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Systems for CO2 Utilization: Property Measurement and Electrocatalytic Conversion.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Systems for CO2 Utilization: Property Measurement and Electrocatalytic Conversion./
Author:	Xu, Yi.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2021,
Description:	202 p.
Notes:	Source: Dissertations Abstracts International, Volume: 82-09, Section: B.
Contained By:	Dissertations Abstracts International82-09B.
Subject:	Energy. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28265178
ISBN:	9798597067261

Systems for CO2 Utilization: Property Measurement and Electrocatalytic Conversion.
Xu, Yi.

Systems for CO2 Utilization: Property Measurement and Electrocatalytic Conversion. - Ann Arbor : ProQuest Dissertations & Theses, 2021 - 202 p.

Source: Dissertations Abstracts International, Volume: 82-09, Section: B.

Thesis (Ph.D.)--University of Toronto (Canada), 2021.

This item must not be sold to any third party vendors.

Carbon dioxide (CO2) emissions account for approximately 80% of anthropogenic contributions to greenhouse gas emissions and there is a growing need for CO2 utilization strategies. CO2 at supercritical conditions can be employed as a green solvent for extractions and separations, or can be injected in the subsurface for storage. CO2 can also be used as a reactant, a raw material to be converted into valuable chemicals via electrocatalysis. It is likely that all such approaches are needed, and more, to substantially reduce greenhouse gas emissions. The study of the physical and chemical properties of CO2 informs these climate-critical CO2 mitigation approaches.Understanding the CO2 phase behavior of complex fluid mixtures - liquid, gas, supercritical - at different thermodynamic conditions is essential to many industrial and chemical processes. In this work a phase behavior measuring chip was developed that can simultaneously determine the phase behavior of fluids at multiple combinations of temperature and pressure within the application's scope. This phase chip testing method demonstrated a hundredfold decrease in the processing time comparing to the current industrial testing processes while maintaining experimental resolution and high accuracy (Chapter 3). At the same time, this work provides a platform for exploring CO2 mixture phase behavior, interface behavior, and mass transport.Electrochemical reduction of CO2 to valuable liquid fuels and chemical feedstocks is a sustainable approach to intermittent electricity utilization. Gas diffusion heterogeneous reaction electrodes facilitate effective CO2 mass transport to the catalyst, enabling electrolyzers to operate at the current densities required for industrial deployment. However, the complex interactions between a solid catalyst, liquid electrolyte, and gas reagents of heterogeneous electrodes significantly influence the CO2 reduction reaction (CO2RR) performance. This work focuses on CO2 local availabilities/pressure (Chapter 4), microstructure wetting capabilities (Chapter 4), pH distribution (Chapter 5), and electromigration (Chapter 5) with the goal of improving the performance of the CO2 reduction reaction (CO2RR) in practical systems. Together these efforts improve efficiencies, selectivities, and current densities of CO2 electrocatalytic systems, and advance the field of CO2 utilization more generally.

ISBN: 9798597067261Subjects--Topical Terms:

876794
Energy.
Subjects--Index Terms:

Carbon dioxide utilization

Systems for CO2 Utilization: Property Measurement and Electrocatalytic Conversion.
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245 1 0 $a Systems for CO2 Utilization: Property Measurement and Electrocatalytic Conversion.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2021
300 $a 202 p.
500 $a Source: Dissertations Abstracts International, Volume: 82-09, Section: B.
500 $a Advisor: Sinton, David.
502 $a Thesis (Ph.D.)--University of Toronto (Canada), 2021.
506 $a This item must not be sold to any third party vendors.
520 $a Carbon dioxide (CO2) emissions account for approximately 80% of anthropogenic contributions to greenhouse gas emissions and there is a growing need for CO2 utilization strategies. CO2 at supercritical conditions can be employed as a green solvent for extractions and separations, or can be injected in the subsurface for storage. CO2 can also be used as a reactant, a raw material to be converted into valuable chemicals via electrocatalysis. It is likely that all such approaches are needed, and more, to substantially reduce greenhouse gas emissions. The study of the physical and chemical properties of CO2 informs these climate-critical CO2 mitigation approaches.Understanding the CO2 phase behavior of complex fluid mixtures - liquid, gas, supercritical - at different thermodynamic conditions is essential to many industrial and chemical processes. In this work a phase behavior measuring chip was developed that can simultaneously determine the phase behavior of fluids at multiple combinations of temperature and pressure within the application's scope. This phase chip testing method demonstrated a hundredfold decrease in the processing time comparing to the current industrial testing processes while maintaining experimental resolution and high accuracy (Chapter 3). At the same time, this work provides a platform for exploring CO2 mixture phase behavior, interface behavior, and mass transport.Electrochemical reduction of CO2 to valuable liquid fuels and chemical feedstocks is a sustainable approach to intermittent electricity utilization. Gas diffusion heterogeneous reaction electrodes facilitate effective CO2 mass transport to the catalyst, enabling electrolyzers to operate at the current densities required for industrial deployment. However, the complex interactions between a solid catalyst, liquid electrolyte, and gas reagents of heterogeneous electrodes significantly influence the CO2 reduction reaction (CO2RR) performance. This work focuses on CO2 local availabilities/pressure (Chapter 4), microstructure wetting capabilities (Chapter 4), pH distribution (Chapter 5), and electromigration (Chapter 5) with the goal of improving the performance of the CO2 reduction reaction (CO2RR) in practical systems. Together these efforts improve efficiencies, selectivities, and current densities of CO2 electrocatalytic systems, and advance the field of CO2 utilization more generally.
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650 4 $a Chemical engineering. $3 560457
650 4 $a Fluid mechanics. $3 528155
653 $a Carbon dioxide utilization
653 $a CO2 reduction
653 $a Electrocatalysis
653 $a Microfluidics
653 $a Phase properties
653 $a Renewable energy
690 $a 0791
690 $a 0542
690 $a 0204
710 2 $a University of Toronto (Canada). $b Mechanical and Industrial Engineering. $3 2100959
773 0 $t Dissertations Abstracts International $g 82-09B.
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791 $a Ph.D.
792 $a 2021
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28265178