Therefore, the heterostructure is promising in constructing supercapacitors. Figure 5 Electrochemical behavior of the ZnO NWs/GO heterostructures. (a) CV curves of GO, ZnO NWs, ZnO NWs/GO heterostructure. (b) Magnified CV curve of GO. (c) Magnified CV curve
SBE-��-CD molecular weight of ZnO NWs. The scan rate of curves in (a-c) is 100 mV s−1. (d) CV curves of ZnO NWs/GO heterostructure at different scan rates. In comparison, the CV curves of GO films and ZnO NWs arrays are shown in Figure 5b,c, respectively. In Figure 5b, the shape of the CV loop of GO films is close to a rectangle, indicating good charge propagation at the WH-4-023 electrode surface. In contrast, due to the internal resistance of Autophagy Compound Library screening the composite electrode, the curve shape of the ZnO NWs arrays is distorted (Figure 5c). In addition, the curve shape of ZnO NWs/GO heterostructure is neither a rectangle (Figure 5a). The CV loops result from the superposition of the electric double-layer capacitance and pseudocapacitance due to the reaction between ZnO and electrolyte, which is mainly governed by the intercalation and deintercalation of Na+ from electrolyte into ZnO: ZnO + Na+ + e− ← → ZnO Na. Figure 5d shows the cyclic CV curves
of ZnO NWs/GO films at different sweep rates. The distorted regular shape of the CV curves reveals double-layer capacitive and pseudocapacitance behaviors, which were due to the large internal resistance of the composite and the redox reaction of ZnO, as aforementioned. It can be seen that the CV curves retain a similar shape for the entire sweep. This indicates that the materials have excellent stability, and the electrolyte ions can diffuse into the GO network. Conclusions In summary, ZnO NWs/GO heterostructures have been successfully prepared via a simple solution approach at low temperature. The results showed that the GO layer can facilitate the vertical growth
of ZnO NWs and improve their crystal Meloxicam quality. Visible emission quenching was observed in the PL spectra of ZnO NWs/GO heterostructures. The UV emission was greatly enhanced, and the defect-related visible light emission was suppressed. The heterostructures exhibited reversible electrochemical behavior. The combination of the GO and ZnO NWs enabled such composites to possess positive electrochemical behaviors that are promising as electrode material for supercapacitors. In addition, the prepared materials are expected to have potential applications as catalysts, absorbents, and electrodes for other electronic devices. Acknowledgments We acknowledge the financial support of the NSFC (51072119, 51102168, 51272157), Innovation Program of Shanghai Municipal Education Commission (12ZZ139), Shanghai Leading Academic Discipline Project (B502) and the Key Project of Chinese Ministry of Education (12057). References 1.