Article
Chemistry, Physical
L. Padilla Urbina, J. Liu, N. Semagina, M. Secanell
Summary: Inkjet printing is a feasible technique for the fabrication of electrode in unitized regenerative fuel cells (URFCs) and the study of optimal ionomer and catalyst loading. A physical mixture of Pt, IrOx, and Nafion ionomer was directly inkjet printed on a Nafion membrane to create bifunctional oxygen electrodes with varying loading for a URFC. The results show that the optimal electrode requires low ionomer loading and significantly less IrOx catalyst than platinum.
JOURNAL OF POWER SOURCES
(2023)
Review
Chemistry, Physical
Shiyi Wang, Adam Z. Weber, Xiong Peng
Summary: This review highlights recent progress on high-performing PEM-URFCs, focusing on electrode engineering, key components, and operating approaches that consider realistic conditions. The study also discusses key components of a membrane electrode assembly (MEA), including the catalyst layer, diffusion media, and membrane, which require different optimization strategies.
CURRENT OPINION IN ELECTROCHEMISTRY
(2023)
Article
Chemistry, Physical
Noor ul Hassan, Prabhu Ganesan, Aaron A. Lando, William E. Mustain, Hector R. Colon-Mercado
Summary: Anion exchange membrane unitized regenerative fuel cells (AEM-URFCs) are a promising technology for energy storage and electricity production, but their efficiency is limited by the kinetics of the bifunctional oxygen electrode. This study advances the efficiency of the oxygen electrode by using new electrocatalysts, achieving high round trip efficiency and the highest performance reported to date in AEM-URFCs.
JOURNAL OF POWER SOURCES
(2022)
Article
Chemistry, Physical
Cheoulwoo Oh, Man Ho Han, Young-Jin Ko, Jun Sik Cho, Min Wook Pin, Peter Strasser, Jae-Young Choi, Hansung Kim, Chang Hyuck Choi, Woong Hee Lee, Hyung-Suk Oh
Summary: This study synthesized a Pt-Ni alloy catalyst to improve the durability of anion exchange membrane-based unitized regenerative fuel cells (AEM-URFCs) and revealed the underlying mechanism.
ADVANCED ENERGY MATERIALS
(2023)
Review
Environmental Studies
Teresa Maria Gulotta, Roberta Salomone, Francesco Lanuzza, Giuseppe Saija, Giovanni Mondello, Giuseppe Ioppolo
Summary: Unitized Regenerative Fuel Cell (URFC) is a promising green hydrogen technology for clean energy production, but further research is needed to make it more attractive across various sectors. The analysis of Life Cycle Assessment (LCA) and Life Cycle Costing (LCC) studies on URFCs using proton exchange membrane (PEM) devices reveals varying environmental and economic impacts, highlighting the need for increased transparency and harmonization in these assessments.
ENVIRONMENTAL IMPACT ASSESSMENT REVIEW
(2022)
Article
Multidisciplinary Sciences
Ahyoun Lim, Hui-Yun Jeong, Youngjoon Lim, Jin Young Kim, Hee Young Park, Jong Hyun Jang, Yung-Eun Sung, Jong Min Kim, Hyun S. Park
Summary: This study presents a high-performance amphiphilic Ti PTL suitable for PEM-URFCs, with alternating hydrophobic and hydrophilic channels to achieve excellent performance in both FC and EC modes by changing the surface polarity. The results demonstrate a significant improvement in performance in both FC and EC modes with the amphiphilic PTL.
