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MXenes as Support for Electrocatalysts towards Oxygen Reduction Reaction in Alkaline Media

Research output: ThesisDoctoral Thesis

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MXenes as Support for Electrocatalysts towards Oxygen Reduction Reaction in Alkaline Media. / Bouscarrat, Luc.
Lancaster University, 2023. 142 p.

Research output: ThesisDoctoral Thesis

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Bouscarrat L. MXenes as Support for Electrocatalysts towards Oxygen Reduction Reaction in Alkaline Media. Lancaster University, 2023. 142 p. doi: 10.17635/lancaster/thesis/2206

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@phdthesis{29cb8bef4908407184f58b94e299ba94,
title = "MXenes as Support for Electrocatalysts towards Oxygen Reduction Reaction in Alkaline Media",
abstract = "Due to increasing concerns about the ever increasing energy demand, the global energy system needs to transition away from fossil fuels, as they have been one of the main causes for climate change and air pollution. Fuel cells offer a good alternative to conventional thermal devices, as they usually use hydrogen and oxygen to produce electricity without greenhouse gases emissions. One of the main drawbacks to fuel cell commercialisation is the use of expensive catalysts, such as platinum, and their long-term stability under operation. Therefore, the design and study of cheap and durable catalysts is required to push the development of fuel cells. MXenes, a new family of two-dimensional transition metal carbides and nitrides materials, have shown some potential as support for ORR catalysts. However, the performance of electrocatalysts is directly related to the available surface where the electrochemical reaction could take place, and MXenes have pretty low specific surface areas compared to conventional supports used in the field of catalysis.This thesis reports the development of a synthesis method focused on improving the final catalyst surface area using MXene (Ti3C2) as support, by intercalating the precursors between the MXene layers before annealing. This is shown to lead to the formation of porous MXene structures, with increased surface area and decomposition products from the precursors on the surface of the MXene layers, which hindered the MXene layer restacking during thermal treatment. The samples where then tested in a three-electrode setup using the RDE method to evaluate the ORR performance of the synthesized materials. It was found that the addition of the precursors improved the overall performance of the materials. The different samples were also characterized to understand the connection between physico-chemical properties and electrochemical properties.",
keywords = "MXenes, ORR, Oxygen reduction reaction, RDE, Rotating disk electrode, Alkaline, Fuel cell",
author = "Luc Bouscarrat",
year = "2023",
doi = "10.17635/lancaster/thesis/2206",
language = "English",
publisher = "Lancaster University",
school = "Lancaster University",

}

RIS

TY - BOOK

T1 - MXenes as Support for Electrocatalysts towards Oxygen Reduction Reaction in Alkaline Media

AU - Bouscarrat, Luc

PY - 2023

Y1 - 2023

N2 - Due to increasing concerns about the ever increasing energy demand, the global energy system needs to transition away from fossil fuels, as they have been one of the main causes for climate change and air pollution. Fuel cells offer a good alternative to conventional thermal devices, as they usually use hydrogen and oxygen to produce electricity without greenhouse gases emissions. One of the main drawbacks to fuel cell commercialisation is the use of expensive catalysts, such as platinum, and their long-term stability under operation. Therefore, the design and study of cheap and durable catalysts is required to push the development of fuel cells. MXenes, a new family of two-dimensional transition metal carbides and nitrides materials, have shown some potential as support for ORR catalysts. However, the performance of electrocatalysts is directly related to the available surface where the electrochemical reaction could take place, and MXenes have pretty low specific surface areas compared to conventional supports used in the field of catalysis.This thesis reports the development of a synthesis method focused on improving the final catalyst surface area using MXene (Ti3C2) as support, by intercalating the precursors between the MXene layers before annealing. This is shown to lead to the formation of porous MXene structures, with increased surface area and decomposition products from the precursors on the surface of the MXene layers, which hindered the MXene layer restacking during thermal treatment. The samples where then tested in a three-electrode setup using the RDE method to evaluate the ORR performance of the synthesized materials. It was found that the addition of the precursors improved the overall performance of the materials. The different samples were also characterized to understand the connection between physico-chemical properties and electrochemical properties.

AB - Due to increasing concerns about the ever increasing energy demand, the global energy system needs to transition away from fossil fuels, as they have been one of the main causes for climate change and air pollution. Fuel cells offer a good alternative to conventional thermal devices, as they usually use hydrogen and oxygen to produce electricity without greenhouse gases emissions. One of the main drawbacks to fuel cell commercialisation is the use of expensive catalysts, such as platinum, and their long-term stability under operation. Therefore, the design and study of cheap and durable catalysts is required to push the development of fuel cells. MXenes, a new family of two-dimensional transition metal carbides and nitrides materials, have shown some potential as support for ORR catalysts. However, the performance of electrocatalysts is directly related to the available surface where the electrochemical reaction could take place, and MXenes have pretty low specific surface areas compared to conventional supports used in the field of catalysis.This thesis reports the development of a synthesis method focused on improving the final catalyst surface area using MXene (Ti3C2) as support, by intercalating the precursors between the MXene layers before annealing. This is shown to lead to the formation of porous MXene structures, with increased surface area and decomposition products from the precursors on the surface of the MXene layers, which hindered the MXene layer restacking during thermal treatment. The samples where then tested in a three-electrode setup using the RDE method to evaluate the ORR performance of the synthesized materials. It was found that the addition of the precursors improved the overall performance of the materials. The different samples were also characterized to understand the connection between physico-chemical properties and electrochemical properties.

KW - MXenes

KW - ORR

KW - Oxygen reduction reaction

KW - RDE

KW - Rotating disk electrode

KW - Alkaline

KW - Fuel cell

U2 - 10.17635/lancaster/thesis/2206

DO - 10.17635/lancaster/thesis/2206

M3 - Doctoral Thesis

PB - Lancaster University

ER -