Electrochemical dissolution of Co3O4 in acidic solutions

Кожина, Г. А.; Ермаков, А. Н.; Fetisov, V. B.; Фетисов, А. В.; Shunyaev, K. Yu.

doi:10.1134/s1023193509100097

Cited by 19 publications

(14 citation statements)

References 9 publications

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“…To achieve stable and efficient O 2 evolution by BiVO 4 , Co 3 O 4 was utilized as the co‐catalyst for water oxidation. Co 3 O 4 has been recognized as an efficient co‐catalyst for the evolution of O 2 from water [38–42] . The photoanode, comprising BiVO 4 and Co 3 O 4 , has already been investigated under the neutral pH condition [43] .…”

Section: Resultsmentioning

confidence: 99%

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A Water‐Splitting System with a Cobalt (II,III) Oxide Co‐Catalyst‐Loaded Bismuth Vanadate Photoanode Along with an Organo‐Photocathode

et al. 2020

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In the water‐splitting reaction, the oxidation of water to O2 is considered to be a kinetically demanding process, so that a co‐catalyst has been usually applied to promote water oxidation. This work demonstrates that, when loading mixed‐valence cobalt (II,III) oxide (Co3O4) dispersed in a Nafion membrane (Nf) on a nanoporous bismuth vanadate (BiVO4) photoanode (i. e., BiVO4/Nf[Co3O4]), stable and efficient water oxidation occurred. In particular, it is noteworthy that the BiVO4/Nf[Co3O4] photoanode exhibited stable performance even in an acidic medium (pH=2). In the present system consisting of a BiVO4/Nf[Co3O4] photoanode along with an organo‐photocathode, the stoichiometric formation of O2 and H2 successfully occurred by applying just 0.1 V between the photoelectrodes (cf. maximum efficiency, ca. 0.2 %), which was superior to the prototype comprising BiVO4 and Pt counter electrode. The Co3O4 loading can effectively suppress the collapse of the nanostructured BiVO4 upon photocorrosion, resulting in the stable and kinetically efficient consumption of holes in BiVO4.

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Section: Resultsmentioning

confidence: 99%

“…Co 3 O 4 was previously reported to be unstable in acidic media [38–42] (cf. the Pourbaix diagram for Co‐water system to be interpreted in equilibrium state [49] ) and to exhibit poor adhesion to substrates [50,51] .…”

Section: Resultsmentioning

confidence: 99%

A Water‐Splitting System with a Cobalt (II,III) Oxide Co‐Catalyst‐Loaded Bismuth Vanadate Photoanode Along with an Organo‐Photocathode

et al. 2020

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“…The small-sized Fe 2 O 3 can have a larger contact surface, therefore, a higher catalytic current can be expected. 44,45 Effect of potential scanning rate on ORR activity Figure 5 shows the linear sweep voltammograms obtained at different potential rates from 5 to 500 mV s -1 in O 2 -saturated solution for oxygen reduction with individually Fe 2 O 3 and Co 3 O 4 modified GCE in BR buffer solution (pH 1.8). The voltammetric peak currents corresponding to the irreversible ORR process vary linearly with the square root of the potential scan rate (Figures 5b and 5d) for both Fe 2 O 3 /GCE and Co 3 O 4 /GCE.…”

Section: Physical-chemical Characterization Of the Catalystsmentioning

confidence: 99%

Nanoparticles of Fe2O3 and Co3O4 as Efficient Electrocatalysts for Oxygen Reduction Reaction in Acid Medium

Alves

Santos

Viégas

et al. 2019

J. Braz. Chem. Soc.

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This paper presents a comparative study about the oxygen reduction reaction (ORR) catalyzed by nanoparticles of Fe 2 O 3 and Co 3 O 4 applied on the surface of glassy carbon electrodes (GCE). The nanoparticles were synthesized using the modified polymeric precursor method (Pechini). These two nanomaterials were characterized by Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD) techniques. The estimated average particle sizes were 21 and 31 nm for Fe 2 O 3 and Co 3 O 4 , respectively. Electrochemical impedance spectroscopy (EIS) showed that Fe 2 O 3 /GCE has lower charge transfer resistance than Co 3 O 4 /GCE. The surface electrochemistry of both Fe 2 O 3 /GCE and Co 3 O 4 /GCE was studied in the solution free of O 2 , and their corresponding reaction mechanisms were analyzed. The electrocatalytic ORR activities of these two catalysts were studied by cyclic voltammetry (CV) and rotating disk electrode (RDE) in acidic solution. The results obtained by RDE indicated that both Fe 2 O 3 /GCE and Co 3 O 4 /GCE can catalyze the ORR with a dominating 2-electron transfer process to produce H 2 O 2 , using a potential of −0.8 V. These kinetic results indicate that Fe 2 O 3 /GCE is more efficient than Co 3 O 4 /GCE in terms of ORR. Considering the low cost of these two non-noble metal catalysts, they may be used as viable alternatives for ORR electrocatalysts.

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“…Recently, the spinel Co 3 O 4 has attracted attention for OER owing to its low cost, excellent catalytic properties, and high corrosion stability in alkaline solutions [43,44]. However, the application of Co 3 O 4 for OER in acids is almost stagnant because the spinel Co 3 O 4 also suffers from anodic corrosion at potentials higher than 1.47 V (vs. RHE) [45], in which the formed CoO 2 decomposes into soluble CoO with the simultaneous liberation of the O 2 [46]. In addition to dissolution mechanism, it is actually found that the failure of most OER electrodes originates from the degradation of the substrates as well as the poor adhesion between [47,48].…”

Section: Corrosion On Iro 2 Will Take Place In Parallel With O 2 Evolmentioning

confidence: 99%

Highly acid-durable carbon coated Co3O4 nanoarrays as efficient oxygen evolution electrocatalysts

et al. 2016

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Electrochemical dissolution of Co3O4 in acidic solutions

Cited by 19 publications

References 9 publications

A Water‐Splitting System with a Cobalt (II,III) Oxide Co‐Catalyst‐Loaded Bismuth Vanadate Photoanode Along with an Organo‐Photocathode

A Water‐Splitting System with a Cobalt (II,III) Oxide Co‐Catalyst‐Loaded Bismuth Vanadate Photoanode Along with an Organo‐Photocathode

Nanoparticles of Fe2O3 and Co3O4 as Efficient Electrocatalysts for Oxygen Reduction Reaction in Acid Medium

Highly acid-durable carbon coated Co3O4 nanoarrays as efficient oxygen evolution electrocatalysts

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