Electrocatalytic reduction combined electrode and preparation method and application thereof

The invention discloses an electrocatalytic reduction combined electrode and a preparation method and application thereof. The electrode is characterized in that a graphite felt is taken as a substrate, and a multiwalled carbon nanotube, a nickel metal layer and a palladium metal layer are deposited on the substrate sequentially. The method includes: firstly, preparing the multiwall carbon nanotube/graphite felt electrode; soaking the electrode in a nickel salt solution and forming the nickel metal layer on the surface of the electrode through high-temperature nitrogen reduction; forming the palladium metal layer through direct metal reduction in a palladium salt solution to obtain the nickel-palladium bimetal combined electrode. The combined electrode is high in catalytic activity and good in stability, and nitrobenzenes and chlorphenols in water can be subjected to electrocatalytic treatment rapidly and efficiently.