TY  - JOUR
AU  - Tang, Peng‐Yi
AU  - Han, Li‐Juan
AU  - Hegner, Franziska Simone
AU  - Paciok, Paul
AU  - Biset‐Peiró, Martí
AU  - Du, Hong‐Chu
AU  - Wei, Xian‐Kui
AU  - Jin, Lei
AU  - Xie, Hai‐Bing
AU  - Shi, Qin
AU  - Andreu, Teresa
AU  - Lira‐Cantú, Mónica
AU  - Heggen, Marc
AU  - Dunin‐Borkowski, Rafal E.
AU  - López, Núria
AU  - Galán‐Mascarós, José Ramón
AU  - Morante, Joan Ramon
AU  - Arbiol, Jordi
TI  - Boosting Photoelectrochemical Water Oxidation of Hematite in Acidic Electrolytes by Surface State Modification5
JO  - Advanced energy materials
VL  - 9
IS  - 34
SN  - 1614-6840
CY  - Weinheim
PB  - Wiley-VCH
M1  - FZJ-2020-02775
SP  - 1901836 -
PY  - 2019
AB  - State‐of‐the‐art water‐oxidation catalysts (WOCs) in acidic electrolytes usually contain expensive noble metals such as ruthenium and iridium. However, they too expensive to be implemented broadly in semiconductor photoanodes for photoelectrochemical (PEC) water splitting devices. Here, an Earth‐abundant CoFe Prussian blue analogue (CoFe‐PBA) is incorporated with core–shell Fe2O3/Fe2TiO5 type II heterojunction nanowires as composite photoanodes for PEC water splitting. Those deliver a high photocurrent of 1.25 mA cm−2 at 1.23 V versus reversible reference electrode in acidic electrolytes (pH = 1). The enhancement arises from the synergic behavior between the successive decoration of the hematite surface with nanolayers of Fe2TiO5 and then, CoFe‐PBA. The underlying physical mechanism of performance enhancement through formation of the Fe2O3/Fe2TiO5/CoFe‐PBA heterostructure reveals that the surface states’ electronic levels of hematite are modified such that an interfacial charge transfer becomes kinetically favorable. These findings open new pathways for the future design of cheap and efficient hematite‐based photoanodes in acidic electrolytes.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000484080400001
DO  - DOI:10.1002/aenm.201901836
UR  - https://juser.fz-juelich.de/record/878319
ER  -