Journal Article CO2 reduction reaction 2e− oxygen reduction Anti-Bacterial Agents Concentrated leachate Cu dual atom site Emerging contaminants Hazardous waste identification Heavy metals Metals, Heavy Mott-Schottky interactions PN junction Pd/C3N4 catalyst Water Pollutants, Chemical X‐ray absorption spectroscopy asymmetric coordination asymmetrical coordination built‐in electric field dual‐atom catalyst ethanol selectivity heterojunction nest‐like structure nitrogen defects photocatalysis selective transfer hydrogenation single atom catalysts sulfur bridge