If you do not like Ag, there are only five safe variants: Au, Pt, Pd, Rh, Ru and two unsafe ones: Ir (oxidized from about 500°C) and Re (oxidized from about 400°C).

I'm sorry if it does not help you, but that's all.

Thermal spray coatings are often used to facilitate electrical conductivity. Electrical conductivity exists at some level in most materials. For the most part, electrically conductive coatings require low resistivity; accordingly, copper, aluminum, molybdenum and their alloys are among the most popular conductors.

For high temp applications, iron-chrome-aluminum, molybdenum-disilicide or gradated coatings are often the materials of choice. Electrically conductive thermal spray coatings can be applied to almost any substrate---from polymers and composites to ceramics. Considerations that must be taken into account are power levels and coating/substrate interactions under power and at temperature.

Thanks everyone for your answers.