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Dispersed iron carbide nanoparticles confined in nitrogen and oxygen co-doped porous carbon framework as efficient electrocatalysts for zinc/air batteries
Journal of Electroanalytical Chemistry ( IF 4.5 ) Pub Date : 2020-09-01 , DOI: 10.1016/j.jelechem.2020.114369
Jingyuan Lai , Lang Gan , Kai Zhang , Jing Fang , Yanqing Lai , Jie Li

Abstract Exploiting highly effective and low-cost non-noble metal catalysts for metal/air batteries are still remain a great challenge. In this work, an “active site-framework” structure, namely iron carbide embedded in nitrogen and oxygen co-doped porous carbon framework (A-Fe3C@NO-PC), is successfully synthesized by a polydopamine-protection-assisted pyrolysis strategy. The as-prepared catalyst possesses excellent catalytic activity with a half-wave-potential of 0.85 V (vs. reversible hydrogen electrode) for oxygen reduction reaction. In addition, this A-Fe3C@NO-PC loaded zinc/air battery exhibits a negligible voltage gap increase after 300 continuous cycle tests (52 h) at the current density of 50 mA cm−2. The excellent catalytic performance of the catalyst is contributed to high electronic conductivity of Fe3C, high contents of pyridinic and graphitic-N doped porous carbon framework. The concept and achievement can inspire the development of the surface engineering to design other transition metal species decorated carbon catalysts for metal/air batteries.

中文翻译:

分散在氮氧共掺杂多孔碳骨架中的碳化铁纳米粒子作为锌/空气电池的有效电催化剂

摘要 开发用于金属/空气电池的高效低成本非贵金属催化剂仍然是一个巨大的挑战。在这项工作中,通过聚多巴胺保护辅助热解策略成功合成了一种“活性位点框架”结构,即嵌入氮氧共掺杂多孔碳框架(A-Fe3C@NO-PC)中的碳化铁。所制备的催化剂具有优异的催化活性,氧还原反应的半波电位为 0.85 V(相对于可逆氢电极)。此外,这种负载 A-Fe3C@NO-PC 的锌/空气电池在 50 mA cm-2 的电流密度下进行 300 次连续循环测试(52 小时)后,电压间隙的增加可以忽略不计。催化剂优异的催化性能有助于 Fe3C 的高电子电导率,高含量的吡啶和石墨-N 掺杂多孔碳骨架。这一概念和成果可以激发表面工程的发展,以设计用于金属/空气电池的其他过渡金属物种装饰的碳催化剂。
更新日期:2020-09-01
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