Metal exsolution from perovskite oxides offers a promising approach to developing highly active catalysts. Voltage-driven exsolution achieves a faster rate and better dispersion of the nanoparticles. However, the impact of the external voltage on the dynamic of metal exsolution remains unclear. In this work, we utilized spatially resolved in situ X-ray photoelectron spectroscopy and photoemission electron microscopy to systematically investigate the effect of varied potentials on exsolution within one sample, where spatially graded potentials were applied on a La