Article
Chemistry, Physical
Ahyoun Lim, Ju Sung Lee, Suji Lee, So Young Lee, Hyoung-juhn Kim, Sung Jong Yoo, Jong Hyun Jang, Yung-Eun Sung, Hyun S. Park
Summary: In this study, the water flux of the anode and cathode electrodes is systematically controlled by manipulating the relative humidity of the supplied gas and altering the selection of the electrode in amphiphilic membrane electrode assembly. By investigating the operation factors of URFC, a high round trip efficiency of 51 % (@ 0.4 A cm(-2)) was achieved with only 0.65 mg((Pt+Ir)) cm(-2) of the noble catalyst.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2021)
Article
Electrochemistry
Md. Masud Rana, Palanisamy Rajkumar, Beom-Soo Kang, Gyungse Park, Ho-Jung Sun, So Yeon Kim, Hong-Ki Lee, Joongpyo Shim
Summary: In this study, the effect of different membrane treatment processes on the performance of anion exchange membrane-unitized regenerative fuel cells (AEM-URFCs) was investigated. By replacing bromide ions (Br-) with hydroxyl ions (OH-), cell performance was greatly enhanced. The concentration of OH- ions in the KOH solution had a significant impact on Br- ion replacement. The MEA treated with 1.0 M KOH in a mixture of isopropyl alcohol (IPA) and deionized water (H2O) (25/75 vol%) exhibited the lowest Br- ion content and highest current densities in both fuel cell and water electrolyzer modes.
JOURNAL OF APPLIED ELECTROCHEMISTRY
(2023)
Review
Materials Science, Multidisciplinary
Yu Seung Kim
Summary: As fuel cells and electrolyzers demand higher performance and durability, the design of polymer electrolytes is evolving with a focus on increasing ionic concentration. This review highlights recent advancements in the use of high ionic concentration polymer electrolytes in electrochemical devices, summarizing synthetic approaches, performance benefits, challenges, and prospects. The goal is to explain the working principles of these electrolytes in high-performing fuel cells and electrolyzers, while also generating interest in utilizing these materials in tackling tough scientific challenges in emerging fields.
ACS APPLIED POLYMER MATERIALS
(2021)
Article
Green & Sustainable Science & Technology
Hang Guo, Jia Song, Fang Ye, M. A. Chong Fang
Summary: The oxygen side flow channel structures have a significant influence on the dynamic response of relevant parameters during the operation mode switching procedures of a unitized regenerative fuel cell. The study compared the influence of eight oxygen-side channels on the mode switching process and found that the required time for parameters to reach a stable state in the fuel cell mode is longer when using orientational flow channels. Additionally, different flow channel structures affect the time required to stabilize each parameter during mode switching, but do not change the characteristics of the stable state mode.
Article
Chemistry, Physical
Shaolan Mo, Chun Jin, Feng Wang, Chen Wen, Nan Wang, Lei Feng, Jingying Bai, Jingjun Liu
Summary: The study developed bifunctional oxygen catalysts with double active sites, showing higher activity and stability compared to commercial catalysts. The strong particle-to-particle interaction between PtCoW and neighboring Ir, along with the formed IrO2 parallel to Ir epitaxial structure, were the main reasons for the enhanced performance.
ACS APPLIED ENERGY MATERIALS
(2021)
Review
Chemistry, Analytical
Dusan Mladenovic, Ana Mladenovic, Diogo M. F. Santos, Ayse B. Yurtcan, Scepan Miljanic, Slavko Mentus, Biljana Sljukic
Summary: Among various alternatives, hydrogen energy and its use in regenerative fuel cells is a promising option. However, the development of suitable and efficient electrocatalysts poses challenges due to the high cost and limited availability of platinum-group metals. In this review, the focus is on the recent advances in bifunctional catalysts based on transition metal oxides (TMOs) for oxygen reduction and evolution in alkaline media. The review highlights the need for unified parameters to compare the effectiveness of different electrocatalysts and discusses the promising alternatives by comparing the performance of TMOs with precious metal catalysts.
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2023)
Article
Materials Science, Multidisciplinary
In -Ho Kim, Dae-Kwang Lim, Yeon Namgung, Hohan Bae, Jun-Young Park, Sun-Ju Song
Summary: In this study, the electrochemical and transport properties of a perovskite-type proton conductor BZCYYb5311 were evaluated. The material showed high proton conductivity and exceptional chemical stability. It exhibited a proton conductivity of 98% compared to ionic conductivity at 600°C. The maximum power density in fuel cell mode and current density in electrolysis mode were calculated, indicating the potential of BZCYYb5311 as a fuel cell material.
