Journal
NANO LETTERS
Volume 14, Issue 6, Pages 3668-3673Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl5014579
Keywords
Photoelectrochemical; solar energy conversion; pseudocapacitor; nanowire; sensor
Categories
Funding
- National Key Basic Research Program of China [2013CB934104]
- Natural Science Foundation of China [21322311, 21071033]
- Program for New Century Excellent Talents in University [NCET-10-0357]
- Ministry of Education of China
- Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning
- King Saud University (IHCRG) [14-102]
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We report the development of a multifunctional, solar-powered photoelectrochemical (PEC)-pseudocapacitive-sensing material system for simultaneous solar energy conversion, electrochemical energy storage, and chemical detection. The TiO2 nanowire/NiO nanoflakes and the Si nanowire/Pt nanoparticle composites are used as photoanodes and photocathodes, respectively. A stable open-circuit voltage of similar to 0.45 V and a high pseudocapacitance of up to similar to 455 F g(-1) are obtained, which also exhibit a repeating charging-discharging capability. The PEC-pseudocapacitive device is fully solar powered, without the need of any external power supply. Moreover, this TiO2 nanowire/NiO nanoflake composite photoanode exhibits excellent glucose sensitivity and selectivity. Under the sun light illumination, the PEC photocurrent shows a sensitive increase upon different glucose additions. Meanwhile in the dark, the open-circuit voltage of the charged pseudocapacitor also exhibits a corresponding signal over glucose analyte, thus serving as a full solar-powered energy conversion-storage-utilization system.
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