Moisture Elimination of the Wet Hydrogen Gas Using the Electrochemical Hydrogen Compressor with a Modified MEA Composition

2017 ◽  
Vol 737 ◽  
pp. 354-359
Author(s):  
Ha Yeon Jeong ◽  
Sol Ah Jeon ◽  
Hyo Nam Jeong ◽  
Sun Ho Go ◽  
Min Sang Lee ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Proton Exchange Membrane ◽  
Modified Electrodes ◽  
Hydrogen Gas ◽  
Proton Exchange ◽  
Water Molecules ◽  
Catalytic Layer ◽  
Membrane Electrodes ◽  
Performance Loss ◽  
Exchange Membrane

The electrochemical hydrogen compressor (EHC) is used as a moisture elimination tool for the wet hydrogen gas. As the pressure of cathode compartment increases, the moisture contents of hydrogen decrease, however, the electrochemical performance of the compression cell is deteriorated. In the high enough pressure difference conditions between anode and cathode the electrochemical performance loss results mainly from the dehydration of the proton exchange membrane. In this article the MEA (membrane electrodes assembly) is modified to keep the water molecules not only in the membrane but also in the cathode catalytic layer. Then the electrochemical performance of the hydrogen compression cell is measured with the moisture elimination ability. The variously modified MEAs are tested and the surfaces of modified electrodes are pictured by scanning electron microscope.

Novel Proton Exchange Membrane for High Temperature Fuel Cells

1997 ◽  
Vol 496 ◽  
Author(s):  
M. Bhamidipati ◽  
E. Lazaro ◽  
F. Lyons ◽  
R. S. Morris
Keyword(s):  
Thermal Stability ◽  
Fuel Cells ◽  
High Temperature ◽  
Electrochemical Performance ◽  
Proton Exchange Membrane ◽  
Research Effort ◽  
Analysis Data ◽  
Proton Exchange ◽  
Temperature Conductivity ◽  
Exchange Membrane

ABSTRACTThis research effort sought to demonstrate that combining select phosphonic acid additives with Nafion could improve Nafion's high temperature electrochemical performance. A 1:1 mixture of the additive with Nafion, resulted in a film that demonstrated 30% higher conductivity than a phosphoric acid equilibrated Nafion control at 175°C. This improvement to the high temperature conductivity of the proton exchange membrane Nafion is without precedent. In addition, thermal analysis data of the test films suggested that the additives did not compromise the thermal stability of Nafion. The results suggest that the improved Nafion proton exchange membranes could offer superior electrochemical performance, but would retain the same degree of thermal stability as Nafion. This research could eventually lead to portable fuel cells that could oxidize unrefined hydrocarbon fuels, resulting in wider proliferation of fuel cells for portable power.

scholarly journals Graphene Supported Rhodium Nanoparticles for Enhanced Electrocatalytic Hydrogen Evolution Reaction

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Ameerunisha Begum ◽  
Moumita Bose ◽  
Golam Moula
Keyword(s):  
Proton Exchange Membrane ◽  
Sem Analysis ◽  
Hydrogen Gas ◽  
Proton Exchange ◽  
Experimental Conditions ◽  
Tem Analysis ◽  
Onset Potential ◽  
Rhodium Nanoparticles ◽  
Reduction Potentials ◽  
Exchange Membrane

AbstractCurrent research on catalysts for proton exchange membrane fuel cells (PEMFC) is based on obtaining higher catalytic activity than platinum particle catalysts on porous carbon. In search of a more sustainable catalyst other than platinum for the catalytic conversion of water to hydrogen gas, a series of nanoparticles of transition metals viz., Rh, Co, Fe, Pt and their composites with functionalized graphene such as RhNPs@f-graphene, CoNPs@f-graphene, PtNPs@f-graphene were synthesized and characterized by SEM and TEM techniques. The SEM analysis indicates that the texture of RhNPs@f-graphene resemble the dispersion of water droplets on lotus leaf. TEM analysis indicates that RhNPs of <10 nm diameter are dispersed on the surface of f-graphene. The air-stable NPs and nanocomposites were used as electrocatalyts for conversion of acidic water to hydrogen gas. The composite RhNPs@f-graphene catalyses hydrogen gas evolution from water containing p-toluene sulphonic acid (p-TsOH) at an onset reduction potential, Ep, −0.117 V which is less than that of PtNPs@f-graphene (Ep, −0.380 V) under identical experimental conditions whereas the onset potential of CoNPs@f-graphene was at Ep, −0.97 V and the FeNPs@f-graphene displayed onset potential at Ep, −1.58 V. The pure rhodium nanoparticles, RhNPs also electrocatalyse at Ep, −0.186 V compared with that of PtNPs at Ep, −0.36 V and that of CoNPs at Ep, −0.98 V. The electrocatalytic experiments also indicate that the RhNPs and RhNPs@f-graphene are stable, durable and they can be recycled in several catalytic experiments after washing with water and drying. The results indicate that RhNPs and RhNPs@f-graphene are better nanoelectrocatalysts than PtNPs and the reduction potentials were much higher in other transition metal nanoparticles. The mechanism could involve a hydridic species, Rh-H− followed by interaction with protons to form hydrogen gas.

scholarly journals Effects of the Chemical Treatment on the Physical-Chemical and Electrochemical Properties of the Commercial Nafion™ NR212 Membrane

