Abdelwahab Abdalla, Castelo-Quibén Jesica, Vivo-Vilches José F, Pérez-Cadenas María, Maldonado-Hódar Francisco J, Carrasco-Marín Francisco, Pérez-Cadenas Agustín F
Carbon Materials Research Group, Department of Inorganic Chemistry, Faculty of Sciences, University of Granada, Campus Fuentenueva s/n, ES18071-Granada, Spain.
Department of Inorganic and Technical Chemistry, Science Faculty, UNED, Paseo Senda del Rey 9, ES28040-Madrid, Spain.
Nanomaterials (Basel). 2018 Apr 23;8(4):266. doi: 10.3390/nano8040266.
A series of carbon aerogels doped with iron, cobalt and nickel have been prepared. Metal nanoparticles very well dispersed into the carbon matrix catalyze the formation of graphitic clusters around them. Samples with different Ni content are obtained to test the influence of the metal loading. All aerogels have been characterized to analyze their textural properties, surface chemistry and crystal structures. These metal-doped aerogels have a very well-developed porosity, making their mesoporosity remarkable. Ni-doped aerogels are the ones with the largest surface area and the smallest graphitization. They also present larger mesopore volumes than Co- and Fe-doped aerogels. These materials are tested as electro-catalysts for the oxygen reduction reaction. Results show a clear and strong influence of the carbonaceous structure on the whole electro-catalytic behavior of the aerogels. Regarding the type of metal doping, aerogel doped with Co is the most active one, followed by Ni- and Fe-doped aerogels, respectively. As the Ni content is larger, the kinetic current densities increase. Comparatively, among the different doping metals, the results obtained with Ni are especially remarkable.
已制备出一系列掺杂铁、钴和镍的碳气凝胶。很好地分散在碳基体中的金属纳米颗粒催化其周围石墨簇的形成。获得了具有不同镍含量的样品，以测试金属负载量的影响。对所有气凝胶进行了表征，以分析其结构性质、表面化学和晶体结构。这些金属掺杂气凝胶具有非常发达的孔隙率，使其介孔率显著。镍掺杂气凝胶是表面积最大且石墨化程度最小的气凝胶。它们的介孔体积也比钴和铁掺杂气凝胶大。这些材料作为氧还原反应的电催化剂进行了测试。结果表明，碳质结构对气凝胶的整体电催化行为有明显且强烈的影响。关于金属掺杂类型，钴掺杂气凝胶是最具活性的，其次分别是镍和铁掺杂气凝胶。随着镍含量增加，动力学电流密度增大。相比之下，在不同的掺杂金属中，镍获得的结果尤为显著。
