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Development of efficient, affordable, non-precious metal oxides catalysts is critical for the oxygen evolution reaction (OER). Herein, we present a spinel NiCo 2 O 4 nanowire arrays (NWAs), synthesized by a simple solution route, as an inexpensive, efficient anode electrocatalyst for water electrolysis. The as-prepared NiCo 2 O 4 NWAs contains Ni 2+ /Ni 3+ which replace Co in octahedral sites of the spinel Co 3 O 4 , exhibiting higher catalytic activity than that of Co 3 O 4 and NiO. The enhanced catalytic activity of NiCo 2 O 4 NWAs is correlated with a large surface area, one-dimensional (1D) architecture, high conductivity and synergistic behavior of Ni/Co bifunctional catalyst. Besides, oxygen vacancies, which favor efficient electrons transport, supply more active sites, and assist in the adsorption of OH − , can be conducive to make high utilization of catalytic materials in the OER. Moreover, the magnetic properties of NiCo 2 O 4 NWAs are also investigated in detail. The results indicate that NiCo 2 O 4 NWAs could be a promising economical and environmentally benign bifunctional electrocatalyst for water splitting and other applications. |
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