Defects tailoring IrO2@TiN1+x nano-heterojunction for superior water oxidation activity and stability

2021 ◽  
Author(s):  
Sen Wang ◽  
Hong Lv ◽  
Songhu Bi ◽  
Tianqi Li ◽  
Yongwen Sun ◽  
...  
Keyword(s):  
Water Oxidation ◽  
Proton Exchange Membrane ◽  
Water Electrolysis ◽  
Cost Effective ◽  
Proton Exchange ◽  
Pragmatic Approach ◽  
Oxidation Activity ◽  
Anode Catalysts ◽  
Exchange Membrane

Developing cost-effective Ir-based anode catalysts for proton exchange membrane (PEM) water electrolysis has been recognized as an efficient and pragmatic approach, however, many challenges remain to lower Ir content while...

scholarly journals Electrochemical characterization of manganese oxides as a water oxidation catalyst in proton exchange membrane electrolysers

2019 ◽  
Vol 6 (5) ◽  
pp. 190122 ◽  
Author(s):  
Toru Hayashi ◽  
Nadège Bonnet-Mercier ◽  
Akira Yamaguchi ◽  
Kazumasa Suetsugu ◽  
Ryuhei Nakamura
Keyword(s):  
Water Oxidation ◽  
Manganese Oxides ◽  
Proton Exchange Membrane ◽  
Water Electrolysis ◽  
Electrode System ◽  
Proton Exchange ◽  
Oxidation Catalyst ◽  
Carbon Supports ◽  
Exchange Membrane ◽  
Mn Oxides

The performance of four polymorphs of manganese (Mn) dioxides as the catalyst for the oxygen evolution reaction (OER) in proton exchange membrane (PEM) electrolysers was examined. The comparison of the activity between Mn oxides/carbon (Mn/C), iridium oxide/carbon (Ir/C) and platinum/carbon (Pt/C) under the same condition in PEM electrolysers showed that the γ-MnO 2 /C exhibited a voltage efficiency for water electrolysis comparable to the case with Pt/C, while lower than the case with the benchmark Ir/C OER catalyst. The rapid decrease in the voltage efficiency was observed for a PEM electrolyser with the Mn/C, as indicated by the voltage shift from 1.7 to 1.9 V under the galvanostatic condition. The rapid deactivation was also observed when Pt/C was used, indicating that the instability of PEM electrolysis with Mn/C is probably due to the oxidative decomposition of carbon supports. The OER activity of the four types of Mn oxides was also evaluated at acidic pH in a three-electrode system. It was found that the OER activity trends of the Mn oxides evaluated in an acidic aqueous electrolyte were distinct from those in PEM electrolysers, demonstrating the importance of the evaluation of OER catalysts in a real device condition for future development of noble-metal-free PEM electrolysers.

High performance and cost-effective supported IrOx catalyst for proton exchange membrane water electrolysis

2021 ◽  
Vol 385 ◽  
pp. 138391
Author(s):  
Xiangping Min ◽  
Yan Shi ◽  
Zhuoxin Lu ◽  
Lisha Shen ◽  
Taiwo Oladapo Ogundipe ◽  
...  
Keyword(s):  
High Performance ◽  
Proton Exchange Membrane ◽  
Water Electrolysis ◽  
Cost Effective ◽  
Proton Exchange ◽  
Exchange Membrane

scholarly journals Effect of Stratification of Cathode Catalyst Layers on Durability of Proton Exchange Membrane Fuel Cells

Energies ◽  
2021 ◽  
Vol 14 (10) ◽  
pp. 2975
Author(s):  
Zikhona Nondudule ◽  
Jessica Chamier ◽  
Mahabubur Chowdhury
Keyword(s):  
Fuel Cells ◽  
Proton Exchange Membrane ◽  
Electrochemical Impedance ◽  
Catalyst Layer ◽  
Cost Effective ◽  
Proton Exchange ◽  
Membrane Electrode ◽  
Potential Cycling ◽  
Catalyst Layers ◽  
Exchange Membrane

