Abstract

We investigate the influence of MnO2 polymorphism form on MnO2/Ag2O hydrogen getter. The results show that the performances strongly depend on the polymorphism form of manganese oxide. The nsutite γ-MnO2 phase, which consists of a random intergrowth of MnO2–ramsdellite and MnO2–pyrolusite building blocks, shows the more promising performances to trap H2 via the formation of hydroxyl groups. This observation is especially relevant for compounds with a low pyrolusite/ramsdellite ratio and a high rate of microtwinnings.

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