名前を赤で表記しているメンバーは当研究室の学生・院生、青で表記しているメンバーは当研究室の教員です。
原著論文
- Tetsu Yonezawa and Hiroki Tsukamoto
Next Research, accepted for publication.【Elsevier】
【研究室内研究】
Abstract: - Yung-Chieh Liu, Dhanapal Vasu, Zhen-Yuan Lan, Kuan-Jun Ke, Bo-Han Chen, Wei Jian Sim, Te-Wei Chiu, Liangdong Fan, and Tetsu Yonezawa
Resourceful Hydrogen Generation through Methanol Steam Reforming Using Rare-Earth Metal Oxide-Modified Delafossite 3D Hollow Spheres
Langmuir, accepted for publication. 【ACS】（IF = 3.7）
DOI: 10.1021/acs.langmuir.4c04727 (Published (web) 5 February 2025)
【国際共同研究】
Abstract: The world is moving toward the goal of achieving net-zero carbon emissions by 2050, and hydrogen energy is considered an excellent alternative to nonrenewable energy sources. In this regard, developing a catalyst that is both economically valuable and exhibits efficient hydrogen production is a primary task at the current stage. This study utilized a hydrothermal synthesis method to prepare a nanosized 3-dimensional (3D) hollow sphere of CuCrO2–CeO2 for use in the Steam Reforming of Methanol (SRM) process. The characteristics and morphology of prepared CuCrO2–CeO2 hollow sphere were characterized by using various techniques such as XRD, FESEM, HRTEM, FTIR, Raman, etc. The CuCrO2–CeO2 hollow spheres with a 1:2 ratio exhibited the highest hydrogen production efficiency at 550 °C, yielding 6372.73 mL STP min–1 g cat–1 per gram of catalyst. Furthermore, the incorporation of CeO2 not only enhanced the hydrogen production rate of CuCrO2 but also extended the applicability of CuCrO2 nanoparticles to a wider temperature range. The unique 3D hollow sphere structure of the catalyst offers numerous advantages such as low cost, multiple catalytic reaction sites, and easy preparation. Therefore, CuCrO2–CeO2 hollow spheres hold potential for commercial development.
- Nichayanan Manyuan, Naoya Tanimoto, Kousuke Ueda, Ken Yamamoto, Tomoharu Tokunaga, Masaki Nishio, Tetsu Yonezawa, Hideya Kawasaki
“Ultrasonically Activated Liquid Metal Catalysts in Water for Enhanced Hydrogenation Efficiency”
ACS Applied Materials & Interfaces, 17(4), 6414-6427 (2025).【ACS】（IF = 8.5）
DOI: 10.1021/acsami.4c19936 (Published (web) 17 January 2025)
【国内共同研究】
Abstract: Hydride (H–) species on oxides have been extensively studied over the past few decades because of their critical role in various catalytic processes. Their syntheses require high temperatures and the presence of hydrogen, which involves complex equipment, high energy costs, and strict safety protocols. Hydride species tend to decompose in the presence of atmospheric oxygen and water, which reduces their catalytic activities. These challenges highlight the need for further research to improve the stability and efficiency of catalytic processes and develop safer and cost-effective synthesis methods. This paper introduces an ultrasonic fabrication method for gallium hydride species on liquid metal (LM) nanoparticles (Ga–H@LM NPs) in water and describes the evaluation of their catalytic properties. The Ga–H@LM NPs were synthesized by dispersing liquid metals of eutectic gallium–indium in water using a two-step ultrasonication process in an ice bath. The presence of Ga–H species was confirmed by Fourier-transform infrared spectroscopy. The Ga–H@LM NPs demonstrated the rapid catalytic hydrogenation of 4-nitrophenol and reductive degradation of azo dyes within minutes without the need for external reducing agents like NaBH4. The proposed mechanism involves high-energy ultrasonic cavitation at the interface between LM NPs and water, which promotes the formation of H2 from water and its activation to form Ga–H on particles surface during ultrasonication. This study has significant implications for advancing the field of catalysis because it provides a novel and efficient catalytic method for the synthesis of stable hydride species on gallium oxides.
- Mohan Gopalakrishnan, Myo Thandar Hlaing, Thirumoorthy Kulandaivel, Wathanyu Kao-ian, Mohammad Etesami, Wei-Ren Liu, Mai Thanh Nguyen, Tetsu Yonezawa, Wanwisa Limphirat, Soorathep Kheawhom
“Tunable N-doped Carbon Dots/SnO2 Interface as a Stable Artificial Solid Electrolyte Interphase for High-Performance Aqueous Zinc-Ion Batteries”
Journal of Alloys and Compounds, 1013, 178521 (2025). (pp.11)【Elsevier】（IF = 5.8）
DOI: 10.1016/j.jallcom.2025.178521 (Published (web) 8 January 2025)
【国際共同研究】
Abstract: Poor stability of zinc (Zn) anode hinders the use of aqueous zinc-ion batteries (AZIBs) for large-scale energy storage. Here, we report an effective artificial solid electrolyte interphase (ASEI) using N-doped carbon dots (CDs) and SnO2 to stabilize Zn anodes. By optimizing the CDs/SnO2 ratio, we can synthesize porous composites to construct “bayberry” and flower-like morphologies. The N-doped CDs/SnO2 anode creates surface dipoles and changes in charge distribution, allowing Zn ions to move to nitrogen functionalized sites with reduced adsorption barriers. Furthermore, hydroxyl oxygen boosts the surface’s hydrophilicity, resulting in stronger adhesion to the Zn anode and better ion accessibility. This generates dense nucleation sites for uniform Zn deposition. The CDs/SnO2@Zn electrode achieves a low nucleation potential of 47 mV and maintains 99.6% coulombic efficiency (CE) over 1000 cycles at 2 mA cm-2. In the symmetrical cells, the modified Zn anode exhibits stable cycling for 1,200 h at 1 mAh cm-2. A full cell with CDs/SnO2@Zn anode and MnO2 cathode retains 96.6% capacity after 800 h. This study introduces a promising strategy for stabilizing Zn anodes and offers valuable insights for designing dendrite-free electrodes in next-generation AZIBs.