2D nanosheet molybdenum disulphide (MoS2) modified electrodes explored towards the hydrogen evolution reaction

摘要: We explore the use of two-dimensional (2D) MoS2 nanosheets as an electrocatalyst for Hydrogen Evolution Reaction (HER). Using four commonly employed commercially available carbon based electrode support materials, namely edge plane pyrolytic graphite (EPPG), glassy (GC), boron-doped diamond (BDD) and screen-printed electrodes (SPE), we critically evaluate reported electrocatalytic performance unmodified modified towards HER. Surprisingly, current literature focuses almost exclusively on GC underlying upon which HER materials are immobilised. 2D nanosheet found to exhibit a coverage dependant effect Modification supporting surface with optimal mass results in lowering onset potential by ca. 0.33, 0.57, 0.29 0.31 V at EPPG, GC, SPE BDD compared their counterparts respectively. The is associated each electrode's individual electron transfer kinetics/properties thus distinct. also explored. reveal that its ability catalyse dependent deposited until critical achieved, after benefits and/or stability curtail. active site density turn over frequency determined, characterised be both underlying/supporting substrate. This work essential those designing, fabricating consequently electrochemically testing