Nitrogen-Doped Carbon Foam as a Highly Durable Metal-Free Electrocatalyst for the Oxygen Reduction Reaction in Alkaline Solution
Nitrogen-Doped Carbon Foam as a Highly Durable Metal-Free Electrocatalyst for the Oxygen Reduction Reaction in Alkaline Solution
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DOI：
10.1016/j.electacta.2016.10.090
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发表时间：
2016-12-01
影响因子：
6.6
通讯作者：
Lyth, Stephen M.
中科院分区：
文献类型：
--
作者：
Liu, Jianfeng;Cunning, Benjamin V.;Lyth, Stephen M.
使用二乙醇胺作为氮源，通过无模板、可扩展的燃烧技术合成具有大表面积的氮掺杂碳泡沫（CFN）。由此产生的大孔开孔泡沫具有微米级的空心孔，周围环绕着薄薄的石墨烯状壁。该材料用作碱性 KOH 溶液中氧还原反应 (ORR) 的无金属电催化剂。这种无金属电催化剂在半波电位下的活性仅比铂装饰碳（Pt/CB）低43 mV，但比市售含铁非贵重电催化剂（Pajarito Powder，PP）低87 mV，这表明铁对于实现最高活性非常重要。在超过 60,000 个电位循环的耐久性测试中，Pt/CB 和 PP 经历了显着的降解，而非贵重的 CFN 电催化剂的变化可以忽略不计，这表明与铂或铁相比，电化学活性位点具有较高的稳定性。因此，这种无金属催化剂作为特定碱性离子交换膜燃料电池（AEMFC）应用的电催化剂显示出巨大的前景，其中长寿命是最重要的。 (C) 2016 Elsevier Ltd. 保留所有权利。
Nitrogen-doped carbon foam (CFN) with large surface area is synthesized via a template-free, scalable combustion technique using diethanolamine as a nitrogen source. The resulting macroporous, open-cell foam has micron-scale hollow cells, surrounded by thin, graphene-like walls. This material is applied as a metal-free electrocatalyst for the oxygen reduction reaction (ORR) in alkaline KOH solution. The activity of this metal-free electrocatalyst at the half-wave potential is just 43 mV lower than that of platinum decorated carbon (Pt/CB), but 87 mV lower than a commercially available Fe-containing non-precious electrocatalyst (Pajarito Powder, PP), suggesting that iron is important in achieving the highest activities. In durability tests measured over 60,000 potential cycles, Pt/CB and PP undergo significant degradation, whilst the non-precious CFN electrocatalyst shows negligible change, indicating high stability of the electrochemical active sites compared with platinum or iron. Such metal-free catalysts therefore show great promise as electrocatalysts for specific alkaline ion exchange membrane fuel cell (AEMFC) applications where long lifetimes are most important. (C) 2016 Elsevier Ltd. All rights reserved.