Article
Chemistry, Physical
Oliver Nolte, Philip Rohland, Nico Ueberschaar, Martin D. Hager, Ulrich S. Schubert
Summary: This study investigates the fade rate of N,N,N-2,2,6,6-heptamethylpiperidinyloxy-4-ammonium chloride (TMA-TEMPO) in correlation with temperature and time through battery experiments. The main cause of capacity decay is the deactivation of the oxidized TMA-TEMPO. The results provide insights for the development of a use-oriented cycling program.
JOURNAL OF POWER SOURCES
(2022)
Article
Chemistry, Multidisciplinary
Didjay F. Bruggeman, Annechien A. H. Laporte, Remko J. Detz, Simon Mathew, Joost N. H. Reek
Summary: This study reports a dye-sensitized photoelectrochemical cell that is capable of oxidizing glycerol and producing hydrogen. The use of a redox-gel layer with a high potential dye-sensitized mesoporous TiO2 photoanode protects the photoanode from degradation and significantly improves the conversion rate of glycerol. The redox-gel protected photoanode also demonstrates stable photocurrent over extended periods of continuous operation.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Chemistry, Physical
Bo Hu, Maowei Hu, Jian Luo, T. Leo Liu
Summary: This study presents a new TEMPO derivative as a catholyte material for AORFBs, characterized by ultra-low permeability and exceptional stability. Paired with a specific anolyte material, it achieves high power density and excellent capacity retention.
ADVANCED ENERGY MATERIALS
(2022)
Article
Energy & Fuels
Balasubramanian Karuppasamy, Balusamy Shenbagabalakrishnan, Venkatachari Gayathri
Summary: The photovoltaic performance of aqueous Al-ion electrolyte-based dye-sensitized solar cells was investigated, showing an efficiency 50% higher than the quoted value and an 80% enhancement with antimony-doped tin oxide compared to undoped tin oxide.
Article
Chemistry, Physical
Shanmuganathan Venkatesan, Nguyen Huong Tra My, Hsisheng Teng, Yuh-Lang Lee
Summary: Thin films of solid-state polymer electrolytes (SSPEs) have been developed for dye-sensitized solar cells (DSCs) for the first time. Gel-electrolytes are prepared by utilizing a blend of poly(ethylene oxide) (PEO)/polyethylene glycol (PEG) and an acetonitrile-based iodide liquid electrolyte, and then cast onto a glass substrate to fabricate solvent-free SSPEs by evaporating the solvent. The SSPE films are sandwiched between photoelectrodes and counter electrodes to assemble the solid-state DSCs, and the PCE can be improved by introducing TiO2 nanofillers in the SSPEs. The high stability of the solid-state DSCs is demonstrated with a retention of 98% of their original efficiency after a 700-hour test period.
JOURNAL OF POWER SOURCES
(2023)
Article
Chemistry, Physical
Ambarish Kumar Singh, Jayaraj Nithyanandhan
Summary: The study explored a series of amphiphilic indoline-based unsymmetrical squaraine dyes, where alkyl groups and glycolic chain were systematically modified to control self-assembly and improve interfacial properties. In nonaqueous DSSCs, increasing the number of carbon atoms in alkyl groups enhanced photovoltaic efficiencies. Addition of chenodeoxycholic acid improved efficiency, while increased carbon atoms in the alkyl groups had a detrimental effect on aqueous DSSC efficiency.
ACS APPLIED ENERGY MATERIALS
(2021)
Review
Chemistry, Multidisciplinary
Zhemin Li, Qizhao Li, Chengjie Li, Yongshu Xie
Summary: Dye-sensitized solar cells (DSSCs) have the advantages of environmental friendliness, easy fabrication, and rich colors, making them promising for applications in architectural decoration and power supply for low energy devices. However, porphyrin dyes used in DSSCs still suffer from absorption defects and aggregation tendencies. In order to address these issues, various approaches have been developed to achieve panchromatic absorption and high efficiency.
