Electrocatalytic regeneration of atmospherically aged MoS2 nanostructures via solution-phase sulfidation

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The performance of MoS2 as a hydrogen evolution catalyst is diminished by exposure to air. We demonstrate a solution phase technique to resulfidate MoSxO2−x using Na2S2O3. The success of the method was judged by performance as a H+ reduction catalyst. Following sulfidation samples displayed a favourable decrease in both onset potential and Tafel slope, with the best decreasing from −0.23 V to −0.18 V (vs. SHE), and 282 mV dec-1 to 87 mV dec-1 respectively. Ageing studies indicate that this method may be used to recycle the MoS2 repeatedly without losing catalytic performance, although repeated sulfidation did result in homogenisation of the nanostructure.


Original languageEnglish
Pages (from-to)26689-26695
JournalRSC Advances
Issue number32
Early online date4 Mar 2016
Publication statusPublished - 2016