Article
Chemistry, Physical
Yonghyun Lim, Junghum Park, Hojae Lee, Miju Ku, Young-Beom Kim
Summary: Rapid fabrication of an LSCF cathode using the novel FLS method effectively suppresses secondary phase formation at the LSCF/YSZ interface, while also greatly simplifying the SOFC fabrication process.
Article
Chemistry, Physical
Sevim Erdo, Emrah Demirkal, Melek Turksoy Ocal, Ali Sems Ahsen, Meltem Sezen Ozkoc, Cleva Ow-Yang, Aligul Buyukaksoy
Summary: Gadolinia-doped ceria (GDC) interlayers are effective in preventing the formation of resistive phases at the interface of the mixed ionic electronic conductor (MIEC) (La,Sr)CoO3 (LSC) air electrode/yttria stabilized zirconia (YSZ) electrolyte. In this study, the impact of GDC interlayer on the phase and surface chemistry evolution of the LSC electrode and YSZ electrolyte interface was investigated. The introduction of GDC interlayer significantly improved the electrochemical performance of the system.
SOLID STATE IONICS
(2022)
Article
Chemistry, Physical
Junghum Park, Hojae Lee, Yonghyun Lim, Seok-Won Kong, Pei-Chen Su, Young Beom Kim
Summary: Research shows that utilizing a composite cathode material structure and employing a novel flash light sintering process can achieve high-performance solid oxide fuel cells at lower operating temperatures. This approach not only addresses high temperature manufacturing issues but also reduces process time and suppresses side reactions at the cathode/electrolyte interface.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Jun Yang, Lu Chen, Dongmin Cai, Hua Zhang, Jianxin Wang, Wanbing Guan
Summary: This study investigated the Sr segregation behavior in LSCF under compression to simulate the operating condition of LSCF electrode in an assembled SOC stack. The compression load was found to suppress the formation of SrO on the surface of LSCF, improving durability significantly. Furthermore, the type of materials (YSZ, GDC, and Pt) in contact with LSCF also influenced Sr segregation in LSCF, with compression inducing more SrO formation when in contact with YSZ compared to GDC and Pt.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Physical
Chuangang Yao, Jixing Yang, Sigeng Chen, Jian Meng, Kedi Cai, Qingguo Zhang
Summary: The study investigated the effects of Cu doping on SrFe0.9-xCuxW0.1O3-delta samples as SOFC cathode materials. Cu doping decreased the oxygen content, leading to decreased electrical conductivity and increased thermal expansion coefficient. Within a certain range, Cu doping can reduce ASR values and enhance the activation energy for ORR.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Dhruba J. Deka, Jaesung Kim, Seval Gunduz, Deeksha Jain, Yingjie Shi, Jeffrey T. Miller, Anne C. Co, Umit S. Ozkan
Summary: This study investigates the influence of A-site occupancy on carbon formation during CO2 electrolysis. Modulating A-site occupancy can affect electronic and ionic conductivities, as well as the surface chemistry of catalysts, thereby promoting carbon formation.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2021)
Article
Chemistry, Physical
Xiao Chen, Senran Hao, Tengda Lu, Mian Li, Lina Han, Peng Dong, Jie Xiao, Xiaoyuan Zeng, Yingjie Zhang
Summary: Direct carbon solid oxide fuel cell (DC-SOFC) is a potential and prospective technology for converting chemical energy from coal fuels into electricity with high efficiency and environmental friendliness. In this study, vanadium-doped B-site-deficient La0.5Sr0.5FeO3-delta (LSFVx) perovskite materials were synthesized and developed as the anode of DC-SOFCs for brown coal utilization. The electrochemical performances of the vanadium-doped perovskites were greatly improved compared to pure LSF, indicating that vanadium doping can effectively expand the three-phase reaction boundaries of the cell and enhance catalytic activity.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Ceramics
Dingyu Xiong, Sefiu Abolaji Rasaki, Yangpu Li, Liangdong Fan, Changyong Liu, Zhangwei Chen
Summary: The oxygen reduction reaction (ORR) activity of tantalum-doped LSCF materials was investigated, showing improved performance at lower temperatures. These materials have the potential to be promising cathode materials for solid oxide fuel cells (SOFCs).
