氮掺杂碳纳米片负载Fe-Co-Pt复合材料的制备及其氧还原电活性

Fabrication and oxygen reduction reaction electroactivity of Fe-Co-Pt loaded on nitrogen-doped carbon nanosheet composites

制备高活性和高稳定性的电催化剂复合材料一直是燃料电池与金属-空气电池的重要研究内容。以双氰胺作为碳氮源,通过酞菁钴和二茂铁提供金属纳米颗粒,对其混合物进行简单的高温热解得到负载铁钴合金的氮掺杂碳纳米片(Fe_(1)-Co_(1)-N/C);最后利用沉积法将少量铂引入到Fe_(1)-Co_(1)-N/C上,得到负载铂铁钴三金属合金的氮掺杂碳纳米片(Fe_(1)-Co_(1)-Pt-N/C)。酸性介质中催化剂的氧还原反应(ORR)测试结果表明,Fe_(1)-Co_(1)-N/C本身对ORR具有较强的电活性,而2.36%~3.58%铂的加入显著提升了催化剂的电催化性能,其ORR起始电位、半波电位和极限扩散电流均可与商业Pt/C(40%)媲美,且具有优异的稳定性,可作为氧还原催化剂良好的候选材料。

Preparation of electrocatalyst composites with high activity and stability is of great significance for the development of fuel cells and metal-air cells.In this study,nitrogen doped nanosheets loaded with Fe-Co alloy(Fe_(1)-Co_(1)-N/C)were firstly obtained by simple pyrolysis of the mixture composed of dicyandiamide as carbon and nitrogen sources,cobalt phthalocyanine and ferrocene as metal nanoparticles sources.Finally,a small amount of platinum was introduced into Fe_(1)-Co_(1)-N/C by a facile deposition method to obtain Pt-Fe-Co loaded nitrogen-doped carbon nanosheet composites(Fe_(1)-Co_(1)-Pt-N/C).Electroactivity of the prepared samples towards oxygen reduction reaction(ORR)in acidic medium was investigated.Results show that the Fe_(1)-Co_(1)-N/C itself displays a strong electroactivity for ORR.Further,the Fe_(1)-Co_(1)-Pt-N/C catalysts with Pt mass-loadings of 2.36%-3.58%present a significant improvement on ORR electrocatalytic performance.Their ORR onset potential,half-wave potential and limiting diffusion current are comparable to commercial Pt/C(40%).Also,they exhibit excellent electroactivity stability for ORR.The prepared catalyst in this work can be used as a good candidate material applied to fuel cells.