An effective bifunctional electrocatalysts: Controlled growth of CoFe alloy nanoparticles supported on N-doped carbon nanotubes

作者：Ma, Xuejia; Chai, Hui^*; Cao, Yali; Xu, Jiayu; Wang, Yucheng; Dong, Hong; Jia, Dianzeng; Zhou, Wanyong

来源：Journal of Colloid and Interface Science, 2018, 514: 656-663.

DOI：10.1016/j.jcis.2017.12.081

• Bi-functional
• Electrocatalysts
• Doped carbon
• CoFe alloy nanoparticles

Exploring efficient and inexpensive bi-functional catalysts for the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) is a critical work for developing the fuel cells and the metal-air batteries. Nitrogen-doped carbon and transition metal (Fe or Co) has been demonstrated as promising catalyst due to the synergetic effect. In this work, the CoFe alloy nanoparticles supported on N-doped carbon nanotubes (CoFe@NCNTs) are synthetized by one-step annealing the precursors, without any templates. The as-prepared materials show both extraordinary electrocatalysis activity for ORR and OER in alkaline solution: a diffusion current density of -5.53 mA cm(-2), approximate four-electron selectivity as ORR catalyst, a potential of 0.842 V at 10 mA cm(-2). Specifically, the CoFe@NCNTs present a Tafel slope of 60.16 mV dec(-1) as OER catalyst and the variance (Delta E) is below 1.017 V in 0.1 M KOH for the OER and ORR.

• 出版日期2018-3-15
• 单位中国科学院长春应用化学研究所; 新疆大学