Cobalt phosphide nanoparticles embedded in 3D N-doped porous carbon for efficient hydrogen and oxygen evolution reactions. (22nd February 2019)

• Record Type: Journal Article
• Authors: Yang, Saisai; Xie, Meng; Chen, Linlin; Wei, Wei; Lv, Xiaomeng; Xu, Yuanguo; Ullah, Nabi; Judith, Oluigbo Chidinma; Adegbemiga, Yusuf Bashir; Xie, Jimin
• Is Part Of: International journal of hydrogen energy. Volume 44:Number 10(2019)
• Page Start: 4543
• Page End: 4552
• Publication Date: 2019-02-22
• Subjects: Cobalt phosphide -- 3D porous structure -- Hydrogen evolution reaction -- Oxygen evolution reaction -- Electrocatalysis; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2019.01.036
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: An electrocatalyst based on a unique three-dimensional (3D) N -doped porous carbon sheet networks embedded with CoP2 nanoparticles (CoP2 @3D-NPC) was synthesized by a facile pyrolysis process as well as an in-situ phosphatization method. The improved CoP2 @3D-NPC hybrid materials show excellent electrocatalytic activity toward HER and OER. This material provides a low overpotential of 126 mV at 10 mA cm −2 in 0.5 M H2 SO4 and 167 mV at 20 mA cm −2 in 1.0 M KOH for HER with a small Tafel slope value of 59 mV dec −1, respectively. Besides, it is also active for the OER under alkaline conditions. Such a prominent property of the CoP2 @3D-NPC electrocatalyst could be attributed to its excellent electrical conductivity of 3D carbon substrate, strong synergistic effect between CoP2 nanoparticles and carbon nanosheet as well as extra active sites created by the N -doped structure. Graphical abstract: Image 1 Highlights: CoP2 @3D-NPC was synthesized via a simple, efficient and easily large scale approach. CoP2 nanoparticles were well-defined and uniformly dispersed in carbon nanosheet. 3D N -doped porous carbon structure provides superior conductive matrix. CoP2 @3D-NPC demonstrates high activity towards HER and OER and excellent stability.