Issue 29(2020)
• Page Start: 14545
• Page End: 14554
• Publication Date: 2020-07-14
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d0ta04388e
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : Ultra-thin N-doped-graphene encapsulated Ni nanoparticles coupled with MoO2 nanosheets are prepared for HER and OER. As used for overall water splitting, it can work for 196 h at 1000 mA cm −2 . Abstract : An efficient non-noble metal-based bifunctional catalyst with ultrahigh performance at large current density is imperative for industrial electrochemical water splitting. Herein, ultra-thin N-doped-graphene encapsulated Ni nanoparticles coupled with MoO2 nanosheets self-supported on 3D nickel foam are synthesized by a hydrothermal method and post-treatment at high temperature. The experimental results and theoretical calculations confirm the electron transfer from Ni to N-doped-graphene at the interface, which can boost the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) performance. It displays Pt-like HER activity, can reach −10 mA cm −2 with a lower overpotential of 25 mV, and hold at −400 and −1000 mA cm −2 for 172 h without decline in performance. Meanwhile, it also exhibits good OER performance at large current density and can work for 196 h at 1000 mA cm −2 without attenuation as the cathode and anode, suggesting superior durability. This work indicates that the interface engineering of the N-doped-graphene encapsulated structure is beneficial to overall water splitting and offers a promising method for future hydrogen production.