Article
Chemistry, Physical
Ji Min Im, Kyeong Eun Song, Harald Schlegl, Hyunil Kang, Wonseok Choi, Seung-Wook Baek, Jun-Young Park, Hyun-Suk Kim, Jung Hyun Kim
Summary: In this study, the unique microstructure and electrical properties of SmBa0.5Sr0.5Co2O5+d (SBSCO) layered perovskite cathodes with dense and porous microstructures were analyzed by changing the applied current. It was observed that unique nanostructures were formed when a high current was applied to cathodes with both dense and porous microstructures of the same chemical composition for conductivity measurement.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Multidisciplinary
Daseob Yoon, Yujeong Lee, Gi-Yeop Kim, Youngho Kang, Si-Young Choi, Junwoo Son
Summary: A simple strategy to increase electrical conductivity in perovskite oxide semiconductors has been proposed through non-stoichiometry-driven metal exsolution, leading to enhanced carrier concentration in reduced films.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Materials Science, Ceramics
Birkneh Sirak Teketel, Bayu Admasu Beshiwork, Xiaoyan Luo, Dong Tian, Shiyue Zhu, Halefom G. Desta, Quan Yang, Yonghong Chen, Bin Lin
Summary: By employing an A-site doping strategy, higher-oxygen-vacancy cobalt-free layered perovskite cathodes for high-performing protonic ceramic fuel cells at reduced temperatures are achieved. Both Nd and K doping significantly improve the electrical conductivities of the cathodes and promote the single-cell output performance.
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Multidisciplinary
Hongfei Chen, Zhe Lu, Zhipeng Liu, Yujie Wu, Shuai Wang, Zhihong Wang
Summary: Tuning the Fe-site element type of PrFeO3-delta through Sr and Nb co-doping enhances its anodic catalytic performance and maintains structural stability.
Article
Nanoscience & Nanotechnology
Binze Zhang, Shaowei Zhang, Hairui Han, Kaibin Tang, Changrong Xia
Summary: The partial replacement of iron element with gallium in PrBaFe2O5+delta can improve its electrochemical performance as a cathode material for intermediate-temperature solid oxide fuel cells. Specifically, PrBaFe1.9Ga0.1O5+delta exhibits improved physicochemical properties and electrochemical properties, such as an increased oxygen surface exchange coefficient (kchem) and enhanced oxygen dissociation process. Moreover, the anode-supported single cell with PBFG0.1 cathode shows a higher peak power density and good stability in long-term operation.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Physical
Kyeong Eun Song, Harald Schlegl, Hyunil Kang, Wonseok Choi, Jung Hyun Kim
Summary: The composition of layered perovskite SmBa0.5Sr0.5Co2O5+d was modified to different non-stoichiometric compositions by altering the substitution amount of Ba and Sr. SmBa0.45Sr0.5Co2O5+d (SBSCO-0.45/0.5) exhibited the lowest area specific resistance (ASR) due to its largest area % caused by high binding energy (HBE) of O1s in X-ray photoelectron spectroscopy (XPS) analysis and smaller unit cell volume compared to other compositions. SmBa0.5Sr0.48Co2O5+d (SBSCO-0.5/0.48), with the least decrease in oxygen content and the largest area % of Co3+ and Co4+ coexistence regions of Co2p in XPS analysis, showed the highest electrical conductivity. The electrical conductivity values and behaviors of porous SBSCO-0.45/0.5 and SBSCO-0.5/0.48 were not significantly different. Comparison between single-cell performances with composite cathodes of SBSCO-0.45/0.5 and SBSCO-0.5/0.48 with CGO91 revealed that the single-cell with SBSCO-0.45/0.5 and CGO91 cathode exhibited higher maximum power density.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Physical
Chengzhi Sun, Yu Kong, Yongchao Niu, Xiaoju Yin, Naiqing Zhang
Summary: As a classical family of high-performance cathode materials, mixed ionic and electronic conductor (MIEC) is crucial for the low-temperature operation and high efficiency of solid oxide fuel cells. While Fe-based double perovskites have advantages of low cost, good thermal compatibility with the electrolyte, and high-temperature stability, their electrochemical properties for oxygen reduction reaction are unsatisfactory. This study demonstrates that substituting Zr for Fe in NdBaFe2O6??Δ (NBF) lattice can enhance oxygen vacancy concentration and the position of O p-band center, leading to improved oxygen reduction performance for the Zr-doped NBF cathode.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Soon-Mok Choi, Eun-Ji Meang, Jang-Yeul Tak, Won-Seon Seo, Soonil Lee
Summary: The calcium vanadium oxide (CaVxO3-delta) system shows promise as an alternative oxide anode material with high electrical conductivity and stability, making it suitable for solid oxide fuel cell (SOFC) technology and other applications.
