1

Supporting information

Ti-doped SrFeO3 nanostructured electrodes for Symmetric Solid Oxide Fuel Cells

L. dos Santos-Gómeza, J. M. Porras-Vázqueza, E. R. Losillaa, D. Marrero-Lópezb,*

a Universidad de Málaga, Departamento de Química Inorgánica, 29071-Málaga, Spain.b Universidad de Málaga, Departamento de Física Aplicada I, Laboratorio de Materiales y

Superficie, 29071-Málaga, Spain.

Electronic Supplementary Material (ESI) for RSC Advances.This journal is © The Royal Society of Chemistry 2015

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Figure S1. XRD patterns of Sr0.98FeO3- films prepared by spray-pyrolysis and different precursor solutions.

10 20 30 40 50 60 70 80

2 / º

nitrates

acetates

nitrates+EDTA

SrFeO3-SrFe12O19SrCO3Unidentified

***

*

*

Figure S2. Unit cell volume for SrFe1-xTixO3-series prepared in form of films by spray-pyrolysis (SP) at 650 ºC and powder by freeze-drying precursors (FD) at 1100 ºC.

0.0 0.2 0.4 0.6 0.8 1.057.5

58.0

58.5

59.0

59.5

60.0

SP FD

V / Å

3

x

SrFe1-xTixO3-

3

Figure S3. Rietveld plot of Sr0.98Fe0.8Ti0.2O3- deposited by spray-pyrolysis on CGO backbone after thermal treatment in air at 800 ºC for 2 h.

20 30 40 50 60 70 80

CGO SFT0.2

2/ º

Figure S4. XRD patterns of Sr0.98Fe0.8Ti0.2O3- deposited by spray-pyrolysis on CGO backbone after annealing in air and humidified 5%H2-Ar at 750ºC for 12 h.

20 30 40 50 60 70 80

humidified 5%H2-Ar

2/ º

air

CGOSFT0.2

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Figure S5. SEM micrograph of SrFe0.8Ti0.2O3--CGO electrodes prepared by freeze-drying precursor and deposited by screen-printing at 1100 ºC for 1 h.

10 µm

Figure S6. Cross-section micrograph of the symmetrical cell, SFT0.2-CGO/LSGM/SFTi0.2-CGO, in different regions.

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Table S1. Rp values and maximum power densities for different symmetrical electrodes using H2 as fuel. Only redox stable electrodes are included.

Electrode Electrolyte Rpair

( cm2)Rp

5%H2

( cm2) P(mWcm-2) Ref.

Sr0.98Fe0.8Ti0.2O3-δ (SP) LSGM0.04

(750 ºC)0.18

(750 ºC)700

(800 ºC)This work

Sr0.98Fe0.8Ti0.2O3-δ + 50% CGO (FD)

LSGM0.32

(750 ºC)1.15

(750 ºC)--

This work

SrFe0.75Zr0.25O3-δ + 50% CGO LSGM0.10

(750 ºC)0.17

(750 ºC)425

(800 ºC)[27]

Sr2Fe1.5Mo0.5O6-δ LSGM0.24

(780 ºC)0.27

(780 ºC)500

(800 ºC)[9]

La0.75Sr0.25Cr0.5Mn0.5O3-δ + YSZ YSZ0.60

(750 ºC)1.30

(750 ºC)550

(950 ºC)[4]

La0.7Ca0.3Cr0.97O3-δ:YSZ (1:1) YSZ0.16

(850 ºC)2.00

(850 ºC)50.7

(800 ºC)[7]

La0.4Sr0.6Co0.2Fe0.7Nb0.1O3- LSGM0.1

(800 ºC)0.28

(800 ºC)380

(800 ºC)[17]

La1/3Sr2/3(Ti1-xFex)O3±δ YSZ0.6

(950 ºC)3.0

(950 ºC)90

(950 ºC)[10]

La0.8Sr0.2Sc0.2Mn0.8O3 SSZ6.5

(850 ºC)0.35

(850 ºC)220

(850ºC)[8]

La0.6Sr0.4Fe0.9Sc0.1O3-δ LSGM0.015

(800 ºC)0.29

(800 ºC)560

(800 ºC)[13]

La0.6Sr1.4MnO4-δ LSGM2.06

(750 ºC)5.25

(750 ºC)600

(800 ºC)[15]

La0.75Sr0.25Cr0.5Mn0.5O3-δ (infiltration)

YSZ -- --200

(800 ºC)[30]