Key Laboratory of Energy Material Chemistry, Ministry of Education, Key Laboratory of Advanced Functional Materials, Autonomous Region, Institute of Applied Chemistry, Xinjiang University, Urumqi 830046, Xinjiang, PR China.
Key Laboratory of Energy Material Chemistry, Ministry of Education, Key Laboratory of Advanced Functional Materials, Autonomous Region, Institute of Applied Chemistry, Xinjiang University, Urumqi 830046, Xinjiang, PR China.
J Colloid Interface Sci. 2018 Mar 15;514:656-663. doi: 10.1016/j.jcis.2017.12.081. Epub 2017 Dec 29.
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, approximate four-electron selectivity as ORR catalyst, a potential of 0.842 V at 10 mA cm. Specifically, the CoFe@NCNTs present a Tafel slope of 60.16 mV dec as OER catalyst and the variance (ΔE) is below 1.017 V in 0.1 M KOH for the OER and ORR.
探索高效且廉价的氧还原反应（ORR）和氧析出反应（OER）双功能催化剂对于开发燃料电池和金属空气电池至关重要。氮掺杂碳和过渡金属（Fe 或 Co）由于协同效应被证明是一种很有前途的催化剂。在这项工作中，通过一步退火前驱体，无需任何模板，合成了负载在氮掺杂碳纳米管上的 CoFe 合金纳米粒子（CoFe@NCNTs）。所制备的材料在碱性溶液中对 ORR 和 OER 表现出非凡的电催化活性：-5.53 mA cm 的扩散电流密度，作为 ORR 催化剂时具有近似的四电子选择性，在 10 mA cm 时的电位为 0.842 V。具体而言，CoFe@NCNTs 作为 OER 催化剂的塔菲尔斜率为 60.16 mV dec，在 0.1 M KOH 中 OER 和 ORR 的方差（ΔE）低于 1.017 V。
