用 MOF 前驱体制备高性能 Fe-N-C 电催化剂，用于锌空气电池的 ORR,Energy & Fuels

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用 MOF 前驱体制备高性能 Fe-N-C 电催化剂，用于锌空气电池的 ORR
Energy & Fuels ( IF 5.2 ) Pub Date : 2023-11-21 , DOI: 10.1021/acs.energyfuels.3c02983
Koorosh Firouz Tadavani ₁ , Mohammad Zhiani ₁ , Hussein Gharibi ₁ , Haideh Balali Dehkordi ₂

Affiliation

使用合适的非贵金属催化剂代替阴极中的 Pt/C 可以大规模开发金属-空气电池。这项工作成功地实现了通过热解过程从金属有机骨架前驱体生产铁基氮掺杂碳电催化剂（Fe-NC）。Fe-NC 电催化剂的 Brunauer-Emmett-Teller 分析显示出较大的表面积 (621 m ² g ^–1 )。X射线光电子能谱和拉曼结果证实了电催化剂结构中作为缺陷剂的氮物种的存在和多样性，并且活性位点诱导了惊人的氧还原反应，作为锌空气电池的有效阴极。在0.1 M KOH溶液中的电化学测试表明，氧还原阴极峰出现在0.897 V _RHE处。线性扫描伏安法显示出优异的起始电位（E _onset = 1.02 V _RHE）、半波电位（E _1/2 = 0.892 V _RHE）和极限电流密度（4.87 mA cm ^–2）。Fe-NC 电催化剂的耐久性测试表明，经过 10,000 次连续电位循环后，E _{1/2仅出现 22 mV 负移。}在锌-空气电池系统中，Fe-NC的开路电压和比容量分别为1.47 V和749 mA hg ^–1。由于合成的电催化剂具有可接受的氧还原活性，Fe-NC电催化剂可用于广泛的能源应用。

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Preparation of a High-Performance Fe–N–C Electrocatalyst from an MOF Precursor for ORR Toward Zinc–Air Batteries

Metal–air batteries can be developed on a large scale using suitable nonprecious metal catalysts to replace Pt/C in the cathode electrode. The production of an iron-based N-doped carbon electrocatalyst (Fe–NC) from a metal–organic framework precursor through the pyrolysis process was successfully achieved in this work. Brunauer–Emmett–Teller analysis of the Fe–NC electrocatalyst showed a large surface area (621 m² g^–1). X-ray photoelectron spectroscopy and Raman results confirmed the existence and variety of nitrogen species in the structure of the electrocatalyst as defect agents, and active sites induced astounding oxygen reduction reactions as efficient cathodes for zinc–air batteries. The electrochemical test in the 0.1 M KOH solution displayed that the oxygen reduction cathodic peak appeared at 0.897 V_RHE. The linear sweep voltammetry revealed excellent onset potential (E_onset = 1.02 V_RHE), half-wave potential (E_1/2 = 0.892 V_RHE), and limiting current density (4.87 mA cm^–2). The durability test of the Fe-NC electrocatalyst indicated only a 22 mV negative shift in the E_1/2 after 10,000 continuous potential cycles. The open circuit voltage and specific capacity of Fe–NC were 1.47 V and 749 mA h g^–1 in a Zn–air battery system, respectively. Due to the acceptable oxygen reduction activity of the synthesized electrocatalyst, the Fe–NC electrocatalyst can be used in a wide range of energy applications.

更新日期：2023-11-21

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