Bimetallic Hollow Tubular NiCoO_x as a Bifunctional Electrocatalyst for Enhanced Oxygen Reduction and Evolution Reaction

Abstract

The development of high-efficiency oxygen electrocatalysts with earth-abundant transition metals rather than scarce noble metals has aroused growing interests due to their potential for energy storage and conversion applications. Herein, we developed a facile strategy to synthesize hollow tubular bimetallic Ni–Co oxide rooted with dense nanosheets for enhanced bifunctionality and facilitated redox reaction kinetics. Owing to the rational design of morphology and well-dispersed Ni and Co ions, the bimetallic samples exhibit admirable bifunctional electrocatalytic activities. This bimetallic Ni–Co oxide shows superior oxygen electrocatalytic performance in comparison with the monometallic Ni and Co oxides, according to the electrocatalytic synergistic effect from the bimetallic system. The optimized sample with the specific mass ratio of Ni and Co displays the oxygen reduction reaction (ORR) property comparable to commercial Pt/C and oxygen evolution reaction (OER) performance superior to commercial RuO2. The electrochemical tests and structural characterizations offer in-depth dissection on the electrocatalytic behaviors, especially the superb stability in both ORR and OER tests, as well as the outstanding resistance to methanol poisoning, representing a promising candidate in the renewable energy field.

2D Materials for All‐Solid‐State Lithium Batteries

“…By the application of MoS 2 , the ASSLBs exhibits 675.8 mA h g −1 initial capacity and 584.1 mA h g −1 final capacity at 0.4 mA cm −2 , and after 200 cycles, MoS 2 ASSLBs fade by 13.58%, while ASSLBs without MoS 2 fade 27.3% (Figure 4e). [127,128]…”

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Boron Nitride- and Graphene-Supported Trimetallic Yolk–Shell and Hollow Nanoparticles

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