This study explores the use of contact-electro-catalysis (CEC) to reduce precious metal ions in aqueous solutions. CEC, which leverages contact electrification at water-solid interfaces, has been shown to efficiently degrade refractory organic compounds, produce hydrogen peroxide, and leach metals from spent Li-ion batteries. The research demonstrates that ultrasonic CEC can successfully reduce various precious metal ions, including Ag(ac), Rh3+, [PtCl4]2-, Ag+, Hg2+, Pt2+, [AuCl4]-, and Ir3+, in both aerobic and anaerobic conditions. The effect of oxygen on the reaction is studied using electron paramagnetic resonance (EPR) spectroscopy and ab-initio simulations. The study also shows that CEC can extract gold from synthetic solutions with concentrations ranging from 0.196 ppm to 196 ppm, achieving extraction capacities of 0.756 to 722.5 mg g-1 in 3 hours. Additionally, CEC is employed to design a metal-free, selective, and recyclable catalytic gold extraction method from e-waste aqueous leachates. The research highlights the potential of CEC for the efficient and environmentally friendly recovery of precious metals from various waste streams.This study explores the use of contact-electro-catalysis (CEC) to reduce precious metal ions in aqueous solutions. CEC, which leverages contact electrification at water-solid interfaces, has been shown to efficiently degrade refractory organic compounds, produce hydrogen peroxide, and leach metals from spent Li-ion batteries. The research demonstrates that ultrasonic CEC can successfully reduce various precious metal ions, including Ag(ac), Rh3+, [PtCl4]2-, Ag+, Hg2+, Pt2+, [AuCl4]-, and Ir3+, in both aerobic and anaerobic conditions. The effect of oxygen on the reaction is studied using electron paramagnetic resonance (EPR) spectroscopy and ab-initio simulations. The study also shows that CEC can extract gold from synthetic solutions with concentrations ranging from 0.196 ppm to 196 ppm, achieving extraction capacities of 0.756 to 722.5 mg g-1 in 3 hours. Additionally, CEC is employed to design a metal-free, selective, and recyclable catalytic gold extraction method from e-waste aqueous leachates. The research highlights the potential of CEC for the efficient and environmentally friendly recovery of precious metals from various waste streams.