TY - JOUR
T1 - Photo-assisted charge/discharge of a secondary cell of α-Fe2O3/Prussian blue–based electrodes
AU - Rojas, Víctor
AU - López, Silvana
AU - Cáceres, Gustavo
AU - Schrebler, Ricardo G.
AU - Grez, Paula
AU - Henríquez, Rodrigo
AU - Ballesteros, Luis
AU - Navarrete, Emilio
AU - Herrera, Francisco
AU - Muñoz, Eduardo C.
N1 - Funding Information:
This study was financially supported by FONDECYT, Chile (grant no. 1180784) and by VRIEA-PUCV (grant no. 039.438 NÚCLEO-PUCV and 125.728/2018 DII-PUCV). E. Navarrete thanks the postdoctoral project FONDECYT (no. 3200216) for financial support. V. Rojas and S. López received doctoral scholarship from ANID.
Publisher Copyright:
© 2021, The Author(s), under exclusive licence to Springer-Verlag GmbH, DE part of Springer Nature.
PY - 2021/4
Y1 - 2021/4
N2 - In this work, an assembly of FTO/α-Fe2O3/PB|M+ electrolyte|PB/α-Fe2O3/FTO (M+ = Li+, Na+, K+) secondary photocell was done to improve the charge capacity in the presence of illumination. Our previous results with these electrodes demonstrated the possibility of transferring photogenerated carriers from hematite to Prussian blue. This cell was characterized by incident photon-to-current efficiency (IPCE) and galvanostatic charge/discharge measurements under illumination and compared in darkness. A higher IPCE when potassium ions are employed in the cell was founded, which suggests an easy insertion/desertion of these ions inside/outside of the hexacyanometallate framework, related to the more compact water coordination sphere for this ion. The voltage cell increased when the system was charged under illumination, indicating an increase in the oxidation/reduction of iron centers in the hexacyanometallate structure due to the increase of photogenerated carriers in hematite. The cell’s specific capacity reaches around 12% of the theoretical capacity, with a voltage close to the theoretical (1.5 V) and about 95% of coulombic efficiency when the cell was charged and discharged at longer times (8 h).
AB - In this work, an assembly of FTO/α-Fe2O3/PB|M+ electrolyte|PB/α-Fe2O3/FTO (M+ = Li+, Na+, K+) secondary photocell was done to improve the charge capacity in the presence of illumination. Our previous results with these electrodes demonstrated the possibility of transferring photogenerated carriers from hematite to Prussian blue. This cell was characterized by incident photon-to-current efficiency (IPCE) and galvanostatic charge/discharge measurements under illumination and compared in darkness. A higher IPCE when potassium ions are employed in the cell was founded, which suggests an easy insertion/desertion of these ions inside/outside of the hexacyanometallate framework, related to the more compact water coordination sphere for this ion. The voltage cell increased when the system was charged under illumination, indicating an increase in the oxidation/reduction of iron centers in the hexacyanometallate structure due to the increase of photogenerated carriers in hematite. The cell’s specific capacity reaches around 12% of the theoretical capacity, with a voltage close to the theoretical (1.5 V) and about 95% of coulombic efficiency when the cell was charged and discharged at longer times (8 h).
KW - Charge/discharge
KW - Photocell
KW - Photoelectrochemistry
KW - Prussian blue
KW - α-FeO semiconductor
UR - http://www.scopus.com/inward/record.url?scp=85099095128&partnerID=8YFLogxK
U2 - 10.1007/s10008-020-04888-5
DO - 10.1007/s10008-020-04888-5
M3 - Article
AN - SCOPUS:85099095128
VL - 25
SP - 1131
EP - 1138
JO - Journal of Solid State Electrochemistry
JF - Journal of Solid State Electrochemistry
SN - 1432-8488
IS - 4
ER -