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An efficient bifunctional electrocatalyst based on a nickel iron layered double hydroxide functionalized Co3O4 core shell structure in alkaline media
Linköping University, Department of Science and Technology, Physics, Electronics and Mathematics. Linköping University, Faculty of Science & Engineering.
Univ Sindh Jamshoro, Pakistan.
Linköping University, Department of Physics, Chemistry and Biology. Linköping University, Faculty of Science & Engineering.ORCID iD: 0000-0001-8478-4663
Mehran Univ Engn and Technol, Pakistan.
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2019 (English)In: Catalysis Science & Technology, ISSN 2044-4753, E-ISSN 2044-4761, Vol. 9, no 11, p. 2879-2887Article in journal (Refereed) Published
Abstract [en]

Developing highly active nonprecious metal and binder free bifunctional electrocatalysts for water splitting is a challenging task. In this study, we used a simple strategy to deposit a nickel iron layered double hydroxide (NiFeLDH) onto cobalt oxide (Co3O4) nanowires. The cobalt oxide nanowires are covered with thin nanosheets of NiFeLDH forming a core shell structure. The Co3O4 nanowires contain the mixed oxidation states of Co2+ and Co3+, and the surface modification of Co3O4 nanowires has shown synergetic effects due to there being more oxygen defects, catalytic sites, and enhanced electronic conductivity. Further, the core shell structure of Co3O4 nanowires demonstrated a bifunctional activity for water splitting in 1 M KOH aqueous solution. From the hydrogen evolution reaction (HER), a current density of 10 mA cm - 2 is achieved at a potential of - 0.303 V vs. reversible hydrogen electrode (RHE). Meanwhile for the case of the oxygen evolution reaction (OER), a current density of 40 mA cm - 2 is measured at a potential of 1.49 V vs. RHE. Also, this electrocatalyst has shown a considerable long- term stability of 15 h for both the HER and the OER. Importantly, electrochemical impedance spectroscopy has shown that the NiFeLDH integration onto cobalt oxide exhibited around 3 fold decrease of charge transfer resistance for both the HER and the OER in comparison with pristine cobalt oxide films, which reveals an excellent electrocatalytic activity for both faradaic processes. All these results confirm that the proposed electrocatalyst can be integrated into an efficient water splitting system.

Place, publisher, year, edition, pages
Royal Society of Chemistry, 2019. Vol. 9, no 11, p. 2879-2887
National Category
Materials Chemistry
Identifiers
URN: urn:nbn:se:liu:diva-158546DOI: 10.1039/c9cy00351gISI: 000470710300013Scopus ID: 2-s2.0-85066976848OAI: oai:DiVA.org:liu-158546DiVA, id: diva2:1334907
Available from: 2019-07-03 Created: 2019-07-03 Last updated: 2020-05-14Bibliographically approved
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)
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Supervisors
Available from: 2020-05-14 Created: 2020-05-14 Last updated: 2020-05-18Bibliographically approved

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