Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 24, Issue 13, Pages 1840-1846Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201303042
Keywords
TiO2 nanotubes; plasma-assisted hydrogenation; supercapacitors; nanotube arrays; power sources
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Funding
- National Natural Science Foundation of China [21001046, 51102271, 91123008, 61377033]
- 973 Program of China [2011CB933300]
- Program for New Century Excellent Talents of the University in China [NCET-11-0179]
- Natural Science Foundation of Shanghai [11ZR1436300]
- Shanghai Rising-Star Program [11QA1406400]
- Shanghai Municipal Human Resources and Social Security Bureau [2011033]
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One-dimensional anodic titanium oxide (ATO) nanotube arrays hold great potential as electrode materials for both dye-sensitized solar cells (DSSCs) and electrochemical supercapacitors (SCs). In this work, a novel stack-integrated photo-supercapacitor (PSC) thin-film device is presented, composed of a DSSC and a SC built on bi-polar ATO nanotube arrays, where an improved SC performance is achieved through selective plasma-assisted hydrogenation treatment. At a high current density of 1 mA/cm(2) in charge/discharge measurements, the areal capacitance of selective hydrogenated ATO two-electrode sub-device is substantially increased approximate to 5.1 times, with the value as high as 1.100 mF/cm(2). The optimized PSC exhibits a remarkable overall photoelectric conversion and storage efficiency up to 1.64%, with fast response and superior cycling capability for more than 100 photocharge/galvanostatic discharge cycles without any decay. To meet applicable demands with a larger output voltage, a tandem PSC system is constructed, serving as the self-driven power source for an LED.
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