Nanomolar detection of hydrogen peroxide on glassy carbon electrode modified with electrodeposited cobalt oxide nanoparticles

Redox Protein-Polymer Films for Simultaneous Determination of Ascorbic Acid and Hydrogen Peroxide

“…Many electrochemical [11][12][13][14][15][16] spectrophotometry 17,18 have been reported for the determination of hydrogen peroxide. Electrochemical sensors are suitable since they achieve low detection limits and rapid response time.…”

An Efficient Amperometric Sensor for Hydrogen Peroxide by Using a Carbon Paste Electrode Modified with Cobalt Impregnated Zeolite

“…1, it can be seen that whereas neither oxidation nor reduction peaks are seen on CPE and ZMCPE, a well-developed redox wave was observed on the Co-ZMCPE. It can be attributed to the oxidation/reduction conversion between cobalt phases of Co(OH) 2 and CoOOH, which are stable at alkaline pH [42][43][44][45], and in accordance with the following equation:…”

“…Also, the effect of pH on the catalytic oxidation behavior was investigated. No peak currents were observed at pH values below 5, probably due to the solution of cobalt oxide film (not shown) [45]. At pH values of 5-13, the modified electrode shows electrocatalytic activity.…”

“…Finally, the Co-ZMCPE was immersed in 0.1 M NaOH solution and the potentials were cycled between -0.2 and 0.6 V vs. Ag/AgCl, KCl (3 M) at v = 50 mV s -1 until reproducible cyclic voltammograms were attained. In this solution, Co ions at the electrode surface will be converted into Co(OH) 2 species according to the following reaction [42][43][44][45]: …”

A sensitive nonenzymatic hydrogen peroxide sensor using cadmium oxide nanoparticles/multiwall carbon nanotube modified glassy carbon electrode

“…Nanoscale metal oxides are a very promising class of electrocatalysts because they are active, inexpensive and thermodynamically stable [9]. To date, different metal oxide particles and nanoparticles such as copper oxide [10] zirconium oxide [11], ruthenium oxide [12], cobalt oxide [13,14], iron oxide [15,16] and nickel oxide [17][18][19], manganese oxide [20], titanium oxide [21] and zinc oxide [22] have been successfully used for sensing H 2 O 2 . Nanoscale CdO with different morphologies has been synthesized [23][24][25] and this oxide is known to possess high electrical conductivity, high carrier concentration and high transparency in the visible range of the electromagnetic spectrum [26].…”