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Advanced Co3O4-CuO nano-composite based electrocatalyst for efficient hydrogen evolution reaction in alkaline media
Linköping University, Department of Science and Technology, Physics, Electronics and Mathematics. Linköping University, Faculty of Science & Engineering.
Univ Sindh, Pakistan.
Linköping University, Department of Science and Technology, Physics, Electronics and Mathematics. Linköping University, Faculty of Science & Engineering.ORCID iD: 0000-0001-6235-7038
Linköping University, Department of Science and Technology, Physics, Electronics and Mathematics. Linköping University, Faculty of Science & Engineering.
2019 (English)In: International journal of hydrogen energy, ISSN 0360-3199, E-ISSN 1879-3487, Vol. 44, no 48, p. 26148-26157Article in journal (Refereed) Published
Abstract [en]

In this study, we incorporate a copper impurity into (Co3O4) nanowires precursor that turn them into an active catalyst for the hydrogen evolution reaction in 1M KOH. The XRD and XPS results are in good agreement and confirmed the formation of Co3O4-CuO nano composite by wet chemical method. To date, the performance of hydrogen evolution reaction in alkaline for the composite catalyst is comparable or superior to cobalt oxide based HER electro-catalysts. The HER catalyst exhibits the lowest Tafel slope of 65 mVdec(-1) for the cobalt-based catalysts in alkaline media. A current density of 10 mA/cm(2) is achieved at a potential of 0.288 V vs reversible hydrogen electrode (RHE). The mixed transition metal oxide Co3O4-CuO based HER electro-catalyst is highly stable and durable. The EIS results demonstrates that HER is highly favorable on the Co3O4-CuO due to the relatively small charge transfer resistance (173.20 Ohm) and higher capacitance values (1.97 mF). (C) 2019 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

Place, publisher, year, edition, pages
PERGAMON-ELSEVIER SCIENCE LTD , 2019. Vol. 44, no 48, p. 26148-26157
Keywords [en]
Composite metal oxide; Electro-catalyst; Hydrogen evolution reaction
National Category
Other Chemical Engineering
Identifiers
URN: urn:nbn:se:liu:diva-162348DOI: 10.1016/j.ijhydene.2019.08.120ISI: 000494890900004OAI: oai:DiVA.org:liu-162348DiVA, id: diva2:1374040
Available from: 2019-11-28 Created: 2019-11-28 Last updated: 2020-05-14
In thesis
1. Electrochemical water splitting based on metal oxide composite nanostructures
Open this publication in new window or tab >>Electrochemical water splitting based on metal oxide composite nanostructures
2020 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The occurrence of available energy reservoirs is decreasing steeply, therefore we are looking for an alternative and sustainable renewable energy resources. Among them, hydrogen is considered as green fuel with a high density of energy. In nature, hydrogen is not found in a free state and it is most likely present in the compound form for example H2O. Water covers almost 75% of the earth planet. To produce hydrogen from water, it requires an efficient catalyst. For this purpose, noble materials such as Pt, Ir, and Ru are efficient materials for water splitting. These precious catalysts are rare in nature, very costly, and are restricted from largescale applications. Therefore, search for a new earth-abundant and nonprecious materials is a hot spot area in the research today. Among the materials, nanomaterials are excellent candidates because of their potential properties for extended applications, particularly in energy systems. The fabrication of nanostructured materials with high specific surface area, fast charge transport, rich catalytic sites, and huge ion transport is the key challenge for turning nonprecious materials into precious catalytic materials. In this thesis, we have investigated nonprecious nanostructured materials and they are found to be efficient for electrochemical water splitting. These nanostructured materials include MoS2-TiO2, MoS2, TiO2, MoSx@NiO, NiO, nickeliron layered double hydroxide (NiFeLDH)/Co3O4, NiFeLDH, Co3O4, Cu-doped MoS2, Co3O4- CuO, CuO, etc. The composition, morphology, crystalline structure, and phase purities are investigated by a wide range of analytical instruments such as XPS, SEM, HRTEM, and XRD. The production of hydrogen/oxygen from water is obtained either in the acidic or alkaline media. Based on the functional characterization we believe that these newly produced nanostructured materials can be capitalized for the development of water splitting, batteries, and other energy-related devices.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2020. p. 64
Series
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 2066
Keywords
Composite metal oxides, hydrothermal method, water splitting, Tafel slope, stability, durability, alkaline media, acidic media
National Category
Materials Chemistry
Identifiers
urn:nbn:se:liu:diva-165726 (URN)10.3384/diss.diva-165726 (DOI)9789179298661 (ISBN)
Public defence
2020-06-12, TPM55, Täppan, Campus Norrköping, Norrköping, 10:15 (English)
Opponent
Supervisors
Available from: 2020-05-14 Created: 2020-05-14 Last updated: 2020-05-18Bibliographically approved

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The full text will be freely available from 2021-09-18 11:09
Available from 2021-09-18 11:09

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