Article
Engineering, Environmental
Louis-B Jugnia, Dominic Manno, Abraham Gomez Vidales, Sabahudin Hrapovic, Boris Tartakovsky
Summary: This study demonstrated that the efficiency of removing selenite and selenate in bioelectrochemical barriers is significantly higher compared to anaerobic biobarriers. By simultaneously operating multiple setups and adjusting operating parameters, enhanced removal of selenium species under bioelectrochemical conditions was achieved.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Engineering, Chemical
Juntao Zhu, Xuchen Ba, Xiaobin Guo, Qi Zhang, YuanFeng Qi, Yifan Li, Juan Wang, Haofen Sun, Bo Jiang
Summary: This study reveals the interference of electrochemically generated toxic oxychlorides on COD determination and the influence of different cathode materials on COD removal efficiency in treating saline wastewater.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Environmental Sciences
Alan Chang Bejarano, Pascale Champagne
Summary: This study conducted batch and bench-scale experiments to investigate the factors affecting the performance of anaerobic reactors, including pH fluctuations, ammonia inhibition, and bioaugmentation. The results showed that electrode-assisted anaerobic digestion can increase biogas production, and bioaugmentation also has a positive effect on increasing biogas production.
Article
Chemistry, Multidisciplinary
Kathryn Holguin, Kaiqiang Qin, Jinghao Huang, Chao Luo
Summary: In this study, a novel organic electrode material, K-DCA, was developed with reversible reaction with potassium ions, exhibiting high specific capacity and sustainable cycling. The composite material, K-DCA-NrGO, coupled with nitrogen-doped reduced graphene oxide, showed higher specific capacity and increased capacity retention.
NEW JOURNAL OF CHEMISTRY
(2022)
Article
Energy & Fuels
Yadong Wang, Wenhua Cheng, Wei Wang, Yudai Huang
Summary: Dual-site doping of Cu2+ in single-crystal LiNi(0.5)Co(0.2)Mn(0.3)O(2) improves the high voltage stability and rate performance of the material, with a capacity retention rate of 82.2% after 200 cycles. This work provides a guideline for stabilizing the ontological structure of single-crystal cathode materials.
Article
Environmental Sciences
Felipe Torres-Rojas, Diana Munoz, Camila Pia Canales, Samuel A. Hevia, Felipe Leyton, Nicolas Veloso, Mauricio Isaacs, Ignacio T. Vargas
Summary: This study evaluated the performance of a new electrotrophic perchlorate reducing microorganism (EPRM), Dechloromonas sp. CS-1, in removing perchlorate from water using a bioelectrochemical reactor (BER) with a chemically modified electrode. The results showed that the BERs with the modified electrode and the presence of EAM achieved high cathodic efficiency and removal rate. This study demonstrates the synergistic effect of EPRM and chemically modified electrodes on perchlorate removal in a BER.
ENVIRONMENTAL RESEARCH
(2023)
Article
Chemistry, Multidisciplinary
Ying Hua, Yuanzhu Huang, Yujie Wang, Ya Du, Haishen Yang
Summary: A novel redox-active molecule, lithium bis(2,3-dihydroxyphenazine)borate (LDPB), was successfully synthesized using a spiroborate salification strategy from 2,3-dihydroxyphenazine (DHP), showing better cycling stability, rate performance, and capacity retention as a lithium storage material. This strategy could potentially be an efficient approach for constructing novel organic electrode materials.
