Unlocking Grotthuss Proton Energy Storage in Pyrochlore‐Type Tungsten Oxide

at 100C, ultrafast charging capability up to 500C, and ultralong cycling life over 30,000 cycles. Once coupled with Prussian blue analogue cathodes with identical Grotthuss conduction mechanism, the resultant high-output-voltage full-cells (≈1.1 V) sustain high-rate cycling with high energy/power density and operate at a wide working temperature from -20 to 50 °C.