Renewable and metal-free carbon nanofibre catalysts for carbon dioxide reduction
Renewable and metal-free carbon nanofibre catalysts for carbon dioxide reduction
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DOI：
10.1038/ncomms3819
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发表时间：
2013-12-01
影响因子：
16.6
通讯作者：
Salehi-Khojin, Amin
中科院分区：
文献类型：
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作者：
Kumar, Bijandra;Asadi, Mohammad;Salehi-Khojin, Amin
开发一种高效的催化剂体系将二氧化碳电化学还原为高能量产品是一个重要的研究课题。在这里，我们报道了聚丙烯腈基杂原子碳纳米纤维催化二氧化碳还原为一氧化碳的能力，通过一种不含金属的、可再生的和经济有效的途径。在相同的实验条件下，碳纳米纤维催化剂对二氧化碳还原的过电位可以忽略不计(0.17V)，电流密度比银催化剂高一个数量级以上。碳纳米纤维的二氧化碳还原能力归因于还原的碳，而不是电负性的氮原子。优异的性能归功于纳米纤维结构和关键中间体对碳纳米纤维表面的高结合能。这一发现可能会导致新一代无金属和非贵金属催化剂，其效率比现有的贵金属催化剂高得多。
The development of an efficient catalyst system for the electrochemical reduction of carbon dioxide into energy-rich products is a major research topic. Here we report the catalytic ability of polyacrylonitrile-based heteroatomic carbon nanofibres for carbon dioxide reduction into carbon monoxide, via a metal-free, renewable and cost-effective route. The carbon nanofibre catalyst exhibits negligible overpotential (0.17 V) for carbon dioxide reduction and more than an order of magnitude higher current density compared with the silver catalyst under similar experimental conditions. The carbon dioxide reduction ability of carbon nanofibres is attributed to the reduced carbons rather than to electronegative nitrogen atoms. The superior performance is credited to the nanofibrillar structure and high binding energy of key intermediates to the carbon nanofibre surfaces. The finding may lead to a new generation of metal-free and non-precious catalysts with much greater efficiency than the existing noble metal catalysts.