“…As shown in Figure a,b, conductivity depends closely on the specific RH at 35 °C. The value increased from 4.8 × 10 –4 (55% RH) to 1.2 × 10 –3 S cm –1 (70% RH), which is superior to the conductivity of most reported proton-conductive POMs under similar conditions. − With increasing temperature, the conductivity increased rapidly and achieved 1.2 × 10 –2 S cm –1 as the maximum at 85 °C (Figure c,d), which is among the highest proton conductivities yet found in POM-based materials under similar operating conditions (Table S4), holding great prospects as solid electrolytes in proton-exchange membrane (PEM) fuel cells. ,,,− The research data has shown that the proton-conductive performance of DMA-KNaLi-As 10 is heavily affected by a combined impact of temperature and RH. Clearly, the proton transport in DMA-KNaLi-As 10 might be markedly enhanced under hot and humid environments.…”