MATERIALS CHEMISTRY FRONTIERS
(2023)
Article
Chemistry, Physical
Fatima Santos, Jorge Martins, Jeffrey Capitao, Seyedali Emami, Dzmitry Ivanou, Adelio Mendes
Summary: Dye-sensitized solar cells (DSSCs) are a promising technology for wireless powering of low-consuming electronics and sensor nodes of the internet of things (IoT). This study achieved highly stable cobalt-mediated monolithic DSSCs through encapsulation using a glass-frit sealant, eliminating extrinsic degradation factors.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Chemistry, Physical
Meghry Jilakian, Tarek H. Ghaddar
Summary: This paper presents an eco-friendly dye-sensitized solar cell (DSC) based on an aqueous electrolyte system, using a water-soluble polypyridyl copper complex as the redox couple. By coupling with a ruthenium-based dye, C106, a high photo-conversion efficiency of around 7% has been achieved under ambient light conditions. This opens up possibilities for the development of eco-friendly water-based DSCs.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Guillaume Bousrez, Olivier Renier, Brando Adranno, Volodymyr Smetana, Anja-Verena Mudring
Summary: The study found that 1,3-dialkyltriazolium iodides exhibit high chemical and thermal stability, with significant changes in electrolyte properties upon addition of different iodine content, where iodine addition usually leads to a decrease in melting point and an increase in conductivity. Compared to imidazolium iodides, triazolium compounds show higher efficiency and longer battery life, possibly due to their non-hygroscopic nature.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2021)
Article
Chemistry, Multidisciplinary
Pyeongje An, Jae Ho Kim, Myeonghwan Shin, Sukyeong Kim, Sungok Cho, Chaehyun Park, Geonguk Kim, Hyung Woo Lee, Jin Woo Choi, Chuljin Ahn, Myungkwan Song
Summary: Fiber-shaped dye-sensitized solar cells (FDSSCs) with flexibility, weavability, and wearability have gained significant interest due to their low cost, simple fabrication, and environmentally friendly operation. Research has shown that solid-state electrolytes based on 4-Oxo TEMPO can significantly improve the power conversion efficiency (PCE) of solar cells. The optimized solid-state FDSSC exhibited a PCE of 6%, a 34.2% improvement compared to the reference device.
Article
Engineering, Environmental
Ding Lu, Chunjian Xu, Yan Wang, Wangfeng Cai
Summary: Redox flow desalination using NaSO4-TEMPO shows high salt removal rate and charge efficiency at high operating voltages. The concentration of NaSO4-TEMPO and the concentration of NaCl both affect the desalination performance. The study aims to develop a safe and low-cost total-organic redox desalination system.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Physical
Fatima Santos, Carolina Hora, Dzmitry Ivanou, Adelio M. Mendes
Summary: Due to their high power conversion efficiency under indoor light, dye-sensitized solar cells (DSSCs) are considered a promising energy technology for future IoT devices and wireless sensors. Monolithic design DSSCs offer advantages in commercial production, such as straightforward processing, low cost, and compactness.
ACS APPLIED ENERGY MATERIALS
(2021)
Article
Chemistry, Physical
Mingguang Pan, Liuzhou Gao, Junchuan Liang, Pengbo Zhang, Shuyu Lu, Yan Lu, Jing Ma, Zhong Jin
Summary: This study reports a highly-soluble organic redox pair that exhibits high cell voltage and long cycling life in aqueous organic redox flow batteries. The study also reveals the interaction between the redox-active species and water, as well as the capacity degradation mechanism of the battery system.
