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A unique approach for the synthesis of nonstoichiometric, mesoporous molybdenum oxide (MoO3–x) with nanosized crystalline walls by using a soft template (PEO‐b‐PS) synthesis method is introduced. The as‐synthesized mesoporous MoO3–x is very active and stable (durability > 12 h) for the electrochemical hydrogen evolution reaction (HER) under both acidic and alkaline conditions. The intrinsic MoO3 serves as an HER electrocatalyst without the assistance of carbon materials, noble metals, or MoS2 materials. The results from transmission electron microscopy and N2 sorption techniques show that the as‐synthesized mesoporous MoO3–x has large accessible pores (20–40 nm), which are able to facilitate mass transport and charge transfer during HER. In terms of X‐ray diffraction, X‐ray photoelectron spectroscopy, temperature‐programmed oxidation, and diffusive reflectance UV–vis spectroscopy, the mesoporous MoO3–x exhibits mixed oxidation states (Mo5+, Mo6+) and an oxygen‐deficient structure. The as‐synthesized MoO3–x only requires a low overpotential (≈0.14 V) to achieve a 10 mA cm−2 current density in 0.1 m KOH and the Tafel slope is as low as 56 mV dec−1. Density functional theory calculations demonstrate a change of electronic structure and the possible reaction pathway of HER. Oxygen vacancies and mesoporosity serve as key factors for excellent performance.
Advanced Energy Materials – Wiley
Published: Aug 1, 2016
Keywords: ; ; ; ;
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