Tunable Surface Electric Field of Electrocatalysts via Constructing Schottky Heterojunctions for Selective Conversion of Trash Ions to Treasures

Surface electric field of catalyst is widely recognized as one of the key points to boost catalytic activity. However, there is still a lack of convenient ways to tune the surface electric field to selectively boost the catalytic conversions of different types of reactants in specific catalytic reactions. Here, we introduce a conceptually new method to tune the surface electric field of electrode materials by adjusting the number and density of heterojunctions inside. Both theoretical and experimental results prove that the well‐designed surface electric field of an electrocatalyst plays a key role in facilitating pre‐adsorption and/or activation of reactants for selective conversion of trash ions to useful products in hydrogen and oxygen evolution reactions as well as NOx− reduction reactions. A conceptually new method is proposed to tune the surface electric field of electrocatalysts by adjusting the number and density of heterojunctions inside. The well‐designed surface electric field of an electrocatalyst plays a key role in facilitating pre‐adsorption and/or activation of reactants for selective conversion of trash ions to useful products.