Directional Growth and Density Modulation of Single-Atom Platinum for Efficient Electrocatalytic Hydrogen Evolution.
Angew Chem Int Ed Engl
; 63(34): e202406650, 2024 Aug 19.
Article
en En
| MEDLINE
| ID: mdl-38818631
ABSTRACT
Dispersion of single atoms (SAs) in the host is important for optimizing catalytic activity. Herein, we propose a novel strategy to tune oxygen vacancies in CeO2-X directionally anchoring the single atom platinum (PtSA), which is uniformly dispersed on the rGO. The catalyst's performance for the hydrogen evolution reaction (HER) can be enhanced by controlling different densities of CeO2-X in rGO. The PtSA performs best optimally densified and loaded on homogeneous and moderately densified CeO2-X/rGO (PtSA-M-CeO2-X/rGO). It exhibited higher activity in HER with an overpotential of 25â
mV at 0.5â
M H2SO4 and 33â
mV at 1 KOH than that of almost reported electrocatalysts. Furthermore, it exhibited stability for 90â
hours at -100â
mA cm-2 in 1 KOH and -150â
mA cm-2 in 0.5â
M H2SO4 conditions, respectively. Through comprehensive experiments and theoretical calculations, the suitable dispersion density of PtSA on the defects of CeO2-X with more active sites gives the potential for practical applications. This research paves the way for developing single-atom catalysts with exceptional catalytic activity and stability, holding promise in advanced green energy conversion through defects engineering.
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Angew Chem Int Ed Engl
Año:
2024
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Article