We report a confined proton transportation in the CeO 2 /CeO 2−δ core–shell structure to build up proton shuttles, leading to a super proton conductivity of 0.16 S cm –1 for the electrolyte and advanced fuel cell performance, 697 mW cm –2 at 520 °C. The semiconductor nature of the CeO 2 (i-type) cor...
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