Corrigendum to “Pdni Alloy Nanoparticles Assembled on Cobalt Ferrite-Carbon Black Composite as a Fuel Cell Catalyst” [Int J Hydrogen Energy 44 (2019) 14193–14200] (International Journal of Hydrogen Energy (2019) 44(27) (14193–14200), (S0360319919300163), (10.1016/J.ijhydene.2018.12.221))