To prepare photo anode P and titania nanotubes

For fabrication of E-MWCNT counter electrode, MWCNT powder (carbon content >95%, 6–9 nm diameter, 5 μm length) was purchased from Sigma–Aldrich Co. Three different enzyme based dispersant; lipase from candida rugosa, glucose oxidase (Gox) from aspergillus niger, laccase from trametes versicolor and carboxymethyl cellulose (sodium salt of MW 250,000 g) used as binder were purchased from Sigma–Aldrich Co. For Pt counter electrode, chloroplatinic NSC697923 hexahydrate (H2PtCl6) was purchased from Sigma Aldrich Co.