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Hierarchical Nanoporous V2O3 Nanosheets Anchored with Alloy Nanoparticles for Efficient Electrocatalysis
journal contribution
posted on 2019-10-09, 16:44 authored by Haitao Xu, Li Liu, Jiaojiao Gao, Peng Du, Gang Fang, Hua-Jun QiuExploring
low-cost bifunctional electrocatalysts for efficient
water splitting still faces arduous challenges. Herein, a general
and straightforward method is developed to prepare 3D hierarchical
nanoporous V2O3 nanosheets anchored with different
alloy nanoparticles by adopting metal-ion-doped zinc–vanadium
(oxy)hydroxides as precursors. To demonstrate this concept, we produced
nanoporous V2O3 nanosheets dotted with NiFe
alloy nanoparticles through high-temperature reduction and free corrosion.
Due to the increased number of active sites, accelerated mass transfer
originating from the designed nanoporous architecture, and the metallic
property of the V2O3 matrix, the NiFe@V2O3 hybrid exhibits excellent electrocatalytic performances
for both oxygen and hydrogen evolution reactions. When adopting the
NiFe@V2O3 as a bifunctional electrode for overall
water splitting, it only requires a cell voltage of 1.56 V to reach
10 mA cm–2. This work provides a general and practical
way to prepare high-efficient and low-cost electrocatalysts.