A biopolymer composite consisting of polypyrrole, ABTS, and laccase (PAL) was electrodeposited onto the surface of an electrode and was shown to catalyze the reduction of dioxygen to water under acidic conditions. The catalytic activity of this biopolymer composite is highest at pH 4, decreasing with increasing pH. The activity of laccase immobilized within this polymer composite was found to be higher than laccase dissolved in solution when methanol was present or at elevated temperatures.
The electrochromic properties of an electrodeposited polymer composite consisting of poly(3,4ethylenedioxythiophene) (PEDOT) doped with poly(3-methyl-2-{[3-(4-vinyl-benzyl)-3H-benzothiazol-2-ylidene]-hydrazono}-2,3-dihydro-benzothiazole-6-sulfonic) acid (polyABTS) are reported. Films of this polymer composite exhibit three electrochromic states in the visible region upon application of potentials at -800 mV, 0 V, and +800 mV versus Ag/AgCl, confirming that both polymers contribute to electrochromic switching. These films exhibit ultracontrasts between the bleached state at 0 V and the blue state at -800 mV (∆T % ) 33.6% at 615 nm) and the green state at +800 mV (∆T % ) 46.3% at 393 nm). The efficiency of cathodic coloration and bleaching of this material at 615 nm is 322.1 and 396.4 cm 2 C -1 , respectively, whereas the efficiency of anodic coloration and bleaching at 393 nm is 189.9 and 192.4 cm 2 C -1 , respectively. In comparison to previously reported films of polypyrrole (pPy) doped with the ABTS monomer (pPy[ABTS]), thick films of PEDOT[polyABTS] exhibit an increased stability to potential cycling both because PEDOT is more resistant to overoxidation than pPy and because polyABTS is a nonleachable dopant. Reversible redox behavior, anodic and cathodic coloration, fast response times, resistance to overoxidation, ease of fabrication, and low cost make this material competitive for electrochromic applications.
[structure: see text] A versatile strategy for the synthesis of polymerizable derivatives of the redox-active indicator dye 2,2'-azino-bis(3-ethylbenzthiazoline-6-sulfonic acid) (ABTS) is reported. Two products are shown to illustrate how the final step in the synthetic strategy can be used to alter the physical properties of the product. Both products were characterized spectroscopically and electrochemically. The hydrophilic monomer (sABTS) was polymerized, and the utility of this polymer (polyABTS) is demonstrated in the context of bioelectrocatalysis.
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