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작성일 : 17-10-16 20:55
Scavenging road side waste mechanical energy_Nanoscale
 글쓴이 : supervisor
조회 : 606  
   20171021_Vivek_1st_Nanoscale.pdf (2.7M) [5] DATE : 2017-10-16 20:55:58
20171021 Venkateswaran Vivekananthan, Nagamalleswara Rao Alluri, Yuvasree Purusothaman, Arunkumar Chandrasekhar and Sang-Jae Kim, A flexible, planar energy harvesting device for scavenging road side waste mechanical energy via the synergistic piezoelectric response of K0.5Na0.5NbO3-BaTiO3/PVDF composite films, Nanoscale, 2017, 9(39), 15122 - 15130

Flexible, planar composite piezoelectric nanogenerators (C-PNGs) were developed to harness waste
mechanical energy using cost-effective composite films (CFs) prepared via a probe-sonication technique.
CFs, made up of highly crystalline, randomly oriented lead free piezoelectric nanoparticles (1 − x)
K0.5Na0.5NbO3-xBaTiO3, where x = 0.02, 0.04, 0.06, or 0.08 [designated as KNN-xBTO], were impregnated
in a polyvinylidene fluoride (PVDF) matrix. The KNN piezoelectric properties were tuned via the substitution
of BTO nanoparticles, without altering the orthorhombic phase. A C-PNG device (x ≈ 0.02) generates
a maximum open circuit voltage ≈160 V, and the instantaneous area power density is ≈14 mW m−2
upon a low mechanical force ≈0.4 N. The effects of BTO concentration in the KNN lattice, electrical
poling effects, the fixed weight ratio of nanoparticles in the PVDF matrix, switching polarity tests, and load
resistance analysis of C-PNG devices were investigated with constant mechanical force. Furthermore, the
experimentally demonstrated C-PNG device output is sufficient to drive commercial blue light emitting
diodes. The C-PNG device was placed on a road side, and the maximum energy generation and stability
under real time harsh conditions, such as vehicle motion (motorcycle and bicycle) and human walking,
were tested. C-PNG generates a peak-to-peak output voltage ≈16 V, when motorcycle forward/backward
motion acts on it. This result indicates that the C-PNG device is a potential candidate to power road side
sensors, speed tachometers, light indicators, etc. on highways.