Article
Nanoscience & Nanotechnology
Ling Zhang, Wang Zhan, Yujie Dong, Tao Yang, Cheng Zhang, Mi Ouyang, Weijun Li
Summary: The preparation of conjugated polymer films via liquid/liquid interfacial Suzuki polymerization method can lead to desired structures and excellent electrochromic properties. Among the films obtained, TPA-Wu film exhibits the best film-forming quality and achieves reversible multicolor changes from transparent yellow to blue-green.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Engineering, Environmental
Seung Jae Moon, Hyo Jun Min, Chang Soo Lee, Du Ru Kang, Jong Hak Kim
Summary: A solid-state electrolyte film with high ionic conductivity, flexibility, and self-adhesive properties was developed based on a fluorinated, microphase-separated comb copolymer. The film showed excellent performance in solid supercapacitors, outperforming conventional electrolytes. This innovative electrolyte film eliminates the need for separators, adhesives, or packaging processes in supercapacitor fabrication.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Multidisciplinary Sciences
Cindy Guanyu Tang, Mazlan Nur Syafiqah, Qi-Mian Koh, Mervin Chun-Yi Ang, Kim-Kian Choo, Ming-Ming Sun, Martin Callsen, Yuan-Ping Feng, Lay-Lay Chua, Rui-Qi Png, Peter K. H. Ho
Summary: In this study, the authors investigated the binding of water in monovalent conjugated polyelectrolytes using various techniques. They found that water is mainly bound at the interface between ion clusters and the hydrophobic matrix, establishing a model of surface hydration. The presence of water significantly affects the structure, dynamics, and properties of ion-containing soft matter.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Robert M. Pankow, Brendan Kerwin, Yongjoon Cho, Seonghun Jeong, Giacomo Forti, Bryan Musolino, Changduk Yang, Antonio Facchetti, Tobin J. Marks
Summary: A detailed investigation on the effects of functionalizing conjugated polymers with oligo(ethylene glycol) (EG(n)) sidechains on the performance and polymer-electrolyte compatibility of electrochromic devices (ECDs) is reported. The incorporation of EG(n) sidechains must be balanced to achieve good compatibility and efficient ion exchange. The characterization of the polymer film morphology/microstructure reveals that an excessive amount of EG(n) sidechains can suppress ion exchange. The identity of sidechain/electrolyte does not influence the electrolyte penetration depth, but EG(n) sidechain inclusion increases electrolyte cation uptake.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Electrochemistry
Michelle Cedeno Mata, Albert Orpella, Manuel Dominguez-Pumar, Sandra Bermejo
Summary: In this study, a novel mixture of ionic liquid gel polymer electrolyte (ILGPE) with Si@C and SiO2 embedded nanoparticles was fabricated. The addition of nanoparticles significantly improved the specific capacitance of the capacitors, enhancing ion transport pathways, ion dissociation in the electrolyte, and reducing the crystallinity of ILGPE. The findings contribute to a better understanding of the impact of nanoparticles on the Space-charge-limited-conduction (SCLC) mechanism and the related changes in transport mechanisms.
ELECTROCHIMICA ACTA
(2021)
Article
Polymer Science
Tsubasa Kobayashi, Ya-xin Li, Yuichiro Hirota, Asako Maekawa, Norikazu Nishiyama, Xiang-bing Zeng, Takahiro Ichikawa
Summary: The successful creation of all-solid polymer films with gyroid nanostructures, exhibiting high proton conductivity and low hydrogen gas permeability, provides a promising strategy for enhancing the performance of proton-exchange membrane fuel cells.
MACROMOLECULAR RAPID COMMUNICATIONS
(2021)
Article
Polymer Science
Gordon Pace, Oscar Nordness, Phong H. H. Nguyen, Yu-Jin Choi, Cassidy Tran, Raphaele J. Clement, Rachel A. A. Segalman
Summary: Tuning the interaction between polymers and ions is crucial for achieving a balance between ion solvation and transport in solid polymer electrolytes for batteries. In mixed lithium/electron-conducting systems, the design rules for electron and ion conducting polymers can seem contradictory. However, by functionalizing conjugated polymers with cationic side chains, a family of mixed-conducting polythiophenes has been developed that demonstrate high ionic and electronic conductivity. The strength of the ionic interactions and the physical structure of the side chains play important roles in lithium-selective transport and electronic conductivity, with the imidazolium group showing the best performance across all metrics.
Article
Polymer Science
Christo Novakov, Radostina Kalinova, Svetlana Veleva, Filip Ublekov, Ivaylo Dimitrov, Antonia Stoyanova
Summary: Mechanically and thermally stable gel polymer electrolytes (GPEs) were prepared and used in supercapacitor cells. Quasi-solid and flexible films were obtained by solution casting technique and immoblized with different states of ionic liquids(ILs). Crosslinking and stabilization agents were added for improved performance. The crosslinked films showed improved mechanical and thermal stability, as well as higher conductivity compared to non-crosslinked ones. The GPEs performed well as separator in symmetric and hybrid supercapacitor cells, promising for high-temperature solid-state supercapacitors.
