SciTechDaily links a heat-to-electricity medium: WSi2.
As thermodynamics go, once you use the electricity obviously it goes to heat again. And some will get lost en-route and have to be air-conditioned out. You can't win, you can't break even.
... but I daresay, if on an asteroid mine, the radiators form splendid bottlenecks to catch most the heat for reuse. Also mayyybe the WSi2 could power diodes for a visual diagnostic on those refractory panels (also largely tungsten). We are told that this material has a high melt point itself.
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