Cobalt (hydr)oxide/graphite oxide composites: Importance of surface chemical heterogeneity for reactive adsorption of hydrogen sulfide

► Composites of cobalt hydr(oxide) and graphite oxide show a significant H2S adsorption capacities. ► OH groups of composites and new interface surface chemistry enhance the amount adsorbed. ► Oxygen activation by the carbonaceous component and acid-base reactions contributes to the enhanced adsorption.