For the first time, large-area CVD-grown graphene films transferred onto flexible PET substrates were used as transparent conductive electrodes in alternating current electroluminescence (ACEL) devices. The flexible ACEL device based on a single-layer graphene electrode has a turn-on voltage of 80 V; at 480 V (16 kHz), the luminance and luminous efficiency are 1140 cd/m(2) and 5.0 lm/W, respectively. The turn-on voltage increases and the luminance decreases with increasing stacked layers of graphene, which means the single-layer graphene is the best optimal choice as the transparent conductive electrode. Furthermore, it demonstrates that the graphene-based ACEL device is highly flexible and can work very well even under a very large strain of 5.4%, suggesting great potential applications in flexible optoelectronics.
High-quality, reduced graphene oxide (RGO) homogeneously coated LiCo 1/3 Ni 1/3 Mn 1/3 O 2 (NCM) was synthesized by ultrasonically mixing/stirring GO and NCM in water and then thermal reduction of GO to RGO. The composite NCM cathode shows much higher specific capacity, better cycling stability and high rate performance after being wrapped by RGO, which is attributed to the much lower electrochemical impedance for the electrode due to the presence of RGO. It is promising for RGO modified NCM to be used as an excellent cathode.
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