JOURNAL OF ADVANCED CERAMICS
(2022)
Article
Engineering, Electrical & Electronic
Waseem Raza, Ghulam Nabi, Asim Shahzad, Nafisa Malik, Nadeem Raza
Summary: The synthesis and characterization of lanthanum cerium ferrite nanoparticles indicate that the hydrothermal-synthesized J2 electrode exhibits high specific capacitance and cycling stability, making it a promising candidate for supercapacitor applications.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Chemistry, Physical
Wenming Xu, Chengyu Li, Tao Hong, Xiang Pan, Yingwei Lu
Summary: CaO is demonstrated to enhance the performance of intermediate-temperature solid oxide fuel cells. It reduces interfacial polarization resistance, improves the oxygen reduction reaction kinetics and increases the peak power density of the cells.
Article
Chemistry, Physical
Goknur Donmez, Tuba Guerkaynak Altincekic, Vedat Sariboga, Mehmet Ali Faruk Oksuzomer
Summary: Ce1 - xYxO2 - x/2 (YDC) powders were successfully prepared via polyol method, and all the prepared YDC powders exhibited a single-phase fluorite structure after calcination at 500 degrees C. The nominal dopant concentrations of YDC samples were in good agreement with the values obtained by EDS. The crystallite sizes varied depending on the dopant concentration, and the lattice parameters of YDC samples followed Vegard's law. YDC pellets with high relative densities were obtained by sintering at 1400 degrees C for 6 hours. The ionic conductivities of YDC pellets significantly increased until x = 0.15, reaching 2.23 x 10(-2) S cm(-1) for YDC15 at 800 degrees C. YDC20 showed a small increase of 12% in ionic conductivity at the same measurement temperature, reaching 2.5 x 10(-2) S cm(-1).
Article
Chemistry, Inorganic & Nuclear
T. L. Simonenko, N. P. Simonenko, E. P. Simonenko, N. T. Kuznetsov
Summary: The features of the glycol-citrate synthesis process for highly dispersed oxide La0.6Sr0.4Co0.2Fe0.8O3 - delta with varying concentrations of the oxidizing and reducing agents were studied. The results showed that the synthesis conditions could reduce the formation temperature of single-phase highly dispersed oxides, which are promising as cathode materials for medium-temperature solid oxide fuel cells.
RUSSIAN JOURNAL OF INORGANIC CHEMISTRY
(2022)
Article
Chemistry, Applied
Lijun Fan, Jun Wang, Zhiyong Huang, Xueli Yao, Nianjun Hou, Tian Gan, Juanjuan Gan, Yicheng Zhao, Yongdan Li
Summary: In this study, the surface properties of La0.6Sr0.4Co0.2Fe0.8O3-delta (LSCF) perovskite electrode were modified with HNO3 treatment to improve its catalytic activity towards oxygen reduction reaction. The acid etching reduced the surface concentrations of A-site cations and suppressed the segregation of Sr on the surface. The HNO3 treatment also led to the formation of highly reactive oxygen species and Fe4+ species on the surface, accelerating the reduction of oxygen species adsorbed on the LSCF surface.
Article
Chemistry, Physical
Runze Liu, Fen Zhou, Jianquan Gao, Yonghe Zhang, Jinxiao Bao, Xiwen Song
Summary: In this study, Ce0.95-xDyxCa0.02Bi0.03O2-delta electrolyte powders were synthesized via the sol-gel method. The properties of the powders were characterized, and it was found that Ce0.85Dy0.1Ca0.02Bi0.03O1.915 showed the highest oxygen vacancy concentration and the best electrical conductivity, making it a promising electrolyte material for intermediate-temperature solid oxide fuel cells.
