Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/106184
Title: Carbon nanotube-encapsulated noble metal nanoparticle hybrid as a cathode material for Li-oxygen batteries
Authors: Huang, Xin
Yu, Hong
Tan, Huiteng
Zhang, Wenyu
Zhu, Jixin
Wang, Chengyuan
Zhang, Jun
Wang, Yuxi
Lv, Yunbo
Zeng, Zhi
Liu, Dayong
Ding, Jun
Zhang, Qichun
Srinivasan, Madhavi
Ajayan, Pulickel M.
Hng, Huey Hoon
Yan, Qingyu
Keywords: DRNTU::Engineering::Materials::Functional materials
Issue Date: 2014
Source: Huang, X., Yu, H., Tan, H., Zhu, J., Zhang, W., Wang, C., et al. (2014). Carbon nanotube-encapsulated noble metal nanoparticle hybrid as a cathode material for Li-oxygen batteries. Advanced functional materials, 24(41), 6516-6523.
Series/Report no.: Advanced functional materials
Abstract: Although Li-oxygen batteries offer extremely high theoretical specific energy, their practical application still faces critical challenges. One of the main obstacles is the high charge overpotential caused by sluggish kinetics of charge transfer that is closely related to the morphology of discharge products and their distribution on the cathode. Here, a series of noble metal nanoparticles (Pd, Pt, Ru and Au) are encapsulated inside end-opened carbon nanotubes (CNTs) by wet impregnation followed by thermal annealing. The resultant cathode materials exhibit a dramatic reduction of charge overpotentials compared to their counterparts with nanoparticles supported on CNT surface. Notably, the charge overpotential can be as low as 0.3 V when CNT-encapsulated Pd nanoparticles are used on the cathode. The cathode also shows good stability during discharge–charge cycling. Density functional theory (DFT) calculations reveal that encapsulation of “guest” noble metal nanoparticles in “host” CNTs is able to strengthen the electron density on CNT surfaces, and to avoid the regional enrichment of electron density caused by the direct exposure of nanoparticles on CNT surface. These unique properties ensure the uniform coverage of Li2O2 nanocrystals on CNT surfaces instead of localized distribution of Li2O2 aggregation, thus providing efficient charge transfer for the decomposition of Li2O2.
URI: https://hdl.handle.net/10356/106184
http://hdl.handle.net/10220/20688
ISSN: 1616-301X
DOI: 10.1002/adfm.201400921
Rights: © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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