Manipulating the crystalline morphology and facet orientation of copper and copper-palladium nanocatalysts supported on stainless steel mesh with the aid of cationic surfactant to improve the electrochemical reduction of nitrate and N2 selectivity

作者：Shih, Yu-Jen; Wu, Zhi-Lun; Lin, Chun-Yen; Huang, Yao-Hui; Huang, Chin-Pao

来源：Applied Catalysis B: Environmental , 2020, 273: 119053.

DOI：10.1016/j.apcatb.2020.119053

• Nitrate reduction
• Electrochemical
• Crystalline morphology
• N(2)selectivity
• Copper-palladium nanocatalysts

Surfactants, namely, cetyltrimethylammonium chloride, polydiallyldimethylammonium chloride, and benzethonium chloride were used to control the crystal growth of metallic Cu nanoparticles supported on stainless steel mesh electrodes as to improve the selective electrochemical conversion of NO3- to non-toxic N-2. Results showed that the Cu(200)/Cu(111) ratio controlled the selectivity of N-2, NO2-, and NH4+. The K-d value increased from 10% to 30% when the Cu(200)/Cu(111) intensity ratio was decreased 60% to 30%, meaning increase Cu(111) increased N-2 production. Furthermore, the presence of a second metal, namely, Pd increased the N-2 selectivity. The best N-2 yield (X-N2 = 22%), occurring on monometallic Cu, synthesized with BZT at 1-time CMC was further increased to X-N2 = 65% over bimetallic Pd0.27Cu0.73/SS. The selectivity of nitrite (SNO2-) and ammonium (SNH4+) on Cu/SS were 33.1 and 43.5%, respectively, which were decreased to 0.30 and 34.0%, respectively, on bimetallic Pd0.27Cu0.73/SS.

• 单位
  中山大学