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Advanced Electrocatalysts for Hydrogen Evolution Reaction Based on Core-Shell MoS2/TiO2 Nanostructures in Acidic and Alkaline Media
Lulea Univ Technol, Sweden.
Lulea Univ Technol, Sweden; Univ Sindh Jamshoro, Pakistan.
Lulea Univ Technol, Sweden; CNR, Italy.
Lulea Univ Technol, Sweden.
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2019 (English)In: ACS APPLIED ENERGY MATERIALS, ISSN 2574-0962, Vol. 2, no 3, p. 2053-2062Article in journal (Refereed) Published
Abstract [en]

Hydrogen production as alternative energy source is still a challenge due to the lack of efficient and inexpensive catalysts, alternative to platinum. Thus, stable, earth abundant, and inexpensive catalysts are of prime need for hydrogen production via hydrogen evolution reaction (HER). Herein, we present an efficient and stable electrocatalyst composed of earth abundant TiO2 nanorods decorated with molybdenum disulfide thin nanosheets, a few nanometers thick. We grew rutile TiO2 nanorods via the hydrothermal method on conducting glass substrate, and then we nucleated the molybdenum disulfide nanosheets as the top layer. This composite possesses excellent hydrogen evolution activity in both acidic and alkaline media at considerably low overpotentials (350 mV and 700 mV in acidic and alkaline media, respectively) and small Tafel slopes (48 and 60 mV/dec in acidic and alkaline conditions, respectively), which are better than several transition metal dichalcogenides, such as pure molybdenum disulfide and cobalt diselenide. A good stability in acidic and alkaline media is reported here for the new MoS2/TiO2 electrocatalyst. These results demonstrate the potential of composite electrocatalysts for HER based on earth abundant, cost-effective, and environmentally friendly materials, which can also be of interest for a broader range of scalable applications in renewable energies, such as lithium sulfur batteries, solar cells, and fuel cells.

Place, publisher, year, edition, pages
AMER CHEMICAL SOC , 2019. Vol. 2, no 3, p. 2053-2062
Keywords [en]
hydrogen evolution reaction; MoS2; TiO2; catalyst; acidic; alkaline
National Category
Other Chemical Engineering
Identifiers
URN: urn:nbn:se:liu:diva-163971DOI: 10.1021/acsaem.8b02119ISI: 000462944700053OAI: oai:DiVA.org:liu-163971DiVA, id: diva2:1412317
Note

Funding Agencies|Knut & Alice Wallenberg FoundationKnut & Alice Wallenberg Foundation [2016.0346]; Kempe Foundation [JCK-1606]; European Unions Horizon 2020 research and innovation programme [654002]

Available from: 2020-03-05 Created: 2020-03-05 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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