Rapid hydrogen mobility over a Ru nanoparticle-doped polar MgO(111) surface Tatchamapan Yoskamtorn 1 , Jiaying Mo 1 , Lu Chen 2 , Simson Wu 1 , Sanghamitra Mukhopadhyay 3 , Alex Hawkins 3 , Xin-Ping Wu 2* , Shik Chi Edman Tsang 1* 1 University of Oxford, UK, 2 East China University of Science and Technology, China, 3 Rutherford Appleton Laboratory, UK Hydrogen (H) conductivity on oxide-based materials is crucially important in fuel cells and related catalysis. Here, this work measures the diffusion rate of H generated from Ru nanoparticles loaded on polar MgO(111) facet particles under H 2 at elevated temperatures without moisture and compares it to conventional nonpolar MgO(110) for the first time by in situ quasielastic neutron scattering (QENS). The QENS reveals an exceptional diffusion rate on the polar facet via a proton (H + ) hopping mechanism, which is an order of magnitude superior to that of typical H + -conducting oxides. This work attributes this to the unique atomic arrangement of alternate layers of Mg cations and O anions of the polar MgO(111) where the strong electrostatic field of terminal oxygen anions facilitates protonic migration with a lower degree of local covalency.
References 1. Yoskamtorn, T.,Mo, J.,Chen, L.,Wu, S.,Mukhopadhyay, S.,Hawkins, A.,Wu, X.-P.,Tsang, S. C. E., Small Methods 2023 , 2201200. 2. S. Wu,Y.-K. Peng,T.-Y. Chen,J. Mo,A. Large,I. McPherson,H.-L. Chou,I. Wilkinson,F. Venturini,D. Grinter,P. Ferrer Escorihuela,G. Held,S. C. E. Tsang, ACS Catal . 2020 , 10 ,5614. 3. S. Wu,K.-Y. Tseng,R. Kato,T.-S. Wu,A. Large,Y.-K. Peng,W. Xiang,H. Fang,J. Mo,I. Wilkinson,Y.-L. Soo,G. Held,K. Suenaga,T. Li,H.-Y. T. Chen,S. C. E. Tsang, J. Am. Chem. Soc. 2021 , 143 ,9105.
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