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http://hdl.handle.net/10397/79270
Title: | Transition metal hollow nanocages as promising cathodes for the long-term cyclability of Li-O-2 batteries | Authors: | Chatterjee, A Or, SW Cao, YL |
Issue Date: | 2018 | Source: | Nanomaterials, May 2018, v. 8, no. 5, 308, p. 1-15 | Abstract: | As a step towards efficient and cost-effective electrocatalytic cathodes for Li-O-2 batteries, highly porous hausmannite-type Mn3O4 hollow nanocages (MOHNs) of a large diameter of -250 nm and a high surface area of 90.65 m(2).g(-1) were synthesized and their physicochemical and electrochemical properties were studied in addition to their formation mechanism. A facile approach using carbon spheres as the template and MnCl2 as the precursor was adopted to suit the purpose. The MOHNs/Ketjenblack cathode-based Li-O-2 battery demonstrated an improved cyclability of 50 discharge-charge cycles at a specific current of 400 mA.g(-1) and a specific capacity of 600 mAh.g(-1). In contrast, the Ketjenblack cathode-based one can sustain only 15 cycles under the same electrolytic system comprised of 1 M LiTFSI/TEGDME. It is surmised that the unique hollow nanocage morphology of MOHNs is responsible for the high electrochemical performance. The hollow nanocages were a result of the aggregation of crystalline nanoparticles of 25-35 nm size, and the mesoscopic pores between the nanoparticles gave rise to a loosely mesoporous structure for accommodating the volume change in the MOHNs/Ketjenblack cathode during electrocatalytic reactions. The improved cyclic stability is mainly due to the faster mass transport of the O-2 through the mesoscopic pores. This work is comparable to the state-of-the-art experimentations on cathodes for Li-O-2 batteries that focus on the use of non-precious transition materials. | Keywords: | Electrocatalytic cathodes Hollow nanocages Li-O-2 batteries Cyclic stability Transition metals |
Publisher: | Molecular Diversity Preservation International (MDPI) | Journal: | Nanomaterials | ISSN: | 2079-4991 | DOI: | 10.3390/nano8050308 | Rights: | © 2018 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). The following publication Chatterjee, A., Or, S. W., & Cao, Y. (2018). Transition metal hollow nanocages as promising cathodes for the long-term cyclability of Li–O2batteries. Nanomaterials, 8(5), 308, 1-15 is available at https://doi.org/10.3390/nano8050308 |
Appears in Collections: | Journal/Magazine Article |
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