It is well established that under neutral water splitting, an enhancement in acidic and basic conditions takes place around anode and cathode, respectively, upon cell operation. This is usually considered detrimental for electrochemical water splitting , however herein, we have explored this phenomenon as a benefit to perform direct spatiotemporal dynamic in-situ optical visualization of on-catalyst water splitting processes. For this purpose, we have Upon increasing or decreasing the pH, an increase or decrease in the band intensity is observed at ⁓450 nm and ⁓400 nm, respectively. Specifically, upon increasing the pH from 7, an increase in the band intensity at ⁓450 nm is observed with a concomitant decrease in that at ⁓400 nm.