Mesoporous LaMnO3+delta perovskite from spray - pyrolysis with superior performance for oxygen reduction reaction and Zn - air battery

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Kuai , L , Kan , E , Cao , W , Huttula , M , Ollikkala , S , Ahopelto , T , Honkanen , A-P , Huotari , S , Wang , W & Geng , B 2018 , ' Mesoporous LaMnO3+delta perovskite from spray - pyrolysis with superior performance for oxygen reduction reaction and Zn - air battery ' , Nano Energy , vol. 43 , pp. 81-90 . https://doi.org/10.1016/j.nanoen.2017.11.018

Title: Mesoporous LaMnO3+delta perovskite from spray - pyrolysis with superior performance for oxygen reduction reaction and Zn - air battery
Author: Kuai, Long; Kan, Erjie; Cao, Wei; Huttula, Marko; Ollikkala, Sami; Ahopelto, Taru; Honkanen, Ari-Pekka; Huotari, Simo; Wang, Wenhai; Geng, Baoyou
Contributor: University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
Date: 2018-01
Language: eng
Number of pages: 10
Belongs to series: Nano Energy
ISSN: 2211-2855
URI: http://hdl.handle.net/10138/306781
Abstract: Oxygen reduction reaction (ORR) is the key reaction in various electrochemical energy devices. This work reports an inexpensive mesoporous LaMnO3+δ perovskite for ORR with remarkable activity, synthesized by a facile aerosol-spray assisted approach. The mesoporous LaMnO3+δ material shows a factor of 3.1 higher activity (at 0.9 V vs. RHE) than LaMnO3 obtained from co-precipitation method (LMO-CP). Based on results of x-ray absorption near-edge spectroscopy (XANES), x-ray photoelectron spectroscopy (XPS) and Brunauer–Emmett–Teller (BET) analysis, we conclude that the chemical state of surface Mn and the high surface area are the sources to the notably enhanced activity. The study of Zn-air batteries device further confirmed a Pt/C comparable performance in the practical devices with the novel mesoporous LaMnO3+δ catalyst, where the power density at 200 mA/cm2 is only 2.1% lower than in the battery with same-loaded Pt/C catalyst. Therefore, the high mass activity and low-cost of Mn/La may make LaMnO3+δ further approach to the application of electrochemical devices.
Subject: 114 Physical sciences
LaMnO3+delta
Mesoporous
Oxidation state
Oxygen reduction reaction
Zn-air battery
METAL-ORGANIC FRAMEWORK
EFFICIENT ELECTROCATALYST
MANGANESE OXIDES
FUEL-CELLS
B-SITE
CARBON
CATALYSTS
SURFACE
NANOPARTICLES
TRANSITION
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