Improved Maximum Power Density of Alkaline Membrane Fuel Cells (AMFCs) by the Optimization of MEA Construction

2019 ◽  
Vol 28 (30) ◽  
pp. 221-225 ◽  
Author(s):  
Kenji Fukuta ◽  
Hiroshi Inoue ◽  
Yohei Chikashige ◽  
Hiroyuki Yanagi
Keyword(s):  
Fuel Cells ◽  
Power Density ◽  
Maximum Power ◽  
Maximum Power Density ◽  
Alkaline Membrane

scholarly journals Natural Wolframite Used as Cathode Photocatalyst for Improving the Performance of Microbial Fuel Cells

2018 ◽  
Vol 8 (12) ◽  
pp. 2504
Author(s):  
Junxian Shi ◽  
Anhuai Lu ◽  
Haibin Chu ◽  
Hongyu Wu ◽  
Hongrui Ding
Keyword(s):  
Fuel Cells ◽  
Power Density ◽  
Microbial Fuel Cells ◽  
Environmental Remediation ◽  
Low Cost ◽  
Reduction Process ◽  
Maximum Power ◽  
Maximum Power Density ◽  
Graphite Cathode ◽  
Vis Spectroscopy

Developing simple and cheap electrocatalysts or photocatalysts for cathodes to increase the oxygen reduction process is a key factor for better utilization of microbial fuel cells (MFCs). Here, we report the investigation of natural wolframite employed as a low-cost cathode photocatalyst to improve the performance of MFCs. The semiconducting wolframite was characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), and Raman spectroscopy. The band gap and photo respond activities were determined by UV-vis spectroscopy and linear sweep voltammetry (LSV), respectively. Compared with the normal graphite cathode, when MFCs were equipped with a wolframite-coated cathode, the maximum power density was increased from 41.47 mW·m−2 to 95.51 mW·m−2. Notably, the maximum power density further improved to 135.57 mW·m−2 under light irradiation, which was 2.4 times higher than with a graphite cathode. Our research demonstrated that natural wolframite, a low-cost and abundant natural semiconducting mineral, showed promise as an effective photocathode catalyst which has great potential applications related to utilizing natural minerals in MFCs and for environmental remediation by MFCs in the future.

Low-Temperature Operating Micro Solid Oxide Fuel Cells with Perovskite-type Proton Conductors

2011 ◽  
Vol 1330 ◽  
Author(s):  
Hiroo Yugami ◽  
Kensuke Kubota ◽  
Yu Inagaki ◽  
Fumitada Iguchi ◽  
Shuji Tanaka ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Low Temperature ◽  
Solid Oxide Fuel Cells ◽  
Power Density ◽  
Proton Conductors ◽  
Solid Oxide ◽  
Maximum Power ◽  
Barium Zirconate ◽  
Oxide Fuel ◽  
Maximum Power Density

ABSTRACTMicro-solid oxide fuel cells (Micro-SOFCs) with yttrium-doped barium zirconate (BZY) and strontium and cobalt-doped lanthanum scandate (LSScCo) electrolytes were fabricated for low-temperature operation at 300 °C. The micro-SOFC with a BZY electrolyte could operate at 300 °C with an open circuit voltage (OCV) of 1.08 V and a maximum power density of 2.8 mW/cm2. The micro-SOFC with a LSScCo electrolyte could operate at 370 °C; its OCV was about 0.8 V, and its maximum power density was 0.6 mW/cm2. Electrochemical impedance spectroscopy revealed that the electrolyte resistance in both the micro-SOFCs was lower than 0.1 Ωcm2, and almost all of the resistance was due to anode and cathode reactions. Although the obtained maximum power density was not sufficient for practical applications, improvement of electrodes will make these micro-SOFCs promising candidates for power sources of mobile electronic devices.

Nitrogen and sulfur dual-doped graphene as an efficient metal-free electrocatalyst for the oxygen reduction reaction in microbial fuel cells

2019 ◽  
Vol 43 (24) ◽  
pp. 9389-9395 ◽  
Author(s):  
Cuie Zhao ◽  
Jinxiang Li ◽  
Yan Chen ◽  
Jianyu Chen
Keyword(s):  
Fuel Cells ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Power Density ◽  
Microbial Fuel Cells ◽  
Reduction Reaction ◽  
Maximum Power ◽  
Maximum Power Density ◽  
Metal Free ◽  
Doped Graphene

In this study, nitrogen- and sulfur-codoped graphene (N/S-G) was prepared and used as an efficient metal-free electrocatalyst for the oxygen reduction reaction (ORR) in microbial fuel cells (MFCs), exhibiting a maximum power density of 1368 mW m−2, relatively higher than that of commercial Pt/C.

Study of the electrooxidation of borohydride on a directly formed CoB/Ni-foam electrode and its application in membraneless direct borohydride fuel cells

2017 ◽  
Vol 5 (30) ◽  
pp. 15879-15890 ◽  
Author(s):  
Siqi Guo ◽  
Jie Sun ◽  
Zhengyan Zhang ◽  
Aokai Sheng ◽  
Ming Gao ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Power Density ◽  
Electroless Plating ◽  
Maximum Power ◽  
Maximum Power Density ◽  
Ni Foam ◽  
Plating Method ◽  
Direct Borohydride Fuel Cells ◽  
Electroless Plating Method

CoB/Ni-foam was directly formed on a Ni-foam substrate using the electroless plating method. A membraneless DBFC with CoB/Ni-foam (7EP) as an anode showed a maximum power density of 230 mW cm−2.

