I am trying to build an aqueous and solid-state zinc-air battery that will utilize a 3-6M KOH solution as an electrolyte. I would like to order a current collector for the air-cathode side and I have been torn between Ti, Ni, or stainless steel mesh.
Both the Ti and Ni mesh are relatively expensive (£100+ for 15cm by 15cm meshes), with Ni possibly contributing to OER activity during charging however likely corrode to form NiO and Ti being generally known for its chemical stability. Furthermore what kind of wire thickness of the mesh would be most suitable? Am I correct in thinking that smaller wire mesh will provide greater contact area and oxygen permittivity, so I should aim for the smallest available?
Would someone kindly provide me with a little bit of advice on the matter? Many thanks
We are using this type of Nickel Foam...
https://www.alibaba.com/product-detail/Ni-Foam-Nickel-Foam-for-Battery_62041848444.html
Hi Szymon,
From what I have seen for alkaline media:
Nickel is chemically resistant, and a good OER catalyst. Can dislodge catalyst during charging.
Titanium doesn't evolve oxygen during charging, but you may get some dissolution initially.
Steel may release ions such as Fe, Cr, Mn over time that can contaminate the zinc electrode.
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