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Self-Supported Nano Catalysts for Electrochemical Seawater Splitting.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Self-Supported Nano Catalysts for Electrochemical Seawater Splitting./
作者:	Haq, Tanveer ul.
面頁冊數:	1 online resource (499 pages)
附註:	Source: Dissertations Abstracts International, Volume: 84-01, Section: B.
Contained By:	Dissertations Abstracts International84-01B.
標題:	Nanotechnology. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=29255237click for full text (PQDT)
ISBN:	9798834026068

Self-Supported Nano Catalysts for Electrochemical Seawater Splitting.
Haq, Tanveer ul.

Self-Supported Nano Catalysts for Electrochemical Seawater Splitting. - 1 online resource (499 pages)

Source: Dissertations Abstracts International, Volume: 84-01, Section: B.

Thesis (Ph.D.)--Texas A&M University - Kingsville, 2022.

Includes bibliographical references

The overarching objective of this research project was to design a cost-effective electrocatalyst viable for producing green H2 by investigating different strategies that are expected to lead to an electrocatalyst with fast kinetics for mass and electronic transfer and sustained a high geometric activity at low input voltage. These strategies include producing electrocatalysts with: (1) Synergistic electronic modulation: The electronic structure of transition metal (TM) based catalyst was tuned by creating oxygen vacancies, heterogeneous doping of heteroatoms (B, S, Cl), strain effect, etc. The protective layers (borate and hydroxide) were introduced next to the OER active sites to block the Cl- adsorption and increase the selectivity and durability of anode material. (2) Surface and structural optimization: The surface of the synthesized nanoclusters (NCs) catalysts was optimized at the nanoscale by controlling the surface coverage of the NCs to increase the aerophobicity of the electrocatalyst. Amorphousness was introduced in the catalyst structure to enhance the electrochemical active surface area (ECSA), hydrophilicity, self-healing, and surface reconstruction characteristics of the material to increase the reactivity and chemical durability of the nanocatalyst. Porosity was created to enhance the diffusion channels for mass transport and gas releasing ability to mitigate the catalyst degradation resulting from the blockage of active sites. (3) Strong catalyst-support interaction: Compared to conventional powder materials, self-supported (free standing) electrode materials were designed through anodization, electrodeposition, hydro/solvothermal, and microwave assisted synthesis strategies to grow active sites on the current collector directly (substrate) to evade post coating process, which decrease the cost and simplifies the electrode fabrication process. The increased interaction of active sites with the substrate enhances the charge transfer rate at the interface and reduces the leaching probability at a high current density where immense gases are produced. These electronic and structural features were successfully fitted into one electrocatalyst that provides a large specific surface area, high electrical conductivity, ionic mobility, intrinsic activity for each active site, and efficient charge transfer, leading to an outstanding catalytic performance. The synthesized catalysts were investigated with advanced characterization tools such as electron microscopy (SEM, TEM, HRTEM, SAED, AFM), X-ray diffraction (XRD), Raman spectroscopy, and X-ray photoelectron spectroscopy (XPS) before as well as after electrolysis to probe any variations in morphological, compositional, or physical properties which might affect the reaction kinetics. Based on the electrochemical and physical characterizations we believe that these novel nanostructured materials can be capitalized for the realization of direct seawater electrolysis.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2023

Mode of access: World Wide Web

ISBN: 9798834026068Subjects--Topical Terms:

526235
Nanotechnology.
Subjects--Index Terms:

Electronic and structural modulationsIndex Terms--Genre/Form:

542853
Electronic books.

Self-Supported Nano Catalysts for Electrochemical Seawater Splitting.
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504 $a Includes bibliographical references
520 $a The overarching objective of this research project was to design a cost-effective electrocatalyst viable for producing green H2 by investigating different strategies that are expected to lead to an electrocatalyst with fast kinetics for mass and electronic transfer and sustained a high geometric activity at low input voltage. These strategies include producing electrocatalysts with: (1) Synergistic electronic modulation: The electronic structure of transition metal (TM) based catalyst was tuned by creating oxygen vacancies, heterogeneous doping of heteroatoms (B, S, Cl), strain effect, etc. The protective layers (borate and hydroxide) were introduced next to the OER active sites to block the Cl- adsorption and increase the selectivity and durability of anode material. (2) Surface and structural optimization: The surface of the synthesized nanoclusters (NCs) catalysts was optimized at the nanoscale by controlling the surface coverage of the NCs to increase the aerophobicity of the electrocatalyst. Amorphousness was introduced in the catalyst structure to enhance the electrochemical active surface area (ECSA), hydrophilicity, self-healing, and surface reconstruction characteristics of the material to increase the reactivity and chemical durability of the nanocatalyst. Porosity was created to enhance the diffusion channels for mass transport and gas releasing ability to mitigate the catalyst degradation resulting from the blockage of active sites. (3) Strong catalyst-support interaction: Compared to conventional powder materials, self-supported (free standing) electrode materials were designed through anodization, electrodeposition, hydro/solvothermal, and microwave assisted synthesis strategies to grow active sites on the current collector directly (substrate) to evade post coating process, which decrease the cost and simplifies the electrode fabrication process. The increased interaction of active sites with the substrate enhances the charge transfer rate at the interface and reduces the leaching probability at a high current density where immense gases are produced. These electronic and structural features were successfully fitted into one electrocatalyst that provides a large specific surface area, high electrical conductivity, ionic mobility, intrinsic activity for each active site, and efficient charge transfer, leading to an outstanding catalytic performance. The synthesized catalysts were investigated with advanced characterization tools such as electron microscopy (SEM, TEM, HRTEM, SAED, AFM), X-ray diffraction (XRD), Raman spectroscopy, and X-ray photoelectron spectroscopy (XPS) before as well as after electrolysis to probe any variations in morphological, compositional, or physical properties which might affect the reaction kinetics. Based on the electrochemical and physical characterizations we believe that these novel nanostructured materials can be capitalized for the realization of direct seawater electrolysis.
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538 $a Mode of access: World Wide Web
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650 4 $a Engineering. $3 586835
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653 $a Nanomaterials
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