PMID- 22364294
OWN - NLM
STAT- MEDLINE
DCOM- 20120703
LR  - 20220317
IS  - 1530-6992 (Electronic)
IS  - 1530-6984 (Linking)
VI  - 12
IP  - 3
DP  - 2012 Mar 14
TI  - Hydrogenated TiO2 nanotube arrays for supercapacitors.
PG  - 1690-6
LID - 10.1021/nl300173j [doi]
AB  - We report a new and general strategy for improving the capacitive properties of 
      TiO(2) materials for supercapacitors, involving the synthesis of hydrogenated 
      TiO(2) nanotube arrays (NTAs). The hydrogenated TiO(2) (denoted as H-TiO(2)) were 
      obtained by calcination of anodized TiO(2) NTAs in hydrogen atmosphere in a range 
      of temperatures between 300 to 600  degrees C. The H-TiO(2) NTAs prepared at 400  degrees C 
      yields the largest specific capacitance of 3.24 mF cm(-2) at a scan rate of 100 
      mV s(-1), which is 40 times higher than the capacitance obtained from 
      air-annealed TiO(2) NTAs at the same conditions. Importantly, H-TiO(2) NTAs also 
      show remarkable rate capability with 68% areal capacitance retained when the scan 
      rate increase from 10 to 1000 mV s(-1), as well as outstanding long-term cycling 
      stability with only 3.1% reduction of initial specific capacitance after 10,000 
      cycles. The prominent electrochemical capacitive properties of H-TiO(2) are 
      attributed to the enhanced carrier density and increased density of hydroxyl 
      group on TiO(2) surface, as a result of hydrogenation. Furthermore, we 
      demonstrate that H-TiO(2) NTAs is a good scaffold to support MnO(2) 
      nanoparticles. The capacitor electrodes made by electrochemical deposition of 
      MnO(2) nanoparticles on H-TiO(2) NTAs achieve a remarkable specific capacitance 
      of 912 F g(-1) at a scan rate of 10 mV s(-1) (based on the mass of MnO(2)). The 
      ability to improve the capacitive properties of TiO(2) electrode materials should 
      open up new opportunities for high-performance supercapacitors.
CI  - (c) 2012 American Chemical Society
FAU - Lu, Xihong
AU  - Lu X
AD  - KLGHEI of Environment and Energy Chemistry, MOE of the Key Laboratory of 
      Bioinorganic and Synthetic Chemistry, School of Chemistry and Chemical 
      Engineering, Sun Yat-Sen University, Guangzhou 510275, People's Republic of 
      China.
FAU - Wang, Gongming
AU  - Wang G
FAU - Zhai, Teng
AU  - Zhai T
FAU - Yu, Minghao
AU  - Yu M
FAU - Gan, Jiayong
AU  - Gan J
FAU - Tong, Yexiang
AU  - Tong Y
FAU - Li, Yat
AU  - Li Y
LA  - eng
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
PT  - Research Support, U.S. Gov't, Non-P.H.S.
DEP - 20120305
PL  - United States
TA  - Nano Lett
JT  - Nano letters
JID - 101088070
RN  - 15FIX9V2JP (titanium dioxide)
RN  - 7YNJ3PO35Z (Hydrogen)
RN  - D1JT611TNE (Titanium)
SB  - IM
MH  - *Electric Capacitance
MH  - Electronics/*instrumentation
MH  - Equipment Design
MH  - Equipment Failure Analysis
MH  - Hydrogen/*chemistry
MH  - Nanostructures/*chemistry/*ultrastructure
MH  - Particle Size
MH  - Titanium/*chemistry
EDAT- 2012/03/01 06:00
MHDA- 2012/07/04 06:00
CRDT- 2012/02/28 06:00
PHST- 2012/02/28 06:00 [entrez]
PHST- 2012/03/01 06:00 [pubmed]
PHST- 2012/07/04 06:00 [medline]
AID - 10.1021/nl300173j [doi]
PST - ppublish
SO  - Nano Lett. 2012 Mar 14;12(3):1690-6. doi: 10.1021/nl300173j. Epub 2012 Mar 5.