When bismuth is deposited chemically on lead, hydrogen evolution reaction mainly occurs on bismuth, which has a lower hydrogen evolution overpotential than lead.

• 当铅电极表面化学沉积铋时，析氢反应主要发生在金属铋上，由于金属铋上的析氢反应过电位比铅上低，表现出很大的析氢电流。