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首页> 外文期刊>Advanced energy materials >A Triphasic Bifunctional Oxygen Electrocatalyst with Tunable and Synergetic Interfacial Structure for Rechargeable Zn-Air Batteries
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A Triphasic Bifunctional Oxygen Electrocatalyst with Tunable and Synergetic Interfacial Structure for Rechargeable Zn-Air Batteries

机译：具有可调和协同界面结构的可充电锌空气电池的三相双功能氧气电催化剂

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摘要

Atomic-scale design of interfacial structure is an intriguing but challenging approach to developing efficient heterogenous catalysts for bifunctional oxygen electrocatalysis. Herein, an exquisite triphasic interfacial structure featuring the encapsulation of FexNi alloy in a graphitic shell with a partial exposure of the FeOy thin-layered surface is manipulated via an electronic modulation strategy. The spontaneous integration of well-crystallized metal alloy, carbon shell with a tunable active FeOy layer, not only guarantees smooth charge transfer across the thin oxide layer, but also generates the synergistic effect at the interface, thus dramatically boosting the intrinsic activity of oxygen catalysis. Benefiting from these attributes, the hybrid catalyst outperforms the commercial noble-metal benchmarks with a higher half-wave potential of 0.890 V for oxygen reduction reaction and lower overpotential of 308 mV at 10 mA cm(-2) for the oxygen evolution reaction in alkaline media. Beyond that, a high-performance rechargeable Zn-air battery is realized with a narrow voltage gap of 0.742 V and excellent cyclability over 500 cycles at 10 mA cm(-2), demonstrating the great potential of the as-developed triphasic electrocatalyst for practical applications.
机译：界面结构的原子尺度设计是开发用于双功能氧电催化的高效多相催化剂的一种有趣而具有挑战性的方法。在此，通过电子调制策略来操纵精美的三相界面结构，其特征在于将FexNi合金封装在石墨壳中，并部分暴露FeOy薄层表面。良好结晶的金属合金，具有可调活性FeOy层的碳壳的自发整合，不仅保证了电荷在薄氧化层上的平稳转移，而且在界面处产生了协同效应，从而显着增强了氧催化的内在活性。 。得益于这些特性，杂化催化剂的氧气还原反应的半波电势较高，为0.890 V，而碱性溶液中的氧气析出反应的半波电势较低，为308 mV，优于传统的贵金属基准。媒体。除此之外，它还实现了一种高性能可充电Zn-空气电池，该电池具有0.742 V的窄电压间隙，在10 mA cm（-2）的500个循环中具有出色的可循环性，证明了已开发的三相电催化剂具有很大的实用价值。应用程序。

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