Photoelectrochemical versus Electrochemical Detection of H₂O₂ Using an All‐inorganic Sensor Based on Nanostructured Copper Oxide

Abstract

Dedicated to Professor Wolfgang Schuhmann on the occasion of his 60 th birthday.

Photoelectrochemical Sensing of Hydrogen Peroxide on Hematite

“…Keeping this in mind, we gathered in Table 1 benchmark values reported for H 2 O 2 PEC sensors based on several semiconductor photoelectrodes. It shows that our LOD is lower than the ones obtained on BiVO 4 , [34,35] Si, [36] CuO [38] and CdS [39] -based photoelectrodes. In addition, our linear range, which spans 2 orders of magnitudes in concentration, is large and greater than the ones reported for TiO 2 , [28] WO 3 , [31] ZnO [32,33] and Cu 2 O [37] -based photoelectrodes.…”

“…So far, PEC sensing has been mainly employed for the detection of biological macromolecules, in immuno‐ or apta‐ assays and has also been explored for the detection of small organic molecules such as antioxidants or glucose . While H 2 O 2 is a widely‐employed hole scavenger in the field of energy‐related photoelectrochemical research (typically used to probe the upper performance of water‐splitting photoanodes), the PEC sensing of H 2 O 2 has been only reported on TiO 2 , WO 3 , ZnO, BiVO 4 , and Si‐based photoanodes and on Cu 2 O, CuO, CdS, and CuInS 2 ‐based photocathodes.…”

“…[18,19] So far, PEC sensing has been mainly employed for the detection of biological macromolecules, [20] in immuno- [21] or apta- [22] assays and has also been explored for the detection of small organic molecules such as antioxidants [23] or glucose. [24,25] While H 2 O 2 is a widely-employed hole scavenger in the field of energy-related photoelectrochemical research (typically used to probe the upper performance of watersplitting photoanodes), [26,27] the PEC sensing of H 2 O 2 has been only reported on TiO 2 , [28][29][30] WO 3 , [31] ZnO, [32,33] BiVO 4 , [34,35] and Si [36] -based photoanodes and on Cu 2 O, [37] CuO, [38] CdS, [39] and CuInS 2 [40] -based photocathodes. Hematite (α-Fe 2 O 3 ) is a promising photoanode material due to its great abundance, low-cost, chemical stability and its high theoretical photoconversion efficiency.…”

One-step in situ Controllable Synthesis of MnFe2O4/rGO Nanocomposite and Its Application to Electrochemical Sensing of Hydrogen Peroxide

“…From Table 1, it is clear that the electrochemical sensing performance characteristics of as-fabricated MnFe 2 O 4 /rGO/SPCE are analogous and even superior to those in the recent reports. (26)(27)(28)(29)(30) Figure 5 shows the amperometric response curves after 0.1 mM H 2 O 2 and 0.5 mM AA, UA, DA, and Glu were continuously added to 0.1 M PBS (pH 7.4). As shown by the figure, the above interfering substances have no significant effect on the detection of H 2 O 2 .…”

Electrochemical Properties of Highly Sensitive and Selective CuO Nanostructures Based Neurotransmitter Dopamine Sensor

“…A wide range of metal oxides, polymer, carbonaceous material, nanomaterial composites with various nanostructuring, size and shape were studied and employed for the design of electrochemical sensor . In particular, the sensors based on metal oxides have demonstrated to be more efficient because of high selectivity, sensitivity, low cost, easy to synthesize in various nanostructures and excellent electroactivity , , . Copper oxide (CuO), a p‐type metal oxide semiconductor with a bandgap in the range of 1.2 to 2.2 eV is a material of great interest due to its excellent electro‐sensitivity in alkaline condition , .…”