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: |
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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 |