Synthesis and characterization of polypyrrole‐platinum composite for use as electrode material

Abstract

Synthesis and characterization of polypyrrole (PPy) supported platinum by a simple method is reported in this study. The porous structure of PPy and its tendency for doping with acids prompted us to utilize this property to incorporate platinum by adsorption followed by reduction on the PPy matrix. Dispersed platinum electro catalyst on the conducting PPy support provides favorable reaction site for redox reactions in electrochemical devices such as hydrox fuel cell. The mesoporous matrix of PPy as revealed by FESEM could facilitate effective contact between the reactant gases and electro catalyst. The cauliflower like structure of the PPy matrix could enhance the electrochemical active surface area of the catalyst. The composite material is characterized by cyclic voltammetry (CV), polarization study, four probe technique, density and porosity study. The CV highlights the use of PPy‐Pt hybrid as a capacitor and the Tafel plot infers on the high exchange current density of the hybrid material. POLYM. COMPOS. 2012. © 2012 Society of Plastics Engineers

Semiconductive poly[N1,N4‐bis(thiophen‐2‐ylmethylene)benzene‐1,4‐diamine]‐nickel oxide nanocomposite based ethanol sensor

“…The exchange current density of the BTMBDA and PBTMBDA were evaluated. Tafel plot furnished the exchange current density . The Tafel plots of BTMBDA and PBTMBDA recorded in DMF with 1.0 M tetra butyl ammonium hexa fluoro phosphate supporting electrolyte solution are shown in Figure .…”

“…Tafel plot furnished the exchange current density. 18 The Tafel plots of BTMBDA and PBTMBDA recorded in DMF with 1.0 M tetra butyl ammonium hexa fluoro phosphate supporting electrolyte solution are shown in Figure 4. The exchange current density evaluated for the BTMBDA and PBTMBDA are 0.2815 3 10 28 and 1.1508 3 10 28 A cm 22 , respectively.…”

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“…The typical Nyquist plots of Ag/PPy composites electrode are shown in Figure 8. In high‐frequency intercept of the real axis, an internal resistance ( R s ) can be observed, which included the resistance of the electrolyte, the intrinsic resistance of the active material, and the contact resistance at the interface active material/current collector 38. The difference in the real part of the impedance between low and high frequencies could be used to evaluate the value of electrochemical charge transfer resistance ( R ct ) 39.…”

Preparation and characterization of coaxial mullite/polypyrrole fibrous nanocomposites via self‐assembling and in situ surface‐initiated polymerization

“…However, there is a weak redox peak of the polymer at about 0 V with the low scan rates. The deviation from rectangularity of the CV becomes obvious, which is mainly due to the resistance of the electrode .…”