21-Achieving an unprecedented hydrogen evolution rate by solvent-exfoliated CPP-based photocatalysts
作者：Jing-Zhao Cheng, Li-Lin Liu, Guangfu Liao, Zhao-Qi Shen, Zhi-Rong Tan, Yu-Qin Xing, Xiao-Xiao Li,
關(guān)鍵字：photocatalytic
論文來源：期刊
具體來源：https://doi.org/10.1039/C9TA13514F
發(fā)表時(shí)間：2020年
How to prompt higher photocatalytic hydrogen production (PHP) efficiency from water to achieve practical applications still remains a big challenge with conjugated porous polymers (CPP)-based photocatalysts. Herein, we developed a simple and efficient cosolvent-assisted strategy to significantly improve the photocatalytic efficiency of CPP-based photocatalysts by introducing water-soluble aprotic bipolar co-solvents, including N,N-dimethylformamide (DMF), N,N-dimethylacetamide (DMAc), and N-methyl pyrrolidone (NMP). The PHP activity of the pyrene–bithiophene-based CPP (named CP-St) using ascorbic acid (AA) as a sacrificial electron donor could be excellently accelerated in the presence of an aprotic bipolar NMP solvent. CP-St dispersed in an NMP/H2O/AA mixed solution under visible-light (λ > 420 nm) irradiation without the aid of a Pt cocatalyst achieved an unprecedented hydrogen evolution rate (HER) of 190.7 mmol h?1 g?1. As a result, 6 mg CP-St amazingly produced 128.1 mL H2 (～5.72 mmol) under visible-light irradiation for only 5 h. Excitingly, by introducing 0.5 wt% Pt cocatalyst into the NMP/H2O/AA system, the HER of CP-St could be further boosted to 303.7 mmol h?1 g?1 (1.82 mmol h?1/6 mg), which represents the highest photocatalytic HER ever reported. This outstanding photocatalytic performance is mainly ascribed to the enhanced dispersity, strong hydrogen-bond interactions, and exfoliation effect by the NMP solvent. This study provides us with some new design ideas and opportunities for effectively catering to the actual hydrogen production demand.