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제125회 대한화학회 학술발표회 및 총회 Fine-Control of the Defect and Stacking Structure of Inorganic Nanosheets for Optimizing Their Electrode and Electrocatalyst Performances

2020년 2월 12일 19시 04분 28초
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Material Chemistry
저자 및
Tae-Ha Gu, Xiaoyan Jin1, Seong-Ju Hwang1,*
Department of Chemistry and Nanoscience, Ewha Womans University, Korea
1Department of Materials Science and Engineering, Yonsei University, Korea
An effective chemical way to optimize the electrochemical functionalities of layered inorganic solids is developed by controlled restacking of exfoliated 2D nanosheet (NS). The fine-control of the stacking number and oxygen defect of restacked inorganic NSs with positive layer charge can be achieved by employing diverse anions as intercalants which have various ionic sizes and charge densities. In contrast to conventional expectation, the supercapacitor electrode and electrocatalyst performances of inorganic NSs are well-correlated with their stacking numbers and oxygen defects, rather than with their basal spacings. The application of intercalant ion with low charge density is quite effective in enhancing the electrode/electrocatalyst performances of restacked layered double hydroxide (LDH) NSs via the creation of oxygen defect and the decrease of stacking number, resulting in improvement of catalysis kinetics and charge transfer property, and electrochemical surface area (ECSA). The present study highlights that the controlled restacking of exfoliated inorganic NSs with intercalant ions can provide an effective way to optimize its electrochemical functionalities.