Synthesis of Pt/C electrocatalyst from a user-friendly Pt precursor - ammonium hexachloroplatinate through microwave-assisted polyol synthesis

Raghunandan Sharma, Yue Wang, Fan Li, Jessica Chamier, Shuang Ma Andersen*

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Abstrakt

Ammonium hexachloroplatinate (NH4)2PtCl6, owing to its low solubility in NH4Cl containing aqueous solutions, is an intermediate compound during the hydrometallurgical extraction of platinum. As a rare example of a water soluble and air stable platinum(IV) salt that is not hygroscopic, (NH4)2PtCl6, may be a convenient and economic platinum precursor for large-scale catalyst production. This report investigates the feasibility of (NH4)2PtCl6 as Pt precursor for synthesis of the electrocatalysts for polymer electrolyte membrane fuel cells (PEMFCs), i.e., the Pt supported on high surface area carbon (Pt/C). The Pt/C electrocatalysts with ~20 wt.% Pt loading are synthesized through a microwave assisted polyol synthesis approach. The reaction parameters, namely the reaction time and the reaction temperature are optimized. In terms of the electrochemical surface area, Pt/C electrocatalyst synthesized at a reaction temperature of 140 oC and a reaction time of 150 s using a Pt concentration of 5 mM exhibited the optimal performance. The process may be used to synthesize Pt/C electrocatalysts having electrochemical performance equivalent to the Pt/C catalyst available commercially or that synthesized using the common precursors such as H2PtCl6.
OriginalsprogEngelsk
TidsskriftACS Applied Energy Materials
Vol/bind2
Udgave nummer9
Sider (fra-til)6875-6882
ISSN2574-0962
DOI
StatusUdgivet - 23. sep. 2019

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