title: Synthesis of Cobalt Phosphide Nanoparticles Supported on Pristine Graphene by Dynamically Self-Assembled Graphene Quantum Dots for Hydrogen Evolution.
abstract: A highly active, durable, and low-cost hydrogen evolution reaction (HER) catalyst is desirable for energy storage through water splitting but its fabrication presents great challenges. Herein, mediated by dynamically self-assembled graphene quantum dots (GQDs), small, uniform, high-density, and well-dispersed CoP nanoparticles were grown in situ on pristine graphene for the first time. This hybrid nanostructure was then employed as HER electrocatalyst, showing an onset potential of 7 mV, an overpotential of 91.3 mV to achieve 10 mA cm-2, a Tafel slope of 42.6 mV dec-1, and an exchange current density of 0.1225 mA cm-2, all of which compare favorably to those of most reported non-noble-metal catalysts. The developed catalyst also exhibits excellent durability with negligible current loss after 2000 cyclic voltammetry cycles (+0.01 to -0.17 V vs. RHE) or 34 h of chronoamperometric measurement at an overpotential of 91.3 mV. This work not only develops a new strategy for the fabrication of high-performance and inexpensive electrocatalysts for HER but also provides scientific insight into the mechanism of the dynamically self-assembled GQDsmediated synthesis process.
authors.affiliation: Institute for Clean Energy & Advanced Materials, Faculty of Materials & Energy, Southwest University, Chongqing, 400715, P.R. China.|Chongqing Key Laboratory for Advanced Materials and Technologies of Clean Energies, Chongqing, 400715, P.R. China.
authors.forename: Xiaoyan
authors.initials: X
authors.lastname: Wang
authors.affiliation: Institute for Clean Energy & Advanced Materials, Faculty of Materials & Energy, Southwest University, Chongqing, 400715, P.R. China.|Chongqing Key Laboratory for Advanced Materials and Technologies of Clean Energies, Chongqing, 400715, P.R. China.
authors.forename: Weiyong
authors.initials: W
authors.lastname: Yuan
authors.affiliation: Institute for Clean Energy & Advanced Materials, Faculty of Materials & Energy, Southwest University, Chongqing, 400715, P.R. China.|Chongqing Key Laboratory for Advanced Materials and Technologies of Clean Energies, Chongqing, 400715, P.R. China.
authors.forename: Yanan
authors.initials: Y
authors.lastname: Yu
authors.affiliation: Institute for Clean Energy & Advanced Materials, Faculty of Materials & Energy, Southwest University, Chongqing, 400715, P.R. China.|Chongqing Key Laboratory for Advanced Materials and Technologies of Clean Energies, Chongqing, 400715, P.R. China.
authors.forename: Chang Ming
authors.initials: CM
authors.lastname: Li
mesh_terms: D002384:Catalysis; D006108:Graphite / Q000737:chemistry*; D006859:Hydrogen / Q000737:chemistry*; D053758:Nanoparticles / Q000737:chemistry*; D036103:Nanotechnology; D010720:Phosphines / Q000737:chemistry*; D045663:Quantum Dots / Q000737:chemistry*
chemical_list: D010720:Phosphines; C000613213:cobalt phosphide; D006108:Graphite; D006859:Hydrogen
keywords: cobalt phosphide; dynamic self-assembly; graphene quantum dots; hydrogen evolution; pristine graphene