Graphene/MoS<sub>2</sub>/FeCoNi(OH)<sub>x</sub> and Graphene/MoS<sub>2</sub>/FeCoNiP<sub>x</sub> multilayer-stacked vertical nanosheets on carbon fibers for highly efficient overall water splitting.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 33654075.
- Also identified by DOI 10.1038/s41467-021-21742-y and PMC identifier 7925597.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
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<sub>2</sub> nanosheets, and layered FeCoNi hydroxides (FeCoNi(OH)<sub>x</sub>) are successively grown on carbon fibers (CF/VGSs/MoS<sub>2</sub>/FeCoNi(OH)<sub>x</sub>). The catalyst exhibits excellent OER performance with a low overpotential of 225 and 241 mV to attain 500 and 1000 mA cm<sup>-2</sup> and small Tafel slope of 29.2 mV dec<sup>-1</sup>. Theoretical calculation indicates that compositing of FeCoNi(OH)<sub>x</sub> with MoS<sub>2</sub> could generate favorable electronic structure and decrease the OER overpotential, promoting the electrocatalytic activity. An alkaline water electrolyzer is established using CF/VGSs/MoS<sub>2</sub>/FeCoNi(OH)<sub>x</sub> anode for overall water splitting, which generates a current density of 100 mA cm<sup>-2</sup> at 1.59 V with excellent stability over 100 h. Our highly efficient catalysts have great prospect for water electrolysis.