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首页> 外文期刊>Catalysis science & technology >Anchoring of ultrafine Co3O4 nanoparticles on MWCNTs using supercritical fluid processing and its performance evaluation towards electrocatalytic oxygen reduction reaction
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Anchoring of ultrafine Co3O4 nanoparticles on MWCNTs using supercritical fluid processing and its performance evaluation towards electrocatalytic oxygen reduction reaction

机译：锚定的超细Co3O4纳米颗粒使用超临界流体处理和热合其绩效评估对electrocatalytic氧还原反应

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摘要

Developing an efficient electrocatalyst for improving oxygen reduction reaction (ORR) kinetics is essential for various renewable energy appliances and energy-intensive technologies. The design of a low cost and robust ORR catalyst with desired durability still remains a challenging task. Here we demonstrated a facile and environmentally friendly supercritical fluid-assisted decoration of Co3O4 on multi-walled carbon nanotubes (MWCNTs) to generate a hybrid nanostructure electrocatalyst for ORR. The mildly oxidized MWCNTs provided functional groups on the outer walls to seed and anchor nanocrystals, while keeping the inner walls intact for a highly conducting network. In particular, the 11 wt% Co3O4-MWCNTs hybrid exhibited improved half wave potential by 240 mV compared to Co3O4 and 125 mV with respect to MWCNTs based on the rotating ring disc voltammetry results. Similarly, the observed ORR current density was superior to those of both bulk Co3O4 and bare MWCNTs at medium overpotential, proceeding dominantly through a 4-electron reduction pathway. Such enhancement may be attributed to the synergetic effect of the specific heterogeneous architecture, which results in improved conductivity, accessible active centres and enhanced reaction rate at Co3O4 decorated on the MWCNT surface.
机译：开发一个高效electrocatalyst改善氧还原反应(ORR)为各种可再生动力学是至关重要的能源设备和能源密集型技术。奥尔催化剂与所需的耐久性仍然是一个具有挑战性的任务。简单和环境友好超临界fluid-assisted Co3O4装饰在多壁碳纳米管(热合)生成一个混合纳米结构electrocatalyst奥尔。种子和官能团的外墙锚纳米晶体,同时保持内部墙壁完好无损的高度进行网络。11 wt % Co3O4-MWCNTs混合表现出改进的半波电位240 mV相比Co3O4和125 mV与尊重热合基于旋转环盘伏安法的结果。电流密度是优越的大部分Co3O4和裸露的碳管为媒介通过一个超电势,占优势4电还原途径。可能归因于的协同作用的效果特定的异构体系结构,这结果改进的电导率,可访问活性中心和提高反应速度Co3O4 MWCNT表面装饰。

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