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CoFe Nanoalloys Encapsulated in N-Doped Graphene Layers as a Pt-Free Multifunctional Robust Catalyst: Elucidating the Role of Co-Alloying and N-Doping
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2018-08-17 00:00:00 , DOI: 10.1021/acssuschemeng.8b01861
Barun Kumar Barman 1 , Karuna Kar Nanda 1
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2018-08-17 00:00:00 , DOI: 10.1021/acssuschemeng.8b01861
Barun Kumar Barman 1 , Karuna Kar Nanda 1
Affiliation
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Pt is known to be a state-of-the-art catalyst for oxygen reduction reaction (ORR) and hydrogen evolution reaction (HER), while it can also be used for the hydrogenation of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP). The quest is ongoing to find a suitable catalyst to circumvent the problems associated with the precious metal Pt. Here, we report a facile and green strategy to fabricate CoFe nanoalloys encapsulated in N-doped graphene layers (CoxFe1–x@N-G) by pyrolysis and their catalytic activity toward ORR, HER, and hydrogenation of 4-NP. Intensive studies have been carried out to elucidate the roles of alloying and N-doping. The catalytic activity is found to improve with increasing amounts of Co in the CoFe core and N-doping in the graphene layers. A similar onset potential with better current density as compared to the state-of-the-art Pt/C catalyst in alkaline medium has been achieved for CoxFe1–x@N-G toward ORR activity. These catalysts also show efficient and highly stable HER activity and are very efficient and magnetically separable in the hydrogenation of 4-NP to 4-AP. Overall, the non-precious-metal alloy nanostructures can be exploited as multifunctional catalysts in fuel cells, hydrogen storage systems, and wastewater treatment.
中文翻译：
CoFe纳米合金作为无Pt多功能鲁棒催化剂封装在N掺杂的石墨烯层中：阐明了共合金和N掺杂的作用
已知铂是用于氧还原反应（ORR）和析氢反应（HER）的最先进催化剂，同时也可用于将4-硝基苯酚（4-NP）加氢成4-氨基苯酚（4-AP）。寻求寻找合适的催化剂来规避与贵金属Pt相关的问题的探索正在进行中。在这里，我们报告了一种简便而绿色的策略来制造封装在N掺杂石墨烯层中的CoFe纳米合金（Co x Fe 1– x（NG）的热解及其对ORR，HER和4-NP氢化的催化活性。已经进行了深入的研究以阐明合金化和N掺杂的作用。发现催化活性随着CoFe核中Co的增加和石墨烯层中的N掺杂而提高。与碱性介质中最新的Pt / C催化剂相比，具有相同的起始电位和更好的电流密度，对于Co x Fe 1– x@NG指向ORR活动。这些催化剂还显示出高效且高度稳定的HER活性，并且在4-NP加氢成4-AP的过程中非常高效且可磁分离。总体而言，非贵金属合金纳米结构可以用作燃料电池，储氢系统和废水处理中的多功能催化剂。
更新日期：2018-08-17
中文翻译：
CoFe纳米合金作为无Pt多功能鲁棒催化剂封装在N掺杂的石墨烯层中：阐明了共合金和N掺杂的作用
已知铂是用于氧还原反应（ORR）和析氢反应（HER）的最先进催化剂，同时也可用于将4-硝基苯酚（4-NP）加氢成4-氨基苯酚（4-AP）。寻求寻找合适的催化剂来规避与贵金属Pt相关的问题的探索正在进行中。在这里，我们报告了一种简便而绿色的策略来制造封装在N掺杂石墨烯层中的CoFe纳米合金（Co x Fe 1– x（NG）的热解及其对ORR，HER和4-NP氢化的催化活性。已经进行了深入的研究以阐明合金化和N掺杂的作用。发现催化活性随着CoFe核中Co的增加和石墨烯层中的N掺杂而提高。与碱性介质中最新的Pt / C催化剂相比，具有相同的起始电位和更好的电流密度，对于Co x Fe 1– x@NG指向ORR活动。这些催化剂还显示出高效且高度稳定的HER活性，并且在4-NP加氢成4-AP的过程中非常高效且可磁分离。总体而言，非贵金属合金纳米结构可以用作燃料电池，储氢系统和废水处理中的多功能催化剂。
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