Well-Dispersed Ruthenium in Mesoporous Crystal TiO 2 as an Advanced Electrocatalyst for Hydrogen Evolution Reaction
2018; American Chemical Society; Volume: 140; Issue: 17 Linguagem: Inglês
10.1021/jacs.7b13736
ISSN1943-2984
AutoresShuying Nong, Wujie Dong, Junwen Yin, Bo‐Wei Dong, Yue Lu, Xiaotao Yuan, Xin Wang, Kejun Bu, Mingyang Chen, Shang‐Da Jiang, Limin Liu, Manling Sui, Fuqiang Huang,
Tópico(s)Advanced battery technologies research
ResumoTiO2 mesoporous crystal has been prepared by one-step corroding process via an oriented attachment (OA) mechanism with SrTiO3 as precursor. High resolution transmission electron microscopy (HRTEM) and nitrogen adsorption–desorption isotherms confirm its mesoporous crystal structure. Well-dispersed ruthenium (Ru) in the mesoporous nanocrystal TiO2 can be attained by the same process using Ru-doped precursor SrTi1–xRuxO3. Ru is doped into lattice of TiO2, which is identified by HRTEM and super energy dispersive spectrometer (super-EDS) elemental mapping. X-ray photoelectron spectroscopy (XPS) and electron paramagnetic resonance spectroscopy (EPR) suggest the pentavalent Ru but not tetravalent, while partial Ti in TiO2 accept an electron from Ru and become Ti3+, which is observed for the first time. This Ru-doped TiO2 performs high activity for electrocatalytic hydrogen evolution reaction (HER) in alkaline solution. First-principles calculations simulate the HER process and prove TiO2:Ru with Ru5+ and Ti3+ holds high HER activity with appropriate hydrogen-adsorption Gibbs free energies (ΔGH).
Referência(s)