Review
Chemistry, Multidisciplinary
Xiqi Zhang, Bo Song, Lei Jiang
Summary: Life systems exhibit ultralow energy consumption in energy conversion, information transmission, and biosynthesis. Achieving this requires ultralow-resistivity matter transport in nanochannels, with directional collective motion of ions or molecules. Photchemical reactions may drive high-efficiency biosynthesis. The macroscopic quantum state of ion channels could carry neural information.
ACCOUNTS OF CHEMICAL RESEARCH
(2022)
Article
Chemistry, Multidisciplinary
Glenn Quek, Brian Roehrich, Yude Su, Lior Sepunaru, Guillermo C. Bazan
Summary: Conjugated polyelectrolytes (CPEs), characterized by electronically delocalized backbones with ionic functionalities, are suitable for energy-storing pseudocapacitor devices. This perspective discusses the basis for evaluating pseudocapacitor figures of merit, the general utility and challenges of neutral conjugated polymers, and recent advances in the use of CPEs in pseudocapacitor devices.
ADVANCED MATERIALS
(2022)
Article
Engineering, Environmental
Xin Zheng, Chunjun Ni, Wenwen Xiao, Yuanyuan Liang, Yongjin Li
Summary: Ionic liquid grafted Polyethersulfone nanofibrous membranes (PES-g-IL NFMs) prepared by combining radiation induced grafting method and electrospinning strategy showed excellent adsorption ability for dyes and heavy metal ions, as well as great antibacterial capability, making them promising candidates for wastewater treatment.
CHEMICAL ENGINEERING JOURNAL
(2022)
Review
Chemistry, Multidisciplinary
Hee Jung Kim, Byeonggwan Kim, Yanghyun Auh, Eunkyoung Kim
Summary: Organic photothermal materials have garnered significant interest in the fields of photoenergy harvesting and thermal engineering due to their unique functions. Pi-conjugated organic PTMs, in particular, offer advantages in thin film applications with high light absorptivity, ease of synthesis, and tunability of molecular structures.
ADVANCED MATERIALS
(2021)
Article
Chemistry, Physical
Yan Xing, Xiaopeng Chen, Yujia Huang, Xiali Zhen, Lujun Wei, Xiqiang Zhong, Wei Pan
Summary: A 2D vermiculite film with thin thickness and naturally lamellar framework has been successfully prepared. This film exhibits excellent ionic conductivity and holds potential as a stable and low-cost candidate for high-performance solid electrolytes.
Article
Chemistry, Physical
Weijia Zhang, Shibing Zhen, Tao Ma, Tianjiang Sun, Zhanliang Tao
Summary: Polymerization is an effective strategy for solving the dissolution issue of organic electrode materials in aprotic electrolytes. In this study, a unique hollow tubular organic cathode material, T-PPh-PTO, was designed and synthesized, which exhibited excellent rate performance and cycle stability.
Article
Chemistry, Physical
Weijia Zhang, Shibing Zhen, Tao Ma, Tianjiang Sun, Zhanliang Tao
Summary: Polymerization is an effective strategy to solve the dissolution issue of organic electrode materials. In this study, a hollow tubular poly phenyl pyrene-4,5,9,10-tetraone (T-PPh-PTO) organic cathode material with a unique hollow structure was designed and synthesized based on the concentration-gradient of the precursor and asymmetrical internal diffusion. The T-PPh-PTO material exhibited a capacitance-dominated redox pseudocapacitance action with excellent rate performance and high cycle stability.