Materials ◽  
2020 ◽  
Vol 13 (22) ◽  
pp. 5254
Author(s):  
Enza Passalacqua ◽  
Rolando Pedicini ◽  
Alessandra Carbone ◽  
Irene Gatto ◽  
Fabio Matera ◽  
...  
Keyword(s):  
Proton Exchange Membrane ◽  
Polymer Electrolyte Fuel Cells ◽  
Proton Exchange ◽  
Mechanical Resistance ◽  
Water Molecules ◽  
Chemical Agents ◽  
Pre Treatment ◽  
Main Component ◽  
Power Generation Systems ◽  
Exchange Membrane

Polymer Electrolyte Fuel Cells (PEFCs) are one of the most promising power generation systems. The main component of a PEFC is the proton exchange membrane (PEM), object of intense research to improve the efficiency of the cell. The most commonly and commercially successful used PEMs are Nafion™ perfluorosulfonic acid (PFSA) membranes, taken as a reference for the development of innovative and alternative membranes. Usually, these membranes undergo different pre-treatments to enhance their characteristics. With the aim of understanding the utility and the effects of such pre-treatments, in this study, a commercial Nafion™ NR212 membrane was subjected to two different chemical pre-treatments, before usage. HNO3 or H2O2 were selected as chemical agents because the most widely used ones in the procedure protocols in order to prepare the membrane in a well-defined reference state. The pre-treated membranes properties were compared to an untreated membrane, used as-received. The investigation has showed that the pre-treatments enhance the hydrophilicity and increase the water molecules coordinated to the sulphonic groups in the membrane structure, on the other hand the swelling of the membranes also increases. As a consequence, the untreated membrane shows a better mechanical resistance, a good electrochemical performance and durability in fuel cell operations, orienting toward the use of the NR212 membrane without any chemical pre-treatment.

C121 Measurement of Hydrogen-gas permeation property in Proton Exchange Membrane by NMR technique

2012 ◽  
Vol 2012.17 (0) ◽  
pp. 101-102
Author(s):  
Ryosuke NAGAHISA ◽  
Daiki KURIYA ◽  
Kuniyasu OGAWA ◽  
Yasuyuki TAKATA ◽  
Kohei ITO
Keyword(s):  
Proton Exchange Membrane ◽  
Gas Permeation ◽  
Hydrogen Gas ◽  
Proton Exchange ◽  
Exchange Membrane

scholarly journals Kilowatt-Scale Fuel Cell Systems Powered by Recycled Aluminum

2020 ◽  
Vol 18 (1) ◽  
Author(s):  
Peter Godart ◽  
Jason Fischman ◽  
Douglas Hart
Keyword(s):  
Fuel Cell ◽  
Power System ◽  
Proton Exchange Membrane ◽  
Electrical Power ◽  
Hydrogen Gas ◽  
Proton Exchange ◽  
Hydrogen Fuel Cell ◽  
Cell Systems ◽  
Scrap Aluminum ◽  
Exchange Membrane

Abstract Presented here is a novel system that uses an aluminum-based fuel to continuously produce electrical power at the kilowatt scale via a hydrogen fuel cell. This fuel has an energy density of 23.3 kW h/L and can be produced from abundant scrap aluminum via a minimal surface treatment of gallium and indium. These additional metals, which in total comprise 2.5% of the fuel’s mass, permeate the grain boundary network of the aluminum to disrupt its oxide layer, thereby enabling the fuel to react exothermically with water to produce hydrogen gas and aluminum oxyhydroxide (AlOOH), an inert and valuable byproduct. To generate electrical power using this fuel, the aluminum–water reaction is controlled via water input to a reaction vessel in order to produce a constant flow of hydrogen, which is then consumed in a fuel cell to produce electricity. As validation of this power system architecture, we present the design and implementation of two proton-exchange membrane (PEM) fuel cell systems that successfully demonstrate this approach. The first is a 3 kW emergency power supply, and the second is a 10 kW power system integrated into a BMW i3 electric vehicle.

scholarly journals Influence of PtCu/C Catalysts Composition on Electrochemical Characteristics of Polymer Electrolyte Fuel Cell and Properties of Proton Exchange Membrane

Catalysts ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 1063
Author(s):  
Irina Falina ◽  
Angelina Pavlets ◽  
Anastasia Alekseenko ◽  
Ekaterina Titskaya ◽  
Natalia Kononenko
Keyword(s):  
Proton Exchange Membrane ◽  
Copper Ions ◽  
Membrane Electrode Assembly ◽  
Proton Exchange ◽  
Polymer Electrolyte Fuel Cell ◽  
Membrane Electrode ◽  
Catalytic Layer ◽  
Electrochemical Characteristics ◽  
Weakly Bound ◽  
Exchange Membrane

The present work aimed to investigate the influence of “weakly bound“ copper dissolution from the surface of bimetallic PtCux/C catalysts on the properties of proton exchange membrane and the membrane electrode assembly (MEA) in general. A number of PtCux/C materials have been obtained by the simultaneous reduction in copper and platinum precursors in the course of liquid-phase synthesis with a varying ratio of metals from PtCu2.0/C to PtCu0.3/C. All bimetallic PtCux/C electrocatalysts after the activation stage exhibit high activity in the oxygen electroreduction reaction. The PtCux/C catalysts in “as prepared” state were tested in MEA. The increase in Cu content in PtCux/C catalysts led to a decrease in current density of MEA while its resistance was almost independent of the Cu fraction in the catalyst. The membrane saturation degree by Cu2+-ions after MEA testing did not exceed 40%, even in the case of the PtCu2.0/C material. The main reason for the degradation of membrane electrode assembly with PtCux/C materials is the transport limitation caused by the contamination of Nafion in three catalytic layer by “weakly bound” copper ions.

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