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Bimetallic NiCo Functional Graphene: An Efficient Catalyst for Hydrogen‐Storage Properties of MgH 2
Author(s) -
Wang Ying,
Liu Guang,
An Cuihua,
Li Li,
Qiu Fangyuan,
Wang Yijing,
Jiao Lifang,
Yuan Huatang
Publication year - 2014
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.201402245
Subject(s) - bimetallic strip , graphene , bimetal , hydrogen storage , materials science , catalysis , oxide , chemical engineering , nanocomposite , hydrogen , nanoparticle , nanotechnology , chemistry , metal , metallurgy , organic chemistry , alloy , engineering
Bimetallic NiCo functional graphene (NiCo/rGO) was synthesized by a facile one‐pot method. During the coreduction process, the as‐synthesized ultrafine NiCo nanoparticles (NPs), with a typical size of 4–6 nm, were uniformly anchored onto the surface of reduced graphene oxide (rGO). The NiCo bimetal‐supported graphene was found to be more efficient than their single metals. Synergetic catalysis of NiCo NPs and rGO was confirmed, which can significantly improve the hydrogen‐storage properties of MgH 2 . The apparent activation energy ( E a ) of the MgH 2 NiCo/rGO sample decreases to 105 kJ mol −1 , which is 40.7 % lower than that of pure MgH 2 . More importantly, the as‐prepared MgH 2 NiCo/rGO sample can absorb 5.5 and 6.1 wt % hydrogen within 100 and 350 s, respectively, at 300 °C under 0.9 MPa H 2 pressure. Further cyclic kinetics investigation indicates that MgH 2 NiCo/rGO nanocomposites have excellent cycle stability.