A tip including an alloy of platinum and an alloying element chosen from gold, palladium, ruthenium, osmium, iron, cobalt, nickel, copper, zinc, silver, chromium, manganese, titanium, niobium, scandium, vanadium, yttrium, zirconium, molybdenum, tantalum, tungsten, technetium, cadmium, hafnium, rhenium, less than 5 wt. % of iridium, less than 5 wt. % of rhodium, greater than 20 wt. % iridium, greater than 20 wt. % rhodium, and a combination thereof, relative to the total weight of the alloy is disclosed. An interface cone can include a base and the tip.