MOF衍生的Fe-N-C电催化剂,用于高效氧还原反应

MOF-derived Fe-N-Celectrocatalyst forefficient oxygen reduction reactions

由于传统能源的大量消耗与环境污染等问题,探索高效清洁的新型能源显的越来越重要。锌空电池作为一种绿色清洁能源受到了广泛的关注,然而其阴极氧还原(ORR)反应较为缓慢限制了其大规模应用。因此开发一种高效、绿色经济的非贵金属催化剂对氧还原反应至关重要。以金属-有机骨架(MOF)作为前驱体,通过高温热解合成了铁基氮掺杂碳电催化剂(Fe-N-C)。Fe-N-C催化剂由于其较强的金属-氮配位结构可以避免金属原子的聚集和溶解,使金属原子均匀分散在氮掺杂的碳载体上,实现较高的ORR性能。制备的Fe-N-C-2催化剂具有丰富的孔隙结构和大量的Fe-N X活性位点。其在碱性电解质中半波电位为0.91 V,在酸性电解质中半波电位为0.75 V。同时将其应用于锌空电池具有高达1.47 V的开路电压和163.1 mW/cm^(2)的功率密度。该策略为设计二维结构以构建高性能电催化剂提供了一种有前途的方法。

Due to the large consumption of traditional energy and environmental pollution,it is more and more important to explore efficient and clean new energy sources.Zinc-empty battery has been widely concerned as a kind of green and clean energy,but its slow cathodic oxygen reduction(ORR)reaction limits its large-scale application.Therefore,it is very important to develop an efficient and green economic non-precious metal catalyst for oxygen reduction reaction.In this paper,metal-organic framework(MOF)is used as the precursor,Fe-N doped carbon electrocatalyst(Fe-N-C)was synthesized by high temperature pyrolysis.Fe-N-C catalyst can avoid the aggregation and dissolution of metal atoms due to its strong metal-nitrogen coordination structure,so that the metal atoms are uniformly dispersed on the nitrogen-doped carbon carrier,and achieve high ORR performance.The prepared Fe-N-C-2 catalyst has abundant pore structure and a large number of Fe-N X active sites.The half-wave potential is 0.91 V in alkaline electrolyte and 0.75 V in acidic electrolyte.At the same time,it is applied to zinc-air batteries with an open circuit voltage of up to 1.47 V and a power density of 163.1 mW/cm^(2).This strategy provides a promising approach for designing two-dimensional structures to construct high-performance electrocatalysts.