Ultralow-content Pt nanodots/Ni 3 Fe nanoparticles: interlayer nanoconfinement synthesis and overall water splitting
Minimizing precious metal loading into electrocatalysts for water splitting is vital to promoting hydrogen energy technology toward practical applications. Low-content loading of precious-metal electrocatalysts is achieved by decorating precious metal nanostructures on co-electrocatalysts typically...
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Published in | Nanoscale Vol. 16; no. 15; pp. 7626 - 7633 |
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Main Authors | , , , , , |
Format | Journal Article |
Language | English |
Published |
England
18.04.2024
|
Online Access | Get full text |
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Summary: | Minimizing precious metal loading into electrocatalysts for water splitting is vital to promoting hydrogen energy technology toward practical applications. Low-content loading of precious-metal electrocatalysts is achieved by decorating precious metal nanostructures on co-electrocatalysts typically
surface confinement. Here, an electrocatalyst of ultralow-content Pt nanodots (0.71 wt%)/Ni
Fe nanoparticles on reduced oxidation graphene (Pt/Ni
Fe/rGO) is constructed for overall water splitting by pyrolyzing a single-source precursor PtCl
guest-intercalated MgNiFe-layered double hydroxide (MgNiFe-LDH) host
a distinctive interlayer confinement. Consequently, Pt/Ni
Fe/rGO demonstrates attractive overpotentials of 240 and 76 mV at 10 mA cm
for the oxygen and hydrogen evolution reactions (OER and HER), respectively, outperforming those of its /Ni
Fe/rGO counterpart. Moreover, the Pt/Ni
Fe/rGO∥Pt/Ni
Fe/rGO electrolyzer generates a current density of 10 mA cm
at 1.55 V, with a retention of 92.4% after 50 h. Furthermore, the measured specific activity and low transfer resistance, as well as the density functional theory (DFT) calculations, indicate that the active Pt/Ni
Fe in Pt/Ni
Fe/rGO can optimize the adsorption/desorption of reaction intermediates and thus boost OER/HER kinetics, all of which lead to enhanced performance. The results demonstrate that such an interlayer confinement-based synthesis strategy can allow for the design of cost-effective precious nanodots as potential electrocatalysts. |
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ISSN: | 2040-3364 2040-3372 |
DOI: | 10.1039/D4NR00029C |