期刊
CHEMICAL ENGINEERING JOURNAL
卷 413, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2020.127954
关键词
Oxygen reduction reaction; g-C < sub > 3 <; sub > N < sub > 4 <; sub > nanotube; Oxygen evolution reaction; Bifunctional electrocatalyst; Co < sub > 4 <; sub > N nanoparticle
资金
- China Post-doctoral Science Foundation [2019M653608]
- Leading Talents of Innovation and Entrepreneurship of the Dongguan City [D2017(16)]
- Natural Science Foundation of Guangdong Province [2017A030310645]
- National Natural Science Foundation of China [51671136, 21805034]
- Startup Research Fund of Dongguan University of Technology [KCYKYQD2017015, KCYCXPT2017005]
This study reports a unique Co4N@CNNT bifunctional electrocatalyst with high catalytic activity and stability, providing a new strategy for the fabrication of efficient bifunctional electrocatalysts for OER and ORR.
Developing a cost-effective, efficient, and facile prepared electrocatalyst for oxygen reduction (ORR) and evolution reaction (OER) is critical for a range of renewable energy technologies. Herein, we report unique Co4N nanoparticles loading on g-C3N4 nanotubes (Co4N@CNNT) bifunctional electrocatalyst for OER and ORR by an in-situ method. Highly dispersed Co4N nanoparticles as the active sites gather at the top of the g-C3N4 nanotube (CNNT), while the six-fold cavities from smooth CNNT with an outer diameter of 48 nm and an inner diameter of 22 nm act as anchor sites to preferentially coordinate with the active sites. Benefiting from the distinctive structure features, the intrinsic metallic Co4N@CNNT exhibits high electrocatalytic performances. Electrochemistry studies show that an onset potential of 0.94 V and a half-wave potential of 0.86 V of Co4N@CNNT are obtained that are superior to Pt/C catalyst. A low overpotential of 285 mV at an anodic current density of 10 mA cm-2 during the OER process is obtained that is superior to the IrO2 catalyst; and lower Tafel plot and good durability are also observed. Our findings provide a new strategy for the fabrication of an efficient bifunctional electrocatalyst for OER and ORR.
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