Enhanced Graphite Fiber Electrodes for a Microbial Biofuel Cell Employing Marine Sediments

2002 ◽  
Vol 756 ◽  
Author(s):  
Gregory Konesky
Keyword(s):  
Graphite Electrode ◽  
Collection Efficiency ◽  
Biofuel Cell ◽  
Hydrogen Ions ◽  
Graphite Fiber ◽  
Graphite Electrodes ◽  
Permeable Membrane ◽  
Produce Water ◽  
Microbial Biofuel ◽  
Green Fuel

ABSTRACTA microbial biofuel cell has been demonstrated utilizing organic material in the sediment as fuel and dissolved oxygen in the overlying seawater as the oxidizer. A graphite electrode placed in the sediment acts as the anode and collects electrons both by mediated and non-mediated processes. Another graphite electrode suspended in the seawater above the sediment acts as the cathode and transfers these electrons to oxygen in the seawater. The sediment serves as a natural permeable membrane that permits hydrogen ions to flow from within the sediment and combine with the oxygen to produce water. Electrons which flow from the anode to the cathode through an interconnecting wire are used to power external circuits. Both fuel and oxidizer are naturally present and self-renewing, and the graphite electrodes are inexpensive and non-toxic. Overall, this is a very “green” fuel cell. A significant improvement in collection efficiency is demonstrated by using graphite fiber electrodes.

Electrolytic Behavior Silver Microphases and Nanophases on the Graphite Electrode Surface

2016 ◽  
Vol 712 ◽  
pp. 117-122 ◽  
Author(s):  
Daria O. Perevezentseva ◽  
Eduard Gorchakov ◽  
Yulia A. Oskina
Keyword(s):  
Silver Nanoparticles ◽  
Silver Oxide ◽  
Graphite Electrode ◽  
Reducing Agent ◽  
Molar Ratio ◽  
Graphite Electrodes ◽  
Stepwise Mechanism ◽  
Voltage Curve ◽  
Current Voltage ◽  
Current Voltage Curve

The stepwise mechanism of electrooxidation and reduction of silver nanophases and microphases is proposed on the graphite electrodes surface in alkaline medium. The electrochemical splitting of silver nanophases peak is observed on the anodic branch of the cyclic current-voltage curve. There is the shoulder at E = 0.2 V on the he anodic branch of cyclic current-voltage curve. The appearance of additional cathodic wave at E = -0.08 V is observed on the cathodic branch of the cyclic current-voltage curve that is caused by the reduction of silver nanoparticles. The additional cathode maximum is represented at 0.3 V on the cathodic branch of the cylic current-voltage curves of only silver nanophases. This effect is associated the catalytic process of decomposition of hydrogen peroxide on silver nanoparticles surface. The offset of the cathodic maxima of current-voltage curves of silver nanophases obtained with an excess of a reducing agent are observed to more negative potentials. There is a significant decrease of the all currents maxima compared to silver nanophases obtained with an equal molar ratio of reactants. These results may be connected with the formation of silver oxide monolayers in the different oxidation in the presence of large amounts a reducing agent. The excess of the reducing agent required for the preparation of silver nanoparticles leads to decrease of the cathodic maximum of silver nanoparticles

scholarly journals Evidence for Involvement of an Electron Shuttle in Electricity Generation by Geothrix fermentans

2005 ◽  
Vol 71 (4) ◽  
pp. 2186-2189 ◽  
Author(s):  
Daniel R. Bond ◽  
Derek R. Lovley
Keyword(s):  
Organic Compounds ◽  
Electricity Generation ◽  
Graphite Electrode ◽  
Electricity Production ◽  
Electron Shuttle ◽  
Complete Oxidation ◽  
Electrical Characteristics ◽  
Graphite Electrodes ◽  
Oxidation Of Organic Compounds ◽  
Geothrix Fermentans

ABSTRACT In experiments performed using graphite electrodes poised by a potentiostat (+200 mV versus Ag/AgCl) or in a microbial fuel cell (with oxygen as the electron acceptor), the Fe(III)-reducing organism Geothrix fermentans conserved energy to support growth by coupling the complete oxidation of acetate to reduction of a graphite electrode. Other organic compounds, such as lactate, malate, propionate, and succinate as well as components of peptone and yeast extract, were utilized for electricity production. However, electrical characteristics and the results of shuttling assays indicated that unlike previously described electrode-reducing microorganisms, G. fermentans produced a compound that promoted electrode reduction. This is the first report of complete oxidation of organic compounds linked to electrode reduction by an isolate outside of the Proteobacteria.

scholarly journals Determination of Heavy Metals in Herbal Food Supplements using Bismuth/Multi-walled Carbon Nanotubes/Nafion modified Graphite Electrodes sourced from Waste Batteries

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Shirley Palisoc ◽  
Remuel Isaac M. Vitto ◽  
Michelle Natividad
Keyword(s):  
Carbon Nanotubes ◽  
Heavy Metal ◽  
Heavy Metal Contamination ◽  
Graphite Electrode ◽  
Anodic Stripping Voltammetry ◽  
Graphite Electrodes ◽  
Bismuth Nanoparticles ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