SCRIPTA MATERIALIA
(2022)
Article
Materials Science, Ceramics
Kyeong Eun Song, Harald Schlegl, Chan Gyu Kim, Ki Sang Baek, Yu Ri Lim, Jung Hyun Nam, Hyun Suk Kim, Jung Hyun Kim
Summary: The electrical conductivity characteristics of SmBaCo2O5+d (SBCO) and SmBa0.5Sr0.5Co2O5+d (SBSCO) were studied by changing the microstructure characteristics. SBCO and SBSCO with dense microstructure showed different conductivity behaviors, while the porous cathode showed high semiconductor conductivity. The porous cathode exhibited higher conductivity when the measurement temperature was decreased.
CERAMICS INTERNATIONAL
(2022)
Article
Multidisciplinary Sciences
Jaemin Kong, Yongwoo Shin, Jason A. Rohr, Hang Wang, Juan Meng, Yueshen Wu, Adlai Katzenberg, Geunjin Kim, Dong Young Kim, Tai-De Li, Edward Chau, Francisco Antonio, Tana Siboonruang, Sooncheol Kwon, Kwanghee Lee, Jin Ryoun Kim, Miguel A. Modestino, Hailiang Wang, Andre D. Taylor
Summary: A fast and reproducible doping method has been reported in this study, involving bubbling a spiro-OMeTAD:LiTFSI solution with CO2 under ultraviolet light. This method quickly promotes p-type doping of spiro-OMeTAD, resulting in significantly higher conductivity without the need for any post-treatments.
Article
Chemistry, Physical
Zhiying Han, Jinghe Bai, Xu Chen, Xiaofei Zhu, Defeng Zhou
Summary: The cobalt-free Nb-doped Pr2Ni1-xNbxO4 perovskite oxides exhibit enhanced ORR catalytic activity and stability, making them suitable for commercial applications in medium temperature solid oxide fuel cells. Through detailed study on the effects of Nb-doping on the cathode material properties, Pr2Ni0.9Nb0.1O4 was found to have the highest performance with improved long-term stability.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Physical
Quan Yang, Guoqing Wang, Haodong Wu, Bayu Admasu Beshiwork, Dong Tian, Shiyue Zhu, Yang Yang, Xiaoyong Lu, Yanzhi Ding, Yihan Ling, Yonghong Chen, Bin Lin
Summary: The high-entropy cathode HEP has shown outstanding electrochemical performance in SOFCs, indicating promising potential applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Jia Song, Shaochen Zhu, De Ning, Henny J. M. Bouwmeester
Summary: The structural evolution, electrical conductivity, oxygen nonstoichiometry, and oxygen transport properties of La1-xCaxFeO3-δ perovskite-type oxides were investigated. The results showed that Ca doping is mainly compensated by formation of electron holes rather than by oxygen vacancies, and oxygen vacancy diffusion coefficient and ionic conductivity increase with increasing Ca content in the compositions. The effective migration barrier for oxygen diffusion decreases with decreasing oxygen vacancy formation enthalpy.
JOURNAL OF MATERIALS CHEMISTRY A
(2021)
Article
Materials Science, Ceramics
Duke P. C. Shih, Ainara Aguadero, Stephen J. Skinner
Summary: This study investigates the effect of A-site monovalent ions (K+ and Li+) on the electrical conductivity of NBT. The results show that partial replacement of Bi3+ with monovalent ions significantly improves the ionic conductivity, possibly due to an increase in oxygen vacancy concentration. The isotope exchange depth profile method confirms that oxygen ions are the main charge carriers.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Juan Basbus, Mauricio Arce, Horacio Troiani, Fernando Prado, Liliana Mogni, Adriana Serquis
Summary: The study systematically investigated the high temperature properties of BaCe0.4Zr0.4Pr0.2O3-delta, exploring its potential application as a PC-SOFC cathode through conductivity measurements and structural analysis. It was found that the compound has low conductivity but good thermomechanical compatibility with electrolytes.
NEW JOURNAL OF CHEMISTRY
(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)