ADVANCED ENERGY MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Liwen Wang, Mingbao Huang, Kai Wan, Zhiyong Fu, Zhipeng Xiang, Zhenxing Liang
Summary: This study develops a highly soluble bipolar redox-active organic molecule by covalently coupling the TEMPO and viologen moieties, which effectively improves the stability and capacity decay issue in flow batteries.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Makoto Yonenaga, Yusuke Kaiwa, Kouki Oka, Kenichi Oyaizu, Kenji Miyatake
Summary: A proof-of-concept study was conducted on an all-solid-state rechargeable air battery using redox-active 2,5-dihydroxy-1,4-benzoquinone (DHBQ), its polymer (PDBM) and a proton-conductive polymer (Nafion). The battery showed good performance with DHBQ in the redox reaction at 0.47 and 0.57 V vs. RHE, similar to that in acid aqueous solution. The discharge capacity was significantly improved with the use of PDBM due to the enhanced utilization of the redox-active moieties.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Multidisciplinary Sciences
Kan Hatakeyama-Sato, Karin Sadakuni, Kan Kitagawa, Kenichi Oyaizu
Summary: Redox targeting reaction is an emerging idea for boosting the energy density of redox-flow batteries. This study reports the development of 4 V-class organic polymer mediators using thianthrene derivatives, which have higher potentials compared to conventional organic mediators. The successful mediation cycles observed in this study indicate the potential for designing particle-based redox targeting systems with porous separators for higher energy density and lower cost.
SCIENTIFIC REPORTS
(2023)
Article
Green & Sustainable Science & Technology
Jin-Chieh Ho, Kan Hatakeyama-Sato, Akinari Chiba, Masaki Hayashi, Yuto Igarashi, Kenichi Oyaizu, Wen-Chang Chen
Summary: In the past decade, there has been gradual development in fully stretchable semiconductors. However, the complex cell configurations have hindered the development of stretchable batteries. To overcome this, a fully stretch-rechargeable battery with a sandwich configuration is fabricated. This study is expected to open up new horizons for e-skin and stretchable electronic fields.
ADVANCED SUSTAINABLE SYSTEMS
(2023)
Article
Materials Science, Multidisciplinary
Seigo Watanabe, Hiromichi Nishio, Teru Takayama, Kenichi Oyaizu
Summary: Dihydroxy-substituted poly(phenylene sulfide) (DOHPPS) was synthesized by oxidative polymerization of bis(2,6-dimethoxyphenyl) disulfide and subsequent deprotection. The polymer exhibited visible transparency and an ultrahigh refractive index (nD = 1.85) due to the synergistic effect of multiple-hydrogen-bond cross-links and the rigidity of the thiophenylene backbone.
ACS APPLIED POLYMER MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Megumi Kojima, Lyufei Xue, Kenichi Oyaizu, Hiroyuki Nishide, Takeo Suga
Summary: Due to their high power conversion efficiencies, all-perovskite tandem solar cells, with an inorganic CsPbI2Br perovskite as the front photovoltaic cell, have attracted significant attention recently. A dopant-free poly-(3-butylthiophene) has been identified as an effective hole-extracting and -transporting material on the inorganic perovskite layer compared to conventional poly-(3-hexyl- and -octyl-thiophene)-s. Surface passivation of the perovskite layer using alkyl ammonium bromide, particularly butyl-one, has further improved the efficiency and durability. This study focuses on the matching of alkyl chain lengths for poly-(3-alkylthiophene) and alkyl ammonium salt at the interface of the hole-extracting and passivated perovskite layers.
ACS APPLIED POLYMER MATERIALS
(2023)
Review
Chemistry, Multidisciplinary
Kan Hatakeyama-Sato, Kenichi Oyaizu
Summary: Persistent radicals possess unique molecular properties, such as open-shell structures and fast reversible redox reactions. Electrochemical aspects of persistent radicals, including redox potentials, bistability, and kinetic constants for electrode reactions and electron self-exchange reactions, are discussed. Radical polymers with accumulated redox sites exhibit distinct charge transport and storage properties. Persistent radical molecules have great potential for various electrochemical applications.
Article
Chemistry, Multidisciplinary
Kan Hatakeyama-Sato, Yasuei Uchima, Takahiro Kashikawa, Koichi Kimura, Kenichi Oyaizu
Summary: Data-driven optimal structure exploration is a popular topic in materials for energy-related devices. However, the accuracy of material property prediction and the vast exploration space for candidate structures pose challenges. We propose a data trend analysis system for materials using quantum-inspired annealing, which combines decision tree and quadratic regression algorithms to learn structure-property relationships. The system explores ideal solutions to maximize properties using a Fujitsu Digital Annealer, a unique hardware that extracts promising solutions from the search space. Experimental validation on solid polymer electrolytes for solid-state lithium-ion batteries demonstrates the system's effectiveness, with a new trithiocarbonate polymer electrolyte offering high conductivity even in a glassy state. Molecular design through data science enables accelerated exploration of functional materials for energy-related devices.
