羰基合成与选择氧化国家重点实验室（OSSO）知识库

Due to the unique character of methyl viologen (MV²⁺), namely, the electron oscillation that may occur in the process of MV²⁺ reduction and oxidation, by means of MV²⁺ addition, reacting system inert-atmosphere and electron donor addition, based on the peculiar contribution of MV²⁺ with an electron oscillation characters, the stabilities and hydrogen evolution of the Co₃O₄-g-C₃N₄ photocatalyst were greatly improved. Charge separation and electron transfer were more efficient under the condition of MV²⁺ addition, as supported by fluorescence studies. The photoreduction of MV²⁺ by Eosin Y (EY²⁻) can form a persistent methyl viologen radical cation (MV^•+). MV²⁺, as an excellent electron relay, greatly facilitated electron transfer from the excited state ³(EY²⁻)* to the conduction band of Co₃O₄-g-C₃N₄. Accordingly, the excited state ³(EY²⁻)* was oxidized by MV²⁺; this process effectively promoted the circulation regeneration of EY²⁻, suppressed the generation of unstable intermediate EY^•3−, and reduced the decomposition of EY.