Back to Search
Start Over
N, P-codoped molybdenum carbide nanoparticles loaded into N, P-codoped graphene for the enhanced electrocatalytic hydrogen evolution.
- Source :
-
International Journal of Hydrogen Energy . Aug2022, Vol. 47 Issue 69, p29730-29740. 11p. - Publication Year :
- 2022
-
Abstract
- Based on the ever-growing interest of heteroatoms (e.g., P, N, S, transition metals) doping into molybdenum carbide and graphene for electrochemical reactions, herein, a ternary phosphomolybdic acid-polyethyleneimine/graphene oxide nanocomposite as a suitable precursor was developed to not only uniformly hybridize molybdenum and carbon source to perform the controllable in situ growth of well-defined molybdenum carbide nanostructure on graphene by annealing, but also synchronously dope N and P atoms into molybdenum carbide crystal lattice and graphene. The as-prepared hybrid showed remarkable electrocatalytic activity and high stability for hydrogen evolution reaction in basic media, due to the following favorable features, i.e. a large accessible active sites afforded by the ultrafine molybdenum carbide, the heteroatoms doped, the regulated electronic structure, the balanced thermodynamics between hydrogen adsorption and desorption, the accelerated charge/mass transfer ability by the ultrathin and defective carbon layer, and the protection of molybdenum carbide by carbon layer. As a result, it only needed a small overpotential of 47 mV to drive 10 mA cm−2 and a low onset potential of 10 mV, as well as a small Tafel slope of 56.8 mV·dec−1, thus suggesting its promising potential for hydrogen evolution electrocatalyst. [Display omitted] • Mo 2 C were facilely prepared using only phosphomolybdic acid and polyethyleneimine. • Mo 2 C was in situ grown on graphene and synchronously doped by N and P atoms. • N, P–Mo 2 C/NPrGO displayed remarkable HER performances (η 10 = 47 mV). [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 03603199
- Volume :
- 47
- Issue :
- 69
- Database :
- Academic Search Index
- Journal :
- International Journal of Hydrogen Energy
- Publication Type :
- Academic Journal
- Accession number :
- 158780039
- Full Text :
- https://doi.org/10.1016/j.ijhydene.2022.06.280