Article
Environmental Sciences
Asif Jamil, Sikander Rafiq, Tanveer Iqbal, Hafiza Aroosa Aslam Khan, Haris Mahmood Khan, Babar Azeem, M. Z. Mustafa, Abdulkader S. Hanbazazah
Summary: Fuel cells are environmentally friendly technology with high efficiency and economic advantages. Proton exchange membranes, especially for hydrogen fuel cells, have great potential but face challenges in terms of cost and degradation of proton exchange capacity over time.
Article
Thermodynamics
Ping'an Li, Diankai Qiu, Linfa Peng, Shuiyun Shen, Xinmin Lai
Summary: In this study, an experimental measurement protocol for the degradation of Unitized Regenerative Fuel Cell (URFC) was established, confirming that the degradation mainly occurs in the water electrolysis mode. Carbon corrosion on the MPL side of the GDL was found to be the main cause of URFC degradation, leading to a reduction in water transport capacity and an increase in CCM proton conduction resistance.
ENERGY CONVERSION AND MANAGEMENT
(2022)
Article
Chemistry, Physical
Artem S. Pushkarev, Maksim A. Solovyev, Sergey A. Grigoriev, Irina Pushkareva, Yan Z. Voloshin, Nina Chornenka, Alexander S. Belov, Pierre Millet, Valery N. Kalinichenko, Alexey G. Dedov
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2020)
Article
Green & Sustainable Science & Technology
Y. Sanath K. De Silva, Peter Hugh Middleton, Mohan Lal Kolhe
Correction
Chemistry, Physical
Long Yang, Guoqiang Li, Jifang Chang, Junjie Ge, Changpeng Liu, Vladimir Fateev, Guiling Wang, Zhao Jin, Wei Xing
APPLIED CATALYSIS B-ENVIRONMENTAL
(2020)
Review
Electrochemistry
Tatiana L. Kulova, Vladimir N. Fateev, Ekaterina A. Seregina, Alexander S. Grigoriev
INTERNATIONAL JOURNAL OF ELECTROCHEMICAL SCIENCE
(2020)
Article
Chemistry, Physical
Nataliya A. Ivanova, Dmitry D. Spasov, Sergey A. Grigoriev, Roman A. Kamyshinsky, Georgy S. Peters, Ruslan M. Mensharapov, Ekaterina A. Seregina, Pierre Millet, Vladimir N. Fateev
Summary: The study found that freeze-thaw cycles from ambient down to -80 degrees C have an impact on the properties of PFSA membranes and the performance of MEAs. The addition of methanol vapor to the hydrogen showed beneficial effects, increasing the ionic resistivity of the membranes but having a protective effect on the catalytic layers. Optimal methanol addition reduced the degradation rate of the catalytic layer by almost half.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Physical
Nataliya A. Ivanova, Dmitry D. Spasov, Adelina A. Zasypkina, Olga K. Alekseeva, Elena Kukueva, Ekaterina A. Vorobyeva, Ekaterina S. Kudinova, Ratibor G. Chumakov, Pierre Millet, Sergey A. Grigoriev
Summary: This study compared the performance level of H-2/O-2 PEM fuel cells using three different deposition techniques for catalytic layers, and analyzed their microstructure and chemical composition using various analytical methods. The electrochemical surface areas of the catalytic layers were determined by cyclic voltammetry, and their performance was compared based on i-V curves.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Physical
Irina Pushkareva, Artem S. Pushkarev, Valery N. Kalinichenko, Ratibor G. Chumakov, Maksim A. Soloviev, Yanyu Liang, Pierre Millet, Sergey A. Grigoriev
Summary: The Pt/RGO catalyst synthesized through optimized simultaneous reduction process shows higher Pt utilization, better performance stability, and significantly increases fuel cell power density. The advantages of Pt/RGO over Pt/C include high electrical conductivity, larger specific surface area provided by RGO, and reduced percolation limit of electrocatalytic layer components due to high aspect ratio of RGO.
Article
Electrochemistry
A. A. Kalinnikov, S. A. Grigoriev, D. G. Bessarabov, K. Bouzek
Summary: This study utilizes mathematical simulations to investigate various gas-liquid flow regimes in porous transport layers/current collectors and their impact on the performance of a model electrolysis cell based on a polymer electrolyte membrane (PEM). Optimal operational parameters for electrolysis cell components were determined, and conditions causing critical modes of mass transport were identified. The numerical analysis results are discussed in terms of component selection and electrical characteristics for the PEM-based electrolysis cell.