NEW JOURNAL OF CHEMISTRY
(2021)
Article
Green & Sustainable Science & Technology
Secil Tutar Oksuz, Haluk Beyenal
Summary: Increasing electrode surface area can enhance TN removal rate, while it has a limited impact on COD removal rate in BES. Our results demonstrate the feasibility of simultaneous COD and TN removal in the BES system. Microbial community structure analysis revealed that nitrogen removal was mainly influenced by sulfidogenesis, anodic ammonia oxidation, autotrophic and heterotrophic denitrification processes.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2021)
Article
Electrochemistry
Minseok Song, Munnyeong Choi, Song-Yul Choe
Summary: In this paper, a new strategy for cold start-up is proposed using an electrochemical, thermal, and mechanical life model. The developed model is experimentally validated and further analysis provides detailed mechanisms of degradation. A new charging algorithm is also developed targeting the start-up strategy at subzero temperature, which has shown improved charging efficiency and cycle life compared to traditional methods.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2023)
Article
Chemistry, Physical
Myoungki Min, Eunyoung You, Seung Woo Lee, Chanho Pak
Summary: The study addressed the issue of electrode degradation in fuel cell electric vehicles by synthesizing carbon-supported IrRuOx catalysts and applying them to the cathode, significantly improving the durability of the MEA.
JOURNAL OF POWER SOURCES
(2021)
Article
Chemistry, Physical
Shangqian Xu, Jiechun Liang, Yunduo Yu, Rulin Liu, Yao Xu, Xi Zhu, Yu Zhao
Summary: This study uses machine learning to train materials with different redox potentials to predict novel polymers with ideal potentials, breaking the balance between redox potential and specific capacity to increase energy density. In situ computer vision and infrared spectroscopy monitor the reaction in real time. Theoretical studies on concentration-dependent yields were also conducted by providing a depletion-force model.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Engineering, Environmental
Zhonghua Wang, Hui Qiao, Zhongchen Yu, Xue Yang, Ziyu Tang, Wei Zhou, Haiqian Zhao
Summary: This study analyzed the impact of various active substances on the removal of COD in benzene-containing wastewater in the electro-Fenton system, and found that the •OH generated by the cathode has the greatest contribution to COD removal. By improving the utilization rate of •OH and reducing ineffective consumption, the efficiency of COD removal can be increased.
JOURNAL OF WATER PROCESS ENGINEERING
(2022)
Article
Chemistry, Multidisciplinary
Evgeniya Vorobyeva, Franziska Lissel, Mathieu Salanne, Maria R. Lukatskaya
Summary: In this Perspective, the vision of fast charging and self-healable energy systems is outlined, which are primarily organic and operate with ions other than lithium. Using conductive oligomers as configurable building blocks, adaptive conductive polymeric networks can be created, rejuvenated, and recycled. Functionalization with redox-active side chains and metal center-complexing ligands allows for high charge storage capacity, while cross-linking with metal ions yields high-performing electrode materials. This oligomer-based approach provides exceptional control over the design of organic-based battery materials.
Article
Chemistry, Inorganic & Nuclear
Shoyebmohamad F. Shaikh, Sikandar Aftab, Bidhan Pandit, Abdullah M. Al-Enizi, Mohd Ubaidullah, Satish Ekar, Sajjad Hussain, Yogesh B. Khollam, Pravin S. More, Rajaram S. Mane
Summary: The successful deployment of sodium-ion batteries requires high-performance, sustainable, and cost-effective anode materials with a high current density. In this study, sodium disulphide (NiS2) was prepared as a composite with activated carbon (C) using a hydrothermal synthesis route. The NiS2/C composite exhibited well-defined diffraction peaks of NiS2 in the X-ray diffraction pattern, and had a surface area close to 148 m^2 g^-1 according to the Brunauer-Emmett-Teller (BET) study. With a current density of 50 mA g^-1, the NiS2/C composite showed a high capacity of 480 mA h g^-1 during the initial cycle, which decreased to 333 mA h g^-1 after 100 cycles. It also demonstrated exceptional rate capability, delivering a capacity of 270 mA h g^-1 at a high current density of 2000 mA g^-1. Ex situ X-ray absorption near edge structure (XANES) and extended X-ray absorption fine structure (EXAFS) analyses provided insights into the chemical bonding and changes during electrochemical redox cycling, improving the understanding of the sodium storage mechanism and offering guidance for developing high-performance electrode materials for rechargeable sodium-ion batteries.
