Catalytic evaluation of nanoflower structured manganese oxide electrocatalyst for oxygen reduction in alkaline media

An electrochemical nanoflowers manganese oxide (MnO2) catalyst has gained much interest due to its high stability and high specific surface area. However, there are a lack of insightful studies of electrocatalyst performance in nanoflower MnO2. This study assesses the electrocatalytic performances o...

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Main Authors: Han, S.J., Ameen, M., Hanifah, M.F.R., Aqsha, A., Bilad, M.R., Jaafar, J., Kheawhom, S.
Format: Article
Institution: Universiti Teknologi Petronas
Record Id / ISBN-0: utp-eprints.30103 /
Published: MDPI 2020
Online Access: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85088559326&doi=10.3390%2fcatal10080822&partnerID=40&md5=521340afb676b8a67b579b54e3a3a7f3
http://eprints.utp.edu.my/30103/
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spelling utp-eprints.301032022-03-25T06:34:24Z Catalytic evaluation of nanoflower structured manganese oxide electrocatalyst for oxygen reduction in alkaline media Han, S.J. Ameen, M. Hanifah, M.F.R. Aqsha, A. Bilad, M.R. Jaafar, J. Kheawhom, S. An electrochemical nanoflowers manganese oxide (MnO2) catalyst has gained much interest due to its high stability and high specific surface area. However, there are a lack of insightful studies of electrocatalyst performance in nanoflower MnO2. This study assesses the electrocatalytic performances of nanoflower structure MnO2 for both oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) in a zinc�air battery as a bifunctional electrocatalyst. The prepared catalyst was characterized in term of morphology, crystallinity, and total surface area. Cyclic voltammetry and linear sweep voltammetry were used to evaluate the electrochemical behaviors of the as-prepared nanoflower-like MnO2. The discharge performance test for zinc�air battery with a MnO2 catalyst was also conducted. The results show that the MnO2 prepared at dwell times of 2, 4 and 6 h were nanoflowers, nanoflower mixed with nanowires, and nanowires with corresponding specific surface areas of 52.4, 34.9 and 32.4 g/cm2, respectively. The nanoflower-like MnO2 catalyst exhibits a better electrocatalytic performance towards both ORR and OER compared to the nanowires. The number of electrons transferred for the MnO2 with nanoflower, nanoflower mixed with nanowires, and nanowire structures is 3.68, 3.31 and 3.00, respectively. The as-prepared MnO2 nanoflower-like structure exhibits the best discharge performance of 31 higher than the nanowires and reaches up to 30 of the theoretical discharge capacity of the zinc�air battery. © 2020 by the authors. Licensee MDPI, Basel, Switzerland. MDPI 2020 Article NonPeerReviewed https://www.scopus.com/inward/record.uri?eid=2-s2.0-85088559326&doi=10.3390%2fcatal10080822&partnerID=40&md5=521340afb676b8a67b579b54e3a3a7f3 Han, S.J. and Ameen, M. and Hanifah, M.F.R. and Aqsha, A. and Bilad, M.R. and Jaafar, J. and Kheawhom, S. (2020) Catalytic evaluation of nanoflower structured manganese oxide electrocatalyst for oxygen reduction in alkaline media. Catalysts, 10 (8). http://eprints.utp.edu.my/30103/
institution Universiti Teknologi Petronas
collection UTP Institutional Repository
description An electrochemical nanoflowers manganese oxide (MnO2) catalyst has gained much interest due to its high stability and high specific surface area. However, there are a lack of insightful studies of electrocatalyst performance in nanoflower MnO2. This study assesses the electrocatalytic performances of nanoflower structure MnO2 for both oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) in a zinc�air battery as a bifunctional electrocatalyst. The prepared catalyst was characterized in term of morphology, crystallinity, and total surface area. Cyclic voltammetry and linear sweep voltammetry were used to evaluate the electrochemical behaviors of the as-prepared nanoflower-like MnO2. The discharge performance test for zinc�air battery with a MnO2 catalyst was also conducted. The results show that the MnO2 prepared at dwell times of 2, 4 and 6 h were nanoflowers, nanoflower mixed with nanowires, and nanowires with corresponding specific surface areas of 52.4, 34.9 and 32.4 g/cm2, respectively. The nanoflower-like MnO2 catalyst exhibits a better electrocatalytic performance towards both ORR and OER compared to the nanowires. The number of electrons transferred for the MnO2 with nanoflower, nanoflower mixed with nanowires, and nanowire structures is 3.68, 3.31 and 3.00, respectively. The as-prepared MnO2 nanoflower-like structure exhibits the best discharge performance of 31 higher than the nanowires and reaches up to 30 of the theoretical discharge capacity of the zinc�air battery. © 2020 by the authors. Licensee MDPI, Basel, Switzerland.
format Article
author Han, S.J.
Ameen, M.
Hanifah, M.F.R.
Aqsha, A.
Bilad, M.R.
Jaafar, J.
Kheawhom, S.
spellingShingle Han, S.J.
Ameen, M.
Hanifah, M.F.R.
Aqsha, A.
Bilad, M.R.
Jaafar, J.
Kheawhom, S.
Catalytic evaluation of nanoflower structured manganese oxide electrocatalyst for oxygen reduction in alkaline media
author_sort Han, S.J.
title Catalytic evaluation of nanoflower structured manganese oxide electrocatalyst for oxygen reduction in alkaline media
title_short Catalytic evaluation of nanoflower structured manganese oxide electrocatalyst for oxygen reduction in alkaline media
title_full Catalytic evaluation of nanoflower structured manganese oxide electrocatalyst for oxygen reduction in alkaline media
title_fullStr Catalytic evaluation of nanoflower structured manganese oxide electrocatalyst for oxygen reduction in alkaline media
title_full_unstemmed Catalytic evaluation of nanoflower structured manganese oxide electrocatalyst for oxygen reduction in alkaline media
title_sort catalytic evaluation of nanoflower structured manganese oxide electrocatalyst for oxygen reduction in alkaline media
publisher MDPI
publishDate 2020
url https://www.scopus.com/inward/record.uri?eid=2-s2.0-85088559326&doi=10.3390%2fcatal10080822&partnerID=40&md5=521340afb676b8a67b579b54e3a3a7f3
http://eprints.utp.edu.my/30103/
_version_ 1741197350371590144
score 11.62408

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