Article
Automation & Control Systems
Pengkun Jiang, Jian Chen, Lei Jin, Lalitesh Kumar
Summary: This article proposes an adaptive condition monitoring method for proton exchange membrane fuel cells based on fast electrochemical impedance spectroscopy and two-frequency impedance measurements. The method includes the development of an impedance measurement system for fast electrochemical impedance spectroscopy and impedance measurements of single frequency, the adaptive extraction of two characteristic frequencies from the impedance spectrum, and the use of a multiclass linear discriminant classifier for online state classification. The proposed method is experimentally validated on a 3-kW and a 400-W fuel cell stack, demonstrating its effectiveness, rapidity, and migrability.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2023)
Article
Chemistry, Physical
Tiancai Ma, Weikang Lin, Zhaoli Zhang, Jiajun Kang, Yanbo Yang
Summary: This study investigates the EIS behavior of a fuel cell stack under different reactant RH and current density conditions, finding that internal reactions can be distinguished by impedance spectroscopy. Low frequency impedance shows a greater variation and higher sensitivity to reactant RH, while increasing current density can lead to internal self humidification and improved fuel cell performance.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Engineering, Environmental
Hao Yuan, Haifeng Dai, Pingwen Ming, Lei Zhao, Wei Tang, Xuezhe Wei
Summary: In this paper, the transient characteristic of the proton exchange membrane (PEM) fuel cell is studied. The fixed frequency impedance is used as an assist signal for voltage response interpretation and internal mechanism analysis. The effects of different conditions on the dynamic response of the PEM fuel cell are investigated, and the transient variation of impedance under different current densities is studied. The results show that the voltage response is closely related to internal hydration state and oxygen transfer.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Physical
Quentin Meyer, Shiyang Liu, Karin Ching, Ying Da Wang, Chuan Zhao
Summary: This study introduces a new approach to monitoring the evolutions of the triple-phase boundary in proton exchange membrane fuel cells. By simultaneously capturing the ohmic resistance and double-layer capacitance using high-frequency zero-phase impedance spectroscopy, the impact of fuel cell operations on the triple-phase boundary can be accurately analyzed. The results show that the triple-phase boundary area reduces throughout the operations, indicating changes in proton transport, electron transport, and oxygen diffusion.
JOURNAL OF POWER SOURCES
(2023)
Article
Chemistry, Physical
Quentin Meyer, Chuan Zhao
Summary: Proton exchange membrane fuel cells exhibit a low-frequency inductive feature that can be accurately detected by imposing air perturbations. Controlling the amplitude and current density of the air perturbations affects the state of the low-frequency arc, with the threshold for the amplitude being crucial for its formation. This study provides insights into why the low-frequency component has not been systematically detected before and proposes a widely applicable strategy to observe the low-frequency arc.
JOURNAL OF POWER SOURCES
(2021)
Article
Chemistry, Physical
Ankit Kumar, Hsiao-Chun Su, Yong-Song Chen, Amornchai Arpornwichanop
Summary: Proton exchange membrane fuel cells utilize a proton conductive membrane to transport hydrogen protons, with the membrane's conductivity affected by water content. This study investigates the use of zeolite in the anode catalyst layer and explores the impact of various factors on the performance of the membrane electrode assembly (MEA). Results show that MEA with specific configurations exhibit optimal performance under certain operating conditions.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Green & Sustainable Science & Technology
Chengyuan Gong, Lu Xing, Cong Liang, Zhengkai Tu
Summary: The research indicates that the use of metallic bipolar plates in air-cooled low-temperature proton exchange membrane fuel cell stacks for unmanned aerial vehicles can lead to a decline in electric power output of around 4.7-6.5% as the altitude increases from 0 to 4000 meters. Maintaining the minimum air stoichiometric ratio is crucial to avoid severe stack degradation and maintain stack thermal balance.
