Mesoporous Co3O4 Nanoflakes as an Efficient and Non-Precious Cathode Catalyst for Oxygen Reduction Reaction in Air-Cathode Microbial Fuel Cells

Mesoporous Co3O4 Nanoflakes as an Efficient and Non-Precious Cathode Catalyst for Oxygen Reduction Reaction in Air-Cathode Microbial Fuel Cells

Cobalt oxide is well known for its excellent oxygen reduction reaction (ORR) activity, however, its ORR activity can be further improved by synthesizing its porous architecture. Therefore, mesoporous Co 3 O 4 nanoflakes were prepared by a two-step hydrothermal method and were employed as the cathode...

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Main Authors: Kumar, Ravinder, Singh, Lakhveer, Zularisam, A. W.
Format: Article
Language:English
Published: Elsevier 2017
Subjects:
T Technology (General)
Online Access:http://umpir.ump.edu.my/id/eprint/18419/
http://umpir.ump.edu.my/id/eprint/18419/
http://umpir.ump.edu.my/id/eprint/18419/
http://umpir.ump.edu.my/id/eprint/18419/1/ftech-2017-lakhveer-Mesoporous%20Co3O4%201.pdf
id ump-18419
recordtype eprints
spelling ump-184192019-08-28T02:51:31Z http://umpir.ump.edu.my/id/eprint/18419/ Mesoporous Co3O4 Nanoflakes as an Efficient and Non-Precious Cathode Catalyst for Oxygen Reduction Reaction in Air-Cathode Microbial Fuel Cells Kumar, Ravinder Singh, Lakhveer Zularisam, A. W. T Technology (General) Cobalt oxide is well known for its excellent oxygen reduction reaction (ORR) activity, however, its ORR activity can be further improved by synthesizing its porous architecture. Therefore, mesoporous Co 3 O 4 nanoflakes were prepared by a two-step hydrothermal method and were employed as the cathode cata- lyst in a double-chamber microbial fuel cell (MFC) to explore its ORR activity for electricity generation. The electrochemical tests suggested that addition of Co 3 O 4 nanoflakes enhanced the electrocatalytic ac- tivity of the cathode significantly. Besides, the cathode with a higher concentration of Co3O4 nanoflakes (COF-2) showed faster ORR kinetics as compared to the bare cathode. Evidently, COF-2 achieved an ex- change current density of 4.18 mA/cm 2, which was 3.2 times higher as compared to the bare cathode. Consequently, this improved ORR activity increased the power output in MFC. COF-2 obtained a maxi- mum power density of 347 ±7 mW/m 2, which was approximately 8 times higher than the bare cathode. The enhanced ORR activity and improved electric output in the MFC can be attributed to the mesoporous nature of Co 3 O 4 nanoflakes that exposed a higher number of ORR active sites at the cathode surface. Overall, mesoporous Co 3 O 4 nanoflakes proved to be highly efficient and ca. 30 times cheaper than plat- inum, therefore, can be preferred in large-scale MFC applications over other expensive cathode catalysts. Elsevier 2017-09 Article PeerReviewed application/pdf en http://umpir.ump.edu.my/id/eprint/18419/1/ftech-2017-lakhveer-Mesoporous%20Co3O4%201.pdf Kumar, Ravinder and Singh, Lakhveer and Zularisam, A. W. (2017) Mesoporous Co3O4 Nanoflakes as an Efficient and Non-Precious Cathode Catalyst for Oxygen Reduction Reaction in Air-Cathode Microbial Fuel Cells. Journal of the Taiwan Institute of Chemical Engineers, 78. pp. 329-336. ISSN 1876-1070 https://doi.org/10.1016/j.jtice.2017.06.026 DOI: 10.1016/j.jtice.2017.06.026
repository_type Digital Repository
institution_category Local University
institution Universiti Malaysia Pahang
building UMP Institutional Repository
collection Online Access
language English
topic T Technology (General)
spellingShingle T Technology (General)
Kumar, Ravinder
Singh, Lakhveer
Zularisam, A. W.
Mesoporous Co3O4 Nanoflakes as an Efficient and Non-Precious Cathode Catalyst for Oxygen Reduction Reaction in Air-Cathode Microbial Fuel Cells
description Cobalt oxide is well known for its excellent oxygen reduction reaction (ORR) activity, however, its ORR activity can be further improved by synthesizing its porous architecture. Therefore, mesoporous Co 3 O 4 nanoflakes were prepared by a two-step hydrothermal method and were employed as the cathode cata- lyst in a double-chamber microbial fuel cell (MFC) to explore its ORR activity for electricity generation. The electrochemical tests suggested that addition of Co 3 O 4 nanoflakes enhanced the electrocatalytic ac- tivity of the cathode significantly. Besides, the cathode with a higher concentration of Co3O4 nanoflakes (COF-2) showed faster ORR kinetics as compared to the bare cathode. Evidently, COF-2 achieved an ex- change current density of 4.18 mA/cm 2, which was 3.2 times higher as compared to the bare cathode. Consequently, this improved ORR activity increased the power output in MFC. COF-2 obtained a maxi- mum power density of 347 ±7 mW/m 2, which was approximately 8 times higher than the bare cathode. The enhanced ORR activity and improved electric output in the MFC can be attributed to the mesoporous nature of Co 3 O 4 nanoflakes that exposed a higher number of ORR active sites at the cathode surface. Overall, mesoporous Co 3 O 4 nanoflakes proved to be highly efficient and ca. 30 times cheaper than plat- inum, therefore, can be preferred in large-scale MFC applications over other expensive cathode catalysts.
format Article
author Kumar, Ravinder
Singh, Lakhveer
Zularisam, A. W.
author_facet Kumar, Ravinder
Singh, Lakhveer
Zularisam, A. W.
author_sort Kumar, Ravinder
title Mesoporous Co3O4 Nanoflakes as an Efficient and Non-Precious Cathode Catalyst for Oxygen Reduction Reaction in Air-Cathode Microbial Fuel Cells
title_short Mesoporous Co3O4 Nanoflakes as an Efficient and Non-Precious Cathode Catalyst for Oxygen Reduction Reaction in Air-Cathode Microbial Fuel Cells
title_full Mesoporous Co3O4 Nanoflakes as an Efficient and Non-Precious Cathode Catalyst for Oxygen Reduction Reaction in Air-Cathode Microbial Fuel Cells
title_fullStr Mesoporous Co3O4 Nanoflakes as an Efficient and Non-Precious Cathode Catalyst for Oxygen Reduction Reaction in Air-Cathode Microbial Fuel Cells
title_full_unstemmed Mesoporous Co3O4 Nanoflakes as an Efficient and Non-Precious Cathode Catalyst for Oxygen Reduction Reaction in Air-Cathode Microbial Fuel Cells
title_sort mesoporous co3o4 nanoflakes as an efficient and non-precious cathode catalyst for oxygen reduction reaction in air-cathode microbial fuel cells
publisher Elsevier
publishDate 2017
url http://umpir.ump.edu.my/id/eprint/18419/
http://umpir.ump.edu.my/id/eprint/18419/
http://umpir.ump.edu.my/id/eprint/18419/
http://umpir.ump.edu.my/id/eprint/18419/1/ftech-2017-lakhveer-Mesoporous%20Co3O4%201.pdf
first_indexed 2023-09-18T22:26:05Z
last_indexed 2023-09-18T22:26:05Z
_version_ 1777415975602225152

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