Electrochemical instability of indium tin oxide (ITO) glass in acidic pH range during cathodic polarization

Senthilkumar, M.; Mathiyarasu, J.; Joseph, James; Phani, K. L. N.; Yegnaraman, V.

doi:10.1016/j.matchemphys.2007.10.030

Cited by 86 publications

(68 citation statements)

References 15 publications

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“…ITO has a limited stability during cathodic polarization in acidic solutions. 22 Hydrogen intercalation into ITO and the resulting changes in optical properties have been shown to occur at potentials Ͻ−0.7 V, 23 again consistent with the finding reported here. At a potential of Ϫ0.75 V the absorption edge is shifted to lower wavelengths.…”

Section: D434supporting

confidence: 85%

Photoelectrochemical Performance of Anatase TiO[sub 2] Thin Films Deposited by Self-Limiting Growth Techniques

Wang

Kubala

Wolden

2010

J. Electrochem. Soc.

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Anatase TiO 2 photoanodes were deposited by self-limiting growth techniques at low temperature. The optical bandgap and flatband voltage of the as-deposited films agree with the values obtained from single crystal anatase. The donor density could be increased by both UV illumination and cathodic polarization in acidic solutions. Improvements in photocurrent scaled closely with changes in carrier concentration, with over 20-fold enhancements observed over the as-deposited films. The threshold potential for hydrogen intercalation was Ϫ0.6 V vs Ag/AgCl. At this level the carrier concentration could be manipulated with no change in optical transmission. At lower potentials irreversible changes are observed which are attributed to the reduction of the underlying indium tin oxide contact. In contrast, no changes were observed when fluorinated tin oxide was used as the contact layer.TiO 2 films have been widely studied as photocatalysts for water splitting and degradation of organic contaminants since the early 1970s. 1,2 Various techniques have been used to synthesize TiO 2 thin films including oxidation of titanium, 3 chemical vapor deposition ͑CVD͒, 4 plasma-enhanced chemical vapor deposition ͑PECVD͒, 5 and sputtering. 6 More recently, self-limiting growth techniques such as atomic layer deposition have been introduced to provide digital control. 7,8 Our group has recently developed both plasma-enhanced atomic layer deposition ͑PEALD͒ 9 and pulsed PECVD 10 processes for the synthesis of titania at low temperature ͑Յ200°C͒ using TiCl 4 and O 2 . In PEALD, perfect conformality is achieved, allowing uniform deposition on complex topographies. The resulting films produced by both techniques displayed a polycrystalline anatase morphology with no detectable chlorine impurities. 9,10 In this work we focus on the photoelectrochemical properties of these films and compare their performance with that of TiO 2 films deposited by other techniques. Photoanodes were formed by depositing TiO 2 on glass coated with transparent conducting oxides ͑TCOs͒. In particular, we systematically explore electrochemical doping using cathodic polarization as a means to control the carrier concentration and enhance the photoresponse. In addition, the role of the underlying TCO contact was evaluated by comparing photoanodes produced with indium tin oxide ͑ITO͒ and fluorinated tin oxide ͑FTO͒. ExperimentalTiO 2 thin films were deposited on TCO-coated glass by both PEALD and pulsed PECVD. Details on the two deposition processes are found in the literature. 9,10 In all cases, the deposition temperature was T = 200°C. Thin ͑70 nm͒ and thick ͑255 nm͒ sets of films were produced to explore the effect of film thickness. Film thickness was determined by spectroscopic ellipsometry ͑J. A. Woollam͒. Most of the results presented below were achieved with pulsed PECVD films, but nominally identical results were obtained with PEALD films. The two TCOs employed were commercial FTO ͑Libby-Owens-Ford, R s ϳ 10 ⍀/ᮀ͒ or 200 nm thick ITO layers that were sputtered in...

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Section: D434supporting

confidence: 85%

Photoelectrochemical Performance of Anatase TiO[sub 2] Thin Films Deposited by Self-Limiting Growth Techniques

Wang

Kubala

Wolden

2010

J. Electrochem. Soc.

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“…ITO and undoped tin oxide (not shown). It has been reported that ITO surface undergoes substantial changes in its properties on potentiodynamic stress in the acidic pH range [28], but FTO does not experience such deterioration and presents high stability in acid medium. Thus, the potential and acidic pH range used in this work can upset for LA detection on these electrodes.…”

Section: Resultsmentioning

confidence: 99%

Use of fluorine-doped tin oxide electrodes for lipoic acid determination in dietary supplements

Miranda

Rio

Valle

et al. 2012

Journal of Electroanalytical Chemistry

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“…Although the SWp electrodes show narrower working potential window if compared to ITO, they are still functional for most of electrochemical measurements, that usually are done between -0.2 and 1.0 V (vs. Ag/AgCl) [68]. Also, the electrodes are stable to be work at the entire range of pH, which represent an additional advantage, once it is well known that ITO are not stable at acidic pH [69].…”

Section: Electrochemical Performancementioning

confidence: 99%

Flexible, Transparent and Thin Films of Carbon Nanomaterials as Electrodes for Electrochemical Applications

Souza

Husmann

Neiva

et al. 2016

Electrochimica Acta

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Electrochemical instability of indium tin oxide (ITO) glass in acidic pH range during cathodic polarization

Cited by 86 publications

References 15 publications

Photoelectrochemical Performance of Anatase TiO[sub 2] Thin Films Deposited by Self-Limiting Growth Techniques

Photoelectrochemical Performance of Anatase TiO[sub 2] Thin Films Deposited by Self-Limiting Growth Techniques

Use of fluorine-doped tin oxide electrodes for lipoic acid determination in dietary supplements

Flexible, Transparent and Thin Films of Carbon Nanomaterials as Electrodes for Electrochemical Applications

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