简易浸渍吸附法制备缺陷型碳纤维负载CoO及其氧双效催化性能研究

A Simple Impregnated Adsorption Strategy to Prepare Defective Carbon Fibers Supported CoO for Bifunctional Oxygen Electrocatalysis

设计并制备成本低、活性高且稳定性好的氧反应双效催化剂对于燃料电池、金属空气电池等先进储能系统的运行意义重大。首次以自制的缺陷型碳纤维(CNFs-D)为碳前驱体,通过简易浸渍吸附热处理联用法成功合成了CNFs-D/CoO复合催化剂。采用扫描电子显微镜、X射线衍射等技术表征材料的形貌、结构和表面特性,同时采用循环伏安、线性扫描等方法测试材料的氧催化性能。研究发现:相比于其它对比样,所合成的CNFs-D/CoO复合催化剂具有更加优异的氧双效催化性能。这种优异的氧催化性能主要归因于CNFs-D前驱体具有更大的比表面积、更高的缺陷度以及与钴源更强的相互作用所致。本工作所采用的催化剂合成方法为过渡金属化合物/碳复合催化剂的设计提供了一种新的思路。

Design and preparation of bi-functional oxygen electrocatalysts with low cost,high activity and good stability proves much important for the application of advanced energy storage systems(including fuel cells and metal-air batteries).In this work,home-made defective carbon fibers(CNFs-D)/CoO hybrid electrocatalyst is successfully prepared by a simple impregnated adsorption method followed by pyrolysis process using CNFs-D as carbon precursor.Scanning electron microscope,X-ray diffraction and other techniques are employed to detect the morphology,structure and surface property of the obtained samples.Meanwhile,cyclic voltammetry,linear sweep voltammetry and other methods are used to measure the catalytic performance of the obtained samples.The results show that the as-prepared CNFs-D/CoO hybrid electrocatalyst shows much better bi-functional oxygen catalytic performance when compared to other comparison samples.And this excellent oxygen catalytic performance is mainly due to the fact that CNFs-D possesses larger specific surface area,higher defect degree and stronger interaction with cobalt source.Our adopted preparation strategy offers a good example for the design of transition metal compound/carbon hybrid electrocatalysts.