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Electrochemical investigations of polycrystalline HxNb2O5

Abstract Polycrystalline samples of H x Nb 2 O 5 were prepared by electrochemical reduction of pressed and sintered powder samples of the H-Nb 2 O 5 modification. The hydrogen content of the bronze was determined by redox titration. The electrode potential showed that the bronze is thermodynamically unstable with respect to decomposition into Nb 2 O 5 and gaseous hydrogen. The hydrogen loss obeys a second-order rate law. The electrode potential fulfills Nernst's law with a square dependence on the hydrogen content. The specific resistance of H 0.18 Nb 2 O 5 determined by four-point dc measurements amounts to ρ(30°C) = (0.0110 ± 0.0015) Ω cm. The protonic conductivity of the bronze was substantiated by polarization experiments and the diffusion coefficient of H ( D ≈ 5 × 10 -9 cm 2 /sec) was estimated from the rate law of the depolarization voltage.