Abdelwahab Abdalla, Carrasco-Marín Francisco, Pérez-Cadenas Agustín F
Materials Science and Nanotechnology Department, Faculty of Postgraduate Studies for Advanced Sciences, Beni-Suef University, Beni-Suef 62511, Egypt.
Carbon Materials Research Group, Department of Inorganic Chemistry, Faculty of Sciences, University of Granada, Campus Fuentenueva s/n, 18071 Granada, Spain.
Materials (Basel). 2020 Aug 10;13(16):3531. doi: 10.3390/ma13163531.
A series of carbon xerogels doped with cobalt, nickel, and iron have been prepared through the sol-gel method. The doped carbon xerogels were further functionalized with binary and ternary transition metal oxides containing Co, Ni, and Zn oxides by the hydrothermal method. A development in the mesopore volume is achieved for functionalized carbon xerogel doped with iron. However, in the functionalization of carbon xerogel with ternary metal oxides, a reduction in pore diameter and mesopore volume is found. In addition, all functionalized metal oxides/carbon are in the form of 3D nanobundles with different lengths and widths. The prepared samples have been tested as electrocatalysts for oxygen reduction reaction (ORR) in basic medium. All composites showed excellent oxygen reduction reaction activity; the low equivalent series resistance of the Zn-Ni-Co/Co-CX composite was especially remarkable, indicating high electronic conductivity. It has been established that the role of Zn in this type of metal oxides nanobundles-based ORR catalyst is not only positive, but its effect could be enhanced by the presence of Ni.
通过溶胶-凝胶法制备了一系列掺杂钴、镍和铁的碳干凝胶。通过水热法，用含有钴、镍和锌氧化物的二元和三元过渡金属氧化物对掺杂的碳干凝胶进行进一步功能化。对于掺杂铁的功能化碳干凝胶，其介孔体积有所增加。然而，在用三元金属氧化物对碳干凝胶进行功能化时，发现孔径和介孔体积减小。此外，所有功能化的金属氧化物/碳均呈具有不同长度和宽度的三维纳米束形式。所制备的样品已作为碱性介质中氧还原反应（ORR）的电催化剂进行了测试。所有复合材料均表现出优异的氧还原反应活性；Zn-Ni-Co/Co-CX复合材料的低等效串联电阻尤为显著，表明其具有高电子导电性。已经确定，锌在这种基于金属氧化物纳米束的ORR催化剂中的作用不仅是积极的，而且镍的存在可以增强其效果。
