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FeCo Nanoparticles Encapsulated in N-Doped Carbon Nanotubes Coupled with Layered Double (Co, Fe) Hydroxide as an Efficient Bifunctional Catalyst for Rechargeable Zinc–Air Batteries
Small ( IF 13.3 ) Pub Date : 2021-09-22 , DOI: 10.1002/smll.202103737
Tongrui Zhang 1, 2, 3 , Juanjuan Bian 3, 4 , Yuanqin Zhu 1 , Chunwen Sun 1, 2, 3, 4
Affiliation  

Low-cost bifunctional nonprecious metal catalysts toward oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) are critical for the commercialization of rechargeable zinc–air batteries (ZABs). However, the preparation of highly active and durable bifunctional catalysts is still challenging. Herein, an efficient catalyst is reported consisting of FeCo nanoparticles embedded in N-doped carbon nanotubes (FeCo NPs-N-CNTs) by an in situ catalytic strategy. Due to the encapsulation and porous structure of N-doped carbon nanotubes, the catalyst shows high activity toward ORR and excellent durability. Furthermore, to enhance the OER activity, CoFe-layer double hydroxide (CoFe-LDH) is coupled with FeCo NPs-N-CNTs by in situ reaction approach. As the air electrode for rechargeable ZABs, the cell with CoFe-LDH@FeCo NPs-N-CNTs catalyst exhibits high open-circuit potential (OCP) of 1.51 V, high power density of 116 mW cm−2, and remarkable durability up to 100 h, demonstrating its great promise for the practical application of the rechargeable ZABs.

中文翻译:

封装在 N 掺杂碳纳米管中的 FeCo 纳米颗粒与层状双 (Co, Fe) 氢氧化物结合作为可充电锌空气电池的高效双功能催化剂

用于氧还原反应 (ORR) 和析氧反应 (OER) 的低成本双功能非贵金属催化剂对于可充电锌空气电池 (ZAB) 的商业化至关重要。然而,制备高活性和耐用的双功能催化剂仍然具有挑战性。在此,报道了一种有效的催化剂,该催化剂由通过原位催化策略嵌入 N 掺杂碳纳米管 (FeCo NPs-N-CNTs) 中的 FeCo 纳米颗粒组成。由于N掺杂碳纳米管的包封和多孔结构,该催化剂对ORR表现出高活性和优异的耐久性。此外,为了提高 OER 活性,CoFe 层双氢氧化物 (CoFe-LDH) 通过原位反应方法与 FeCo NPs-N-CNTs 偶联。作为可充电 ZAB 的空气电极,−2,以及长达 100 小时的卓越耐久性,证明了其在可充电 ZAB 的实际应用中的巨大前景。
更新日期:2021-11-04
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