scholarly journals Pulse Plating of Copper onto Gas Diffusion Layers for the Electroreduction of Carbon Dioxide

MRS Advances ◽  
2017 ◽  
Vol 3 (23) ◽  
pp. 1277-1284 ◽  
Author(s):  
Sujat Sen ◽  
McLain Leonard ◽  
Rajeswaran Radhakrishnan ◽  
Stephen Snyder ◽  
Brian Skinn ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Copper Catalysts ◽  
Gas Diffusion ◽  
Nano Particles ◽  
Carbon Surface ◽  
Air Plasma ◽  
Hydrocarbon Production ◽  
Highly Active ◽  
Diffusion Layers ◽  
Pulse Electroplating

ABSTRACTThis paper discusses a pulse electroplating method for preparing copper (Cu)-coated gas diffusion electrodes (GDEs) for the electrochemical conversion of carbon dioxide (CO2) to hydrocarbons such as ethylene. Ionomer coating and air-plasma surface pre-treatments were explored as means of hydrophilizing the carbon surface to enable adhesion of electrodeposited material. The pulsed-current electrodeposition method used successfully generated copper and copper oxide micro- and nano-particles on the prepared surfaces. Copper(I) species identified on the ionomer-treated GDEs are presumed to be highly active for the selective generation of ethylene as compared to other gaseous byproducts of CO2 reduction. Conversely, copper catalysts deposited onto plasma-treated GDEs were found to have poor activity for hydrocarbon production, likely due to substantial metallic character. Of note, plasma treatment of an ionomer-treated GDE after copper plating yielded further improvements in catalytic activity and durability towards ethylene production.

scholarly journals Pulsed Electrodeposition of Tin Electrocatalysts onto Gas Diffusion Layers for Carbon Dioxide Reduction to Formate

MRS Advances ◽  
2016 ◽  
Vol 2 (8) ◽  
pp. 451-458 ◽  
Author(s):  
Sujat Sen ◽  
Brian Skinn ◽  
Tim Hall ◽  
Maria Inman ◽  
E. Jennings Taylor ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Catalyst Particle ◽  
Gas Diffusion ◽  
Gas Diffusion Layers ◽  
Electrochemical Conversion ◽  
Diffusion Layers ◽  
Pulse Electroplating ◽  
Catalyst Particle Size ◽  
Deposition Parameters ◽  
Current Densities

ABSTRACTThis paper discusses a pulse electroplating method for developing tin (Sn)-decorated gas diffusion electrodes (GDEs) for the electrochemical conversion of carbon dioxide (CO2) to formate. The pulse-plated Sn electrodes achieved current densities up to 388 mA/cm2, more than two-fold greater than conventionally prepared electrodes (150 mA/cm2), both at a formate selectivity of 80%. Optical and microscopic analyses indicate improvements in deposition parameters could further enhance performance by reducing the catalyst particle size.

scholarly journals Effect of Gas Diffusion Layer Thickness on the Performance of Anion Exchange Membrane Fuel Cells

Processes ◽  
2021 ◽  
Vol 9 (4) ◽  
pp. 718
Author(s):  
Van Men Truong ◽  
Ngoc Bich Duong ◽  
Hsiharng Yang
Keyword(s):  
Water Management ◽  
Anion Exchange ◽  
Critical Role ◽  
Gas Diffusion ◽  
Anion Exchange Membrane ◽  
Cell Performance ◽  
Water Flooding ◽  
Diffusion Layer Thickness ◽  
Diffusion Layers ◽  
Exchange Membrane

Gas diffusion layers (GDLs) play a critical role in anion exchange membrane fuel cell (AEMFC) water management. In this work, the effect of GDL thickness on the cell performance of the AEMFC was experimentally investigated. Three GDLs with different thicknesses of 120, 260, and 310 µm (denoted as GDL-120, GDL-260, and GDL-310, respectively) were prepared and tested in a single H2/O2 AEMFC. The experimental results showed that the GDL-260 employed in both anode and cathode electrodes exhibited the best cell performance. There was a small difference in cell performance for GDL-260 and GDL-310, while water flooding was observed in the case of using GDL-120 operated at current densities greater than 1100 mA cm−2. In addition, it was found that the GDL thickness had more sensitivity to the AEMFC performance as used in the anode electrode rather than in the cathode electrode, indicating that water removal at the anode was more challenging than water supply at the cathode. The strategy of water management in the anode should be different from that in the cathode. These findings can provide a further understanding of the role of GDLs in the water management of AEMFCs.

Imaging of desaturation of the frozen gas diffusion layers by synchrotron X-ray radiography

2021 ◽  
Author(s):  
Yuzhou Zhang ◽  
Viral Hirpara ◽  
Virat Patel ◽  
Chen Li ◽  
Ryan Anderson ◽  
...  
Keyword(s):  
Gas Diffusion ◽  
Gas Diffusion Layers ◽  
X Ray ◽  
Diffusion Layers

scholarly journals Water Electrolysis Using a Porous IrO2/Ti/IrO2 Catalyst Electrode and Nafion Membranes at Elevated Temperatures

Membranes ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 330
Author(s):  
Je-Deok Kim ◽  
Akihiro Ohira
Keyword(s):  
Elevated Temperatures ◽  
High Current Density ◽  
Water Electrolysis ◽  
Gas Diffusion ◽  
Membrane Electrode ◽  
Porous Ti ◽  
Diffusion Layers ◽  
Iro2 Catalyst ◽  
Ti Powder ◽  
Catalyst Electrode

Porous IrO2/Ti/IrO2 catalyst electrodes were obtained by coating IrO2 on both sides of three types of porous Ti powder sheets (sample 1, sample 2, and sample 3) using different surface treatment methods, and a hydrogen evolution catalyst electrode was obtained by coating Pt/C on carbon gas diffusion layers. A Nafion115 membrane was used as an electrolyte for the membrane electrode assemblies (MEA). Water electrolysis was investigated at cell temperatures up to 150 °C, and the electrical characteristics of the three types of porous IrO2/Ti/IrO2 catalyst electrodes were investigated. The sheet resistance of sample 1 was higher than those of samples 2 and 3, although during water electrolysis, a high current density was observed due to the nanostructure of the IrO2 catalyst. In addition, the structural stabilities of Nafion and Aquivion membranes up to 150 °C were investigated by using small angle X-ray scattering (SAXS). The polymer structures of Nafion and Aquivion membranes were stable up to 80 °C, whereas the crystalline domains grew significantly above 120 °C. In other words, the initial polymer structure did not recover after the sample was heated above the glass transition temperature.

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