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Modular Iron–Bipyridine-Based Conjugated Aerogels as Catalysts for Oxygen Reduction Reaction
ACS Catalysis ( IF 11.3 ) Pub Date : 2023-10-25 , DOI: 10.1021/acscatal.3c03998 Leigh Peles-Strahl 1, 2 , Hilah C. Honig 1 , Yeela Persky 1 , David A. Cullen 3 , Adi Dahan 2 , Lior Elbaz 1
ACS Catalysis ( IF 11.3 ) Pub Date : 2023-10-25 , DOI: 10.1021/acscatal.3c03998 Leigh Peles-Strahl 1, 2 , Hilah C. Honig 1 , Yeela Persky 1 , David A. Cullen 3 , Adi Dahan 2 , Lior Elbaz 1
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Aerogels have a large surface area and a porous structure, which make them an attractive catalyst support materials for fuel cells. Modifying the aerogels’ building blocks and introducing catalytic sites into their backbones allow them to function as both catalysts and supports, thereby increasing the density and distribution of catalyst active sites. In this work, we studied conjugated aerogels containing iron–bipyridine catalytic sites for the oxygen reduction reaction. To demonstrate the variation in physical and electrochemical properties of these aerogels, a series of aerogels were synthesized by a Glaser coupling reaction. Iron salt was added to the three-dimensional gel to produce iron–bipyridine complexes and obtain atomically dispersed catalytic sites. The electrocatalytic activity and electrical conductivity of the aerogels were increased after their heat treatment to yield Fe-doped carbon aerogels. The control of metal loadings was accomplished by changing the bipyridine content during the aerogel synthesis, resulting in 0.9–4.1 wt % Fe. The results show a correlation between Fe loading, aerogel structure, and catalytic activity, achieving high performance for the oxygen reduction reaction in both acidic and alkaline media.
中文翻译：
模块化铁-联吡啶基共轭气凝胶作为氧还原反应的催化剂
气凝胶具有大的表面积和多孔结构，这使其成为燃料电池有吸引力的催化剂载体材料。修改气凝胶的结构单元并将催化位点引入其主链中，使它们既可以充当催化剂又可以充当载体，从而增加了催化剂活性位点的密度和分布。在这项工作中，我们研究了含有铁联吡啶催化位点的氧还原反应的共轭气凝胶。为了证明这些气凝胶物理和电化学性质的变化，通过格拉泽偶联反应合成了一系列气凝胶。将铁盐添加到三维凝胶中以产生铁-联吡啶络合物并获得原子分散的催化位点。气凝胶的电催化活性和电导率在热处理后得到增加，产生铁掺杂碳气凝胶。通过改变气凝胶合成过程中联吡啶的含量来控制金属负载量，得到 0.9-4.1 wt% Fe。结果显示了铁负载量、气凝胶结构和催化活性之间的相关性，在酸性和碱性介质中实现了高性能的氧还原反应。
更新日期：2023-10-27
中文翻译：
模块化铁-联吡啶基共轭气凝胶作为氧还原反应的催化剂
气凝胶具有大的表面积和多孔结构，这使其成为燃料电池有吸引力的催化剂载体材料。修改气凝胶的结构单元并将催化位点引入其主链中，使它们既可以充当催化剂又可以充当载体，从而增加了催化剂活性位点的密度和分布。在这项工作中，我们研究了含有铁联吡啶催化位点的氧还原反应的共轭气凝胶。为了证明这些气凝胶物理和电化学性质的变化，通过格拉泽偶联反应合成了一系列气凝胶。将铁盐添加到三维凝胶中以产生铁-联吡啶络合物并获得原子分散的催化位点。气凝胶的电催化活性和电导率在热处理后得到增加，产生铁掺杂碳气凝胶。通过改变气凝胶合成过程中联吡啶的含量来控制金属负载量，得到 0.9-4.1 wt% Fe。结果显示了铁负载量、气凝胶结构和催化活性之间的相关性，在酸性和碱性介质中实现了高性能的氧还原反应。
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