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Integrated photovoltaic-electrochemical system for carbon dioxide reduction

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thesis
posted on 23.11.2022, 00:21 authored by Zhiwei Shen

The rapid increase in carbon dioxide (CO2) has recently become a social focus. Converting CO2 to value-added fuels with CO2 electrochemical reduction reaction (CO2ERR) is an attractive method to reduce CO2. Photovoltaic-electrochemical (PV-EC) integrated systems enable to drive CO2ERR with renewable electricity. However, PV-EC integrated systems have different optimal conditions depending on systems configuration. The aim of this Master thesis is to design a PV-EC system with a voltage regulator component, which facilitates the system operating at the desired potential for CO2ERR. Effects of various operating parameters were investigated. A maximum Faradaic efficiency of CO (FECO, 90%) was obtained under the optimal 1-h CO2ERR conditions with a potential of -1.25V vs. NHE, a CO2 flow rate of 20 mL/min, 0.5M KHCO3 electrolyte in a reversely assembled flow cell. A stable FECO of ca. 95% was reached for a 4-h long electrolysis under the optimal conditions. When the electrolyser was driven by a silicon solar cell under the identical conditions, a FECO of 57% was achieved. The drop in FECO can be explained by the energy loss in between the PV and EC components. This thesis gives an insight to further improve PV-EC systems to be stably operated under optimal conditions.  

History

Table of Contents

1 Introduction -- 2 Literature review -- 3 Experimental methods -- 4 Results and discussion -- 5 Conclusions and future work

Awarding Institution

Macquarie University

Degree Type

Thesis MRes

Degree

Thesis (MRes), Macquarie University, Faculty of Science and Engineering, School of Engineering, 2022

Department, Centre or School

School of Engineering

Year of Award

2022

Principal Supervisor

Yijiao Jiang

Rights

Copyright: The Author Copyright disclaimer: https://www.mq.edu.au/copyright-disclaimer

Language

English

Extent

39 pages