Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 6, Issue 4, Pages 4499-4503Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.7b04732
Keywords
Ag; P doping; Hydrogen evolution; Electrocatalyst; Density functional theory
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Funding
- National Natural Science Foundation of China [21575137]
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Electrolytic hydrogen generation needs efficient and durable electrocatalysts for the hydrogen evolution reaction. In this Letter, for the first time, we report on the development of P-doped Ag nanoparticles embedded in N-doped carbon nanoflake (denoted as P-Ag(@NC) for effective hydrogen evolution electrocatalysis. When tested in 0.5 M H2SO4, such P-Ag@NC demands overpotential of only 78 mV to drive a catalytic current density of 10 mA cm(-2), which is 198 mV less than that of Ag@NC counterpart. Remarkably, this catalyst also shows strong long-term electrochemical durability with the preservation of its catalytic activity for at least 85 h. Density functional theory calculations suggest that P doping brings the optimization of hydrogen adsorption free energy to a more thermo-neutral value.
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