A 4.5 V “dual carbon” LIC device is constructed based on all nitrogen doped graphene nanostructures. It could achieve an ultrahigh energy density of 187.9 W h kg−1 at a high power density of 2250 W kg−1 due to the alleviating kinetic mismatch.
There
is an imperative demand for real-time relative humidity (RH)
discrimination with excellent sensitivity and robust operation stability
over a broad RH range at room temperature (22 °C). Of diverse
two-dimensional (2D) materials, p-type molybdenum
disulfide (MoS2) as a typical gas-sensing candidate has
been rarely harnessed for humidity detection due to tiny response
and undesirable stability induced by the conversion from electron
to proton conduction with increasing RH. To overcome these issues,
MoS2-polyethylene oxide (PEO) inorganic–organic
nanocomposites as the sensing layer were facilely prepared in this
work. The results showed that the composition-optimized composite
film sensor surpassed the isolated MoS2 counterpart in
terms of repeatability, response, hysteresis, stability, and selectivity.
Both DC-resistance and AC-impedance analyses unveiled different roles
of MoS2 and PEO components within composites. MoS2 strengthened the film structure, while hydrophilic PEO enlarged
the water-adsorption capacity and thus improved the response and detection
reliability via water-triggered ionic conductivity. This work afforded
a feasible strategy via inorganic–organic combination to distinguish
trace RH and improved the operation stability of 2D material-based
sensors, simultaneously demonstrating realistic monitoring applications
of exhaled gas detection and distance variation of moisture-emitting
objects.
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