DALTON TRANSACTIONS
(2023)
Article
Environmental Sciences
Jianxiang Jin, Qun Wang, Lin Yang, Weixing Ma, Xuan Li, Bairen Yang, Zhuqiu Sun, Zhaoxia Li
Summary: The start-up of an integrated anaerobic-aerobic bioreactor (IAAB) was achieved by gradually increasing the organic loading rate (OLR) of artificial wastewater, using glucose as the sole carbon source. After continuous operation for 96 days, the system reached stability. The running indicators were chemical oxygen demand (COD), ammonium nitrogen (NH3-N), and volatile fatty acid (VFA). The stable indicators included biomass concentration, particle size distribution, dehydrogenase activity (DHA), coenzyme F-420 content, extracellular polymeric substances (EPS), shape, and micro-compositions of granular sludge. The results showed that the system exhibited good COD and NH3-N removal capabilities, and the formation of sludge granules in the anaerobic compartment was crucial for the start-up and stability of the IAAB. Each section of the anaerobic process had a distinct separating function.
WATER AIR AND SOIL POLLUTION
(2023)
Article
Chemistry, Multidisciplinary
Mohamed Mokhtar, Sarah E. Dickson, Younggy Kim, Waleed Mekky
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2018)
Article
Biotechnology & Applied Microbiology
Hui Guo, Younggy Kim
BIOTECHNOLOGY FOR BIOFUELS
(2019)
Article
Green & Sustainable Science & Technology
Hui Guo, Pengyi Yuan, Vladimir Pavlovic, John Barber, Younggy Kim
Summary: This study examined the potential of bipolar membrane electrodialysis (BMED) without anion exchange membranes for practical ammonia separation from wastewater, resulting in high-purity ammonium sulfate production with improved ammonia recovery and concentration. By removing anion exchange membranes, membrane fouling problems on AEMs were eliminated and impurity anions were completely excluded from the recovered ammonium sulfate solution.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Engineering, Environmental
Nicholas Piccolo, Rajeev Goel, Spencer Snowling, Younggy Kim
Summary: This study investigated the effect of high initial sulfate concentration on anaerobic digestion of wastewater sludge using lab-scale batch experiments. Results showed that increased sulfate doses led to decreased biogas and methane production, but did not have a toxic effect on methane production. High sulfate concentrations had no negative effects on COD removal or VSS destruction, indicating negligible inhibition by sulfide toxicity.
WATER ENVIRONMENT RESEARCH
(2021)
Article
Engineering, Environmental
Ahmed Elsayed, Michael Hurdle, Younggy Kim
Summary: In MABR systems, ammonia removal rate is influenced by factors such as ammonia loading rate, oxygen supply, and pH. Maintaining proper biofilm thickness and sufficient mixing conditions are essential for promoting denitrification and nitrification in the system.
JOURNAL OF WATER PROCESS ENGINEERING
(2021)
Article
Environmental Sciences
Ahmed Elsayed, Younggy Kim
Summary: Microplastic beads are an emerging contaminant that can cause serious environmental and public health problems. This study investigates the degradation of high-density polyethylene beads by hydrolytic enzymes, specifically lipase and protease, under various experimental conditions such as temperature. The results suggest that hydrolytic enzymes can be an efficient technology for large-scale polyethylene bead removal, especially in anaerobic digestion processes.
ENVIRONMENTAL POLLUTION
(2022)
Article
Environmental Sciences
Ahmed Elsayed, Jaecheul Yu, Taeho Lee, Younggy Kim
Summary: This study proposed a real-time aeration scheme based on nitrite concentration to control the competition between nitrite oxidizing bacteria (XNOB) and Anammox bacteria (XANA) in single-stage Anammox processes. The simulation results showed that maintaining dissolved oxygen (DO) at around 0.10 mg-O2/L was ideal for effective nitrite creation by ammonia oxidizing bacteria (XAOB) while slowing down the growth of XNOB. Nitrite concentration was found to be the rate-limiting parameter for efficient nitrogen removal in single-stage Anammox processes.
