Oxygen Vacancies Dominated NiS2/CoS2 Interface Porous Nanowires for Portable Zn–Air Batteries Driven Water Splitting Devices,Advanced Materials

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Oxygen Vacancies Dominated NiS2/CoS2 Interface Porous Nanowires for Portable Zn–Air Batteries Driven Water Splitting Devices
Advanced Materials ( IF 27.4 ) Pub Date : 2017-11-02 , DOI: 10.1002/adma.201704681
Jie Yin ₁ , Yuxuan Li ₁ , Fan Lv _{2,

3,

4} , Min Lu ₁ , Ke Sun ₁ , Wei Wang ₁ , Lei Wang ₅ , Fangyi Cheng ₆ , Yefei Li ₇ , Pinxian Xi ₁ , Shaojun Guo _{2,

3,

4}

Affiliation

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 (NiS₂/CoS₂–O NWs) for boosting OER catalysis through in situ electrochemical reaction of NiS₂/CoS₂ 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⁻² and remarkable long‐term stability in 1.0 m KOH. The home‐made rechargeable portable Zn–air batteries by using NiS₂/CoS₂–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 NiS₂/CoS₂–O NWs as both anode and cathode, powered by two‐series‐connected NiS₂/CoS₂–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.

中文翻译：

用于便携式Zn-空气电池驱动的水分解装置的NiS2 / CoS2界面多孔纳米线中的氧空位

高活性和稳定的析氧反应（OER）电催化剂的开发对于提高水分解和金属空气电池装置的效率至关重要。在本文中，展示了一种有效的策略，可以使氧空位占主导地位的钴-镍硫化物界面多孔纳米线（NiS ₂ / CoS ₂ -O NWs）通过NiS ₂ / CoS ₂界面NWs的原位电化学反应来增强OER催化作用。由于存在大量的氧空位和界面多孔纳米线结构，因此它们可以有效地催化OER，在j = 10 mA cm ^-2时具有235 mV的低过电势，并且在1.0 m内具有显着的长期稳定性KOH。使用NiS ₂ / CoS ₂ -O NW作为空气阴极的自制可充电便携式Zn-空气电池显示出1.49 V的非常高的开路电压，可以维持30小时以上。最重要的是，设计了一种高效的自驱动式水分解装置，以NiS ₂ / CoS ₂ -O NW作为阳极和阴极，并由基于两个串联的NiS ₂ / CoS ₂ -O NWs的便携式Zn-air驱动电池。本工作为设计氧空位占主导的界面纳米线开辟了一条新途径，作为一种用于电化学反应和可再生能源设备的高效多功能电催化剂。

更新日期：2017-11-02

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