Article
Polymer Science
Kouki Oka, Yusuke Kaiwa, Kazuki Kobayashi, Yuka Tobita, Kenichi Oyaizu
Summary: A new quaternized polymer was synthesized by introducing butanediol into poly(allylamine) and converting the remaining amino groups into quaternary ammonium cations. The hydrophilicity and electrostatic repulsion of the polymer accelerated the dehydrogenation of butanediol. The reaction rate was one order of magnitude higher than that in single molecules.
Article
Chemistry, Multidisciplinary
Kan Hatakeyama-Sato, Yasuhiko Igarashi, Takahiro Kashikawa, Koichi Kimura, Kenichi Oyaizu
Summary: QCL is an emerging regression algorithm based on the rules of quantum mechanics, suitable for data processing in chemo- and materials-informatics. It can handle linear and non-linear functions on small datasets and outperform conventional algorithms in prediction accuracy.
Article
Chemistry, Multidisciplinary
Kan Hatakeyama-Sato, Seigo Watanabe, Naoki Yamane, Yasuhiko Igarashi, Kenichi Oyaizu
Summary: Materials informatics and cheminformatics face challenges due to data scarcity, hindering the study of structure-property relationships. We propose using GPT-4 language model to select explanatory variables and address the issues caused by data scarcity and the Ugly Duckling theorem.
Article
Chemistry, Multidisciplinary
Seigo Watanabe, Hiromichi Nishio, Kenichi Oyaizu
Summary: This paper reports a facile synthesis method for telechelic poly(phenylene sulfide)s through the Friedel-Crafts type electrophilic substitution of the poly(phenylene sulfide) precursors and the halogenated electron-deficient aromatic sulfonium cation.
Article
Polymer Science
Seigo Watanabe, Teru Takayama, Kenichi Oyaizu
Summary: Researchers have discovered that poly(phenylene sulfide) derivatives exhibit a balanced combination of ultrahigh refractive index and Abbe number due to the synergistic effect of high molar refraction and dense intermolecular hydrogen bonds. This new strategy is expected to contribute to the development of high-refractive-index polymers with refractive indices and Abbe numbers beyond the existing threshold.
Article
Electrochemistry
Kan Hatakeyama-Sato, Choitsu Go, Tomoki Akahane, Takahiro Kaseyama, Takuji Yoshimoto, Kenichi Oyaizu
Summary: Quadruply fused aromatic heterocycles are investigated as 4 V-class organic cathode-active materials. The newly synthesized substituted polymer exhibits reversible charge/discharge behavior at high potentials and maintains a long cycle life. The structure of the polymer and the radical spin configuration in the heterocycles are crucial for enhancing voltage and cycle life.
BATTERIES & SUPERCAPS
(2022)
Article
Polymer Science
Seigo Watanabe, Teru Takayama, Hiromichi Nishio, Kanta Matsushima, Yoko Tanaka, Seiya Saito, Yushun Sun, Kenichi Oyaizu
Summary: Highly refractive, thermostable, and transparent poly(phenylene sulfide) derivatives partially including S=O bonds were prepared and exhibited improved transparency and glass-transition temperature while maintaining a high refractive index.
Article
Materials Science, Multidisciplinary
Kouki Oka, Miho Kataoka, Hiroyuki Nishide, Kenichi Oyaizu
Summary: This study proposes a polymeric hydrogen carrier with 2,3-diphenylquinoxaline as a hydrogen storage unit, which achieves rapid dehydrogenation through the introduction of phenyl group. The researchers successfully synthesized polymers with high molecular weight and demonstrated their reversible hydrogenation/dehydrogenation ability.
MRS COMMUNICATIONS
(2022)
