Controlling of Localized PHS and Ion Adsorption Is the Key for High Performance NiMoP Catalyst Deposition for Water Splitting

Molybdenum based catalysts are found to be better water splitting catalyst. But its electrodeposition from aqueous solution of its salts is difficult because of its strong affinity with oxygen. Here we have optimized a synthesis strategy for efficient deposition of its alloy with Ni and P on stainless steel (SS). The Mo precursor used was Na 2 MoO 4 . Acid treatment of SS and effect of LiCl additive in the electrodeposition bath was studied. Galvanostatic studies and in-situ Raman spectroscopy were used to verify MoO 4 2- adsorption on stainless steel and localized pH influence of deposition quality. By optimizing the deposition bath and deposition condition, we were able to successfully synthesize efficient NiMoP alloy on ATSS (NiMoP-ATSS). The optimized catalyst showed an outstanding hydrogen evolution reaction (HER) performance with overpotential of around -62 mV for 10 mA/cm 2 . It was also found that the HER activated catalyst was also a very good OER catalyst with a reduced overpotential of only 260 mv for 10 mA/cm 2 .