期刊
ADVANCED MATERIALS
卷 33, 期 5, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202007525
关键词
bifunctional oxygen catalysts; direct magnetic enhancement; macroporous carbon nanofibers; magnetic catalytic nanocages; rechargeable Zn– air batteries
类别
资金
- National Natural Science Foundation of China [51702047]
- National Key R&D Program of China [SQ2018YFC 200227]
- State Administration of Science, Technology and Industry for National Defence of China [JCKY2018203c035]
- Shanghai Rising-Star Program [20QA1400600]
The carbon-based magnetic catalytic nanocages can enhance oxygen catalytic activity under an external magnetic field, improving catalytic efficiency significantly. Compared to commercial catalysts, the magnetic catalyzed Zn-air batteries show higher capacities and longer durability, pointing towards a promising strategy of utilizing electromagnetic induction to boost oxygen catalysis.
Designing stable and efficient electrocatalysts for both oxygen reduction and evolution reactions (ORR/OER) at low-cost is challenging. Here, a carbon-based bifunctional catalyst of magnetic catalytic nanocages that can direct enhance the oxygen catalytic activity by simply applying a moderate (350 mT) magnetic field is reported. The catalysts, with high porosity of 90% and conductivity of 905 S m(-1), are created by in situ doping metallic cobalt nanodots (approximate to 10 nm) into macroporous carbon nanofibers with a facile electrospinning method. An external magnetic field makes the cobalt magnetized into nanomagnets with high spin polarization, which promote the adsorption of oxygen-intermediates and electron transfer, significantly improving the catalytic efficiency. Impressively, the half wave-potential is increased by 20 mV for ORR, and the overpotential at 10 mA cm(-2) is decreased by 15 mV for OER. Compared with the commercial Pt/C+IrO2 catalysts, the magnetic catalyzed Zn-air batteries deliver 2.5-fold of capacities and exhibit much longer durability over 155 h. The findings point out a very promising strategy of using electromagnetic induction to boost oxygen catalytic activity.
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