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Cho, Jaephil
Nano Energy Storage Materials Lab (NESM)
Research Interests
  • Li-ion battery, metal-air battery, redox-flow battery, flexible battery .

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Nanocarbon electrocatalysts for oxygen reduction in alkaline media for advanced energy conversion and storage

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Title
Nanocarbon electrocatalysts for oxygen reduction in alkaline media for advanced energy conversion and storage
Author
Li, QingCao, RuiguoCho, JaephilWu, Gang
Keywords
Alkaline media; Electrocatalysis; Fuel cells; Metal-air batteries; Oxygen reduction
Issue Date
201404
Publisher
WILEY-V C H VERLAG GMBH
Citation
ADVANCED ENERGY MATERIALS, v.4, no.6, pp.1301415 -
Abstract
Alkaline oxygen electrocatalysis, targeting anion exchange membrane fuel cells, Zn-air batteries, and alkaline-based Li-air batteries, has become a subject of intensive investigation because of its advantages compared to its acidic counterparts in reaction kinetics and materials stability. However, significant breakthroughs in the design and synthesis of efficient oxygen reduction catalysts from earth-abundant elements instead of precious metals in alkaline media remain in high demand. Carbon composite materials have been recognized as the most promising because of their reasonable balance between catalytic activity, durability, and cost. In particular, heteroatom (e.g., N, S, B, or P) doping can tune the electronic and geometric properties of carbon, providing more active sites and enhancing the interaction between carbon structure and active sites. Importantly, involvement of transition metals appears to be necessary for achieving high catalytic activity and improved durability by catalyzing carbonization of nitrogen/carbon precursors to form highly graphitized carbon nanostructures with more favorable nitrogen doping. Recently, a synergetic effect was found between the active species in nanocarbon and the loaded oxides/sulfides, resulting in much improved activity. This report focuses on these carbon composite catalysts. Guidance for rational design and synthesis of advanced alkaline ORR catalysts with improved activity and performance durability is also presented.
URI
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DOI
http://dx.doi.org/10.1002/aenm.201301415
ISSN
1614-6832
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