ENVIRONMENTAL RESEARCH
(2022)
Article
Engineering, Environmental
Basem S. Zakaria, Hui Guo, Younggy Kim, Bipro Ranjan Dhar
Summary: This study examines the significance of propionate to acetate ratios on microbial syntrophy and competition in microbial electrolysis cell-assisted anaerobic digestion. The research finds that low ratios of propionate to acetate maintain efficient syntrophy among electroactive bacteria, hydrogenotrophic methanogens, and homoacetogens, leading to higher methane yields. In contrast, higher ratios are detrimental to methanogenesis and promote the enrichment of H2-utilizing acetogens, triggering competition with hydrogenotrophic methanogens. The study also reveals that increasing propionate levels inhibit microbial electroactivity. Overall, these insights contribute to the understanding of anaerobic syntrophy and can be helpful in controlling MEC-AD operation.
Article
Engineering, Environmental
Abdelrahman Amer, Younggy Kim
Summary: A mathematical model was developed to investigate the competition between PHA accumulators and non-PHA accumulators in mixed cultures. The model successfully simulated experimental data and revealed the impact of microbial diversity on PHA enrichment. The model can be applied to control the cultivation and enrichment of PHA accumulators in large-scale PHA production systems.
WATER ENVIRONMENT RESEARCH
(2022)
Article
Biotechnology & Applied Microbiology
Abdelrahman Amer, Younggy Kim
Summary: This study investigated the effect of growth conditions on the metabolic responses of Cupriavidus necator. The results showed that C. necator can rapidly grow under heterotrophic, autotrophic, and mixotrophic conditions, but the lag phase is significantly extended with nonacetate organic substrates, high acetate concentrations, and high O2 and CO2 partial pressures.
APPLIED AND ENVIRONMENTAL MICROBIOLOGY
(2023)
Article
Construction & Building Technology
Feras Alsheet, A. Ghani Razaqpur, Younggy Kim
Summary: A chloride binding model was proposed, which consisted of physical adsorption and chemical ion exchange. The chemical binding part was quantified based on the thermodynamic equilibrium of relevant hydrated phases, while the physical adsorption was modeled using a Freundlich-type isotherm. The results of the proposed model were compared with experimental data and found to be satisfactory. The model was implemented in the Nernst-Planck-Poisson (NPP) reactive transport model, accurately predicting the concentration profiles of free and total chloride in cement paste and concrete specimens. Comparison with a traditional chloride diffusion model showed that using a well-established formula to estimate the apparent diffusion coefficient and applying it in Fick's model resulted in significantly erroneous estimates compared to experimental data. Finally, the NPP model revealed that chloride transport by diffusion was limited to the region near the exposed surface, while electromigration dominated in the concrete bulk.
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2022)
Article
Engineering, Environmental
Hui Guo, Younggy Kim
Summary: This study revealed that membrane scaling issues caused by calcium and magnesium precipitation are common in electrodialysis for nutrients recovery from wastewater. The observed scalants on ion-exchange membranes mainly include vaterite, amorphous calcium carbonate, and struvite, with potential damage to the membranes. The formation of struvite due to high phosphate concentration in wastewater leads to gradual loss of magnesium ions, further exacerbating the membrane scaling problem.
ENVIRONMENTAL ENGINEERING SCIENCE
(2021)
Article
Engineering, Environmental
Yousif Hirmiz, Youngseck Hong, Younggy Kim
ENVIRONMENTAL SCIENCE-WATER RESEARCH & TECHNOLOGY
(2019)
Meeting Abstract
Chemistry, Multidisciplinary
Andrew Alex, Pengyi Yuan, Vladimir Pavlovic, John Barber, Younggy Kim
ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY
(2018)
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)