A bioinspired copper 2,2-bipyridyl complex immobilized MWCNT modified electrode prepared by a new strategy for elegant electrocatalytic reduction and sensing of hydrogen peroxide

A New Redox Mediator (Cupric‐Neocuproine Complex)‐ Modified Pencil Graphite Electrode for the Electrocatalytic Oxidation of H2O2: A Flow Injection Amperometric Sensor

“…logν (Figure D). k s is calculated to be 1.43 s −1 using log k s = α log(1‐ α )+(1‐ α )log α ‐log[ RT / nFν ]‐ α (1‐ α ) nF Δ E p/2.3 RT equation (R, T and F are the universal gas constant, the temperature in Kelvin scale and Faraday's constant, respectively) at ν of 0.1 V/s in which Δ E p is 0.030 V. This k s value is comparable with k s values obtained from some modified electrodes such as Cu(bpy) 2+ /Nf‐MWCNT/GCE (1.23 s −1 ) and [Mn(bpy) 2 (H 2 O) 2 ] 2+ /f‐MWCNT/GCE (1.12 s −1 )…”

“…α was found to be 0.56 using m a /m b = α/(1-α) equation, where m a and m b are slopes of the linear plots of E pa and E pc vs. logν ( Figure 2D). k s is calculated to be 1.43 s À 1 using logk s = αlog (1- (1.23 s À 1 ) [27] and [Mn(bpy) 2 (H 2 O) 2 ] 2 + /f-MWCNT/GCE (1.12 s À 1 ) [48] CVs were also recorded in the Britton-Robinson buffer (BRB) solutions in the pH range from 2 to 9 at a scan rate of 50 mV/s ( Figure S3). Recorded CVs show that oxidation/reduction peak potentials of [Cu(Nc) 2 ] 2 + /Nf/PGE were not changed with increasing pH of buffer solutions.…”

“…Thus CMEs prepared with different types of mediators have been reported for the determination of H 2 O 2 . For example, some copper complexes with different ligands such as 2,2‐bipyridyl, 1,10‐phenanthroline, poly‐melamine, 2,4,6‐tris(2‐pyridyl)‐1,3,5‐triazine and DNA with poly(allylamine); azine type dyes such as methylene blue, meldola blue, nile blue, azure A, thionin and ferrocene/thionin (as a bimediator); antraquinone and hydroquinone derivatives; cytocrome C; Prussian blue [PB); poly‐hemin and hemoglobin with MoS 2 and AuNPs etc. have been reported for the electrocatalytic reduction of H 2 O 2 .…”

Bis(2,2′-bipyridil)Copper(II) Chloride Complex: Tyrosinase Biomimetic Catalyst or Redox Mediator?

“…The H 2 O 2 undergoes irreversible redox reactions providing broad cathodic or anodic peak occurring at high potentials. To improve the selectivity of the amperometric detection of H 2 O 2 , transducer surfaces are modified with substances that have catalytic (mediating) activity including: (I) transition metal ions, their oxides or complexes [ 14 , 21 , 22 ] (II) organic dyes, especially Prussian blue [ 23 ] or iron phtalocyanine [ 24 ], and (III) nanomaterials [ 25 ].…”

Electrochemically Inspired Copper(II) Complex on Disposable Graphite Pencil Electrode for Effective Simultaneous Detection of Hypoxanthine, Xanthine, and Uric Acid

“…Efficiency of different forms of copper ions nanoparticle, composites and complexes have been demonstrated for numerous industrial applications involving electrochemical reduction of CO 2 in fuels , methanol and ethanol oxidations , reductions of some important environmental pollutants , oxygen , hydrogen evolution reactions and electrochemical sensing of peroxides . However, practical applications of copper compounds are limited and unattractive due to poor selectivity as a result of interferences of some redox peaks of copper (Cu 3+/2+ , Cu 2+/1 and Cu 1+/0 ) with targeted compounds and or atoms and challenges of immobilization of a stable copper complexes on solid electrode without electrochemical fouling on immobilized solid electrodes .…”