Article
Electrochemistry
Yubo Zhang, Jason D. Nicholas
Summary: Research has shown that Solid Oxide Fuel Cells (SOFCs) using high performance nano-composite cathodes on commercial supports exhibit similar current-voltage behavior and even peak power density improvement compared to those using commercial cathodes. This suggests that state-of-the-art SOFC performance may be limited by cathode, anode, or ohmic losses within the cell.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2021)
Article
Chemistry, Physical
Huilin Zhang, Ting Chen, Zuzhi Huang, Guangzhou Hu, Juan Zhou, Shaorong Wang
Summary: A cathode-supported SOFC with improved electrochemical performance was successfully fabricated in this study, and the mechanism of electrochemical reaction was investigated using the DRT method. The results showed that the impregnated LSC particles increased the triple phase-boundaries and improved the oxygen reduction reaction rate.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Physical
T. Ghorbani-Moghadam, A. Kompany, M. Golmohammad
Summary: The effect of Ni substitution in Co sites of La0.7Sr1.3CoO4 Ruddlesden-Popper oxides was investigated as a cathode for solid oxide fuel cells. Structural and lattice dynamic analyses showed that La0.7Sr1.3Co1-xNixO4 had a tetragonal structure and the lattice volume decreased with Ni substitution due to stabilization of Co3+ in low spin state. X-ray photoelectron spectroscopy indicated a decrease in the Co4+/Co3+ ratio and an increase in oxygen vacancy and adsorption with enhanced Ni dopant. Electrochemical impedance analysis revealed that doping La0.7Sr1.3CoO4 with Ni resulted in a significant decrease in polarization area specific resistance, making these compounds suitable cathode candidates for IT-SOFC.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Nanoscience & Nanotechnology
Muhammad Zubair Khan, Muhammad Taqi Mehran, Amjad Hussain, Seung-Bok Lee, Tak-Hyoung Lim, Rak-Hyun Song
Summary: This study aims to predict the degradation in the performance of a solid oxide fuel cell cathode due to cation interdiffusion and surface segregation. The study evaluates cation migration in the composite cathode using scanning transmission electron microscopy-energy-dispersive X-ray spectroscopy. The resulting insulating phase formed within the cathode is quantified and the corresponding performance degradation is predicted. Mathematical relationships are established for the estimation of degradation due to surface segregation. The study provides a systematic understanding of the time-dependent cation migration and segregation behavior.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Physical
Di Yang, Gang Chen, Hailiang Liu, Linlin Zhang, Yang He, Xuebai Zhang, Kai Yu, Shujiang Geng, Ying Li
Summary: The study found that the NCAL cathode has better electrochemical performance at 550 degrees C, especially when used in a composite with GDC with a mass ratio of 8/2. High temperature sintering can decrease the performance of the composite cathode, while the high oxygen vacancy concentration at the NCAL-Li2CO3/GDC interfaces enhances oxygen ion conductivity and lowers the activation energy for reactions.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Nanoscience & Nanotechnology
Yunjie Gou, Guangdong Li, Rongzheng Ren, Chunming Xu, Jinshuo Qiao, Wang Sun, Kening Sun, Zhenhua Wang
Summary: This study demonstrates an effective optimized strategy for designing high-performance cathodes by doping Pr into BaFeO3-delta perovskites, enhancing electrochemical activity and CO2 resistance. The appropriate content of Pr substitution increases the oxygen vacancy concentration, promotes reactions on the oxygen electrode, and shows excellent electrochemical performance.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Physical
Jihao Zhang, Huding Guo, Libin Lei, Shuanglin Shen, Keqing Zheng, Minfang Han
Summary: A practical segmented cell measurement method is developed to detect fuel starvation in solid oxide fuel cells (SOFCs) at local regions. By segmenting the cathode and only measuring the voltage signal, the local current-voltage (I-V) curve per segment is determined. The area specific resistance (ASR) is calculated and compared among segments to validate the data reliability. Fuel starvation is estimated using the rapid voltage drop in I-V curves and the rapid ASR increment in I-ASR curves, with the ASR increment being a more sensitive criterion.
