Controlled synthesis of hollow micro/meso-pore nitrogen-doped carbon with tunable wall thickness and specific surface area as efficient electrocatalysts for oxygen reduction reaction
Controlled synthesis of hollow micro/meso-pore nitrogen-doped carbon with tunable wall thickness and specific surface area as efficient electrocatalysts for oxygen reduction reaction
复制标题
可控合成壁厚和比表面积可调的中空微/介孔氮掺杂碳作为氧还原反应的高效电催化剂
DOI：
10.1039/c5ta09859a
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发表时间：
2016
影响因子：
11.9
通讯作者：
Wei Zidong
中科院分区：
文献类型：
--
作者：
Wu Rui;Chen Siguo;Zhang Yuanliang;Wang Yao;Nie Yao;Ding Wei;Qi Xueqiang;Wei Zidong
制备了具有可调壁厚和比表面积的中空微孔/介孔氮掺杂碳（HMNC），以评价HMNC电催化剂的结构对电催化活性的影响。HMNC的壁厚和比表面积可以通过简单地调节吸附在前驱体上的Fe含量来精确控制。优化后的HMNC催化剂壁厚为5 nm，比表面积为1703.5 m2 g·h-1，在碱性介质中表现出优异的氧还原性能，甚至优于Pt/C催化剂，开发高活性、低成本的氧还原催化剂是实现燃料电池大规模商业化的关键。尽管铂和铂基合金仍然是ORR的最有效的催化剂，但铂的高昂成本和稀缺性严重阻碍了它们的广泛应用。3-5因此，几十年来一直在努力探索用于ORR的无铂催化剂以取代贵重的铂，以将这种有效的技术带入真实的应用。6-10在这方面，氮掺杂的碳（NC）材料由于其低成本、环境友好性、高电催化选择性和良好的耐久性而代表作为用于ORR的无金属催化剂的重要候选者。尽管通过仔细选择合适的前体和优化纳米结构化工艺获得了一些显著的成就，但所报道的无金属NC催化剂的ORR性能仍然劣于现有技术的Pt/C催化剂。16为了使NC催化剂真正与铂基催化剂竞争，
Hollow micro/meso-pore nitrogen-doped carbon (HMNC) with tunable wall thickness and speci c surface area was prepared to evaluate the structural effect of HMNC electrocatalysts on the electrocatalytic activity. The wall thickness and speci c surface area of HMNC can be precisely controlled by simply adjusting the Fe content adsorbed on the precursor. The optimized HMNC catalyst with $5 nm wall thickness and 1703.5 m2 g À1 speci c surface area shows excellent ORR performance in alkaline media, even better than the performance of the Pt/C catalyst.Developing highly active and cost-effective catalysts for oxygen reduction reaction (ORR) is crucial for achieving largescale commercialization of fuel cells. 1, 2 Although platinum and platinum-based alloys are still the most efficient catalysts for ORR, the prohibitive cost and scarcity of platinum signi cantly hinder their broad applications. 3–5 As such, intensive efforts to explore platinum-free catalysts for ORR to replace the precious platinum have been going on for several decades to bring this efficient technology into real applications. 6–10 In this respect, nitrogen-doped carbon (NC) materials represent important candidates as metal-free catalysts for ORR because of their low cost, environmental friendliness, high electrocatalytic selectivity and good durability. 11–15 In spite of some signi cant achievements attained by the careful selection of suitable precursors and the optimization of the nanostructuring process, the ORR performance of the reported metal-free NC catalysts is still inferior to that of the stateof-the-art Pt/C catalyst. 16 To make NC catalysts truly competitive with platinum-based catalysts, two crucial factors that govern