Synthesis of active electrocatalysts using glycine-nitrate chemistry

abstract

Due to sluggish oxygen reduction reactions, development in the solid oxide fuel cell (SOFC) field is stagnant. Two solutions, increasing the active surface or use of precious materials, can stimulate the oxygen reduction kinetics on electrodes. Thus, to gain both these benefits, the present article addressed the synthesis of high surface-area mixed oxide ionic-electronic conductor La0.6Sr0.4Co0.8Fe0.2O3-delta (LSCF) using chemistry of the propellant glycine-nitrate reaction. In this study, different fuel to oxidant ratios (psi), 2.0, 2.6, and 3.0 were used to control the exothermicity of reaction and powder properties. The maximum reaction temperature of 1337 K at psi = 3.0 resulted in coarsened powder. In contrast, comparatively less exothermicity of reaction at psi = 2.0 resulted in powder with substantial Brunauer-Emmett-Teller surface area of 10.97 m(2) g(-1), with maximum powder compaction achieved at sintering of 1273 K. With optimal direct current in-plane electrical conductivity of 341 S cm(-1), H-2-temperature-programmed reduction showed excellent catalytic activity for the sample obtained at psi = 2.0. The electrochemical performance comparisons of electrodes in two different cell geometries - with and without a gold catalytic current collecting layer (Au-CCCL) - revealed the least polarization and cell resistance in the cell with Au-CCCL. The electrode area specific resistance and cell conductivity using Au-CCCL were 0.097 Omega cm(-2) and 0.15 S cm(-1), respectively.

keywords

OXIDE FUEL-CELL; SOLUTION COMBUSTION SYNTHESIS; SOLID-STATE CELLS; ELECTROCHEMICAL PERFORMANCE; OXYGEN REDUCTION; WORK FUNCTION; NANOPARTICLES; TEMPERATURE; CATHODES; SIZE

subject category

Chemistry, Multidisciplinary; Physics, Condensed Matter

authors

Jamale, AP; Natoli, A; Jadhav, LD

our authors

acknowledgements

This work was funded by projects CO2ZERO (POCI-01-0145-FEDER016654-PTDC/CTM-CER/6732/2014), MOCO3-(M-ERA.NET2 2016MOCO3-0009/2016), and CICECO-Aveiro Institute of Materials, UIDB/50011/2020 and UIDP/50011/2020, financed by national funds through FCT (Fundacao para a Ciencia e a Tecnologia)/MCTES, and when applicable co-financed by FEDER under the COMPETE 2020 Program. Specific support (AJ) provided by national funds (OE), through FCT, IP, in the scope of the framework contract foreseen in the numbers 4, 5, and 6 of the article 23, of the Decree-Law 57/2016, of August 29, changed by Law 57/2017, of July 19.

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