Factors affecting the longterm stability of biomass and hydrogen productivity in outdoor photofermentation

Androga, Dominic Deo
Ozgur, Ebru
Guncluz, Ufuk
Yucel, Meral
Eroğlu, İnci
In this study, the long-term stability of biomass and hydrogen production on acetate by Rhodobacter capsulatus YO3 (hup(-)) was investigated. The experiments were performed in fed-batch panel photobioreactors operated under the natural sunlight in Ankara, Turkey. They were carried out between October and December in order to resemble low temperature and low light intensity and between July and August in order to resemble high temperature and high light intensity.


Effects of membrane electrode assembly components on proton exchange membrane fuel cell performance
Bayrakceken, Ayse; Erkan, Serdar; Turker, Lemi; Eroğlu, İnci (Elsevier BV, 2008-01-01)
The objective of this study is to determine the effects of various factors on the performance of proton exchange membrane (PEM) fuel cell. These factors are membrane thickness, hot-pressing conditions of the gas diffusion layer (GDL) either onto the membrane or membrane electrode assembly (MEA) and Teflon:carbon ratio in the GDL on PEM fuel cell performance. Homemade five-layer and commercial three-layer MEAs were used in the experiments. Nafion (R) 112 and 115 which have nominal thicknesses of 50 and 125 m...
Pilot-scale outdoor photofermentative hydrogen production from molasses using pH control
Oflaz, F. Betül; Koku, Harun (Elsevier BV, 2020-01-01)
© 2020 Hydrogen Energy Publications LLCThe duration of photofermentative hydrogen production from sugar-based nutrients is limited by gradual acidification caused by the production of organic acids, leading to suboptimal pH. To address this issue, a custom pH control system was built and installed on a 20 L tubular photobioreactor, and operated under outdoor conditions. Long-term, single-stage hydrogen production from molasses was achieved using the purple non-sulfur bacterium, Rhodobacter capsulatus. The r...
Development of non-noble Co–N–C electrocatalyst for high-temperature proton exchange membrane fuel cells
Eren, Enis Oğuzhan; Özkan, Necati; Devrim, Yılser (Elsevier BV, 2020-11-27)
© 2020 Hydrogen Energy Publications LLCThe development of a non-noble Co–N/MWCNT (MWCNT = multi-walled carbon nanotubes) electrocatalyst is achieved through the high-temperature pyrolysis method and successfully characterized by five-step physico-chemical analysis. By utilizing high-resolution analytical surface characterization methods, the chemical states of elements are determined, and the presence of Co-Nx sites is confirmed. ORR activity of a Co–N/MWCNT is found to be auspicious. The maximum number of ...
Enhancement of hydrogen storage capacity of multi-walled carbon nanotubes with palladium doping prepared through supercritical CO2 deposition method
ERÜNAL, EBRU; Ulusal, Fatma; ASLAN, MUSTAFA YASİN; GÜZEL, BİLGEHAN; Üner, Deniz (Elsevier BV, 2018-06-07)
Pd doped Multi-Walled Carbon Nanotubes were prepared via supercritical carbon dioxide deposition method in order to enhance the hydrogen uptake capacity of carbon nanotubes at ambient conditions. A new bipyridyl precursor that enables reduction at moderate conditions was used during preparation of the sample. Both XRD analyses and TEM images confirmed that average Pd nanoparticle size distribution was around 10 nm. Hydrogen adsorption and desorption experiments at room temperature with very low pressures (0...
Comparative study of PV/PEM fuel cell hybrid energy system based on methanol and water electrolysis
Budak, Yagmur; DEVRİM, YILSER (Elsevier BV, 2019-01-01)
In this study, we investigated the comparative analysis of a solar-fuel cell hybrid system based on water and methanol electrolysis. The proposed system comprises PV, electrolyzer and proton exchange membrane fuel cell (PEMFC). The hybrid system is designed to supply the hydrogen (H-2) needed of the PEMFC system and also to fulfill the H-2 requirement of other applications. The actual data of solar irradiation of Izmir, Turkey are used in the simulation. The methanol and water electrolyzers were designed fo...
Citation Formats
D. D. Androga, E. Ozgur, U. Guncluz, M. Yucel, and İ. Eroğlu, “Factors affecting the longterm stability of biomass and hydrogen productivity in outdoor photofermentation,” INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, pp. 11369–11378, 2011, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/50455.