Journal
ACS CATALYSIS
Volume 8, Issue 9, Pages 8450-8458Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.8b02288
Keywords
platinum single atoms; porous carbon; photochemical solid-phase reduction; hydrogen evolution reaction; oxygen reduction reaction
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Funding
- National Natural Science Funds of China [51572013, 51432003]
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Currently, Pt single atoms as promising electrocatalysts have been applied to electrocatalysis aiming to significantly improve performance and remarkably lower usage of the noble metal. Herein, we propose a photochemical solid-phase reduction method to fabricate well-defined isolated Pt atoms on a nitrogen-doped porous carbon (Pt-1/NPC). Using this simple and fast synthesis strategy, the formed Pt atoms are well-dispersed on the carbon without clusters or nanoparticles. The loading of the Pt is up to 3.8 wt % relative to the carbon. The Pt-1/NPC catalyst displays an ultrahigh electrocatalytic activity for hydrogen evolution reaction with an overpotential of 25 mV at the current density of 10 mA cm(-2) and mass activity of 2.86 A mg(-1) Pt (24-times higher than a commercial Pt/C). Moreover, the catalyst also presents efficient catalytic activity for the oxygen reduction reaction. Its mass activity is 4.3-times that obtained by a commercial Pt (20 wt %). The improved electrocatalytic activities of the Pt-1/NPC catalyst are ascribed to the favorable chemical and electronic structure of the Pt-N-4 coordination raised by strong electron transfer from the isolated Pt atoms to the coordinated N atoms in this catalyst. The Pt-1/NPC can be employed as a bifunctional catalyst for fuel cells and hydrogen production.
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