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Electrocatalytic Activity of Some Cobalt Based Sodium Phosphates in Alkaline Solution

Published online by Cambridge University Press:  30 January 2018

Debasmita Dwibedi ,
Ritambhara Gond ,
Krishnakanth Sada ,
Baskar Senthilkumar  and
Prabeer Barpanda
Debasmita Dwibedi*
Affiliation:
Faraday Materials Lab, Materials Research Centre, Indian Institute of Science, Bangalore560012, India.
Ritambhara Gond
Affiliation:
Faraday Materials Lab, Materials Research Centre, Indian Institute of Science, Bangalore560012, India.
Krishnakanth Sada
Affiliation:
Faraday Materials Lab, Materials Research Centre, Indian Institute of Science, Bangalore560012, India.
Baskar Senthilkumar
Affiliation:
Faraday Materials Lab, Materials Research Centre, Indian Institute of Science, Bangalore560012, India.
Prabeer Barpanda
Affiliation:
Faraday Materials Lab, Materials Research Centre, Indian Institute of Science, Bangalore560012, India.
*
*Corresponding Author: Debasmita Dwibedi, debasmitad@iisc.ac.in
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Abstract

The development of efficient water oxidation catalyst is a major path to realize water splitting systems, which could benefit high performance and cost-effective metal-air batteries, fuel cells and solar energy conversion. To date, the rare crustal abundant platinum group metals rule this sector with Pt-alloys being the best for oxygen reduction reaction (ORR) and ruthenium oxides for oxygen evolution reaction (OER) in acidic solution. However, they show poor stability and are too expensive for large scale applications. Moreover, oxygen reduction in basic solutions can otherwise be catalysed by metal oxide with non-precious earth abundant transition metals (e.g. Fe, Co, Ni). Hence, there is a massive demand to explore noble metal free bifunctional electrocatalysts. In this work, we present the electrocatalytic activity of three cobalt based sodium phosphates namely NaCoPO4 (with one phosphate), Na2CoP2O7 (with two phosphate) NaFe2Co(PO4)3 (with three phosphate). Synthesized by solution combustion route, all these phosphates confirmed phase purity. NaCoPO4 and Na2CoP2O7 adopted orthorhombic structure with Pnma and Pna21 space group respectively; whereas NaFe2Co(PO4)3 crystallized in monoclinic (C2/c) framework. Electrocatalytic activity of these cobalt phosphates were inspected by linear sweep voltammetry with rotating disk electrode (RDE). All three showed promising bifunctional activity. In fact, the ORR activities of both orthorhombic cobalt phosphates are comparable to Vulcan carbon and Pt/C. OER activity of Na2CoP2O7 overrode other phosphates. The bifunctional activity and good stability of these sodium cobalt phosphates stem from cobalt ions and stabilization of the catalytic centres by the phosphate frameworks. The present work builds a detail structure-property correlation in these phosphate systems and also demonstrates the possibility of utilizing these sodium cobalt phosphates as alternate cost-effective, novel electrocatalysts for efficient OER/ORR activity in alkaline solution.

Keywords

catalyticoxidationcombustion synthesis
Type
Articles
Information
MRS Advances , Volume 3 , Issue 22: Energy and Sustainability , 2018 , pp. 1215 - 1220
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Copyright
Copyright © Materials Research Society 2018 

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References

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