FeCo nanoparticles wrapped in N-doped carbon derived from Prussian blue analogue and dicyandiamide as efficient oxygen reduction electrocatalysts for Al-air batteries
FeCo nanoparticles wrapped in N-doped carbon derived from Prussian blue analogue and dicyandiamide as efficient oxygen reduction electrocatalysts for Al-air batteries
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DOI：
10.1016/j.cej.2020.125158
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发表时间：
2020-09
影响因子：
15.1
通讯作者：
Lin Cui;Mingxing Chen;Ge Huo;Xianzhu Fu;Jingli Luo
中科院分区：
文献类型：
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作者：
Lin Cui;Mingxing Chen;Ge Huo;Xianzhu Fu;Jingli Luo
开发高活性、高耐久性、低成本的氧还原电催化剂对促进经济高效的铝-空气电池具有重要意义。本文以普鲁士蓝类似物和双氰胺为前驱体，采用低成本、简便的方法制备了FeCo纳米粒子修饰的氮掺杂碳。所得催化剂显示出显著的ORR活性，具有起始电位（0.981 V vs. RHE）和高半波电位（0.848 V vs. RHE），以及在碱性条件下优异的上级稳定性。这种优异的电催化性能可能是由于FeCo合金的多级孔结构和N掺杂石墨碳物种之间的协同作用。作为示范，将优化的催化剂用作Al-空气电池中的阴极催化剂，其显示出显著的放电性能，具有1.67 V的较高开路电压和98.62 mW cm-2的大功率密度，超过商业Pt/C电催化剂（1.65 V，90.81 mW cm-2），以及40 h（4次循环）的优异循环稳定性。该研究为探索可规模化的铝-空气电池先进催化剂提供了机会。
Developing highly active and durable electrocatalysts with low-cost for the oxygen reduction reaction (ORR) is of paramount importance for promoting economical and high-performance Al-air batteries. Herein, nitrogen-doped carbon decorated with FeCo nanoparticles catalysts is prepared by a low-cost and facile approach employed Prussian blue analogue and dicyandiamide as precursors. The obtained catalyst exhibits remarkable ORR activity with an onset potential (0.981 V vs. RHE) and a high half-wave potential (0.848 V vs. RHE), as well as superior stability in alkaline conditions. The outstanding electrocatalytic performance of electrocatalysts might be resulted from the hierarchical porous structure and synergetic effect between FeCo alloy and N-doped graphitic carbon species. As a demonstration, the optimized catalysts are employed as the cathode catalysts in a Al-air battery, which shows remarkable discharge performance with higher open-circuit voltage of 1.67 V and large power density of 98.62 mW cm−2which exceeding commercial Pt/C electrocatalysts (1.65 V, 90.81 mW cm−2), and exceptional cycle stability of 40 h (4 cycles). This work will provide a chance to explore scalable advanced catalysts in Al-air battery.