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您的检索式：作者名="Beom Sik Youn"
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| 1 | Critical factors to inhibit water-splitting side reaction in carbon-based electrode materials for zinc metal anodes显示文摘Zinc metal anodes(ZMA)have high theoretical capacities(820 mAh g−1 and 5855 mAh cm−3)and redox potential(−0.76 V vs.standard hydrogen electrode),similar to the electrochemical voltage window of the hydrogen evolution reaction(HER)in a mild acidic electrolyte system,facilitating aqueous zinc batteries competitive in next-generation energy storage devices.However,the HER and byproduct formation effectuated by water-splitting deteriorate the electrochemical performance of ZMA,limiting their application.In this study,a key factor in promoting the HER in carbon-based electrode materials(CEMs),which can provide a larger active surface area and guide uniform zinc metal deposition,was investigated using a series of threedimensional structured templating carbon electrodes(3D-TCEs)with different local graphitic orderings,pore structures,and surface properties.The ultramicropores of CEMs are the determining critical factors in initiating HER and clogging active surfaces by Zn(OH)2 byproduct formation,through a systematic comparative study based on the 3D-TCE series samples.When the 3D-TCEs had a proper graphitic structure with few ultramicropores,they showed highly stable cycling performances over 2000 cycles with average Coulombic efficiencies of≥99%.These results suggest that a well-designed CEM can lead to high-performance ZMA in aqueous zinc batteries. | Dong Hyuk Kang Eunji Lee Beom Sik Youn Son Ha Jong Chan Hyun Juhee Yoon Dawon Jang Kyoung Sun Kim Hyungsub Kim Sang Moon Lee Sungho Lee Hyoung-Joon Jin Hyung-Kyu Lim Young Soo Yun | 2022 | Carbon Energy2022，4，6： | 0 |
| 2 | High-performance solid-solution potassium-ion intercalation mechanism of multilayered turbostratic graphene nanosheets显示文摘The solid-solution reaction between an alkali cation and an active host material is known as a singlephase redox mechanism,and it is typically accompanied by a continuous voltage change.It is distinct from the typical alkali cation intercalation reaction at an equivalent site of the active host material,which exhibits a voltage plateau.Herein,we report an unusual solid-solution potassium-ion intercalation mechanism with a low-voltage plateau capacity on multilayered turbostratic graphene nanosheets(T-GNSs).Despite the disordered graphitic structure with a broad range of d-spacings(3.65–4.18À),the T-GNSs showed a reversible plateau capacity of~200 m A h g^(-1),which is higher than that of a well-ordered graphite nanoplate(~120 m A h g^(-1)).In addition,a sloping capacity of~220 m A h g^(-1)was delivered with the plateau capacity,and higher rate capabilities,better reversibility,and a more stable cycling performance were confirmed on the turbostratic microstructure.First-principles calculations suggest that the multitudinous lattice domains of the T-GNSs contain diverse intercalation sites with strong binding energies,which could be the origin of the high-performance solid-solution potassium-ion intercalation behavior when the turbostratic graphene stacks have a d-spacing smaller than that of equilibrium potassium–graphite intercalation compounds(5.35À). | Jiae Um Seung Uk Yoon Hoseong Kim Beom Sik Youn Hyoung-Joon Jin Hyung-Kyu Lim Young Soo Yun | 2022 | Journal of Energy Chemistry2022，31，4： | 0 |
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