NiFeMo Nanoparticles Encapsulated within Nitrogen‐Doped Reduced Graphene Oxide as Bifunctional Electrocatalysts for Zinc‐Air Batteries,ChemElectroChem

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NiFeMo Nanoparticles Encapsulated within Nitrogen‐Doped Reduced Graphene Oxide as Bifunctional Electrocatalysts for Zinc‐Air Batteries
ChemElectroChem ( IF 3.5 ) Pub Date : 2020-12-17 , DOI: 10.1002/celc.202001475
Wenwen Zeng ₁ , Chaohui Wei ₁ , Kai Zeng ₁ , Xuecheng Cao ₂ , Mark H. Rümmeli _{1,

3,

4} , Ruizhi Yang ₁

Affiliation

Rechargeable metal‐air batteries (MABs) have emerged as promising candidates for portable energy storage technologies because of their favorable energy/power density, safety, and cost‐effectiveness. However, the lack of advanced bifunctional electrocatalysts for the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) restricts the commercial realization of rechargeable MABs. Herein, we developed a facile fabrication route to prepare N‐doped graphene oxide encapsulating nanoparticles of a ternary NiFe metal oxide (NiFeMo@N‐rGO) serving as an efficient bifunctional catalyst. The obtained NiFeMo@N‐rGO bifunctional catalyst demonstrates a comparable catalytic reactivity when compared to precious metal catalysts in alkaline electrolytes regarding ORR/OER performance (ORR: half‐wave potential of 0.82 V; OER: overpotential of 330 mV; ▵E: 0.73 V at 10 mA cm⁻²). The assembled zinc‐air batteries (ZABs) catalyzed by NiFeMo@N‐rGO exhibit a high power density of 120 mW cm⁻² and a capacity of 721 mAh g_Zn⁻¹, coupled with long‐term durability of over 200 h. This contribution paves a practical avenue to prepare efficient bifunctional catalysts for superior ZABs.

中文翻译：

NiFeMo纳米颗粒封装在氮掺杂的还原氧化石墨烯中，作为锌-空气电池的双功能电催化剂

可充电金属空气电池（MAB）由于具有良好的能量/功率密度，安全性和成本效益，已经成为便携式储能技术的有希望的候选者。但是，缺少用于氧还原反应（ORR）和氧释放反应（OER）的高级双功能电催化剂，限制了可再充电MAB的商业实现。在本文中，我们开发了一种简便的制备路线，以制备N掺杂的氧化石墨烯，以三元NiFe金属氧化物（NiFeMo @ N-rGO）的纳米颗粒的形式用作有效的双功能催化剂。与碱性电解液中的贵金属催化剂相比，所获得的NiFeMo @ N‐rGO双功能催化剂在ORR / OER性能方面具有可比的催化反应性（ORR：半波电势为0.82 V; OER：过电势为330 mV;▵E：^-2）。NiFeMo @ N-rGO催化的组装锌空气电池（ZAB）具有120 mW cm ^-2的高功率密度和721 mAh g _Zn^-1的容量，并具有超过200 h的长期耐久性。该贡献为制备用于高级ZAB的有效双官能催化剂铺平了实用途径。

更新日期：2021-02-01

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