首页|Promoting electroreduction of nitrite to ammonia over electron-deficient Pd modulated by rectifying Schottky contacts
Promoting electroreduction of nitrite to ammonia over electron-deficient Pd modulated by rectifying Schottky contacts
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Electrochemical nitrite reduction reaction(NO2RR)is a potential sustainable route for regulating the nitrogen cycle and ambient ammonia(NH3)synthesis.However,it remains a challenge to precisely reg-ulate the reaction pathways and inhibit competing reactions(e.g.hydrogenolysis)for efficient and selec-tive NH3 production in an aqueous solution environment.Here,we utilize the Schottky barrier-induced surface electric field to construct high-density electron-deficient Pd nanoparticles by modulating the N content in the carbon carrier to promote the enrichment and immobilization of NO2 on the electrode sur-face,which ensures the ultimate selectivity for NH3.With these properties,Pd@N0.14C with the highest N content achieved excellent catalytic performance for the reduction of NO2 to NH3 with the 100％Faraday efficiency at-0.5 and-0.6 V vs.reversible hydrogen electrode(RHE)for NH3 production,which was sig-nificantly better than Pd/C and Pd@NxC samples with lower N content.This study opens new avenues for rational construction of efficient electrocatalysts for nitrite removal and NH3 electrosynthesis.
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