离解(化学)
光催化
化学
催化作用
解吸
硼
氧气
光化学
活性氧
无机化学
吸附
有机化学
生物化学
作者
Jun Luo,Changzheng Fan,Lin Tang,You‐Nian Liu,Zhixuan Gong,Tangshan Wu,Xinlan Zhen,Chengyang Feng,Haopeng Feng,Lingling Wang,Liang Xu,Ming Yan
标识
DOI:10.1016/j.apcatb.2021.120757
摘要
The generation of H+ by active species attacking proton donor (PD) is a key step in photocatalytic H2O2 production (PHP). Deeply analyzing the involved mechanism may be a crucial factor to break through the bottleneck of H2O2 yield. Here, nitrogen-deficient and boron-doped g-C3N4 are synthesized for PHP and the interaction mechanisms between active species and PD are revealed. The prepared photocatalyst exhibits a high H2O2 production rate (455 μM h−1 g−1). The 1O2, •O2- and hole promoted by modification site dominate twelve different reaction mechanisms, respectively. For the oxidation pathways dominated by hole, H2O2 generation is limited by the dissociation of PD or desorption of H+ on catalyst surface. Interestingly, •O2- and 1O2 could directly attack PD, or diffuse into solution to react with PD to produce H2O2 with lower barriers. Moreover, there is a synergistic effect between doped-boron, 1O2 and water bridge, which further reduces the reaction barrier.
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