Doped porous carbon nanostructures as non-precious metal catalysts prepared by amino acid glycine for oxygen reduction reaction
Doped porous carbon nanostructures as non-precious metal catalysts prepared by amino acid glycine for oxygen reduction reaction
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DOI：
10.1016/j.apcatb.2017.04.039
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发表时间：
2017-08-15
影响因子：
22.1
通讯作者：
Park, Kyung-Won
中科院分区：
文献类型：
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作者：
Choi, In-Ae;Kwak, Da-Hee;Park, Kyung-Won
为了替代用于聚合物电解质膜燃料电池中的氧还原反应的Pt基催化剂，已经研究了由过渡金属和杂原子掺杂的各种碳纳米结构。在本研究中，我们以甘氨酸为掺杂剂和碳源，在铁盐存在下合成了双峰多孔铁和氮掺杂碳纳米结构作为非贵金属催化剂。样品表现出由分别为500和20 nm的大孔和中孔组成的双峰多孔结构，比表面积为214-740 m（2）g（-1），由于增加的电化学活性位点和有利的传质，这有利于电化学反应。此外，多孔碳纳米结构显示出相当数量的掺杂剂，高结晶度和优异的导电性。特别地，使用500和20 nm二氧化硅珠与甘氨酸和铁盐制备的样品在酸性和碱性介质中均显示出与商业Pt催化剂相当的改进的催化活性。(C)2017爱思唯尔B. V.保留所有权利。
To replace Pt-based catalysts for oxygen reduction reactions in polymer electrolyte membrane fuel cells, various carbon nanostructures doped by transition metals and heteroatoms have been investigated. In this study, we synthesized bi-modal porous iron and nitrogen doped carbon nanostructures as non precious metal catalysts using glycine as a dopant and carbon source in the presence of iron salt. The samples exhibited a bi-modal porous structure consisting of macro- and meso-pores of 500 and 20 nm, respectively, and specific surface areas of 214-740 m(2) g(-1), which facilitate electrochemical reactions due to increased amounts of electrochemical active sites and favorable mass transport. Furthermore, the porous carbon nanostructures showed considerable amounts of dopants, high crystallinity, and excellent electrical conductivity. Especially, the sample prepared using 500 and 20 nm silica beads with both glycine and iron salt showed improved catalytic activity in both acidic and alkaline media comparable to that of a commercial Pt catalyst. (C) 2017 Elsevier B.V. All rights reserved.