Photoassisted electrolysis of water using single crystal α-Fe2O3 anodes

Quinn, Rod K.; Nasby, R.D.; Baughman, R.J.

doi:10.1016/0025-5408(76)90178-1

Cited by 189 publications

(93 citation statements)

References 13 publications

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“…Similar behavior has been observed in alkaline media for metal oxides such as Fe 2 O 3 , [8][9][10][11] which have smaller band gaps than TiO 2 and thus absorb more of the visible region of the solar spectrum. The photoelectrochemical behavior of such systems is consistent with the hypothesis that the valence band of these metal oxides is predominantly O 2p in character, resulting in a similar potential of the valence band edge for all of these metal oxides.…”

Section: Introductionsupporting

confidence: 71%

A quantitative assessment of the competition between water and anion oxidation at WO3 photoanodes in acidic aqueous electrolytes

Zhanaidarova

Brunschwig

et al. 2012

Energy Environ. Sci.

283

290

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The faradaic efficiency for O 2 (g) evolution at thin-film WO 3 photoanodes has been evaluated in a series of acidic aqueous electrolytes. In 1.0 M H 2 SO 4 , persulfate was the predominant photoelectrochemical oxidation product, and no O 2 was detected unless catalytic quantities of Ag + (aq) were added to the electrolyte. In contact with 1.0 M HClO 4 , dissolved O 2 was observed with nearly unity faradaic efficiency, but addition of a hole scavenger, 4-cyanopyridine N-oxide, completely suppressed O 2 formation. In 1.0 M HCl, Cl 2 (g) was the primary oxidation product. These results indicate that at WO 3 photoanodes, water oxidation is dominated by oxidation of the acid anions in 1.0 M HCl, H 2 SO 4 , and HClO 4 , respectively.

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Section: Introductionsupporting

confidence: 71%

A quantitative assessment of the competition between water and anion oxidation at WO3 photoanodes in acidic aqueous electrolytes

Zhanaidarova

Brunschwig

et al. 2012

Energy Environ. Sci.

283

290

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“…Note that the low donor concentration in our crystals means that s 0 is significantly smaller than that for intrinsic small-polaron hopping. 48,49 Below T M , both E s and s 0 T increased significantly (Table 1 and Fig. 7).…”

Section: Electronic Transportmentioning

confidence: 85%

Synthesis, electronic transport and optical properties of Si:α-Fe₂O₃ single crystals

et al. 2016

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We report the synthesis of silicon-doped hematite (Si:a-Fe 2 O 3 ) single crystals via chemical vapor transport, with Si incorporation on the order of 10 19 cm À3. The conductivity, Seebeck and Hall effect were measured in the basal plane between 200 and 400 K. Distinct differences in electron transport were observed above and below the magnetic transition temperature of hematite at B265 K (the Morin transition, T M ). Above 265 K, transport was found to agree with the adiabatic small-polaron model, the conductivity was characterized by an activation energy of B100 meV and the Hall effect was dominated by the weak ferromagnetism of the material. A room temperature electron drift mobility of B10 À2 cm 2 V À1 s À1was estimated. Below T M , the activation energy increased to B160 meV and a conventional Hall coefficient could be determined. In this regime, the Hall coefficient was negative and the corresponding Hall mobility was temperature-independent with a value of B10 À1 cm 2 V À1 s À1. Seebeck coefficient measurements indicated that the silicon donors were fully ionized in the temperature range studied. Finally, we observed a broad infrared absorption upon doping and tentatively assign the feature at B0.8 eV to photon-assisted small-polaron hops. These results are discussed in the context of existing hematite transport studies.

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“…The idea of using a single crystal as an electrode goes back several decades to when Quinn et al [46] measured the current and voltage from an electrode made from a hematite single crystal. The first single crystal electrode, constructed for the purpose of surface potential evaluation, was the "ice electrode".…”

Section: Single Crystal Electrodementioning

confidence: 99%

The Effects on the Response of Metal Oxide and Fluorite Single Crystal Electrodes and the Equilibration Process in the Interfacial Region

Preočanin¹,

Namjesnik²,

Klačić³

et al. 2017

Croat. Chem. Acta

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Inner surface potential, one of the most important variables affecting the interfacial equilibrium of metal oxide aqueous systems, obtained by means of single crystal electrode gives valuable information about electrical charging of the metal oxide/aqueous electrolyte solution interfaces. The influence of the potential determining ions and ionic strength on the measured electrode potential as well as time of the equilibration, direction of the titration and the effect of the magnetic stirring enables the critical examination of the processes which take place during the interfacial equilibrium. For that purpose, the selected metal oxides (hematite, ceria, sapphire, and rutile) and fluorite single crystal electrodes were examined.

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Photoassisted electrolysis of water using single crystal α-Fe2O3 anodes

Cited by 189 publications

References 13 publications

A quantitative assessment of the competition between water and anion oxidation at WO3 photoanodes in acidic aqueous electrolytes

A quantitative assessment of the competition between water and anion oxidation at WO3 photoanodes in acidic aqueous electrolytes

Synthesis, electronic transport and optical properties of Si:α-Fe₂O₃ single crystals

The Effects on the Response of Metal Oxide and Fluorite Single Crystal Electrodes and the Equilibration Process in the Interfacial Region

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Photoassisted electrolysis of water using single crystal α-Fe2O3 anodes

Cited by 189 publications

References 13 publications

A quantitative assessment of the competition between water and anion oxidation at WO3 photoanodes in acidic aqueous electrolytes

A quantitative assessment of the competition between water and anion oxidation at WO3 photoanodes in acidic aqueous electrolytes

Synthesis, electronic transport and optical properties of Si:α-Fe2O3 single crystals

The Effects on the Response of Metal Oxide and Fluorite Single Crystal Electrodes and the Equilibration Process in the Interfacial Region

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Synthesis, electronic transport and optical properties of Si:α-Fe₂O₃ single crystals