Abstract
Solar water splitting in acidic solutions has important technological implications, but has not been demonstrated to date in a dual absorber photoelectrochemical cell. The lack of functionally stable water-oxidation catalysts (WOCs) in acids is a key reason for this slow development. The only WOCs that are stable at low pH are Ir-based systems, which are typically too expensive to be implemented broadly. It is now shown that this deficiency may be corrected by applying an ultra-thin monolayer of a molecular Ir WOC to hematite for solar water splitting in acidic solutions. The turn-on voltage is observed to shift cathodically by 250 mV upon the application of a monolayer of the molecular Ir WOC. When the molecular WOC is replaced by a heterogeneous multilayer derivative, stable solar water splitting for over 5 h is achieved with near-unity Faradaic efficiency.
| Original language | English |
|---|---|
| Pages (from-to) | 11428-11432 |
| Number of pages | 5 |
| Journal | Angewandte Chemie - International Edition |
| Volume | 54 |
| Issue number | 39 |
| DOIs | |
| Publication status | Published - Sep 1 2015 |
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Keywords
- hematite
- homogeneous catalysis
- iridium
- photoelectrochemistry
- solar water splitting
ASJC Scopus subject areas
- Chemistry(all)
- Catalysis
Cite this
Hematite-Based Solar Water Splitting in Acidic Solutions : Functionalization by Mono- and Multilayers of Iridium Oxygen-Evolution Catalysts. / Li, Wei; Sheehan, Stafford W.; He, Da; He, Yumin; Yao, Xiahui; Grimm, Ronald L.; Brudvig, Gary W; Wang, Dunwei.
In: Angewandte Chemie - International Edition, Vol. 54, No. 39, 01.09.2015, p. 11428-11432.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Hematite-Based Solar Water Splitting in Acidic Solutions
T2 - Functionalization by Mono- and Multilayers of Iridium Oxygen-Evolution Catalysts
AU - Li, Wei
AU - Sheehan, Stafford W.
AU - He, Da
AU - He, Yumin
AU - Yao, Xiahui
AU - Grimm, Ronald L.
AU - Brudvig, Gary W
AU - Wang, Dunwei
PY - 2015/9/1
Y1 - 2015/9/1
N2 - Solar water splitting in acidic solutions has important technological implications, but has not been demonstrated to date in a dual absorber photoelectrochemical cell. The lack of functionally stable water-oxidation catalysts (WOCs) in acids is a key reason for this slow development. The only WOCs that are stable at low pH are Ir-based systems, which are typically too expensive to be implemented broadly. It is now shown that this deficiency may be corrected by applying an ultra-thin monolayer of a molecular Ir WOC to hematite for solar water splitting in acidic solutions. The turn-on voltage is observed to shift cathodically by 250 mV upon the application of a monolayer of the molecular Ir WOC. When the molecular WOC is replaced by a heterogeneous multilayer derivative, stable solar water splitting for over 5 h is achieved with near-unity Faradaic efficiency.
AB - Solar water splitting in acidic solutions has important technological implications, but has not been demonstrated to date in a dual absorber photoelectrochemical cell. The lack of functionally stable water-oxidation catalysts (WOCs) in acids is a key reason for this slow development. The only WOCs that are stable at low pH are Ir-based systems, which are typically too expensive to be implemented broadly. It is now shown that this deficiency may be corrected by applying an ultra-thin monolayer of a molecular Ir WOC to hematite for solar water splitting in acidic solutions. The turn-on voltage is observed to shift cathodically by 250 mV upon the application of a monolayer of the molecular Ir WOC. When the molecular WOC is replaced by a heterogeneous multilayer derivative, stable solar water splitting for over 5 h is achieved with near-unity Faradaic efficiency.
KW - hematite
KW - homogeneous catalysis
KW - iridium
KW - photoelectrochemistry
KW - solar water splitting
UR - http://www.scopus.com/inward/record.url?scp=84942134166&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84942134166&partnerID=8YFLogxK
U2 - 10.1002/anie.201504427
DO - 10.1002/anie.201504427
M3 - Article
VL - 54
SP - 11428
EP - 11432
JO - Angewandte Chemie - International Edition
JF - Angewandte Chemie - International Edition
SN - 1433-7851
IS - 39
ER -