Oxygen Vacancies Dominated NiS<sub>2</sub> /CoS<sub>2</sub> Interface Porous Nanowires for Portable Zn-Air Batteries Driven Water Splitting Devices.
basic_science · Level V
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- Record sourced from PubMed, PMID 29239518.
- Also identified by DOI 10.1002/adma.201704681.
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Abstract
The development of highly active and stable oxygen evolution reaction (OER) electrocatalysts is crucial for improving the efficiency of water splitting and metal-air battery devices. Herein, an efficient strategy is demonstrated for making the oxygen vacancies dominated cobalt-nickel sulfide interface porous nanowires (NiS<sub>2</sub> /CoS<sub>2</sub> -O NWs) for boosting OER catalysis through in situ electrochemical reaction of NiS<sub>2</sub> /CoS<sub>2</sub> interface NWs. Because of the abundant oxygen vacancies and interface porous nanowires structure, they can catalyze the OER efficiently with a low overpotential of 235 mV at j = 10 mA cm<sup>-2</sup> and remarkable long-term stability in 1.0 m KOH. The home-made rechargeable portable Zn-air batteries by using NiS<sub>2</sub> /CoS<sub>2</sub> -O NWs as the air-cathode display a very high open-circuit voltage of 1.49 V, which can maintain for more than 30 h. Most importantly, a highly efficient self-driven water splitting device is designed with NiS<sub>2</sub> /CoS<sub>2</sub> -O NWs as both anode and cathode, powered by two-series-connected NiS<sub>2</sub> /CoS<sub>2</sub> -O NWs-based portable Zn-air batteries. The present work opens a new way for designing oxygen vacancies dominated interface nanowires as highly efficient multifunctional electrocatalysts for electrochemical reactions and renewable energy devices.