JOURNAL OF POWER SOURCES
(2023)
Article
Chemistry, Physical
Hyunmin Kim, Chaesung Lim, Ohhun Kwon, Sihyuk Choi, Jeong Woo Han, Guntae Kim
Summary: Cobalt-free ferrites are gaining attention as potential cathode materials for solid oxide fuel cells due to their structural stability and compatibility with electrolytes. However, their activity for the oxygen reduction reaction is lower compared to cobalt-based cathodes. Isovalent doping with Sr2+ is found to significantly enhance the oxygen reduction reaction activity in Pr0.5Ba0.5-ySryFeO3-delta ferrites. The substitution of Ba2+ with Sr2+ reduces the thermal expansion coefficient and improves the electrical conductivity and resistance.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Chemistry, Physical
Ben Ma, Zhaohui Chen, Zhuang Lin, Lin Cheng, Yingke Zhou
Summary: This study investigates the effects of Mg doping on the performance of Mn-Cr spinel oxide cathodes in solid oxide fuel cells (SOFCs). Both experimental results and density functional theory (DFT) calculations show that Mg doping can optimize the electronic structure of the spinel oxide, increase the oxygen vacancy concentration, and improve the electrical conductivity and catalytic activity. The Mg-doped Mn-Cr spinel oxide cathode exhibits superior performance with high area-specific polarization resistance and maximum power density.
JOURNAL OF POWER SOURCES
(2023)
Article
Materials Science, Ceramics
Jinghe Bai, Defeng Zhou, Xiaofei Zhu, Ning Wang, Qingwen Liang, Ruyi Chen, Hongyan Lu, Jinmeng Li, Wenfu Yan
Summary: In this paper, the ORR activity of the Co-free SOFC cathode material is effectively increased by doping low-valence Ln(3+) ions at the B-site of Fe-based perovskite BSF. The doped BSFN shows improved oxygen exchange and diffusion rate, resulting in lower resistance and higher power density compared to BSF. The BSFN-based single cell also exhibits better long-term stability due to its lower thermal expansion coefficient.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Physical
Hafiz Ahmad Ishfaq, Muhammad Zubair Khan, Muhammad Taqi Mehran, Rizwan Raza, Waqas Hassan Tanveer, Saira Bibi, Amjad Hussain, Hafiz Ali Muhammad, Rak-Hyun Song
Summary: Controlling the drying rate enables the formation of a continuous film-like active catalyst on the cathode of solid oxide fuel cells, leading to significantly improved performance and durability of the cells.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Materials Science, Ceramics
Qifei Zhang, Yunting Hou, Li Chen, Lijun Wang, Kuochih Chou
Summary: The study found that adding GDC material in anode-supported H-SOFC can increase oxygen vacancy concentration and three-phase reaction interface to improve oxygen adsorption and dissociation rate at low temperatures, thereby enhancing cell performance and stability.
CERAMICS INTERNATIONAL
(2022)
Article
Energy & Fuels
Zhijun Liu, Yegui Fang, Jianxin Wang, Chensheng Ma, Youkun Tao, Jing Shao
Summary: The development of a cobalt-free cathode with long-term stability and high electrochemical activity is crucial for low-cost and robust solid oxide fuel cells (SOFCs). In this study, we achieved performance enhancement of a cobalt-free cathode by regulating the valence of ferrite-based perovskite. We developed a cathode material, La0.8Sr0.2Fe0.8Ni0.15Nb0.05O3-delta, through co-doping high valence niobium with low valence nickel, which exhibited adequate conductivity, thermal compatibility, superior electrochemical properties, and excellent discharge durability. This enhanced performance is attributed to the synergistic effects induced by the co-doping, which regulate the electronic structure and optimize the balance among various factors.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Article
Chemistry, Physical
Jihao Zhang, Libin Lei, Hangyue Li, Kaihua Sun, Zaihong Sun, Minfang Han
Summary: High fuel utilization rate is crucial for achieving high power generation efficiency in solid oxide fuel cells, but severe concentration polarization poses a challenge to cell performance. Cell resistance is a more suitable and robust criterion for limiting current behavior, and setting a resistance threshold can help maintain safe operating status, especially for industrial SOFCs. The stable relationship between high reactant utilization rate and limiting current behavior provides valuable information for fuel sensitivity analysis.
JOURNAL OF POWER SOURCES
(2021)
Article
Materials Science, Ceramics
Xu Han, Yang Yang, Yu Fan, Hao Ni, Youmin Guo, Yan Chen, Xuemei Ou, Yihan Ling
Summary: Research has shown that incorporating five different transition metal species into high-entropy perovskite oxide cathodes can significantly enhance the electrochemical performance and catalytic activities of solid oxide fuel cells. In experiments, it was found that cathode materials with this structure showed a 1.5-fold improvement in cell performance at 800 degrees Celsius, with a significant reduction in electrode polarization resistance.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Physical
Tianyu Chen, Zhibin Lu, Guangjin Zeng, Yongmin Xie, Jie Xiao, Zhifeng Xu
Summary: The study introduces a high-performance LSGM electrolyte-supported tubular DC-SOFC stack for portable applications, which shows great potential in developing into high-performing, efficient, and environmentally friendly portable power sources for distributed applications.