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
Chemistry, Physical
Xingzi Yu, Caizhi Zhang, Mengxiao Li, Bin Chen, Min Fan, Xinfa Sheng, Fangping Ma
Summary: This paper analyzes the self-regulating capability of the open-cathode PEMFC stack when its cooling fan operates under different voltages. The results show that the stack achieves better self-regulation when the fan operates at 8.5V in both blow mode and suction mode. The stack can adjust activation resistance and ohmic resistance to realize self-regulating function, with the cathode activation resistance playing a dominant role.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Physical
Kai-Qi Zhu, Quan Ding, Jiang-Hai Xu, Chen Yang, Jing Zhang, Yan Zhang, Tai-Ming Huang, Zhong-Min Wan, Xiao-Dong Wang
Summary: In this study, a kW-grade air-cooled proton exchange membrane fuel cell (PEMFC) stack with a dead-end anode (DEA) operation is designed and manufactured. The stack is able to stably operate in long and short purge intervals due to the application of the gravity-assisted drainage principle. The design only requires a few small-power fans for air supply and cooling. Experimental results demonstrate superior and stable voltage output characteristics and relatively uniform temperature distributions under various operating conditions.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Physical
Lixiao Shen, Miao Ma, Zigang Zhao, Fengdi Tu, Jing Liu, Bin Xu, Yunlong Zhang, Lei Zhao, Guangjie Shao, Zhenbo Wang
Summary: The impact of carbon structure on the performance of carbon-supported catalysts has been studied under different relative humidity conditions. Low-loading solid carbon catalysts perform well at low humidity, while high-loading porous carbon catalysts excel at high humidity. Furthermore, porous carbon catalysts show high mass activity at low current density due to their reduced susceptibility to sulfonate poisoning. On the other hand, solid carbon catalysts facilitate a more uniform ionomer thin-film and create a more active three-phase interface area, resulting in satisfactory performance at high current density and low local-O2 transport resistance.
JOURNAL OF POWER SOURCES
(2023)
Article
Chemistry, Physical
Yijing Xing, Lei Liu, Zhiyong Fu, Yifan Li, Haibin Li
Summary: The study prepared membrane electrode assemblies (MEAs) that can work stably at elevated temperatures and investigated the effects of CeO2 doping on MEA performance. The CeO2-doped MEA showed optimal performance at low humidity and high temperature, and CeO2 effectively enhanced the durability of the MEA.
JOURNAL OF POWER SOURCES
(2023)
Article
Thermodynamics
Lei Zhao, Hao Yuan, Jiaping Xie, Shangfeng Jiang, Xuezhe Wei, Wei Tang, Pingwen Ming, Haifeng Dai
Summary: This paper comprehensively studies the dynamic inconsistency performance of a high-power fuel cell stack with 30 kW rated power based on impedance. The effects of various factors on in-stack dynamic inconsistency response are evaluated, and the oxygen transfer capacity is found to be the main factor influencing the local dynamic inconsistent responses. These findings provide important implications for system control and structural design optimization.
Article
Chemistry, Physical
Xianxian Yu, Huawei Chang, Xiaobing Luo, Zhengkai Tu
Summary: In this study, a compact 3 kW air-cooled fuel cell stack with metallic bipolar plates was designed. The transient behaviors of voltage and temperature of each cell were analyzed. The results showed that the heat distribution of the fuel cell was uniform, but the voltage uniformity was influenced by variations in loading current and long-term operation.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Physical
P. Jienkulsawad, K. Wiranarongkorn, Y. S. Chen, A. Arpornwichanop
Summary: This study utilizes machine learning techniques, specifically K-nearest neighbor and neural networks, to predict the suitable catalyst layer recipe in the development of a membrane electrode assembly. The results indicate that the KNN model is more appropriate for recipe prediction.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Dentistry, Oral Surgery & Medicine
Dmitry Tretiakow, Andrzej Skorek, Joanna Wysocka, Kazimierz Darowicki, Jacek Ryl
Summary: The study classified salivary gland stones into calcified, organic/lipid, and mixed types, revealing that organic components play a dominant role in the formation and development of sialolithiasis.
