Facile in situ fabrication of Co nanoparticles embedded in 3D N-enriched mesoporous carbon foam electrocatalyst with enhanced activity and stability toward oxygen reduction reaction
Facile in situ fabrication of Co nanoparticles embedded in 3D N-enriched mesoporous carbon foam electrocatalyst with enhanced activity and stability toward oxygen reduction reaction
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轻松原位制造嵌入 3D 富氮介孔碳泡沫电催化剂的 Co 纳米颗粒，具有增强的氧还原反应活性和稳定性
DOI：
10.1007/s10853-018-03255-0
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发表时间：
2019-01
期刊：
影响因子：
--
通讯作者：
Yong Hu
中科院分区：
文献类型：
--
作者：
Chunyang Xu;Zheng Lin;Dian Zhao;Yulin Sun;Yijun Zhong;Jiqiang Ning;Changcheng Zheng;Ziyang Zhang;Yong Hu
氧还原反应（oxygenreduction reaction，ORR）是各种能量转换和储存装置的关键反应，但其反应动力学缓慢和贵金属的使用限制了其在实际装置中的应用。本文以四水合乙酸钴和2，2 ′-联吡啶-5，5 ′-二甲酸（H2 bpydc）为原料，以H2 bpydc为原位氮掺杂和金属钴还原的有利碳源和氮源，采用一步Co-MOF碳化法制备了一种高性能的催化剂。所得的具有嵌入的Co纳米颗粒的3D介孔碳泡沫催化剂（CoN-CF）富含氮，其表现出高的比表面积和丰富的用于催化ORR的N掺杂活性位点。特别是，优化的CoN-CF-700样品显示出最好的催化性能，包括0.94 V的起始电位，0.85 V的半波电位，长期耐用性和上级的抗甲醇中毒性。所展示的合成策略为金属-N-C催化剂的易合成和高经济路线提供了新的见解，并加深了对微观结构对催化机理的影响的理解。
Oxygen reduction reaction (ORR) is a crucial reaction for various energy conversion and storage devices, but the sluggish kinetics and the usage of noble metals greatly restrict its practical device applications. In this work, a well-designed high-performance catalyst for ORR was synthesized via a facile one-step Co-MOF carbonization method, in which Co-MOF was prepared using the cobalt acetate tetrahydrate and 2,2′-bipyridyl-5,5′-dicarboxylic acid (H2bpydc) as the only raw materials and H2bpydc as the favorable carbon and nitrogen source for in situ nitrogen doping and metallic cobalt reduction. The resultant 3D mesoporous carbon foam catalyst with embedded Co nanoparticles (CoN–CF) is enriched with nitrogen, which exhibits high specific surface area and abundant N-doping active sites for catalytic ORR. In particular, the optimized CoN–CF-700 sample displays the best catalytic performances including onset potential of 0.94 V, half-wave potential of 0.85 V, long-term durability and superior resistance to methanol poisoning. The demonstrated synthetic strategy provides a new insight into easy-synthesis and high-economy routes for metal–N–C catalysts and a deeper understanding of the effects of microstructures on catalytic mechanisms.
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