| Abstract |
| This study investigated the electrochemical characteristics of an NSS (Ni-Sb-SnO2) anode and a CNT (Carbon Nanotube) cathode, quantifying the generation of reactive oxygen species (·OH, O3, H2O2) in single (half -reaction, NSS or CNT) and combined (full-reaction, NSS-CNT) system under varying applied potentials. Surface morphology analysis showed that the NSS electrode possesses a highly porous microstructure with pore sizes of approximately 20-30 nm, whereas the CNT electrode exhibits a thread-like porous network structure with diameters ranging from 50 to 80 nm. The NSS electrode exhibited a consistent onset potential of 1.47 V (vs. Ag/AgCl) regardless of the purging gas. In contrast, the CNT electrode showed significant differences in Linear sweep voltammetry (LSV) depending on the gas conditions (-0.36 V under O₂ and -1.02 V under N₂ vs. Ag/AgCl). Under O₂ purging conditions, O3 production increased with applied voltage, yielding 0 ~ 0.65 μmol in the combined NSS-CNT system and 0 ~ 0.94 μmol in the single NSS system. High H2O2 production (18.97 ~ 29.95 μmol) was observed at relatively low potential ranges (Ecell = 2.0, 2.8 V; Ec = -0.5, -1.0 V vs. Ag/AgCl), with the maximum yield occurring at Ecell = 2.0 V and Ec = -1.0 V. After 60 minutes, ·OH production ranged from 8.59 to 18.75 μmol for the single NSS system and 6.52 to 18.22 μmol for the combined NSS-CNT system. Notably, the combined system exhibited a sharp increase at Ecell = 2.8 V, likely due to additional reactions - such as the Peroxone process or further electrochemical reduction - involving the H2O2 generated at the CNT cathode. |
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| Key Words |
| Carbon Nonotube, Combined Process, Ni-Sb-SnO2, Reactive Oxygen Species, Single Process, 탄소나노튜브, 결합공정, 활성산소종, 단일공정 |
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