Article
Chemistry, Physical
Krzysztof Zakowski, Juliusz Orlikowski, Kazimierz Darowicki, Marcin Czekajlo, Piotr Iglinski, Kinga Domanska
Summary: The study examined the electrochemical properties of Al-Zn-In alloys and found that an increase in indium content led to a decrease in current capacity and corrosion resistance of the alloy, as well as a more uneven corrosion pattern on the surface.
Article
Multidisciplinary Sciences
Marziya Rizvi, Husnu Gerengi, Savas Kaya, Ilyas Uygur, Mesut Yildiz, Ibrahim Sarioglu, Zafer Cingiz, Michal Mielniczek, Brahim El Ibrahimi
Summary: Sodium nitrite shows good corrosion inhibition behavior towards pure copper in simulated cooling water, reducing metal dissolution and corrosion rate while forming a protective film. The corrosion resistance of copper increases with higher inhibitor concentrations.
SCIENTIFIC REPORTS
(2021)
Article
Electrochemistry
K. Darowicki, A. Zielinski, M. Mielniczek, E. Janicka, L. Gawel
Summary: This paper presents a polynomial description of spectrograms obtained using Dynamic Electrochemical Impedance Spectroscopy, with an alternative analysis method discussed for determining system electrochemical characteristics. This method was compared to classical analysis based on equivalent circuit fitting, showing advantages in describing impedance results and controlling electrochemical energy sources.
ELECTROCHEMISTRY COMMUNICATIONS
(2021)
Article
Energy & Fuels
Michal Mielniczek, Ewa Janicka, Lukasz Gawel, Kazimierz Darowicki
Summary: The authors used dynamic electrochemical impedance spectroscopy to study the impedance characteristics of lithium-ion capacitors at different temperatures and discussed the quality of fitting of equivalent circuits. The proposed methodology allows for a comprehensive characterization of device performance and provides key information for device optimization.
Article
Energy & Fuels
Ewa Janicka, Michal Mielniczek, Lukasz Gawel, Kazimierz Darowicki
Summary: Water management is crucial for the efficiency of proton exchange membrane fuel cells (PEMFCs). A novel approach of impedance measurements using multi-sinusoidal perturbation signals is proposed for dynamic operating conditions. Comprehensive impedance analysis showed the importance of adjusting reactant humidity based on current load levels for optimal cell operation.
Article
Energy & Fuels
Arkadiusz Szewczyk, Lukasz Gawel, Kazimierz Darowicki, Janusz Smulko
Summary: The study proposed using low-frequency (flicker) noise to evaluate the health status of proton-exchange membrane fuel cells, observing that flicker noise intensity varied significantly before impedance or output voltage changes, indicating the method's potential for monitoring cell health in industrial conditions.
Article
Chemistry, Physical
Juliusz Orlikowski, Michal Szocinski, Janusz Zygmuntowicz, Gabriel Gajewski, Wojciech Filipkowski, Kazimierz Darowicki
Summary: The study conducted metallographic and mechanical tests on an alloy operating in high temperature environments, revealing structural changes, substantial degradation, and increased hydrogen and methane content due to high-temperature corrosion. The alloy's plastic deformation range was shortened by gas penetration and carbide formation within its structure.
Article
Engineering, Chemical
Lukasz Florczak, Ginter Nawrat, Kazimierz Darowicki, Jacek Ryl, Jan Sieniawski, Malgorzata Wierzbinska, Krzysztof Raga, Andrzej Sobkowiak
Summary: Plasma electrolytic oxidation is an effective method for improving the wear and corrosion resistance of magnesium alloys. The addition of NaBF4 and NaF to the electrolyte enhances the corrosion resistance of the protective layer, with NaBF4 showing the best results.
