Electrochromic Properties of Polyaniline Films on Graphene-ITO Composite Electrode†

doi:10.7503/cjcu20160636

Abstract

Abstract:

Graphene oxide(GO) aqueous solution was synthesized by modified Hummers method. Graphites reacted with concentrated sulfuric acid, potassium persulfate and phosphorus pentoxide to get strong oxidized products, then reacted with concentrated sulfuric acid, sodium nitrate and potassium permanganate. GO solution was obtained through the foaming of hydrogen peroxide, pickling and ultrasonic. After the reduction of metal copper and substrate transformation process, GO-indium tin oxide(ITO) composite electrode was prepared. Then, polyaniline(PANI) film was prepared on the composite electrode by electropolymerization technique and further characterized. Compared to that on ITO electrode, PANI film on GO-ITO composite electrode showed a more homogeneous and uniform nanoparticle morphology and better film-forming character, providing larger interface area between the polymer and electrolyte and more transport channel for counterions. The result showed that PANI film exhibited higher optical contrast with increasing by 13% at 700 nm, faster switching speed with reducing by 2.6 s, high coloration efficiency of 169.6 cm²/C and still remained the original good electrochemical stability. In summary, GO-ITO composite electrode can effectively improve electrochromic performance, endowing the potential applications on electrochromic materials and devices.

Key words: Electrochromism, Polyaniline, Graphene, Composite electrode, Electropolymerization

CLC Number:

O631
O646

TrendMD:

LÜ Xiaojing, YU Pengfei, OUYANG Mi, QIAN Liang, YAN Shuanma, JIN Xiaoqiang, ZHANG Cheng. Electrochromic Properties of Polyaniline Films on Graphene-ITO Composite Electrode^†[J]. Chem. J. Chinese Universities, 2017, 38(4): 694.

Figures/Tables 11

Scheme 1 Preparation routes of the GO-ITO composite electrode

Fig.1 I-t curves of PANI on ITO(A) and GO-ITO composite electrodes(B)

Fig.2 FTIR spectrum of GO film

Fig.3 SEM images of surface morphology(A) and cross-sectional view(B) of GO film

Fig.4 Cyclic voltammetry curve of GO-ITO electrode(A) and light transmittance curves of ITO(a) and GO-ITO(b) electrodes(B) Insets of (B): digital images of ITO(A') and GO-ITO(B').

Fig.5 SEM images of cross-sectional PANI coated GO-ITO(A), PANI coated ITO(B) and PANI coated GO-ITO(C)

Fig.6 Cyclic voltammetry curves of PANI film on ITO(a) and GO-ITO(b) electrodes

Fig.7 Electrochemical stability of PANI film on ITO(A) and GO-ITO(B) electrodes in 1 mol/L H2SO4 solution from -0.2 V to 0.6 V for 1 cycle(a) and 500 cycles(b) Scan rate: 0.3 V/s.

Fig.8 Spectroelectrochemical behavior of PANI film on ITO(A) and GO-ITO(B) electrodes under different potentialsInset of (A): color changes of PANI film on ITO electrode between 0 and 1.6 V; inset of (B): color changes of PANI film on GO-ITO electrode between 0 and 1.6 V.

Fig.9 Optical contrast of PANI film on ITO electrode(a) and GO-ITO electrode(b) at 700 nm(A) and 1100 nm(B)

Fig.10 Response time of PANI on ITO(A) and GO-ITO(B) electrodes at 700 nm

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