CuCoOx/FeOOH Core–Shell Nanowires as an Efficient Bifunctional Oxygen Evolution and Reduction Catalyst,ACS Energy Letters

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CuCoOx/FeOOH Core–Shell Nanowires as an Efficient Bifunctional Oxygen Evolution and Reduction Catalyst
ACS Energy Letters ( IF 19.3 ) Pub Date : 2017-10-02 00:00:00 , DOI: 10.1021/acsenergylett.7b00835
Min Kuang ₁ , Qihao Wang ₁ , Hongtao Ge ₁ , Peng Han ₁ , Zhengxiang Gu ₁ , Abdullah M. Al-Enizi ₂ , Gengfeng Zheng ₁

Affiliation

The rational design of active and durable reversible oxygen electrocatalysts plays a key role in renewable energy conversion and storage. Here we developed copper and cobalt-based oxide/iron hydroxide hybrid nanowire arrays (CuCoO_x/FeOOH) via a three-step growth–annealing–conversion approach. These hybrid nanowires offer a large surface area for electrocatalytic sites, abundant pores for fast electrolyte access, efficient charge transfer, and strong coupling between CuCoO_x and FeOOH components. Attributed to these features, the CuCoO_x/FeOOH nanowires exhibit excellent bifunctional oxygen evolution reaction and oxygen reduction reaction activities, including low overpotentials, high current densities, and outstanding stabilities. Using the CuCoO_x/FeOOH electrocatalyst as the oxygen electrode, a rechargeable zinc–air battery was fabricated to exhibit a small charge–discharge overpotential (0.75 V at 10 mA·cm^–2) and a long-term cycling stability (150 cycles), thus suggesting new bifunctional electrocatalysts for energy conversion and storage applications.

中文翻译：

CuCoO _x / FeOOH核壳纳米线作为一种高效的双功能氧释放和还原催化剂

活性和持久性可逆氧气电催化剂的合理设计在可再生能源的转换和存储中起着关键作用。在这里，我们通过三步生长-退火-转化方法开发了铜和钴基氧化物/氢氧化铁杂化纳米线阵列（CuCoO _x / FeOOH）。这些杂化纳米线为电催化部位提供了较大的表面积，为快速进入电解质提供了充足的孔，有效的电荷转移，以及CuCoO _x和FeOOH组分之间的强耦合。归因于这些特征，CuCoO _x / FeOOH纳米线表现出出色的双功能氧释放反应和氧还原反应活性，包括低超电势，高电流密度和出色的稳定性。使用CuCoO _x/ FeOOH电催化剂作为氧电极，制造了可充电的锌-空气电池，以表现出较小的充放电过电势（在10 mA·cm ^–2时为0.75 V ）和长期循环稳定性（150个循环），因此建议采用新型用于能量转换和存储应用的双功能电催化剂。

更新日期：2017-10-02

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