Article
Electrochemistry
Abdul Qayoom Mugheri, Shaista Khan, Ali Asghar Sangah, Aijaz Ahmed Bhutto, Muhammad Younis Laghari, Nadeem Ahmed Mugheri, Asif Ali Jamali, Arsalan Ahmed Mugheri, Nagji Sodho, Abdul Waheed Mastoi, Aftab Kandhro
Summary: Green hydrogen has the potential to transition to a pollution-free energy infrastructure. This study proposes a solution to produce hydrogen during the photoelectrochemical process, offering greater stability and control over chemical reactions. Techno-economic assessments show the efficiency and economic feasibility of co-producing value-added chemicals to enhance green hydrogen production.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
Danpeng Cheng, Wuxin Sha, Qigao Han, Shun Tang, Jun Zhong, Jinqiao Du, Jie Tian, Yuan-Cheng Cao
Summary: LiNixCoyMn1-x-yO2 (NCM) is a critical cathode material for lithium-ion batteries in electric vehicles. The aging of cathode/electrolyte interfaces leads to capacity degradation and long-term cycle instability. A novel neural network model called ACGNet is developed to predict electrochemical stability windows of crystals, allowing for high-throughput screening of coating materials. LiPO3 is identified as a promising coating material with high oxidation voltage and low cost, which significantly improves the cycle stability of NCM batteries. This study demonstrates the accuracy and potential of machine learning in battery materials.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
P. Mohana, R. Yuvakkumar, G. Ravi, S. Arunmetha
Summary: This study successfully fabricates a non-noble CuO/NiO/rGO nanocomposite and investigates its electrocatalytic performance for oxygen evolution reaction in alkaline environment. The experimental results demonstrate that the electrocatalyst exhibits high activity and good stability, offering a new synthetic approach for sustainable energy production.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
Qiong Qu, Jing Guo, Hongyu Wang, Kai Zhang, Jingde Li
Summary: In this study, a bifunctional electrode host design consisting of carbon nanofibers implanted ordered porous Co-decorated Al2O3 supported on carbon nanotube film (CNTF) was proposed to address the shuttling effect of lithium polysulfides (LiPSs) and dendrite formation of metal lithium anode in lithium-sulfur (Li-S) batteries. The electrode exhibited excellent conductivity, efficient confinement of LiPSs, and catalytic conversion performance, resulting in high initial capacity and good capacity retention during cycling. As an anode, the electrode showed excellent Li+ diffusion performance and uniform lithium growth behavior, achieving a dendrite-free lithium electrode. The flexible pack cell assembled from these electrodes delivered a specific capacity of 972 mAh g(-1) with good capacity retention.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
Hong Zhang, Jin-Peng Yu, Chen Chen, Cheng-Yong Shu, Guang-Yu Xu, Jie Ren, Kai Cui, Wen-Fang Cai, Yun-Hai Wang, Kun Guo
Summary: Spray coating of acetylene black nanoparticles onto stainless steel mesh can enhance its biofilm formation ability and current density, making it a promising electrode material for microbial electrochemical systems. The spray coating method is simple, cost-effective, and suitable for large-size stainless steel electrodes.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
Binpeng Hou, Jingjin Chen, Li-Hong Zhang, Xiaowen Shi, Zizhong Zhu
Summary: The electrochemical performance of Li1.20Mn0.44Ni0.32Co0.04O2 and its oxygen-deficient phase Li1.20Mn0.44Ni0.32Co0.04O1.83 was studied through first-principles calculations. The results show that the oxygen-deficient phase has a higher theoretical capacity but lower voltage platform and higher chemical activity compared to the pristine phase.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
Yating Du, Sayoko Shironita, Daisuke Asakura, Eiji Hosono, Yoshitsugu Sone, Yugo Miseki, Eiichi Kobayashi, Minoru Umeda
Summary: This study investigates the effect of high- and low-temperature environments on the charge-discharge performance of a Li-ion battery. The deterioration mechanisms of the battery at different temperatures are analyzed through various characterization techniques. The results indicate that the battery performance deteriorates more significantly at a low-temperature environment of 5 degrees C compared to higher temperatures. The understanding of the deterioration mechanisms can contribute to the development of safer battery usage methods.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
