There have been a slight few experiments with carbon nanotubes in LENR.
https://www.google.com/search?q=%22cold+fusion%22+lenr+carbon+nanotubes&sxsrf=ALeKk01R9RXvxC8JZAn65G57RzgIlpn1_A%3A1622646550617&source=hp&ei=Fp-3YNaEIsPetQXck5bQDQ&oq=%22cold+fusion%22+lenr+carbon+nanotubes&gs_lcp=ChFtb2JpbGUtZ3dzLXdpei1ocBADMgUIIRCrAjIFCCEQqwI6BwgjEOoCECc6DQguEMcBEK8BEOoCECc6DQguEMcBEK8BECcQkwI6BAgjECc6BAguECc6CAgAELEDEIMBOgsILhCxAxDHARCjAjoICC4QsQMQgwE6AggAOg4ILhCxAxCDARDHARCjAjoFCAAQsQM6AgguOgUIABDJAzoFCAAQkgM6BQguELEDOggILhDHARCvAToECAAQCjoGCAAQFhAeOggIABAWEAoQHjoFCAAQhgM6BQghEKABOgcIIRAKEKABUJwVWP2IAmCAnAJoBHAAeACAAfMBiAGXLpIBBjAuMzUuM5gBAKABAbABDw&sclient=mobile-gws-wiz-hp
I don’t think carbon is strong enough. They should try to make them of silicon.................