I tried to prepare a PVA/H2SO4 gel electrolyte, but when adding H2SO4 in PVA soln it forms white precipitates. Can anyone suggest how to avoid that?

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Yuri Mirgorod

Subhasree Panda

The precipitate is formed as a result of salting out of PVA or the formation of an oxonium salt between PVA and sulfuric acid. Try

1.heat the mixture

2. reduce the concentration of sulfuric acid or PVA

3. add salting agents urea, thiourea, guadinium chloride

Arnab Mukherjee

Thank you Yuri Mirgorod

Best wishes Subhasree Panda

Thank you @Yuri Mirgorod

Heating the mixture bit more than room temperature resulted in clear hydrogel