JOURNAL OF POWER SOURCES
(2024)
Article
Chemistry, Physical
Wenbin Tong, Yili Chen, Shijie Gong, Shaokun Zhu, Jie Tian, Jiaqian Qin, Wenyong Chen, Shuanghong Chen
Summary: In this study, a three-dimensional porous NiO interface layer with enhanced anode dynamics is fabricated, forming a Schottky contact with the zinc substrate, allowing rapid and uniform zinc plating both inside and below the interface layer. The resulting NiO@Zn exhibits exceptional stability and high capacity retention.
JOURNAL OF POWER SOURCES
(2024)
Article
Chemistry, Physical
Yafeng Bai, Kaidi Li, Liying Wang, Yang Gao, Xuesong Li, Xijia Yang, Wei Lu
Summary: In this study, a flexible zinc ion supercapacitor with gel electrolytes, porous alpha-MnO2@reduced graphene oxide cathode, and activated carbon/carbon cloth anode was developed. The device exhibits excellent electrochemical performance and stability, even at low temperatures, with a high cycle retention rate after 5000 cycles.
JOURNAL OF POWER SOURCES
(2024)
Article
Chemistry, Physical
Anmol Jnawali, Matt D. R. Kok, Francesco Iacoviello, Daniel J. L. Brett, Paul R. Shearing
Summary: This article presents the results of a systematic study on the electrochemical performance and mechanical changes in two types of commercial batteries with different anode chemistry. The study reveals that the swelling of anode layers in batteries with silicon-based components causes deformations in the jelly roll structure, but the presence of a small percentage of silicon does not significantly impact the cycling performance of the cells within the relevant state-of-health range for electric vehicles (EVs). The research suggests that there is room for improving the cell capacities by increasing the silicon loading in composite anodes to meet the increasing demands on EVs.
JOURNAL OF POWER SOURCES
(2024)
Article
Chemistry, Physical
Yohandys A. Zulueta, My Phuong Pham-Ho, Minh Tho Nguyen
Summary: Advanced atomistic simulations were used to study ion transport in the Na- and K-doped lithium disilicate Li2Si2O5. The results showed that Na and K doping significantly enhanced Li ion diffusion and conduction in the material.
JOURNAL OF POWER SOURCES
(2024)
Article
Chemistry, Physical
Zongying Han, Hui Dong, Yanru Yang, Hao Yu, Zhibin Yang
Summary: An efficient phase inversion-impregnation approach is developed to fabricate BaO-decorated Ni8 mol% YSZ anode-supported tubular solid oxide fuel cells (SOFCs) with anti-coking properties. BaO nanoislands are successfully introduced inside the Ni-YSZ anode, leading to higher peak power densities and improved stability in methane fuel. Density functional theory calculations suggest that the loading of BaO nanoislands facilitates carbon elimination by capturing and dissociating H2O molecules to generate OH.
JOURNAL OF POWER SOURCES
(2024)
Article
Chemistry, Physical
Suresh Mamidi, Dan Na, Baeksang Yoon, Henu Sharma, Anil D. Pathak, Kisor Kumar Sahu, Dae Young Lee, Cheul-Ro Lee, Inseok Seo
Summary: Li-CO2 batteries, which utilize CO2 and have a high energy density, are hindered in practical applications due to slow kinetics and safety hazards. This study introduces a stable and highly conductive ceramic-based solid electrolyte and a metal-organic framework catalyst to improve the safety and performance of Li-CO2 batteries. The optimized Li-CO2 cell shows outstanding specific capacity and cycle life, and the post-cycling analysis reveals the degradation mechanism of the electrodes. First-principles calculations based on density functional theory are also performed to understand the interactions between the catalyst and the host electrode. This research demonstrates the potential of MOF cathode catalyst for stable operation in Li-CO2 batteries.
JOURNAL OF POWER SOURCES
(2024)
Article
Chemistry, Physical
Ganghua Xiang, Zhihuan Qiu, Huilong Fei, Zhigang Liu, Shuangfeng Yin, Yuen Wu
Summary: In this study, a CeFeOx-supported Pt single atoms and subnanometric clusters catalyst was developed, which exhibits enhanced catalytic activity and stability for the preferential oxidation of CO in H2-rich stream through synergistic effect.
