04/11專題演講公告

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上層分類：系所公告

分類：演講

建立於 2016-04-06, 週三 15:53

最近更新於 2016-04-06, 週三 16:03

發佈於：-0001-11-30, 週三 08:00

點擊數：2330

演講人：胡啟章 博士

演講題目：Designing Graphene-Based Electrode Materials for Electrochemical Applications

 

演講人：胡啟章 博士

服務單位：清華大學化工系

演講題目：Designing Graphene-Based Electrode Materials for Electrochemical Applications

演講時間：105.04.11 10:20~12:10

演講地點：工綜館203室

 

 

演講摘要：

This talk will give a brief review on supercapacitors and the preparation, characterization, and applications of graphene sheets. After this introduction, 2 examples for synthesis, characterization, and supercapacitor applications of graphene-based materials will be given.

 

Stacking of individual reduced graphene oxide (RGO) is effectively inhibited by introducing one-dimensional carbon nanotubes to form a 3-D hierarchical structure which enhances the utilization of RGO-based composites. CNTs are useful nanospacers for diminishing the face-to-face aggregation of RGO and enlarging the spacebetween RGO sheets, leading to obtain a highly porous nanostructure. The specific capacitance of RGO-CNT-9-1 (326 F/g at 20 mV/s) is much higher than that of RGO (83 F/g). The energy and power densities of RGO-CNT-9-1 are respectively as high as 21.74 Wh/kgand 78.29 kW/kg, revealing that the hierarchical RGO-CNT architecture provides remarkableeffects on enhancing the capacitive performance of RGO-based composites.

 

Crystalline hausmannite nanocrystals/reduced graphene oxide composites (denoted as Mn₃O₄/RGO) are synthesized by the microwave-assisted hydrothermal synthesis route for the application of supercapacitors. Effects of the Mn₃O₄ content on the microstructure and electrochemical performances of nanocomposites are systematically examined by scanning electron microscopic and X-ray diffraction (XRD) analyses. The results indicate that the composite with about 82.4 wt% Mn₃O₄ (denoted as GMn80) shows the largest total specific capacitance (193 F/g), which is employed for the tests of supercapacitors of both symmetric and asymmetric types. An aqueous asymmetric supercapacitor, consisting of a GMn80 cathode and an N-doped RGO anode, with a cell voltage of 2 V is demonstrated in this work, which shows the device energy and power densities of 11.11 Wh/kg and 23.5 kW/kg, respectively.

 

個人學經歷：

 

學歷

 

畢業學校	國別	主修學門系所	學位
成功大學	台灣	化學工程學系	化工博士(1995)
成功大學	台灣	化學工程學系	化工碩士(1992肄)
成功大學	台灣	化學工程學系	化工學士1991

 

經歷：

 

服務機關	服務部門	職稱
現職:
清華大學	化學工程系	講座教授
利物浦大學	工程學院	名譽客座教授
經歷:
清華大學	化學工程系	特聘教授
清華大學	化學工程系	教授
中正大學	化學工程系	教授
中正大學	化學工程系	副教授
中正大學	化學工程系	助理教授