Article
Materials Science, Multidisciplinary
J. G. R. Hernandez-Arteaga, H. Moreno-Garcia, A. G. Rodriguez
Summary: CeO2 thin films doped with Gd showed variations in lattice parameters and electron concentration with different Gd concentrations. Raman spectroscopy revealed phonon shifts related to changes in atomic bonding length and the presence of oxygen vacancies. Two p-n junctions were formed with CeO2:Gd layer, confirming the doping of CeO2 with Gd.
Article
Chemistry, Multidisciplinary
J. Y. Chong, B. Wang, K. Li
CHEMICAL COMMUNICATIONS
(2018)
Article
Chemistry, Physical
Tatiya Khamhangdatepon, Vut Tongnan, Matthew Hartley, Thana Sornchamni, Nuchanart Siri-Nguan, Navadol Laosiripojana, Kang Li, Unalome Wetwatana Hartley
Summary: In this study, La0.3Sr0.7Co0.7Fe0.3O3 (LSCF3773) was used as an oxygen carrier material for synthesis gas production, and synthesized using the EDTA citrate complexing method. Different structures and active sites were observed at various reduction temperatures.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Engineering, Chemical
Maria Kazakli, Greg A. Mutch, Georgios Triantafyllou, Ana Gouveia Gil, Tao Li, Bo Wang, Josh J. Bailey, Dan J. L. Brett, Paul R. Shearing, Kang Li, Ian Metcalfe
Summary: Dual-phase molten salt-ceramic membranes show high permselectivity for CO2 when molten carbonate is supported in a porous oxygen-ion and/or electron conductor. In experiments with an inert support, controlled distribution of molten carbonate within hollow-fibre membranes led to increased CO2 permeation rates. The results suggest that increasing the interfacial area for desorption of CO2 is key in enhancing permeation rates.
JOURNAL OF MEMBRANE SCIENCE
(2021)
Article
Engineering, Chemical
Vatsal Shah, Bo Wang, Kang Li
Summary: PVDF membranes prepared by the combined crystallisation and diffusion technique showed superior permeation rates compared to conventional methods, and by blending PMMA into PVDF-DMSO solutions, the pore size was reduced from 30 nm to 15 nm without changing operational conditions. The pore size reduced with increasing PMMA concentration in the membranes, but pure water flux did not decline, and higher molecular weight PMMA resulted in smaller pore size in the membranes.
JOURNAL OF MEMBRANE SCIENCE
(2021)
Article
Engineering, Chemical
Sadao Araki, Ryosuke Yamashita, Kang Li, Hideki Yamamoto
Summary: An amorphous silica hollow fiber was prepared by the phase inversion method, and the effects of calcination temperature on its properties were investigated. A silica CHA zeolite membrane was synthesized on the silica hollow fiber support with relatively high CO2 permeance and CO2/CH4 selectivity achieved. Membranes prepared using seeding method showed improved CO2/CH4 selectivity and permeance compared to conventional CHA zeolite membranes.
JOURNAL OF MEMBRANE SCIENCE
(2021)
Article
Engineering, Chemical
Vatsal Shah, Nicholaus Prasetya, Kang Li
Summary: The PVDF CCD membranes produced by the CCD method show higher pure water fluxes compared to conventional membrane manufacturing technology, but most are hydrophobic and prone to fouling. The PDA modification technique is used to improve hydrophilicity, but longer modification times lead to decreased permeability due to pore blockage. Shorter duration modification (2 hours) results in the best overall permeation performance in fouling studies.
JOURNAL OF MEMBRANE SCIENCE
(2021)
Article
Engineering, Chemical
Tongrong Wu, Farhad Moghadam, Kang Li
Summary: In this study, nano-scale pores were created on graphene oxide nanosheets through mild chemical etching to improve water permeance and dye rejection performance in porous hollow fiber membranes.
JOURNAL OF MEMBRANE SCIENCE
(2022)
Article
Engineering, Environmental
Hao Peng, Andrijana Minic, Kornkamol Banjerdteerakul, Kang Li
Summary: A COF-300/PVDF composite was developed as a high-performance adsorbent for PAHs removal, showing superior adsorption capacity, kinetics, and removal efficiency compared to COF-300 powders. It holds great potential for practical applications in PAHs removal.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Chemical
Hao Peng, Vatsal Shah, Kang Li
Summary: Phase inversion plays a vital role in membrane technology for economic production of polymeric membrane and energy-saving wastewater treatment. However, existing phase inversion membranes often have low permeance, limiting their efficiency in separation processes.
