Ceria nanocrystals supporting Pd for formic acid electrocatalytic oxidation: prominent polar surface metal support interactions by Ye, L, Mahadi, A, Saengruengrit, C, Qu, J, Xu, F, Fairclough, S, Young, N, Ho, P, Shan, J, Nguyen, L, Tao, F, Tedsree, K, Tsang, S