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Development of excellent and cheap electrocatalysts for water electrolysis is of great significance for application of hydrogen energy. Here, we show a highly efficient and stable oxygen evolution reaction (OER) catalyst with multilayer-stacked hybrid structure, in which vertical graphene nanosheets (VGSs), MoS 2  nanosheets, and layered FeCoNi hydroxides (FeCoNi(OH) x ) are successively grown on carbon fibers (CF/VGSs/MoS 2 /FeCoNi(OH) x ). The catalyst exhibits excellent OER performance with a low overpotential of 225 and 241 mV to attain 500 and 1000 mA cm −2  and small Tafel slope of 29.2 mV dec −1 . Theoretical calculation indicates that compositing of FeCoNi(OH) x  with MoS 2  could generate favorable electronic structure and decrease the OER overpotential, promoting the electrocatalytic activity. An alkaline water electrolyzer is established using CF/VGSs/MoS 2 /FeCoNi(OH) x  anode for overall water splitting, which generates a current density of 100 mA cm −2  at 1.59 V with excellent stability over 100 h. Our highly efficient catalysts have great prospect for water electrolysis.

nature communications

Graphene/MoS2/FeCoNi(OH)x and Graphene/MoS2/FeCoNiPx multilayer-stacked vertical nanosheets on carbon fibers for highly efficient overall water splitting