JOURNAL OF MEMBRANE SCIENCE
(2023)
Article
Engineering, Chemical
Kornkamol Banjerdteerakul, Farhad Moghadam, Hao Peng, Kang Li
Summary: For the first time, a new approach was proposed to prepare porous hollow fiber (HF) yttria-stabilized zirconia (YSZ) substrates with small-diameter (660-790 μm, outer diameter (OD)) by stretching the nascent HF using gravitational force. Using a delayed phase inversion, a plurality of radial micro-channels opening from the interior surface of HFs can be realized. The resultant HF substrates show promising permeation characteristics and good fracture strength, and small-diameter HF substrates with higher surface curvature ensured the fabrication of porous GO (PGO) membranes with better dye separation performance.
JOURNAL OF MEMBRANE SCIENCE
(2023)
Article
Engineering, Chemical
Kornkamol Banjerdteerakul, Hao Peng, Kang Li
Summary: Nanofiltration is an effective method for removing emerging pharmaceuticals from waste-water to improve water quality and mitigate environmental impacts. However, the low separation efficiency of current nanofiltration membranes has hindered their development. In this study, a thin film composite membrane was prepared by stacking covalent organic framework (COF) nanosheets on a ceramic hollow fibre, showing high rejection for environmentally persistent pharmaceuticals. The COF-based nanofiltration membranes have a small footprint and can be easily integrated into existing water treatment systems, making them a promising option for mitigating the environmental impacts of emerging pharmaceuticals in wastewater.
JOURNAL OF MEMBRANE SCIENCE
(2023)
Article
Engineering, Chemical
Kornkamol Banjerdteerakul, Hao Peng, Kang Li
Summary: By employing an in-situ growth method, we successfully prepared COF-LZU1 and COF-300 membranes for the separation of polar/non-polar solvent mixtures. These composite membranes, consisting of a defect-free COF layer on a ceramic hollow fiber substrate, exhibited high solvent fluxes and achieved high separation factors for various azeotropic mixtures. Our study demonstrated the technical feasibility of using COF-based membranes for the separation of azeotropic solvent mixtures.
JOURNAL OF MEMBRANE SCIENCE
(2023)
Article
Engineering, Chemical
Hao Peng, Kang Li
Summary: In this study, a novel approach combining non-solvent-induced phase separation (NIPS) with crystallisation and diffusion (CCD) technique, called NIPS-CCD, was proposed to enhance the permeation of polyethersulfone (PES) ultrafiltration membrane. The NIPS-CCD method showed a 50-fold increase in water permeation to 771 LMH bar-1 with pore size of 6-7 nm. This approach can be easily adapted for other high-performance membrane materials, making it a promising strategy for improving membrane permeation properties.
JOURNAL OF MEMBRANE SCIENCE
(2023)
Article
Engineering, Chemical
Kornkamol Banjerdteerakul, Hao Peng, Kang Li
Summary: Covalent organic frameworks (COFs) have shown potential as membrane materials for water purification and organic solvent nanofiltration due to their adjustable pore size and ease of functionalisation. However, current COF membranes are limited in their mechanical stability and structural integrity when applied on flexible polymeric substrates. In this study, COF-LZU1 membranes were fabricated on pre-designed ceramic hollow fibres using direct interfacial polymerisation, resulting in highly crystalline and defect-free COF layers. The membranes exhibited high pure water permeance and rejection rates for dyes, highlighting their potential for enhanced process intensification.
JOURNAL OF MEMBRANE SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Vatsal Shah, Bo Wang, Kang Li
Summary: This study applies a new method to improve the permeation performance of PVDF membranes without sacrificing separation efficiency. By using a simple dual-casting technique, the specific properties of the membranes' separation and support layers can be tailored.
ENERGY & ENVIRONMENTAL SCIENCE
(2021)