Volume-doped cobalt titanates for ethanol sensing: An impedance and X-ray absorption spectroscopy study

Belle, Clemens J.; Wesch, Günter E.; Neumeier, Stefan; Lozano-Rodriguez, M. Janeth; Scheinost, Andreas C.; Simon, Ulrich

doi:10.1016/j.snb.2013.10.094

Cited by 15 publications

(3 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[37][38][39] The fitting of the sample calcined at 650 • C supports the XRD results indicating crystalline CoTiO 3 but the Co-O bond distance (2.07 Å) is slightly shorter than the average in CoTiO 3 (2.1 Å) which may indicate incomplete crystallinity, strain, or remaining presence of spinel domains. 38,40,41 There is a second major peak around 2.5Å which is also present in the samples calcined at 650 • C and 450 • C, but is blended with neighboring peaks into a plateaued signal of relatively low intensity for the sample calcined at 150 • C. Again, the varying amplitude and width indicates that this feature may be representative of different structural motifs for each of these materials. The large amplitude and narrowness of this peak for the material calcined at 650 • C indicates that it is likely caused by a single phase feature, whereas the relatively short and broad peaks in the samples calcined at 450 • C and 150 • C could indicate a mix of phases or amorphous character.…”

Section: Resultsmentioning

confidence: 88%

CoTiO_xCatalysts for the Oxygen Evolution Reaction

Seitz

Pinaud

Nordlund

et al. 2015

J. Electrochem. Soc.

View full text Add to dashboard Cite

Developing improved catalysts for the oxygen evolution reaction (OER) is a crucial step for advancing technology in renewable fuels, e.g. solar water splitting. In this work, we identify CoTiO x as a novel nonprecious metal catalyst for the OER and explore the effect of temperature treatments on its activity, structure, and electronic state. Using a simple and scalable sol-gel synthesis, this catalyst can be deposited on a wide variety of conductive substrates. Physical and electronic characterization of the most active CoTiO x catalyst, prepared at low temperature (150 • C), reveals an amorphous thin film structure with an oxidation state similar to that of other active cobalt catalysts. Electrochemical testing and X-ray absorption spectroscopy show that the more active, amorphous catalysts undergo greater changes in oxidation state during OER than the less active, crystalline catalysts. Extended electrochemical testing shows that the catalysts are stable in basic electrolyte.

show abstract

Section: Resultsmentioning

confidence: 88%

CoTiO_xCatalysts for the Oxygen Evolution Reaction

Seitz

Pinaud

Nordlund

et al. 2015

J. Electrochem. Soc.

View full text Add to dashboard Cite

show abstract

“…4(a)) in the high frequency region corresponding to the charge transfer resistance (R ct ) at the interface between the working electrode and electrolyte and larger one in the low frequency region corresponding to the ohmic resistance of the lm. 34 As from Fig. 4(b), we have observed the impedance curve with a single semicircle (shown as an inset gure in Fig.…”

Section: Photo-electrochemical Analysis (Eis Pctr and Ocvd)mentioning

confidence: 64%

Organic semiconductor/graphene oxide composites as a photo-anode for photo-electrochemical applications

et al. 2018

View full text Add to dashboard Cite

show abstract

“…[38][39][40][41] In fact, at the knee point potential, the n-type behavior is switched to p-type behavior and vice versa. The prepared CoTiO 3 is a p-type semiconductor, 42 but the existence of oxygen vacancy could convert it to an n-type semiconductor. 43 This conclusion is supported by the responsibility of oxygen vacancies for conductivity in this semiconductor.…”

Section: Wileyonlinelibrarycom/jctbmentioning

confidence: 99%

Revealing electronic structure of nanostructured cobalt titanate via a combination of optical and electrochemical approaches toward water splitting and CO₂ reduction

Moghiminia,

Farsi,

Zubkov

et al. 2023

J of Chemical Tech & Biotech

View full text Add to dashboard Cite

Background: The shortage of clean energy has become a serious problem due to the rapid development of societies and the increasing consumption of fossil fuels. Metal oxide semiconductor nanomaterials have been studied as photo-/electrocatalysts for water splitting in terms of clean energy generation. Applications of semiconductors depend on their electronic structures. Therefore, elucidating the electronic diagram is essential for determining the specific applications of novel semiconductors.Results: Herein, we demonstrate using a combination of UV-visible diffuse reflectance spectroscopy (DRS) and Mott-Schottky analysis via electrochemical impedance spectroscopy for sketching the electronic diagram of nanostructured cobalt titanate (CoTiO 3 ) prepared by the sol-gel method. UV-visible DRS studies reveal a band gap of 2.5 and 2.1 eV for direct and indirect transitions of prepared nanostructured materials, respectively. Mott-Schottky analysis shows a 0.8 V versus Ag/AgCl value for the flat band potential for CoTiO 3 . We further show the application of this diagram toward the interpretation of the electrochemical behavior of nanostructured CoTiO 3 for electrochemical water splitting reactions and the electrochemical CO 2 reduction reaction (eCO 2 RR). Conclusion:The presented electrochemical and photoelectrochemical studies demonstrate nanostructured CoTiO 3 as an effective catalyst for electrochemical water oxidation and the eCO 2 RR. Moreover, our results provide valuable information for further investigation of water splitting and photovoltaic energy conversion.

show abstract

Volume-doped cobalt titanates for ethanol sensing: An impedance and X-ray absorption spectroscopy study

Cited by 15 publications

References 31 publications

CoTiO_xCatalysts for the Oxygen Evolution Reaction

CoTiO_xCatalysts for the Oxygen Evolution Reaction

Organic semiconductor/graphene oxide composites as a photo-anode for photo-electrochemical applications

Revealing electronic structure of nanostructured cobalt titanate via a combination of optical and electrochemical approaches toward water splitting and CO₂ reduction

Contact Info

Product

Resources

About

Volume-doped cobalt titanates for ethanol sensing: An impedance and X-ray absorption spectroscopy study

Cited by 15 publications

References 31 publications

CoTiOxCatalysts for the Oxygen Evolution Reaction

CoTiOxCatalysts for the Oxygen Evolution Reaction

Organic semiconductor/graphene oxide composites as a photo-anode for photo-electrochemical applications

Revealing electronic structure of nanostructured cobalt titanate via a combination of optical and electrochemical approaches toward water splitting and CO2 reduction

Contact Info

Product

Resources

About

CoTiO_xCatalysts for the Oxygen Evolution Reaction

CoTiO_xCatalysts for the Oxygen Evolution Reaction

Revealing electronic structure of nanostructured cobalt titanate via a combination of optical and electrochemical approaches toward water splitting and CO₂ reduction