Aqueous solution reaction to synthesize ammonium hexachloroplatinate and its crystallographic and thermogravimetric characterization

摘要

Ammonium hexachloroplatinate (Pt(NH_4)_2Cl_6) has been proven to be a good precursor to obtain metallic Pt by thermal decomposition, in addition to being a stable compound easily obtained from a variety of Pt recuperation processes. This work was aimed to develop a simple way to synthesize Pt(NH_4)_2Cl_6. The crystallographic characterization by powder and single crystal XRD is reported, along with a simulation of the XRD patterns performed with the software Cerius~2. A thermogravimetric analysis (TGA) allowed insight into the thermal decomposition process, which has been confirmed to take place in two steps, between 175 and 400 deg C. This low decomposition temperature makes Pt(NH_4)_2Cl_6, an ideal catalyst precursor to obtain Pt/C for polymer electrolyte membrane fuel cell (PEMFC) electrode fabrication.