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17 results on '"Kim, Min-Gyu"'

2. Insight into Controllable Metal–Support Interactions in Metal/Metal Electrocatalysts for Efficient Energy-Saving Hydrogen Production

Author

Liu, Yang, primary, Li, Hao, additional, Liu, Xinghui, additional, Wang, Yixuan, additional, Wang, Lingling, additional, Yang, Taehun, additional, Jadhav, Amol R., additional, Zhang, Jinqiang, additional, Wang, Yang, additional, Wu, Mingbo, additional, Lee, Jin Yong, additional, Kim, Min Gyu, additional, and Lee, Hyoyoung, additional

Published
2023
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7. Efficient Nitrate Conversion to Ammonia on f-Block Single-Atom/Metal Oxide Heterostructure via Local Electron-Deficiency Modulation

Author

Kumar, Ashwani, primary, Lee, Jinsun, additional, Kim, Min Gyu, additional, Debnath, Bharati, additional, Liu, Xinghui, additional, Hwang, Yosep, additional, Wang, Yue, additional, Shao, Xiaodong, additional, Jadhav, Amol R., additional, Liu, Yang, additional, Tüysüz, Harun, additional, and Lee, Hyoyoung, additional

Published
2022
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9. Unraveling the Synergy of Chemical Hydroxylation and the Physical Heterointerface upon Improving the Hydrogen Evolution Kinetics

Author

Liu, Yang, primary, Liu, Xinghui, additional, Wang, Xiaoshan, additional, Ning, Hui, additional, Yang, Taehun, additional, Yu, Jianmin, additional, Kumar, Ashwani, additional, Luo, Yongguang, additional, Wang, Hongdan, additional, Wang, Lingling, additional, Lee, Jinsun, additional, Jadhav, Amol R., additional, Hu, Han, additional, Wu, Mingbo, additional, Kim, Min Gyu, additional, and Lee, Hyoyoung, additional

Published
2021
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12. Efficient Nitrate Conversion to Ammonia on f-Block Single-Atom/Metal Oxide Heterostructure viaLocal Electron-Deficiency Modulation

Author

Kumar, Ashwani, Lee, Jinsun, Kim, Min Gyu, Debnath, Bharati, Liu, Xinghui, Hwang, Yosep, Wang, Yue, Shao, Xiaodong, Jadhav, Amol R., Liu, Yang, Tüysüz, Harun, and Lee, Hyoyoung

Abstract

Exploring single-atom catalysts (SACs) for the nitrate reduction reaction (NO3–; NitRR) to value-added ammonia (NH3) offers a sustainable alternative to both the Haber–Bosch process and NO3–-rich wastewater treatment. However, due to the insufficient electron deficiency and unfavorable electronic structure of SACs, resulting in poor NO3–-adsorption, sluggish proton (H*) transfer kinetics, and preferred hydrogen evolution, their NO3–-to-NH3selectivity and yield rate are far from satisfactory. Herein, a systematic theoretical prediction reveals that the local electron deficiency of an f-block Gd single atom (GdSA) can be significantly regulated upon coordination with oxygen-defect-rich NiO (GdSA-D-NiO400) support. Thus, facilitating stronger NO3–adsorption viastrong Gd5d–O2porbital coupling and further improving the protonation kinetics of adsorption intermediates by rapid H* capture from water dissociation catalyzed by the adjacent oxygen vacancy site along with suppressed H* dimerization synergistically boosts the NH3selectivity/yield rate. Motivated by DFT prediction, we delicately stabilized electron-deficient (strongly electrophilic) GdSAon D-NiO400(∼84% strong electrophilic sites), which exhibited excellent alkaline NitRR activity (NH3Faradaic efficiency ∼97% and yield rate ∼628 μg/(mgcath)) along with superior structural stability, as revealed by in situRaman spectroscopy, significantly outperforming weakly electrophilic Gd nanoparticles, defect-free GdSA-P-NiO400, and reported state-of-the-art catalysts.

Published
2022
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16. Cost-Effective Scalable Synthesis of Mesoporous Germanium Particles viaa Redox-Transmetalation Reaction for High-Performance Energy Storage Devices

Author

Choi, Sinho, Kim, Jieun, Choi, Nam-Soon, Kim, Min Gyu, and Park, Soojin

Abstract

Nanostructured germanium is a promising material for high-performance energy storage devices. However, synthesizing it in a cost-effective and simple manner on a large scale remains a significant challenge. Herein, we report a redox-transmetalation reaction-based route for the large-scale synthesis of mesoporous germanium particles from germanium oxide at temperatures of 420–600 °C. We could confirm that a unique redox-transmetalation reaction occurs between Zn0and Ge4+at approximately 420 °C using temperature-dependent in situX-ray absorption fine structure analysis. This reaction has several advantages, which include (i) the successful synthesis of germanium particles at a low temperature (∼450 °C), (ii) the accommodation of large volume changes, owing to the mesoporous structure of the germanium particles, and (iii) the ability to synthesize the particles in a cost-effective and scalable manner, as inexpensive metal oxides are used as the starting materials. The optimized mesoporous germanium anode exhibits a reversible capacity of ∼1400 mA h g–1after 300 cycles at a rate of 0.5 C (corresponding to the capacity retention of 99.5%), as well as stable cycling in a full cell containing a LiCoO2cathode with a high energy density (charge capacity = 286.62 mA h cm–3).

Published
2015
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17. Atomically Thin Holey Two-Dimensional Ru 2 P Nanosheets for Enhanced Hydrogen Evolution Electrocatalysis.

Author

Jin X, Jang H, Jarulertwathana N, Kim MG, and Hwang SJ

Abstract

The defect engineering of low-dimensional nanostructured materials has led to increased scientific efforts owing to their high efficiency concerning high-performance electrocatalysts that play a crucial role in renewable energy technologies. Herein, we report an efficient methodology for fabricating atomically thin, holey metal-phosphide nanosheets with excellent electrocatalyst functionality. Two-dimensional, subnanometer-thick, holey Ru 2 P nanosheets containing crystal defects were synthesized via the phosphidation of monolayer RuO 2 nanosheets. Holey Ru 2 P nanosheets exhibited superior electrocatalytic activity for the hydrogen evolution reaction (HER) compared to that exhibited by nonholey Ru 2 P nanoparticles. Further, holey Ru 2 P nanosheets exhibited overpotentials of 17 and 26 mV in acidic and alkaline electrolytes, respectively. Thus, they are among the best-performing Ru-P-based HER catalysts reported to date. In situ spectroscopic investigations indicated that the holey nanosheet morphology enhanced the accumulation of surface hydrogen through the adsorption of protons and/or water, resulting in an increased contribution of the Volmer-Tafel mechanism toward the exceptional HER activity of these ultrathin electrocatalysts.

Published
2022
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