JOURNAL OF POWER SOURCES
(2024)
Article
Chemistry, Physical
Dimitrios Chatzogiannakis, Marcus Fehse, Maria Angeles Cabanero, Natalia Romano, Ashley Black, Damien Saurel, M. Rosa Palacin, Montse Casas-Cabanas
Summary: By coupling electrochemical testing to operando synchrotron based X-ray absorption and powder diffraction experiments, blended positive electrodes consisting of LiMn2O4 spinel (LMO) and layered LiNi0.5Mn0.3Co0.2O2 (NMC) were studied to understand their redox mechanism. It was found that blending NMC with LMO can enhance energy density at high rates, with the blend containing 25% LMO showing the best performance. Testing with a special electrochemical setup revealed that the effective current load on each blend component can vary significantly from the nominal rate and also changes with SoC. Operando studies allowed monitoring of the oxidation state evolution and changes in crystal structure, in line with the expected behavior of individual components considering their electrochemical current loads.
JOURNAL OF POWER SOURCES
(2024)
Article
Chemistry, Physical
Chiara Cementon, Daniel Dewar, Thrinathreddy Ramireddy, Michael Brennan, Alexey M. Glushenkov
Summary: This Perspective discusses the specific power and power density of lithium-ion capacitors, highlighting the fact that their power characteristics are often underestimated. Through analysis, it is found that lithium-ion capacitors can usually achieve power densities superior to electrochemical supercapacitors, making them excellent alternatives to supercapacitors.
JOURNAL OF POWER SOURCES
(2024)
Article
Chemistry, Physical
Weihao Wang, Hao Yu, Li Ma, Youquan Zhang, Yuejiao Chen, Libao Chen, Guichao Kuang, Liangjun Zhou, Weifeng Wei
Summary: This study achieved an improved electrolyte with excellent low-temperature and high-voltage performance by regulating the Li+ solvation structure and highly concentrating it. The electrolyte exhibited outstanding oxidation potential and high ionic conductivity under low temperature and high voltage conditions, providing a promising approach for the practical application of high-voltage LIBs.
JOURNAL OF POWER SOURCES
(2024)
Article
Chemistry, Physical
Martin Bures, Dan Gotz, Jiri Charvat, Milos Svoboda, Jaromir Pocedic, Juraj Kosek, Alexandr Zubov, Petr Mazur
Summary: Vanadium redox flow battery is a promising energy storage solution with long-term durability, non-flammability, and high overall efficiency. Researchers have developed a mathematical model to simulate the charge-discharge cycling of the battery, and found that hydraulic connection of electrolyte tanks is the most effective strategy to reduce capacity losses, achieving a 69% reduction.
JOURNAL OF POWER SOURCES
(2024)
Article
Chemistry, Physical
M. Rodriguez-Gomez, J. Campo, A. Orera, F. de La Fuente, J. Valenciano, H. Fricke, D. S. Hussey, Y. Chen, D. Yu, K. An, A. Larrea
Summary: In this study, we analysed the operando performance of industrial lead cells using neutron diffraction experiments. The experiments revealed the evolution of different phases in the positive electrode, showed significant inhomogeneity of phase distribution inside the electrode, and estimated the energy efficiency of the cells.
JOURNAL OF POWER SOURCES
(2024)
Article
Chemistry, Physical
Jiawei Liu, Chenpeng Wang, Yue Yao, Hao Ye, Yinglong Liu, Yingli Liu, Xiaoru Xu, Zhicong Chen, Huazheng Yang, Gang Wu, Libin Lei, Chao Wang, Bo Liang
Summary: The study focuses on utilizing double conductive Ni-pads as anode collectors in micro-tubular solid oxide fuel cells. The simulation results show excellent performance and stability of DCNPs, and also highlight the potential applications in various fields.
JOURNAL OF POWER SOURCES
(2024)
Article
Chemistry, Physical
Yang Wang, Kangjie Zhou, Lang Cui, Jiabing Mei, Shengnan Li, Le Li, Wei Fan, Longsheng Zhang, Tianxi Liu
Summary: This study presents a polyimide sandwiched separator (s-PIF) for improving the cycling stability of Li-metal batteries. The s-PIF separator exhibits superior mechanical property, electrolyte adsorption/retention and ion conductivity, and enables dendrite-free Li plating/stripping process.
JOURNAL OF POWER SOURCES
(2024)