催化作用
过电位
塔菲尔方程
双功能
电催化剂
纳米颗粒
碳纤维
硫黄
材料科学
化学工程
无机化学
化学
纳米技术
物理化学
电极
有机化学
电化学
复合材料
冶金
工程类
复合数
作者
Shaolong Zhang,Dong Zhai,Tingting Sun,Aijuan Han,Yanliang Zhai,Weng‐Chon Cheong,Yi Liu,Chenliang Su,Dingsheng Wang,Yadong Li
标识
DOI:10.1016/j.apcatb.2019.04.096
摘要
The oxygen reduction reaction (ORR) and hydrogen evolution reaction (HER) are critical processes for many energy conversion technologies, where efficient catalyst plays a key role in these reactions. Here we report a novel in situ strategy to embed Co9S8 nanoparticles (NPs) into nitrogen and sulfur codoped hollow porous carbon (Co9S8@N-S-HPC). In this strategy, the ZIF-8 surface is firstly decorated by cobalt thiourea, and then coated with a shell of polymeric resorcinol-formaldehyde, followed by a high temperature pyrolysis treatment. The resulting Co9S8@N-S-HPC shows comparable catalytic activity for ORR compared with commercial 20 wt% Pt/C catalyst and superior long-term stability under alkaline conditions. Simultaneously, Co9S8@N-S-HPC also exhibits an excellent HER activity with low onset overpotential of 68 mV, a small Tafel slope of 78 mV per decade and a long-term durability in alkaline medium. First-principles calculations reveal that Co9S8 particle can anchor in N-S-HPC via a Co-S bond and enhance the binding of Co9S8 and N-S-HPC. The N-S-HPC can affect the electronic structure of supported Co9S8 strongly. The combined experimental and theoretical investigation show the outstanding ORR and HER performances of Co9S8@N-S-HPC are attributed to its unique nanostructure and synergistic interactions between Co9S8 NPs and N-S-HPC.
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