TY - JOUR
T1 - Engineering Platinum–Cobalt Nano-alloys in Porous Nitrogen-Doped Carbon Nanotubes for Highly Efficient Electrocatalytic Hydrogen Evolution
AU - Zhang, Song Lin
AU - Lu, Xue Feng
AU - Wu, Zhi-Peng
AU - Luan, Deyan
AU - Lou, Xiong Wen (David)
PY - 2021/8/23
Y1 - 2021/8/23
N2 - Highly efficient electrocatalysts are essential for the production of green hydrogen from water electrolysis. Herein, a metal-organic framework-assisted pyrolysis-replacement-reorganization approach is developed to obtain ultrafine Pt-Co alloy nanoparticles (sub-10 nm) attached on the inner and outer shells of porous nitrogen-doped carbon nanotubes (NCNT) with closed ends. During the thermal reorganization, the migration of Pt-Co nano-alloys to both surfaces ensures the maximized exposure of active sites while maintaining the robust attachment to the porous carbon matrix. Density functional theory calculations suggest a nearly thermodynamically-neutral free energy of adsorption for hydrogen intermediates and diversified active sites induced by alloying, thus resulting in a great promotion in intrinsic activity towards the hydrogen evolution reaction (HER). Benefiting from the delicate structural design and compositional modulation, the optimized Pt3Co@NCNT electrocatalyst manifests outstanding HER activity and superior stability in both acidic and alkaline media. © 2021 Wiley-VCH GmbH
AB - Highly efficient electrocatalysts are essential for the production of green hydrogen from water electrolysis. Herein, a metal-organic framework-assisted pyrolysis-replacement-reorganization approach is developed to obtain ultrafine Pt-Co alloy nanoparticles (sub-10 nm) attached on the inner and outer shells of porous nitrogen-doped carbon nanotubes (NCNT) with closed ends. During the thermal reorganization, the migration of Pt-Co nano-alloys to both surfaces ensures the maximized exposure of active sites while maintaining the robust attachment to the porous carbon matrix. Density functional theory calculations suggest a nearly thermodynamically-neutral free energy of adsorption for hydrogen intermediates and diversified active sites induced by alloying, thus resulting in a great promotion in intrinsic activity towards the hydrogen evolution reaction (HER). Benefiting from the delicate structural design and compositional modulation, the optimized Pt3Co@NCNT electrocatalyst manifests outstanding HER activity and superior stability in both acidic and alkaline media. © 2021 Wiley-VCH GmbH
KW - alloys
KW - cobalt
KW - N-doped carbon nanotube
KW - platinum
KW - thermal reorganization
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UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-85110675353&origin=recordpage
U2 - 10.1002/anie.202106547
DO - 10.1002/anie.202106547
M3 - RGC 21 - Publication in refereed journal
C2 - 34137497
SN - 1433-7851
VL - 60
SP - 19068
EP - 19073
JO - Angewandte Chemie - International Edition
JF - Angewandte Chemie - International Edition
IS - 35
ER -
