Show simple item record

dc.contributor.authorPankan, Aazraa Oumayyah
dc.date.accessioned2019-01-29T14:16:13Z
dc.date.available2019-01-29T14:16:13Z
dc.date.issued2019-04-27
dc.date.submitted2018-09-28
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/288482
dc.description.abstractA sustainable and low-cost system, namely a photo-bioelectrochemical system (photo-BES), based on the natural blueprint of photosynthetic microorganisms was studied. The aim of this research work is to improve the efficiency of electron transfer of the microorganisms for bioelectricity generation. The first strategy adopted was the evaluation of the exoelectrogenic activity of oxygenic photosynthetic cyanobaterium, Synechococcus elongatus PCC 7942, in biophotovoltaic (BPV) platforms through a comparative performance analysis of bioanode materials. The second approach involved improving the performance of anoxygenic photosynthetic bacterium, Rhodopseudomonas palustris ATCC® 17001™, by varying the ratio of nitrogen to carbon sources (N:C) to maximise both biohydrogen production and exoelectrogenesis for conversion into bioelectricity in photosynthetic microbial fuel cells (photoMFCs). A linear correlation was obtained between average surface roughness/surface area and maximum power density of ITO-coated and graphene/ITO-coated substrates. Graphene/ITO-coated PET bioanodes produced the highest maximum power output of 29±4 μW m-2 in a single chamber BPV device due to improved biofilm formation and improved electrochemical activity. XG Leaf®, also known as graphene paper, helped to bridge the shortcomings of carbon fibres in terms of wettability. The most hydrophilic, 240 μm thick graphene paper, produced the highest maximum power output of 393±20 μW m-2 in a membrane electrode assembly (MEA)-type BPV device, mainly due to reduced electrochemical polarisation. A proof of concept study compared the performance of screen-printed graphene onto a membrane separator against 3D-printed bioanodes coated with carbon nanotubes. One mm thick 3D-printed bioanode was better performing as its structures promoted a much denser biofilm with extensive fibrous extracellular matrix. Using a ratio of N:C=0.20 resulted in higher biohydrogen production and higher exoelectrogenic activity, generating a maximum power output of 361±157 mW m-2 and 2.39±0.13 mW m-2, respectively. This study provided additional insight in improving the electron transfer efficiency, which could be used to further optimise photo-BESs as part of future research and development for sustainable technologies.
dc.description.sponsorshipCambridge Trust
dc.language.isoen
dc.rightsAll rights reserved
dc.rightsAll Rights Reserveden
dc.rights.urihttps://www.rioxx.net/licenses/all-rights-reserved/en
dc.subjectBioenergy
dc.subjectPhoto-bioelectrochemical systems
dc.subjectBiophotovoltaic
dc.subjectPhotosynthetic microbial fuel cell
dc.subjectBioanode materials
dc.subjectNanomaterials
dc.subjectSynechococcus elongatus
dc.subjectRhodopseudomonas palustris
dc.subjectBiohydrogen
dc.subjectBioelectricity
dc.titlePerformance analysis of bioanode materials and the study of the metabolic activity of Rhodopseudomonas palustris in photo-bioelectrochemical systems
dc.typeThesis
dc.type.qualificationlevelDoctoral
dc.type.qualificationnameDoctor of Philosophy (PhD)
dc.publisher.institutionUniversity of Cambridge
dc.publisher.departmentChemical Engineering and Biotechnology
dc.date.updated2019-01-28T20:19:25Z
dc.identifier.doi10.17863/CAM.35769
dc.contributor.orcidPankan, Aazraa Oumayyah [0000-0003-3710-4279]
dc.publisher.collegeSelwyn College
dc.type.qualificationtitlePhD in Chemical Engineering
cam.supervisorFisher, Adrian C
cam.supervisor.orcidFisher, Adrian C [0000-0003-4072-4487]
cam.thesis.fundingfalse
rioxxterms.freetoread.startdate2020-01-29


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record