Porous FeCo Glassy Alloy as Bifunctional Support for High‐Performance Zn‐Air Battery
Porous FeCo Glassy Alloy as Bifunctional Support for High‐Performance Zn‐Air Battery
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DOI：
10.1002/aenm.202002204
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发表时间：
2020-12
影响因子：
27.8
通讯作者：
Fuping Pan;Z. Li;Zhenzhong Yang;Q. Ma;Maoyu Wang;Han Wang;M. Olszta;Guanzhi Wang;Zhenxing Feng;Yingge Du;Yang Yang-Yang
中科院分区：
文献类型：
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作者：
Fuping Pan;Z. Li;Zhenzhong Yang;Q. Ma;Maoyu Wang;Han Wang;M. Olszta;Guanzhi Wang;Zhenxing Feng;Yingge Du;Yang Yang-Yang
锌空气电池(ZAB)以其高安全性和优异的性能受到越来越多的关注。然而，ZAB的实际应用在很大程度上依赖于开发耐用的支撑材料来取代传统的碳载体，因为传统的碳载体存在不可恢复的腐蚀问题，严重危及ZAB的性能。本论文开发了一种新型的多孔FeCo玻璃合金作为ZAB的双功能催化载体。多孔玻璃合金的导电骨架被用来稳定氧还原助催化剂，更重要的是，FeCo是析氧的主相。为了展示催化玻璃合金载体的概念，超小的Pd纳米颗粒作为氧还原活性中心锚定在ZAB的多孔FeCo(记为Pd/FeCo)上。在碱性介质中，Pd/FeCo对氧还原(半波电位为0.85V)和析氧(电位为1.55V，达到10 mA cm−2)表现出明显的电催化活性。在ZAB中使用时，Pd/FeCo的输出功率密度为117mW cm−2，循环稳定性超过200h(400次循环)，超过了传统的碳负载铂/C+IrO2催化剂。这种将高活性成分与多孔结构相结合的集成设计为开发新型纳米结构电催化剂提供了一种新的策略。
The Zn‐air battery (ZAB) is attracting increasing attention due to its high safety and preeminent performance. However, the practical application of ZAB relies heavily on developing durable support materials to replace conventional carbon supports which have unrecoverable corrosion issues, severely jeopardizing ZAB performance. Herein, a novel porous FeCo glassy alloy is developed as a bifunctional catalytic support for ZAB. The conducting skeleton of the porous glassy alloy is used to stabilize oxygen reduction cocatalysts, and more importantly, the FeCo serves as the primary phase for oxygen evolution. To demonstrate the concept of catalytic glassy alloy support, ultrasmall Pd nanoparticles are anchored, as oxygen reduction active sites, on the porous FeCo (noted as Pd/FeCo) for ZAB. The Pd/FeCo exhibits a significantly improved electrocatalytic activity for oxygen reduction (a half‐wave potential of 0.85 V) and oxygen evolution (a potential of 1.55 V to reach 10 mA cm−2) in the alkaline media. When used in the ZAB, the Pd/FeCo delivers an output power density of 117 mW cm−2 and outstanding cycling stability for over 200 h (400 cycles), surpassing the conventional carbon‐supported Pt/C+IrO2 catalysts. Such an integrated design that combines highly active components with a porous architecture provides a new strategy to develop novel nanostructured electrocatalysts.