Phosphorus-oxygen co-doped graphite carbon nitride (POx-CN) are successfully fabricated by in situ impregnation and two-stage thermal polycondensation to investigate the effect of Na and Cl on the photocatalytic hydrogen evolution from artificial seawater splitting. The as-prepared POx-CN exhibits a hydrogen evolution rate of 1054.29 μmolgh in artificial seawater, lower than fresh water, indicating that Na and Cl play an inhibitory effect on hydrogen evolution reaction. The theoretical calculation indicates that the phosphorus-oxygen binary doping changed the electrostatic potential of the modified layer in carbon nitride molecule, accelerating the electron transfer rate from the structural O in triazine ring to P-N bond. In artificial seawater, the competition between Na and Pt at active sites in the modified layer and electron capture by Cl in the mutual conversion of Cl and chlorine radicals result in the reduction of hydrogen evolution efficiency.

中文翻译：

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Na+和Cl-对磷酸盐-氧共掺杂石墨氮化碳光催化分解水制氢性能的干扰机制：实验与理论计算


通过原位浸渍和两阶段热缩聚成功制备了磷氧共掺杂石墨氮化碳（POx-CN），以研究Na和Cl对人工海水分解光催化析氢的影响。所制备的POx-CN在人工海水中的析氢速率为1054.29 μmolgh，低于淡水，表明Na和Cl对析氢反应具有抑制作用。理论计算表明，磷氧二元掺杂改变了氮化碳分子中修饰层的静电势，加速了电子从三嗪环结构O向P-N键的转移速率。在人工海水中，改性层活性位点Na和Pt之间的竞争以及Cl和氯自由基相互转化中Cl的电子捕获导致析氢效率降低。