To decrease the cost of fuel cell manufacturing, the amount of platinum (Pt) in the catalyst layer needs to be reduced. In this study, ionomer gradient membrane electrode assemblies (MEAs) were designed to reduce Pt loading without sacrificing performance and lifetime. A two-layer stratification of the cathode was achieved with varying ratios of 28 wt. % ionomer in the inner layer, on the membrane, and 24 wt. % on the outer layer, coated onto the inner layer. To study the MEA performance, the electrochemical surface area (ECSA), polarization curves, and electrochemical impedance spectroscopy (EIS) responses were evaluated under 20, 60, and 100% relative humidity (RH). The stratified MEA Pt loading was reduced by 12% while maintaining commercial equivalent performance. The optimal two-layer design was achieved when the Pt loading ratio between the layers was 1:6 (inner:outer layer). This MEA showed the highest ECSA and performance at 0.65 V with reduced mass transport losses. The integrity of stratified MEAs with lower Pt loading was evaluated with potential cycling and proved more durable than the monolayer MEA equivalent. The higher ionomer loading adjacent to the membrane and the bi-layer interface of the stratified catalyst layer (CL) increased moisture in the cathode CL, decreasing the degradation rate. Using ionomer stratification to decrease the Pt loading in an MEA yielded a better performance compared to the monolayer MEA design. This study, therefore, contributes to the development of more durable, cost-effective MEAs for low-temperature proton exchange membrane fuel cells.

scholarly journals On the Effect of Anion Exchange Ionomer Binders in Bipolar Electrode Membrane Interface Water Electrolysis

2021 ◽  
Author(s):  
Britta Mayerhöfer ◽  
Konrad Ehelebe ◽  
Florian Dominik Speck ◽  
Markus Bierling ◽  
Johannes Bender ◽  
...  
Keyword(s):  
Proton Exchange Membrane ◽  
Water Electrolysis ◽  
Membrane Electrode Assembly ◽  
Proton Exchange ◽  
Membrane Electrode ◽  
Bipolar Electrode ◽  
Electrode Interface ◽  
Exchange Membrane ◽  
Electrode Membrane ◽  
Pem Water Electrolyzer

Bipolar membrane|electrode interface water electrolyzers (BPEMWE) were found to outperform a proton exchange membrane (PEM) water electrolyzer reference in a similar membrane electrode assembly (MEA) design based on individual porous...

Proton exchange membrane fuel cells powered with both CO and H2

2021 ◽  
Vol 118 (43) ◽  
pp. e2107332118
Author(s):  
Xian Wang ◽  
Yang Li ◽  
Ying Wang ◽  
Hao Zhang ◽  
Zhao Jin ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Peak Power ◽  
Proton Exchange Membrane ◽  
Proton Exchange ◽  
Single Atom ◽  
Anode Catalysts ◽  
Co Electrooxidation ◽  
Co Activation ◽  
Maximum Current ◽  
Exchange Membrane

The CO electrooxidation is long considered invincible in the proton exchange membrane fuel cell (PEMFC), where even a trace level of CO in H2 seriously poisons the anode catalysts and leads to huge performance decay. Here, we describe a class of atomically dispersed IrRu-N-C anode catalysts capable of oxidizing CO, H2, or a combination of the two. With a small amount of metal (24 μgmetal⋅cm−2) used in the anode, the H2 fuel cell performs its peak power density at 1.43 W⋅cm−2. When operating with pure CO, this catalyst exhibits its maximum current density at 800 mA⋅cm−2, while the Pt/C-based cell ceases to work. We attribute this exceptional catalytic behavior to the interplay between Ir and Ru single-atom centers, where the two sites act in synergy to favorably decompose H2O and to further facilitate CO activation. These findings open up an avenue to conquer the formidable poisoning issue of PEMFCs.

Modified Sliding Mode-Based Control of a Three-Level Interleaved DC-DC Buck Converter for Proton Exchange Membrane Water Electrolysis

2021 ◽  
Author(s):  
Burin Yodwong ◽  
Damien Guilbert ◽  
Wattana Kaewmanee ◽  
Matheepot Phattanasak ◽  
Melika Hinaje ◽  
...  
Keyword(s):  
Proton Exchange Membrane ◽  
Sliding Mode ◽  
Water Electrolysis ◽  
Buck Converter ◽  
Proton Exchange ◽  
Exchange Membrane

Proton Exchange Membrane Water Electrolysis Modeling for System Simulation and Degradation Analysis

2018 ◽  
Vol 90 (10) ◽  
pp. 1437-1442 ◽  
Author(s):  
Sönke Gößling ◽  
Sebastian Stypka ◽  
Matthias Bahr ◽  
Bernd Oberschachtsiek ◽  
Angelika Heinzel
Keyword(s):  
Proton Exchange Membrane ◽  
System Simulation ◽  
Water Electrolysis ◽  
Proton Exchange ◽  
Degradation Analysis ◽  
Exchange Membrane
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