Electroreduction of Nitrous Oxide to Nitrogen at Gas Diffusion Electrodes with Various Metal Catalysts

The electrochemical reduction of N20was investigated at gas di伽sio皿eled■odes with various metal (Ru，Rh，圧1，Pd，Pt，Cu，Ag and Au)catalysts． Current e伍ciencfes of N2fbrmation at Pd，Rh and Pt catalysts are100％in the range O to O，4V， Hydrogen evolution also takes pla㏄at lower than O V． Nitrate ions，nitrite ions，hydroxylamine，hydmzine and ammo皿ia were not detected in electrolyte a丘er elecImlysis． It was elucidated that activity fbr N20reductio皿to N2童n l mol L 1KOH increases i皿Ihe order of the catalysts Pd＞R上二Pt＞Ir＞Cu＞Ru＞Ag＞＞Au・ The genemtion ofelectricity and N20decompositio皿can be a㏄omplishcd byusing a H2-N20釦el㏄11 reactor at thc same time． The current densit董es at Pd，Rh a皿d Pt catalysts ale approximately45，32and