Design and synthesis of pomegranate-like Co3O4@ZIF-8nano-electrocatalysts for oxygen reduction/evolution reactions
- 分享到:
摘要：
金属有机框架材料(Metal-organic frameworks,MOFs)具有结构丰富可调和组分多元有序的重要特点,被广泛应用于能源存储、催化材料等领域.目前大多数报道集中在将MOFs作为前驱体,对其进行高温煅烧处理,从而制备MOFs衍生电催化剂,其中高温过程容易导致有序孔道结构破坏、催化活性组分损失等问题.通过原位自组装MOFs合成策略,成功制备了Co3O4@ZIF-8复合纳米材料,该材料可直接作为有效的氧还原/氧析出双功能催化材料.实验结果表明,该复合催化材料保留了ZIF-8的多孔框架结构,而Co3O4纳米粒子则作为活性组分呈“石榴籽”状稳定分散在ZIF-8的内部.将其作为可充式锌-空气电池催化剂,在5 mA·cm-2的恒压充放电循环条件下进行电池性能测试,测试结果表明,该锌-空气电池可稳定循环100 h以上,并且过程中没有明显电压降,表现出良好的催化活性和稳定性.该研究为新型双功能催化材料设计合成提供了新的思路,也为免煅烧MOFs衍生电催化材料的研究发展提供了实验依据.
Metal-organic frameworks(MOFs)have received widespread applications in energy storage,catalytic materials and other fields owing to the significant characteristics of adjustable architectures,multivariate ordered components etc.Over the years,various reports focus on the MOFs derived electrocatalysts preparations by calcining MOF precursors at high temperature.However,high temperature processes will easily lead to the destruction of ordered pores structures as well as the loss of catalytic active components.In this paper,pomegranate-like Co3O4@ZIF-8 electrocatalyst was prepared by using in situ self-assemble strategy for the sake of effectively catalyzing both the oxygen reduction and evolution.Morphology characterizations exhibit that the porous framework of ZIF-8 is retained,besides Co3O4nanoparticles as active components are stably dispersed in the interior of ZIF-8 with the shape ofpomegranate seeds.The pomegranate-like Co3O4@ZIF-8 was further used as the cathode catalyst in zinc-air battery and testing at 5 mA·cm-2,showing that the battery can be cycled over 100 h without visible voltage losses during both discharged and charged processes.This study provides a neoteric idea for the design and synthesis of novel bifunctional catalytic materials and also establishes an experimental basis for the development of electrocatalytic materials derived from MOFs without calcination.
作者：
白正宇 秦金 张琰 原洋
Bai Zhengyu;Qin Jin;Zhang Yan;Yuan Yang(School of Chemistry and Chemical Engineering,Henan Normal University,Xinxiang 453007,China)
机构地区：
betway官方app 化学化工学院
出处：
《betway官方app 学报：自然科学版》 CAS 北大核心 2021年第4期60-67,F0002,共9页
基金：
国家自然科学基金(51922008 51872075) 国家111引智计划项目(D17007).
关键词：
双功能电催化剂 氧还原反应 氧析出反应 金属有机骨架 锌-空气电池
bifunctional electrocatalysts oxygen reduction reaction oxygen evolution reaction metal-organic frameworks zinc-air battery
分类号：
O413 [理学—理论物理]