ELECTROCHIMICA ACTA
(2021)
Editorial Material
Chemistry, Physical
Sergey A. Grigoriev
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Physical
D. O. Skanchenko, E. Altynbaev, N. Martin, D. A. Salamatin, R. A. Sadykov, A. Tsvyaschenko, S. Grigoriev
Summary: The helical magnetic structure of the Mn0.9Fe0.1Ge compound was investigated under high pressure, showing an increase in stability and critical magnetic fields values with pressure increase. The magnetic ordering temperature decreases with pressure increase.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Electrochemistry
A. S. Pushkarev, I. Pushkareva, M. A. Solovyev, M. Prokop, T. Bystron, S. K. Rajagopalan, K. Bouzek, S. A. Grigoriev
Summary: The impact of sintered Ti porous transport layer (PTL) structures on both the cathode and anode of the PEM water electrolysis cell needs further investigation. It was found in the study that using a less porous anode PTL significantly increases mass transfer losses, while using a less porous cathode PTL can mitigate these losses.
ELECTROCHIMICA ACTA
(2021)
Article
Chemistry, Physical
Ruslan M. Mensharapov, Nataliya A. Ivanova, Dmitry D. Spasov, Elena V. Kukueva, Adelina A. Zasypkina, Ekaterina A. Seregina, Sergey A. Grigoriev, Vladimir N. Fateev
Summary: Pt/C and Pt/x-SnO2/C catalysts were synthesized using a polyol method and their kinetic properties towards oxygen reduction reaction were studied by a rotating disk electrode technique in a temperature range from 1 to 50 degrees C. The addition of x-SnO2 did not reduce the catalyst activity in the temperature range of 1-30 degrees C, but a rise in temperature up to 50 degrees C resulted in a composite catalyst activity reduction of about 30%.
Article
Chemistry, Physical
Ruslan M. Mensharapov, Nataliya A. Ivanova, Adelina A. Zasypkina, Dmitry D. Spasov, Matvey Sinyakov, Sergey A. Grigoriev, Vladimir N. Fateev
Summary: In this study, a semi-empirical model is proposed to evaluate the impact of carbon nanotube-based support materials on the size distribution of platinum nanoparticles. The electrochemically active surface area of the electrocatalyst is calculated based on the obtained distribution, and used to evaluate the performance of the catalytic layer.
Article
Materials Science, Multidisciplinary
Margarita Kozlova, Sergey Butrim, Maksim Solovyev, Artem Pushkarev, Irina Pushkareva, Valery Kalinichenko, Svetlana Akelkina, Sergey Grigoriev
Summary: This study investigated the structural and electrochemical characteristics of platinum electrocatalysts supported on reduced graphene oxide (rGO), including those modified with amine functionalities, nitrogen heteroatoms (rGO-Am), and oxygen enriched (rGO-O). The Pt-20/rGO-Am showed a lower Pt nanoparticles size together with high Pt utilization and EASA values compared to rGO-supported catalysts and the Pt/C reference sample due to the uniform distribution of nucleation centers on the surface of graphene nanoparticles and the greater ability of these centers to electrically bond with platinum.
C-JOURNAL OF CARBON RESEARCH
(2022)
Article
Chemistry, Multidisciplinary
Artem S. Pushkarev, Irina V. Pushkareva, Maksim A. Solovyev, Sergey A. Grigoriev, Yan Z. Voloshin, Nina V. Chornenka, Alexander S. Belov, Pierre Millet, Manuel Antuch, Valery N. Kalinichenko, Alexey G. Dedov
Summary: By employing a series of iron(II) clathrochelates with various terminal phenanthrenyl groups, hydrogen-evolving cathodes were prepared and used in place of platinum in polymer electrolyte membrane water electrolysis cells. The in situ electrochemical activation of the cathodes resulted in promising performance and durability, making them a potential alternative to platinum as hydrogen-evolving cathode electrocatalysts.
MENDELEEV COMMUNICATIONS
(2021)