Article
Engineering, Chemical
Ngoc-Tram Le, James M. Myrick, Tara Seigle, Phong T. Huynh, Sitaraman Krishnan
ADVANCED POWDER TECHNOLOGY
(2018)
Article
Materials Science, Characterization & Testing
Monavareh Torabizadeh, Zackary A. Putnam, Malavarayan Sankarasubramanian, John C. Moosbrugger, Sitaraman Krishna
Article
Engineering, Chemical
Miao Luo, Zackary A. Putnam, Joseph Incavo, Ming Y. Huang, John B. McLaughlin, Sitaraman Krishnan
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2019)
Article
Engineering, Chemical
James M. Myrick, Venkat K. Vendra, Ngoc-Tram Le, Frederick A. Sexton, Sitaraman Krishnan
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2019)
Article
Materials Science, Characterization & Testing
Malavarayan Sankarasubramanian, Monavareh Torabizadeh, Zackary A. Putnam, John C. Moosbrugger, Ming Y. Huang, Sitaraman Krishnan
Editorial Material
Engineering, Chemical
Sitaraman Krishnan, Jose M. Asua, Mayuresh V. Kothare
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2019)
Article
Food Science & Technology
Thi-Van-Linh Nguyen, Phuoc-Bao-Duy Nguyen, Xuan-Cuong Luu, Bao-Long Huynh, Sitaraman Krishnan, Phong T. Huynh
JOURNAL OF FOOD PROCESSING AND PRESERVATION
(2019)
Article
Polymer Science
Janice L. Lebga-Nebane, Malavarayan Sankarasubramanian, Gregory Chojecki, Bo Ning, Philip A. Yuya, John C. Moosbrugger, Don H. Rasmussen, Sitaraman Krishnan
Summary: Composite powder coatings containing PEEK, hBN, and WC-CoCr particles were prepared and their mechanical and tribological properties were characterized using nanoindentation and sliding friction tests. The modulus, hardness, and plasticity index of the coatings showed different trends with varying compositions.
JOURNAL OF APPLIED POLYMER SCIENCE
(2021)
Article
Engineering, Chemical
Aswin Prathap Pitchiya, Ngoc-Tram Le, Zackary A. Putnam, Michael Harrington, Sitaraman Krishnan
Summary: Research was conducted on the use of porous graphite composites in proton-exchange membrane fuel cells and their effects on the properties of bipolar plates. By adjusting the content of graphite, polymer, and porogen, porous plates with high water uptake, high gas breakthrough pressure, electrical conductivity exceeding 100 S cm(-1), and flexural strength exceeding 25 MPa were obtained.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2021)
Article
Chemistry, Physical
Ramaswamy Venkatanarayanan, Janice L. Lebga-Nebane, Lin Wu, Sitaraman Krishnan
Summary: PEGylated imidazolium ionic liquids exhibit improved solvation of lithium salt compared to conventional alkylated ionic liquids, with Li+ showing increased affinity for PEG oxygen atoms as temperature rises. Diffusion coefficients in the linear MSD regime follow the trend [PEGmim](+) > [Tf2N](-) > Li+, with [PEGmim](+) having the highest diffusion coefficient. Mean square displacement profiles show equivalent ionic displacements for cations and anions in the absence of an electric field.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Engineering, Environmental
Gowri Mohandass, Weikun Chen, Sitaraman Krishnan, Taeyoung Kim
Summary: Electrochemical separation is an energy-efficient method for desalinating brackish water with the potential for energy storage. This study presents a new approach using redox flow batteries to achieve low-energy desalination and energy extraction from iron cyanide and iron citrate redox couples. The results demonstrate low energy consumption, high productivity, and high water recovery, making it a promising solution for brackish water desalination and addressing environmental challenges.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Electrochemistry
Gowri Mohandass, Sitaraman Krishnan, Taeyoung Kim
Summary: Researchers conducted experiments and modeling analysis to investigate the contribution of individual components to the cell voltage in the redox flow desalination (RFD) process, providing guidance for the rational design and operation of RFD processes.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2022)
Article
Chemistry, Multidisciplinary
Aswin Prathap Pitchiya, Benjamin Edward Slenker, Arvind Sreeram, Cody Johnson, Temitope Orimolade, Dipankar Roy, Sitaraman Krishnan
Summary: Dual-conducting polymer films were synthesized by dispersing graphene in an aqueous solution of poly(vinyl alcohol) and 1-propyl-3-methylimidazolium iodide ([C3mim]I) ionic liquid. The electrical and mechanical properties of the resulting films were analyzed, showing enhanced electronic conductivity and unexpected increase in ionic conductivity due to the interfacial effects of graphene on the free volume of the blend.
Article
Environmental Sciences
Ogechukwu Jude Igboke, Oludare Johnson Odejobi, Temitope Orimolade, Gavin H. H. Prevatt, Sitaraman Krishnan
Summary: Coconut shell biochar was sulfonated using sulfuric acid and used as a solid acid catalyst for corncob hydrolysis. The effects of carbonization temperature and sulfuric acid concentration on the biochar were studied. The sulfonated biochar showed improved acid density and catalytic activity compared to raw biochar.
WASTE AND BIOMASS VALORIZATION
(2023)
Article
Engineering, Environmental
Gowri Mohandass, Taeyoung Kim, Sitaraman Krishnan
Summary: A redox flow process for solar desalination of brackish water was developed, combining a redox flow desalination system with an aqueous dye-sensitized solar cell. The process demonstrated continuous freshwater production and highlighted the importance of DSSC photocurrent for increasing freshwater productivity in the solar RFD mode. Further improvements in water-compatible photoanodes and redox electrolytes could enhance the viability of solar RFD for water desalination.
ACS ES&T ENGINEERING
(2021)