AbstractAn electrochemical sensor based on graphite electrode extracted from waste zinc-carbon battery is developed. The graphite electrode was modified with bismuth nanoparticles (BiNP), multi-walled carbon nanotubes (MWCNT) and Nafion via the drop coating method. The bare and modified graphite electrodes were used as the working electrode in anodic stripping voltammetry for the determination of trace amounts of cadmium (Cd2+) and lead (Pb2+). The modified electrode exhibited excellent electroanalytical performance for heavy metal detection in comparison with the bare graphite electrode. The linear concentration range from 5 parts per billion (ppb) to 1000 ppb (R2 = 0.996), as well as detection limits of 1.06 ppb for Cd2+ and 0.72 ppb for Pb2+ were obtained at optimized experimental conditions and parameters. The sensor was successfully utilized for the quantification of Cd2+ and Pb2+ in herbal food supplement samples with good agreement to the results obtained by atomic absorption spectroscopy. Thus, the BiNP/MWCNT/Nafion modified graphite electrode is a cost-effective and environment-friendly sensor for monitoring heavy metal contamination.

Cheap pencil graphite electrodes for rapid voltammetric determination of chlorogenic acid in dietary supplements

2016 ◽  
Vol 8 (35) ◽  
pp. 6537-6544 ◽  
Author(s):  
I. G. David ◽  
D. E. Popa ◽  
M. Buleandra ◽  
Z. Moldovan ◽  
E. E. Iorgulescu ◽  
...  
Keyword(s):  
Chlorogenic Acid ◽  
Dietary Supplements ◽  
Graphite Electrode ◽  
Voltammetric Determination ◽  
Pencil Graphite Electrode ◽  
Green Coffee ◽  
Graphite Electrodes ◽  
First Time

A disposable pencil graphite electrode was used for the first time for rapid voltammetric determination of chlorogenic acid in green coffee dietary supplements.

A microbial biofuel cell with an air-breathing cathode for in vivo glucose sensing applications

2015 ◽  
Vol 7 (8) ◽  
pp. 3324-3326 ◽  
Author(s):  
Jin Wook Lee
Keyword(s):  
Glucose Sensing ◽  
Baker’S Yeast ◽  
Biofuel Cell ◽  
Baker's Yeast ◽  
Air Breathing ◽  
Sensing Applications ◽  
Microbial Biofuel

A hybrid biofuel cell employing baker's yeast and an abiotic cathode was designed and experimented.

Direct electrochemical deposition of polyaniline nanowire array on reduced graphene oxide modified graphite electrode for direct electron transfer biocatalysis

RSC Advances ◽  
2015 ◽  
Vol 5 (113) ◽  
pp. 93209-93214 ◽  
Author(s):  
Lin Xia ◽  
Jianfei Xia ◽  
Zonghua Wang
Keyword(s):  
Electron Transfer ◽  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Electrochemical Deposition ◽  
Graphite Electrode ◽  
Direct Electron Transfer ◽  
Nanowire Array ◽  
Graphite Electrodes ◽  
Reduced Graphene

Direct electron transfer biocatalysis was achieved via electrochemically produced ordered PANI nanowire array on reduced graphene oxide modified graphite electrodes.

Regulation of radicals from electrochemical exfoliation of a double-graphite electrode to fabricate high-quality graphene

2018 ◽  
Vol 6 (23) ◽  
pp. 6257-6263 ◽  
Author(s):  
Le Li ◽  
Minqiang Wang ◽  
Jun Guo ◽  
Minghui Cao ◽  
Hengwei Qiu ◽  
...  
Keyword(s):  
Free Radicals ◽  
Oxygen Free Radicals ◽  
Graphite Electrode ◽  
High Quality ◽  
Electrochemical Exfoliation ◽  
Graphite Electrodes

Adjusting oxygen free radicals exfoliated from double graphite electrodes by adding thiourea and lowering the temperature to prepare high quality graphene.

scholarly journals Indigo-Mediated Semi-Microbial Biofuel Cell Using an Indigo-Dye Fermenting Suspension

Catalysts ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 1080
Author(s):  
Mayu Kikuchi ◽  
Keisei Sowa ◽  
Kasumi Nakagawa ◽  
Momoka Matsunaga ◽  
Akinori Ando ◽  
...  
Keyword(s):  
Power Density ◽  
Maximum Output Power ◽  
Gas Diffusion ◽  
Open Circuit ◽  
Biofuel Cell ◽  
Maximum Output ◽  
Alkaline Conditions ◽  
Indigo Dye ◽  
Microbial Biofuel ◽  
Dispersion Solution

Aizome (Japanese indigo dyeing) is a unique dyeing method using microbial activity under anaerobic alkaline conditions. In indigo-dye fermenting suspensions; microorganisms reduce indigo into leuco-indigo with acetaldehyde as a reductant. In this study; we constructed a semi-microbial biofuel cell using an indigo-dye fermenting suspension. Carbon fiber and Pt mesh were used as the anode and cathode materials, respectively. The open-circuit voltage (OCV) was 0.6 V, and the maximum output power was 32 µW cm−2 (320 mW m−2). In addition, the continuous stability was evaluated under given conditions starting with the highest power density; the power density rapidly decreased in 0.5 h due to the degradation of the anode. Conversely, at the OCV, the anode potential exhibited high stability for two days. However, the OCV decreased by approximately 80 mV after 2 d compared with the initial value, which was attributed to the performance degradation of the gas-diffusion-cathode system caused by the evaporation of the dispersion solution. This is the first study to construct a semi-microbial biofuel cell using an indigo-dye fermenting suspension.

Sign in / Sign up

Export Citation Format

Share Document