Molybdenum Phosphide Quantum Dots Encapsulated by P/N-Doped Carbon for Hydrogen Evolution Reaction in Acid and Alkaline Electrolytes.
ChemSusChem
; 16(20): e202300479, 2023 Oct 20.
Article
em En
| MEDLINE
| ID: mdl-37452791
ABSTRACT
A facile and eco-friendly strategy is presented for synthesizing novel nanocomposites, with MoP quantum dots (QDs) as cores and graphitic carbon as shells, these nanoparticles are dispersed in a nitrogen and phosphorus-doped porous carbon and carbon nanotubes (CNTs) substrates (MoP@NPC/CNT). The synthesis involves self-assembling reactions to form single-source precursors (SSPs), followed by pyrolysis at 900 °C in an inert atmosphere to obtain MoP@NPC/CNT-900. The presence of carbon layers on the MoP QDs effectively prevents particle aggregation, enhancing the utilization of active MoP species. The optimized sample, MoP@NPC/CNT-900, exhibits remarkable electrocatalytic activity and durability for the hydrogen evolution reaction (HER). It demonstrates a low overpotential of 155â
mV at 10â
mA cm-2 , a small Tafel slope of 76â
mV dec-1 , and sustained performance over 20â
hours in 0.5â
M H2 SO4 . Furthermore, the catalyst shows excellent activity in 1â
M KOH, with a relatively low overpotential of 131â
mV and long-term durability under constant current input. The exceptional HER activity can be attributed to several factors the superior performance of MoP QDs, the large surface area and good conductivity of the carbon substrates, and the synergistic effect between MoP and carbon species.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Idioma:
En
Revista:
ChemSusChem
Ano de publicação:
2023
Tipo de documento:
Article