Year: 2026
Type: article
Abstract: CO2 and NO commonly coexist in flue gas, yet they are typically treated as independent targets in photocatalysis. Here we demonstrate that introducing NO can strongly promote photocatalytic CO2-to- CO conversion over TiO2 P25 in a batch gas-phase system. And larger NO inputs yield higher CO output per dosing event. Product analysis shows that NO is predominantly oxidized to NO2 and surface nitrate, as evidenced by flue-gas analysis and ion chromatography of catalyst eluates, whereas CO is essentially the only detectable CO2 reduction product. In situ DRIFTS further identifies the growth of nitrate/nitrite-like bands (1650–1250 cm⁻¹) during illumination under CO2 + NO. Importantly, the NO-triggered CO formation persists under anhydrous conditions, indicating that CO2-to-CO conversion can proceed without an external proton source and is inconsistent with a purely PCET-driven pathway. These results suggest an OCET-like coupling scenario in which NO oxidation provides an efficient oxidative channel, suppresses charge recombination, and enhances electron utilization for selective CO production.
Authors: Ye He, Guangpu Li, Ruolin Liu, Fengyi Zhong
Language: English
Field: Energy
Domain: Physical Sciences
SDG: Climate action
Open Access status: green
OpenAlex ID: W7157092959
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