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Scalable one-step assembly of an inexpensive photoelectrode for water oxidation by deposition of a Ti- and Ni-containing molecular precursor on nanostructured WO3.

Lai YH, King TC, Wright DS, Reisner E - Chemistry (2013)

Bottom Line: Photoactive in one step!A nanocomposite water-oxidation photocatalyst was assembled by a straightforward and one-step spin-coating procedure of a Ti- and Ni-containing molecule on nanostructured WO3.The photoanode oxidizes water to O2 with good activity and stability in alkaline solution, and thereby features light absorption, charge separation and water-oxidation catalysis (see scheme).

View Article: PubMed Central - PubMed

Affiliation: Christian Doppler Laboratory for Sustainable SynGas Chemistry, Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW (UK).

No MeSH data available.


Related in: MedlinePlus

Chronoamperometric measurements a) at 1.23 and b) 0.94 V versus RHE in a pH 9.2 Bi buffer. Photocurrent profiles of i) nanoWO3, ii) nanoWO3/TiNi, iii) nanoWO3/Ni(NO3)2 and iv) nanoWO3/[Ti(OiPr)4] under standardized solar-light irradiation (AM 1.5 G, 100 mW cm−2) are shown.
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fig03: Chronoamperometric measurements a) at 1.23 and b) 0.94 V versus RHE in a pH 9.2 Bi buffer. Photocurrent profiles of i) nanoWO3, ii) nanoWO3/TiNi, iii) nanoWO3/Ni(NO3)2 and iv) nanoWO3/[Ti(OiPr)4] under standardized solar-light irradiation (AM 1.5 G, 100 mW cm−2) are shown.

Mentions: Photocurrents were measured in a three-electrode configuration with a platinum foil counterelectrode and a Ag/AgCl/KCl(sat) reference electrode at RT, using standardized solar-light irradiation (AM 1.5G, 100 mW cm−2). In pH 9.2 Bi solution (0.1 m) at an applied potential of 0.94 and 1.23 V versus RHE, bare nanoWO3 showed an initial photocurrent of 131 and 430 μA cm−2 with 28±1 and 10±2 % of the photocurrent remaining after 1 h, respectively (Figure 3). An increasing number of TiNi deposition cycles (N) resulted in enhanced photostability with 73±3 and 58±3 % of the photocurrent remaining after 1 h continuous irradiation with N=4 at 0.94 and 1.23 V versus RHE, respectively (Figures 3 and S5–S6 in the Supporting Information). A half-life time of more than 4 h was found at an applied potential of 0.94 V versus RHE in pH 9.2 Bi solution in the case of nanoWO3/TiNi (Figure S7 in the Supporting Information), whereas nanoWO3 had lost 50 % of its photoactivity after 35 min. Control experiments involving spin coating Ni(NO3)2 in 2-methoxyethanol (nanoWO3/Ni(NO3)2, 30 μL, 10 mm) and titanium isopropoxide, [Ti(OiPr)4] in toluene (30 μL, 20 mm) on nanoWO3 (nanoWO3/[Ti(OiPr)4]) resulted in stabilities between those for bare nanoWO3 and nanoWO3/TiNi electrodes. This observation demonstrates that NiOx acts as an electrocatalyst and TiO2 provides a protective layer (Figures 3 a and S5 in the Supporting Information). The same general trend was also observed in a pH 8.2 Bi electrolyte solution (Figure S8 in the Supporting Information).


Scalable one-step assembly of an inexpensive photoelectrode for water oxidation by deposition of a Ti- and Ni-containing molecular precursor on nanostructured WO3.

Lai YH, King TC, Wright DS, Reisner E - Chemistry (2013)

Chronoamperometric measurements a) at 1.23 and b) 0.94 V versus RHE in a pH 9.2 Bi buffer. Photocurrent profiles of i) nanoWO3, ii) nanoWO3/TiNi, iii) nanoWO3/Ni(NO3)2 and iv) nanoWO3/[Ti(OiPr)4] under standardized solar-light irradiation (AM 1.5 G, 100 mW cm−2) are shown.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3814423&req=5

fig03: Chronoamperometric measurements a) at 1.23 and b) 0.94 V versus RHE in a pH 9.2 Bi buffer. Photocurrent profiles of i) nanoWO3, ii) nanoWO3/TiNi, iii) nanoWO3/Ni(NO3)2 and iv) nanoWO3/[Ti(OiPr)4] under standardized solar-light irradiation (AM 1.5 G, 100 mW cm−2) are shown.
Mentions: Photocurrents were measured in a three-electrode configuration with a platinum foil counterelectrode and a Ag/AgCl/KCl(sat) reference electrode at RT, using standardized solar-light irradiation (AM 1.5G, 100 mW cm−2). In pH 9.2 Bi solution (0.1 m) at an applied potential of 0.94 and 1.23 V versus RHE, bare nanoWO3 showed an initial photocurrent of 131 and 430 μA cm−2 with 28±1 and 10±2 % of the photocurrent remaining after 1 h, respectively (Figure 3). An increasing number of TiNi deposition cycles (N) resulted in enhanced photostability with 73±3 and 58±3 % of the photocurrent remaining after 1 h continuous irradiation with N=4 at 0.94 and 1.23 V versus RHE, respectively (Figures 3 and S5–S6 in the Supporting Information). A half-life time of more than 4 h was found at an applied potential of 0.94 V versus RHE in pH 9.2 Bi solution in the case of nanoWO3/TiNi (Figure S7 in the Supporting Information), whereas nanoWO3 had lost 50 % of its photoactivity after 35 min. Control experiments involving spin coating Ni(NO3)2 in 2-methoxyethanol (nanoWO3/Ni(NO3)2, 30 μL, 10 mm) and titanium isopropoxide, [Ti(OiPr)4] in toluene (30 μL, 20 mm) on nanoWO3 (nanoWO3/[Ti(OiPr)4]) resulted in stabilities between those for bare nanoWO3 and nanoWO3/TiNi electrodes. This observation demonstrates that NiOx acts as an electrocatalyst and TiO2 provides a protective layer (Figures 3 a and S5 in the Supporting Information). The same general trend was also observed in a pH 8.2 Bi electrolyte solution (Figure S8 in the Supporting Information).

Bottom Line: Photoactive in one step!A nanocomposite water-oxidation photocatalyst was assembled by a straightforward and one-step spin-coating procedure of a Ti- and Ni-containing molecule on nanostructured WO3.The photoanode oxidizes water to O2 with good activity and stability in alkaline solution, and thereby features light absorption, charge separation and water-oxidation catalysis (see scheme).

View Article: PubMed Central - PubMed

Affiliation: Christian Doppler Laboratory for Sustainable SynGas Chemistry, Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW (UK).

No MeSH data available.


Related in: MedlinePlus