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Triboelectrification-Induced Large Electric Power Generation from a Single Moving Droplet on Graphene/Polytetrafluoroethylene
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posted on 2016-07-14, 00:00 authored by Sung Soo Kwak, Shisheng Lin, Jeong
Hwan Lee, Hanjun Ryu, Tae Yun Kim, Huikai Zhong, Hongsheng Chen, Sang-Woo KimRecently,
several reports have demonstrated that a moving droplet of seawater
or ionic solution over monolayer graphene produces an electric power
of about 19 nW, and this has been suggested to be a result of the
pseudocapacitive effect between graphene and the liquid droplet. Here,
we show that the change in the triboelectrification-induced pseudocapacitance
between the water droplet and monolayer graphene on polytetrafluoroethylene
(PTFE) results in a large power output of about 1.9 μW, which
is about 100 times larger than that presented in previous research.
During the graphene transfer process, a very strong negative triboelectric
potential is generated on the surface of the PTFE. Positive and negative
charge accumulation, respectively, occurs on the bottom and the top
surfaces of graphene due to the triboelectric potential, and the negative
charges that accumulate on the top surface of graphene are driven
forward by the moving droplet, charging and discharging at the front
and rear of the droplet.