Synergistic-effect-controlled CoTe2/carbon nanotube hybrid material for efficient water oxidation
學年 105
學期 1
出版(發表)日期 2016-11-10
作品名稱 Synergistic-effect-controlled CoTe2/carbon nanotube hybrid material for efficient water oxidation
作品名稱(其他語言)
著者 Tzu-Hsiang Lu;Chih-Jung Chen;Ying-Rui Lu;Chung-Li Dong;Ru-Shi Liu
單位
出版者
著錄名稱、卷期、頁數 The Journal of Physical Chemistry C 120(49), p.28093–28099
摘要 In anode, electrocatalytic water splitting involves oxygen evolution reaction (OER), which is a complex and sluggish reaction, and thus the efficiency to produce hydrogen is seriously limited by OER. We report that CoTe2 exhibits optimized OER activity for the first time. Multiwalled carbon nanotube (MWCNT) is utilized to support CoTe2 in generating a synergistic effect to enhance OER activity and improve stability by tuning different loading amounts of CoTe2 on CNT. In 1.0 M KOH, bare CoTe2 needed overpotential of 323 mV to produce 10 mA/ cm2 with Tafel slope of 85.1 mV/dec, but CoTe2/carbon nanotube (CNT) with optimized loading amount of CoTe2 required only 291 mV to produce10 mA/cm2 with Tafel slope of 44.2 mV/dec. X-ray absorption near edge structure (XANES) was applied to prove that an electron transfer from eg band of CoTe2 to CNT caused a synergistic effect. This electron transfer modulated the bond strength of oxygen-related intermediate species on the surface of catalyst and optimized OER performance. In situ XANES was used to compare CoTe2/CNT and pristine CoTe2 during OER. It proved the transition state of CoOOH more easily existed by adding CNT in hybrid material during OER to enhance the efficiency of OER. Moreover, bare CoTe2 is unstable under OER, but the CoTe2/CNT hybrid materials exhibited improved and exceptional durability by timedependent potentiostatic electrochemical measurement for 24 h and continuous cyclic voltammetry for 1000 times. Our result suggests that this new OER electrocatalyst for OER can be applied in various water-splitting devices and can promote hydrogen economy.
關鍵字
語言 en_US
ISSN
期刊性質 國外
收錄於 SCI
產學合作
通訊作者 C. L. Dong and R. S. Liu
審稿制度
國別 TWN
公開徵稿
出版型式 ,電子版
相關連結

機構典藏連結 ( http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/111833 )