Abstract
Developing novel proton conductors is crucial to the electrochemical technology for energy conversion and storage. Metal-organic frameworks (MOFs) have been attracting wide attention in this regard. P-UC (UC = UiO-66-COOH) and G-UC were prepared with different methods. The structures of products were characterized by XRD and IR. Then, the proton conductivities of P-UC and G-UC at different temperatures were measured at 75% RH (RH = relative humidity) and 100% RH. The results show that the proton conductivity of G-UC is better than that of P-UC under the humidity conditions above. At 100% RH, the proton conductivity of G-UC reaches 8.53 × 10−2 S cm−1 at 353 K, which is 1.7 times that of P-UC. And at 303 K, the proton conductivity of G-UC is 4.55 × 10−2 S cm−1, which is three times that of P-UC. The Ea values of G-UC and P-UC at 100% RH were lower than that at 75% RH. Under the two kinds of relative-humidity conditions above, relative to P-UC, G-UC is a better proton conductive material, with more stable high proton conductivity and lower activation energy.
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