HOME > Profile > SHRESTHA, Lok Kumar
- Address
- 305-0044 1-1 Namiki Tsukuba Ibaraki JAPAN [Access]
Accepting Students
Research
PublicationsNIMS affiliated publications since 2004.
Research papers
- Lok Kumar Shrestha, Rekha Goswami Shrestha, Sabina Shahi, Chhabi Lal Gnawali, Mandira Pradhananga Adhikari, Biswa Nath Bhadra, Katsuhiko Ariga. Biomass Nanoarchitectonics for Supercapacitor Applications. Journal of Oleo Science. 72 [1] (2023) ess22377 10.5650/jos.ess22377 Open Access
- Jonathan P. Hill, Rekha Goswami Shrestha, Jingwen Song, Qingmin Ji, Katsuhiko Ariga, Lok Kumar Shrestha. Monitoring the Release of Silver from a Supramolecular Fullerene C60-AgNO3 Nanomaterial. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN. (2021) 1347-1354
- Olga Guselnikova, Andrii Trelin, Yunqing Kang, Pavel Postnikov, Makoto Kobashi, Asuka Suzuki, Lok Kumar Shrestha, Joel Henzie, Yusuke Yamauchi. Pretreatment-free SERS sensing of microplastics using a self-attention-based neural network on hierarchically porous Ag foams. Nature Communications. 15 [1] (2024) 4351 10.1038/s41467-024-48148-w Open Access
Books
- SHRESTHA, Lok Kumar, Kenji Aramaki. Non-aqueous Foams: Formation and Stability. Foam Engineering: Fundamentals and Applications. , 2012, 169-206.
Presentations
- SHRESTHA, Lok Kumar. Hierarchically Porous Carbon Materials from Self-Assembled Fullerene Crystals for Energy Storage Applications. International Conference on Advanced Functional Materials 2024 Kathmandu (ICAFM 2024) . 2024 Invited
- SHRESTHA, Lok Kumar. Supramolecular Self-Assembly of Fullerenes from Zero-to-Higher Dimensions. Soft Interface Seminar XLII. 2024 Invited
- SHRESTHA, Lok Kumar. Supramolecular Self-Assembly of Fullerene and Derived Hierarchically Porous Carbon Materials for Energy Storage Applications. International Conference on Nanotechnology and Smart Materials (Smart Nano-2024). 2024 Invited
Misc
- SHRESTHA, Lok Kumar, ARIGA, Katsuhiko. Bio-Related Applications of Fullerene Nanowhiskers and Related Assemblies: Cell Culture, Sensing and Supramolecular Differentiation. Fullerene Nanowhiskers. (2019) 233-246
- SHRESTHA, Lok Kumar, ARIGA, Katsuhiko. Fullerene Nanoarchitectonics for One-Dimensional Nanostructures and Their Array. Nanostructured Materials: Synthesis, Properties and Applications. (2019) 293-303
- 有賀 克彦, スレスタ ロック クマール. フラーレンナノアーキテクトニクス：ゼロ次元からの多彩な自己組織化構造. オレオサイエンス. (2021) 221-225
Published patent applications
Society memberships
日本化学会, The Asian Society for Colloid and Surface Science (ASCASS)
Research Center for Materials Nanoarchitectonics (MANA)
フラーレンベースの新しいナノ多孔質炭素材料の設計
自己組織化，機能性材料，センシング，エネルギー貯蔵，エネルギー変換，生物学的応用
Overview
Fullerenes (C60 or C70) are zero-dimensional functional molecules that undergo supramolecular self-assembly due to their high symmetries and extended π-conjugated systems and form various shape-controlled micro- or nanosized crystalline objects. In NIMS, we have developed method to directly convert these highly crystalline π-electron-rich fullerene nanomaterials into hierarchically porous graphitic carbon materials with high surface area and interconnected pore structures by high-temperature carbonization, which have significant potential as electrode materials in state-or-art electrochemical energy storage supercapacitors.
Novelty and originality
Porous carbon materials obtained from fullerene crystals exhibit a unified shape and size followed by superior electrochemical energy storage performance over conventional carbon materials because of their large surface areas, improved electrical conductivities, well-defined pore size distributions, and hierarchical and interconnected pore architectures.
Details
We have recently demonstrated novel hollow carbon spheres with hierarchically porous architectures by high-temperature carbonization of self-assembled fullerene-ethylenediamine hollow spheres (FE-HS). FE-HS were prepared by using a dynamic liquid-liquid interfacial precipitation (DLLIP) method at ambient conditions of temperature and pressure. High temperature carbonization (at 700, 900, and 1100 °C) of the FE-HS yielded nanoporous (micro/mesoporous) hollow carbon spheres with large surface areas (612 to 1616 m2 g-1) and large pore volumes (0.925 to 1.346 cm3 g-1) dependent on temperature applied. The sample obtained by carbonization of FE-HS at 900 °C (FE-HS_900) displayed optimum surface area and exhibited remarkable electrochemical electrical double-layer capacitance properties in aq. 1 M sulfuric acid due to its well-developed porosity, interconnected pore structure, and large surface area. The symmetric supercapacitor cell assembled using FE-HS_900 attained 164 F g-1 at 1 A g-1 with sustained 50% capacitance at 10 A g-1accompanied by 96% cycle life and 98% coulombic efficiency after 10,000 consecutive charge/discharge cycles.
Summary
Thermal annealing processes disrupt the fullerenes carbon-only skeleton contained within the self-assembled structures, maintaining the basic morphology of the starting material, accompanied by surface roughening and the emergence of a high porosity carbon network essential to enhance the energy storage, conversion, and sensing performance.