Si-Si Shi, Zhi-Xiang Yuan, Fei Zhang, Ping Chen
Summary: In this study, a new nano-electrocatalyst was prepared, which exhibited superior electrocatalytic activity for the reduction of NO2- to ammonia in a neutral electrolyte, potentially due to the synergistic enhancement between Co3O4-x and Co.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
Berna Dalkiran, Havva Bekirog
Summary: This study reports the use of deep eutectic solvents (DES) based on ethylene glycol and urea as low-cost and green electrolytes for enhancing electrochemical detection of natural antioxidants. The study successfully developed a disposable and effective electrochemical sensing platform for simultaneous determination of ascorbic acid (AA) and gallic acid (GA) using NaOH nanorods on a pencil graphite electrode. The proposed electrode showed improved analytical performance, with higher peak currents and shifted oxidation potentials in DES compared to BR buffer medium.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
Sijun Ren, Jianguo Huang
Summary: In this study, a novel bio-inspired nanofibrous WO3/carbon composite was synthesized using a facile hydrothermal method. The three-dimensional network structure of the composite alleviated the volume expansion of WO3 nanorods and enhanced the charge-transport kinetics. The optimized composite exhibited superior lithium storage properties.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
Zhilong Zheng, Yu Chen, Hongxia Yin, Hengbo Xiao, Xiangji Zhou, Zhiwen Li, Ximin Li, Jin Chen, Songliu Yuan, Junjie Guo, Haibin Yu, Zhen Zhang, Lihua Qian
Summary: This study found that interstitial Zn cations in CoMoO4 can modulate the dissolution kinetics of Mo cations and improve the OER performance. The interstitial Zn cations can prevent the dissolution of Co cations at high potential, enhancing the durability of the catalyst.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
Xiaobo Lin, Shern R. Tee, Debra J. Searles, Peter T. Cummings
Summary: Molecular dynamics simulations using the constant potential method were used to investigate the charging dynamics and charge storage of supercapacitors. The simulations revealed that the water-in-salt electrolyte exhibited the highest charge storage and significantly higher capacitance on the negative electrode. The varying contributions of different electrode regions to supercapacitor performance were also demonstrated.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
Wiktoria Lipinska, Vita Saska, Katarzyna Siuzdak, Jakub Karczewski, Karol Zaleski, Emerson Coy, Anne de Poulpiquet, Ievgen Mazurenko, Elisabeth Lojou
Summary: The spatial distribution of enzymes on electrodes is important for bioelectrocatalysis. In this study, controlled spatial distribution of gold nanoparticles on Ti nanodimples was achieved. The efficiency of enzymatic O2 reduction was found to be influenced by the size of the gold nanoparticles and their colocalization with TiO2. The highest stability of enzymatic current was observed with the largest gold nanoparticles.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
Tariq M. Al-Hejri, Zeenat A. Shaikh, Ahmed H. Al-Naggar, Siddheshwar D. Raut, Tabassum Siddiqui, Hamdan M. Danamah, Vijaykumar V. Jadhav, Abdullah M. Al-Enizi, Rajaram S. Mane
Summary: This study explores a promising self-growth approach for the synthesis of nickel hydroxide (Ni(OH)2) nanosponge-balls on the surface of a nickel-foam (NiF) electrode. The modified NiF electrode, named Ni(OH)2@NiF, shows distinctive nanosponge-ball morphology and demonstrates excellent energy storage capability and electrocatalytic performance in both hydrogen and oxygen evolution reactions.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
Rafael Del Olmo, Gregorio Guzman-Gonzalez, Oihane Sanz, Maria Forsyth, Nerea Casado
Summary: The use of Lithium-Ion Batteries (LIBs) is becoming increasingly extensive, and it is important to optimize the devices to achieve their maximum practical specific capacity. In this study, mixed ionic-electronic conducting (MIEC) binders based on PEDOT:PSS and PEDOT: PDADMA-TFSI were developed for Li-ion cathodes, and their performance was compared with conventional formulations. The influence of electrode formulations, including the addition of conducting carbon and an Organic Ionic Plastic Cristal (OIPC), was also analyzed. The proposed binders showed improved performance compared to conventional formulations with different electrolyte types and active materials.
ELECTROCHIMICA ACTA
(2024)