<abstract xmlns="http://www.w3.org/1999/xhtml">NiO–Al2O3 nanocomposite has been synthesized by mixing combustion synthesized powders. The nanocomposite is an effective anode/anode functional layer for intermediate temperature solid oxide fuel cells. The TEM of NiO and Al2O3 revealed spherical particles of 30 nm and platelets of 70 nm, respectively. The XRD analysis of NiO–Al2O3 composite sintered at 900 °C showed presence of cubic NiO and rhombohedral α-Al2O3 which were chemically stable. However, above 1200 °C NiAl2O4 started to appear. The conductivity of NiO–Al2O3 was the highest in hydrogen (4.3 × 10–3 S/cm at 600 °C). In biogas, the conductivity was 3.2 × 10–3 S/cm with the activation energy of 0.67 eV. The stability of the composite in biogas was also examined.</abstract>

NiO–Al2O3 nanocomposite has been synthesized by mixing combustion synthesized powders. The nanocomposite is an effective anode/anode functional layer for intermediate temperature solid oxide fuel cells. The TEM of NiO and Al2O3 revealed spherical particles of 30 nm and platelets of 70 nm, respectively. The XRD analysis of NiO–Al2O3 composite sintered at 900 °C showed presence of cubic NiO and rhombohedral α-Al2O3 which were chemically stable. However, above 1200 °C NiAl2O4 started to appear. The conductivity of NiO–Al2O3 was the highest in hydrogen (4.3 × 10–3 S/cm at 600 °C). In biogas, the conductivity was 3.2 × 10–3 S/cm with the activation energy of 0.67 eV. The stability of the composite in biogas was also examined.

Characterization of NiO–Al2O3 composite and its conductivity in biogas for solid oxide fuel cell

Department of Physics, Shivaji University, Kolhapur, India-416004

Electrochemical Energy Materials Laboratory, Department of Physics, Rajaram College, Kolhapur, India-416004

Catalan Institute of Nanoscience and Nanotechnology, Campus UAB, Spain

Materials Science-Poland

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Characterization of NiO–AlO composite and its conductivity in biogas for solid oxide fuel cell

NiO–Al2O3 nanocomposite has been synthesized by mixing combustion synthesized powders. The nanocomposite is an effective anode/anode functional layer for...

Materials	Atmosphere	Conductivity [S/cm] × 10–3	Activation energy [eV] 400 °C to 610 °C
NiO–Al₂O₃	Air	Biogas	Hydrogen
	0.97	3.2	4.3
	0.88	0.67	0.23

Atomic % of NiO	Ni 54.43
	O 45.57
Atomic % of Al₂O₃	Al 37.90
	O 62.10

Material NiO–Al₂O₃ nanocomposite	Lattice parameter [Å]			Crystallite size [nm]
	NiO	α-Al₂O₃
	a	a = b	c	NiO	α-Al₂O₃
Standard data	4.17	4.75	12.99
Sintered at 900 °C	4.15	4.75	12.85	34	35
Sintered at 1200 °C	4.15	4.76	12.88	37	37

Compound	DH_f [Kcal/mol]	Cp [Kcal/mol K] at 298 K
Ni(NO₃)₂ 6H₂O	–528.6	–
Al(NO₃)₃ 9H₂O	–857.59	–
C₂H₅NO₂	–126.22	–
NiO	–57.3	0.01059
α-Al₂O₃	–399.09	0.01889
CO₂	–94.05	0.00887
N₂	–	0.00696
H₂O	–57.97	0.00803
O₂	–	0.00701
Adiabatic flame temperature of NiO		978 °C
Adiabatic flame temperature of α-Al₂O₃		1323 °C

Characterization of NiO–Al₂O₃ composite and its conductivity in biogas for solid oxide fuel cell

Article Category: Research Article

Published Online: May 09, 2016

Page range: 266 - 274

Received: Apr 24, 2015

Accepted: Feb 17, 2015

DOI: https://doi.org/10.1515/msp-2016-0045

Keywords
oxides, chemical synthesis, X-ray diffraction, electrical conductivity, microstructure

© 2016 Wroclaw University of Technology

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Fig. 1

Fig. 2

Fig. 3

Fig. 4

Fig. 5

Fig. 6

Fig. 7

Fig. 8

DC conductivity and activation energy values in different atmospheres.

Elemental analysis of NiO and Al2O3.

The lattice parameters and crystallite size of NiO and α-Al2O3 phases in the composite.

Calculations of adiabatic flame temperature.

Characterization of NiO–Al2O3 composite and its conductivity in biogas for solid oxide fuel cell

Article Category: Research Article

Published Online: May 09, 2016

Page range: 266 - 274

Received: Apr 24, 2015

Accepted: Feb 17, 2015

DOI: https://doi.org/10.1515/msp-2016-0045

Keywordsoxides, chemical synthesis, X-ray diffraction, electrical conductivity, microstructure

© 2016 Wroclaw University of Technology

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Fig. 1

Fig. 2

Fig. 3

Fig. 4

Fig. 5

Fig. 6

Fig. 7

Fig. 8

DC conductivity and activation energy values in different atmospheres.

Elemental analysis of NiO and Al2O3.

The lattice parameters and crystallite size of NiO and α-Al2O3 phases in the composite.

Calculations of adiabatic flame temperature.

Characterization of NiO–Al₂O₃ composite and its conductivity in biogas for solid oxide fuel cell

Keywords
oxides, chemical synthesis, X-ray diffraction, electrical conductivity, microstructure