A direct carbon fuel cell with a CuO–ZnO–SDC composite anode

RSC Advances ◽  
2016 ◽  
Vol 6 (55) ◽  
pp. 50201-50208 ◽  
Author(s):  
Wenbin Hao ◽  
Yongli Mi
Keyword(s):  
Fuel Cells ◽  
Fuel Cell ◽  
Power Density ◽  
Anode Material ◽  
Maximum Power ◽  
Maximum Power Density ◽  
Composite Anode ◽  
Direct Carbon Fuel Cell ◽  
Direct Carbon Fuel Cells

A direct carbon fuel cell with a CuO–ZnO–SDC composite anode was demonstrated. The maximum power density was 130 mW cm−2 at 700 °C. The results indicate that CuO–ZnO can be used as a nickel-free anode material for direct carbon fuel cells.

Increasing the Operating Temperature of Nafion Membranes with Addition of Nanocrystalline Oxides for Direct Methanol Fuel Cells

2002 ◽  
Vol 756 ◽  
Author(s):  
Vincenzo Baglio ◽  
Alessandra Di Blasi ◽  
Antonino S. Arico' ◽  
Vincenzo Antonucci ◽  
Pier Luigi Antonucci ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Power Density ◽  
Direct Methanol Fuel Cells ◽  
Maximum Power ◽  
Nafion Membrane ◽  
Membrane Electrode ◽  
Maximum Power Density ◽  
Nafion Membranes ◽  
Direct Methanol ◽  
Methanol Fuel Cells

ABSTRACTComposite Nafion membranes containing various amounts of TiO2 (3%, 5% and 10%) were prepared by using a recast procedure for application in high temperature Direct Methanol Fuel Cells (DMFCs). The electrochemical behaviour was compared to that of a membrane-electrode assembly (MEA) based on a bare recast Nafion membrane. All the MEAs containing the Nafion-titania membranes were able to operate up to 145°C, whereas the assembly equipped with the bare recast Nafion membrane showed the maximum performance at 120°C. A maximum power density of 340 mW cm-2 was achieved at 145°C with the composite membrane in the presence of oxygen feed, whereas the maximum power density with air feed was about 210 mW cm-2.

scholarly journals Designing Carbon/Oxygen Ratios of Graphene Oxide Membranes for Proton Exchange Membrane Fuel Cells

2019 ◽  
Vol 2019 ◽  
pp. 1-9 ◽  
Author(s):  
Minwoo Ahn ◽  
Renlong Liu ◽  
Changgu Lee ◽  
Wonyoung Lee
Keyword(s):  
Graphene Oxide ◽  
Fuel Cells ◽  
Power Density ◽  
Proton Conductivity ◽  
Proton Exchange Membrane ◽  
Proton Exchange ◽  
Maximum Power ◽  
Maximum Power Density ◽  
Exchange Membrane ◽  
Interfacial Reactivity

Graphene oxide (GO), which is the oxidized form of graphene, has holes and functional groups on the surface and thus has high potential to be used as an electrochemical transport channel material. In this study, differently modified GO membranes are applied as electrolytes of proton exchange membrane fuel cells (PEMFCs) with controlled carbon/oxygen ratios. The critical and desired properties of the electrolyte, such as electron conductivity, proton conductivity, interfacial reactivity, and cell performance are evaluated in identical platinum-sputtered model electrodes. Among them, with the help of an increased concentration of oxygen-containing groups, a GO membrane with a low carbon/oxygen ratio shows a 2.9-fold improved maximum power density and advanced electrochemical properties compared with the pristine GO membrane. The characterization of GO suggests that the redox state of the membrane is an important factor for controlling the proton conductivity, interfacial reactivity, and maximum power density of PEMFCs.

Effect of Flow Fields and Scan Rates on Performance of Micro-DMFC

2010 ◽  
Vol 654-656 ◽  
pp. 2879-2882
Author(s):  
Yu Hao Lu ◽  
Ramana G. Reddy
Keyword(s):  
Fuel Cells ◽  
Power Density ◽  
Direct Methanol Fuel Cells ◽  
Flow Fields ◽  
Maximum Power ◽  
Maximum Power Density ◽  
Bipolar Plates ◽  
Narrow Channels ◽  
Direct Methanol ◽  
Mems Technology

A micro-DMFC is a promising power source to substitute the lithium battery and used in the portable electronic devices. In this study, the effect of four types of flow fields of bipolar plates in a micro-direct methanol fuel cells (micro-DMFCs) on their performance were experimentally investigated. MEMS technology was applied in fabrication of micro-channel for the micro-DMFCs. The effect of the type of flow field design on the performance of micro-DMFCs was electrochemically evaluated for the four types of flow fields. The micro-DMFCs with double-channel serpentine presented the highest maximum power density and the micro-fuel cells with mixed multi-channel serpentine with narrow channels had the lowest maximum power density.

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