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具有缺陷丰富的CoFe合金与工程碳支持,用于高性能可充电Zn-Air电池.

Geeta Pandurang Kharabe1,2, Sidharth Barik1,2, Arun Torris3

  • 1Physical & Materials Chemistry Division, CSIR-National Chemical Laboratory, Pune, Maharashtra, 411008, India.

Small (Weinheim an der Bergstrasse, Germany)
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在工程碳支上,一种富含缺陷的新型铁 (CoFe) 合金催化剂显著提高了可充电空气电池 (RZAB) 的性能,证明了优越的功率密度和循环稳定性.

关键词:
3D断层扫描 3D断层扫描在N-兴奋剂中,N-兴奋剂.合金封装结构结构的合金封装结构设备示范设备的演示.谷物界限 谷物界限 谷物界限氧气减少和进化反应的反应.可充电的空气电池可以充电.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 电化学 电化学 电化学
  • 储能 储能 储能 储能 储能 储能

背景情况:

  • 可充电的空气电池 (RZAB) 是有前途的储能设备,但它们的效率受到阴极催化剂性能的限制.
  • 开发先进的双功能电催化剂,用于氧降解 (ORR) 和氧演化 (OER) 反应,对于RZAB的进步至关重要.

研究的目的:

  • 为高性能RZABs合成具有缺陷丰富的CoFe合金催化剂,使用工程碳支.
  • 研究新型催化剂的结构,电子和电化学特性.
  • 用开发的催化剂来评估RZAB的性能.

主要方法:

  • 通过化石墨烯氧化物,和铁酸盐和胺,合成一个CoFe(2:1) / N-rGCNT催化剂.
  • 催化剂结构的表征,包括在现场形成Cofé合金封装的CNT和富含Fe的皮肤@CoFe合金装饰的NGr.
  • 对ORR和OER活动进行电化学测试,包括开始电位,半波电位和超电位测量.
  • 进行3DX射线微断层模拟,以评估空气透性和气体扩散.
  • 使用新型阴极的RZAB设备的制造和测试.

主要成果:

  • CoFe2:1) /N-rGCNT催化剂表现出极好的双功能活性,ORR发起潜力为955mV与RHE,半波潜力为835mV与RHE,OER超电位为340mV (ΔE = 0.73V).
  • 模拟表明由于催化剂的结构,空气透性和气体扩散性得到改善.
  • 使用CoFe2:1/N-rGCNT阴极的RZAB实现了171.3mW cm-2的峰值功率密度,其性能优于Pt/C阴极.
  • 该电池在10 mA cm−2处表现出稳定的放电概况,具体容量为650 mAh g−1Zn,并具有140小时的高速循环能力.

结论:

  • 具有工程碳支持的富含缺陷的CoFe合金催化剂提供了卓越的电催化活性和增强的RZAB性能.
  • 催化剂的独特结构,包括线路缺陷和提高的导电性,是其高性能的关键.
  • 这项工作为开发高效且耐用的可充电空气电池的先进阴极材料提供了有前途的途径.