Electrochemical reduction of nitrate synthesis ammonia(NO3-RR)not only contributes to the removal of nitrate nitrogen pollutants in water,but also helps to alleviate the social demand for ammonia energy,reduce pollution and energy consumption.Catalysts determine the performance of NO3-RR to some extent.However,most reported NO3-RR catalysts have low ammonia yield and poor stability,so the preparation of high performance and stable NO3-RR catalysts becomes important in this field.CuS/Mo6S8 heterogeneous electrocatalysts were prepared.The physicochemical properties and NO3-RR properties of CuS/Mo6S8 heterogeneous electrocatalysts were system-atically studied,and the related structure-activity relationships were discussed.The experimental results show that the Faraday efficiency and NO3-conversion rate of CuS/Mo6S8 were 92.12％and 91.34％,respectively,better than CuS(81.11％and 74.13％)and Mo6S8(84.27％and 80.23％),and that after four consecutive cycles(12 hours in total)of NO3-RR test,CuS/Mo6S8 showed excellent stability with no obvious attenuation of various properties.The heterogeneous catalyst had a strong interfacial effect,which changed the electronic structure of CuS/Mo6S8 through electron transfer between Cu and Mo,and thus improved NO3-RR performance.This study provides a high performance and stable NO3-RR catalyst,which can also be used for reference in the design of other highly efficient heterogeneous catalysts.
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