Hematite Photoanode with Complex Nanoarchitecture Providing Tunable Gradient Doping and Low Onset Potential for Photoelectrochemical Water Splitting.
ChemSusChem
; 11(11): 1873-1879, 2018 Jun 11.
Article
em En
| MEDLINE
| ID: mdl-29644796
ABSTRACT
Over the past years, α-Fe2 O3 (hematite) has re-emerged as a promising photoanode material in photoelectrochemical (PEC) water splitting. In spite of considerable success in obtaining relatively high solar conversion efficiency, the main drawbacks hindering practical application of hematite are its intrinsically hampered charge transport and sluggish oxygen evolution reaction (OER) kinetics on the photoelectrode surface. In the present work, we report a strategy that synergistically addresses both of these critical limitations. Our approach is based on three key features that are applied simultaneously i)â
a careful nanostructuring of the hematite photoanode in the form of nanorods, ii)â
doping of hematite by Sn4+ ions using a controlled gradient, and iii)â
surface decoration of hematite by a new class of layered double hydroxide (LDH) OER co-catalysts based on Zn-Coâ
LDH. All three interconnected forms of functionalization result in an extraordinary cathodic shift of the photocurrent onset potential by more than 300â
mV and a PEC performance that reaches a photocurrent density of 2.00â
mA cm-2 at 1.50â
V vs. the reversible hydrogen electrode.
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Coleções:
01-internacional
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MEDLINE
Idioma:
En
Ano de publicação:
2018
Tipo de documento:
Article