Full metadata record
| DC Field | Value | Language |
|---|---|---|
| dc.contributor | Department of Mechanical Engineering | en_US |
| dc.contributor.advisor | An, Liang (ME) | en_US |
| dc.creator | Bai, Yuran | - |
| dc.identifier.uri | https://theses.lib.polyu.edu.hk/handle/200/14089 | - |
| dc.language | English | en_US |
| dc.publisher | Hong Kong Polytechnic University | en_US |
| dc.rights | All rights reserved | en_US |
| dc.title | Operation of fuel cells under extreme conditions | en_US |
| dcterms.abstract | In the last decades, liquid fuel cells, attributed to their intrinsic advantages including simple structure, instant recharging, and high energy density, have attracted much attention around the world. However, restricted by the sluggish reaction kinetics of liquid fuels even on noble metal catalysts, their cell performance is still far from satisfactory, which thus greatly hindered their commercialization. Recently, an electrically rechargeable liquid fuel (e-fuel) was proposed, which could be made of various electroactive substances including inorganic materials, organic materials, and suspensions of particles. The e-fuel possesses many advantages such as superior reactivity, low freezing point and rechargeability, showing great potential for wide application. Nevertheless, confined by the need of gaseous oxygen as the oxidant during the cell operation, its application scenario is still limited. To address this issue, in this work, hydrogen peroxide, as a substitution for oxygen, is applied for powering the e-fuel cell. It not only could provide the cell with a higher theoretical voltage, but also avoid the water flooding problem on the cathode. The effects of the operating conditions on the cell components, including fuel, oxidant, membrane, and electrode are first explored. The optimal composition of the oxidant and the current collector design are also determined. Overall, the passive H₂O₂-based fuel cell is found to achieve a peak power density of 72.9 mW cm⁻² and a maximum current density of 220 mA cm⁻² in an oxygen-free environment. More impressively, a peak power density of 31.74 mW cm⁻² is reached even at -20 °C without any external heating equipment. The successful operation of the liquid fuel cell under such extreme conditions demonstrates its huge potential for future applications. | en_US |
| dcterms.extent | 53 pages : color illustrations | en_US |
| dcterms.isPartOf | PolyU Electronic Theses | en_US |
| dcterms.issued | 2024 | en_US |
| dcterms.educationalLevel | M.Sc. | en_US |
| dcterms.educationalLevel | All Master | en_US |
| dcterms.accessRights | restricted access | en_US |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| 8578.pdf | For All Users (off-campus access for PolyU Staff & Students only) | 2.46 MB | Adobe PDF | View/Open |
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