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首页> 外文期刊>RSC Advances >Hydrogen peroxide-assisted synthesis of oxygen-doped carbon nitride nanorods for enhanced photocatalytic hydrogen evolution
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Hydrogen peroxide-assisted synthesis of oxygen-doped carbon nitride nanorods for enhanced photocatalytic hydrogen evolution

机译：过氧化氢辅助的氧掺杂氮化碳纳米棒的合成以增强光催化氢的释放

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Polymer-derived carbon nitrides based photocatalysts are very promising for solar water splitting, CO _(2) reduction and environmental remediation. However, these photocatalysts still suffer from low visible light utilization efficiency, rapid recombination of photogenerated charge carriers and slow transfer kinetics. Herein, we report a hydrogen peroxide-assisted hydrothermal strategy to synthesize one-dimensional oxygen-doped carbon nitrides (OCN) for photocatalytic hydrogen evolution. A possible self-assembly mechanism is discussed. Experimental results and theoretical calculations indicate that the as-synthesized one-dimensional OCN possess narrowed band gap energy and optimized band structure, which may allow more effective visible-light harvesting and facilitate photogenerated electron–hole pair separation and transfer. As a result, the photocatalytic hydrogen evolution rates improve from 10.4 μmol h ~(?1) to 74.0 μmol h ~(?1) under visible light ( λ > 400 nm), which is among the best of the reported CN-based photocatalysts for visible-light-driven hydrogen evolution. This study provides a new avenue toward the development of highly efficient carbon nitrides based photocatalysts for photocatalytic applications.
机译：聚合物衍生的基于碳氮化物的光催化剂对于太阳能水分解，CO_（2）还原和环境修复非常有前途。然而，这些光催化剂仍然遭受可见光利用效率低，光生电荷载流子的快速重组和慢的转移动力学的困扰。在这里，我们报告了一种过氧化氢辅助的水热策略，以合成一维的氧掺杂碳氮化物（OCN）来进行光催化氢的释放。讨论了一种可能的自组装机制。实验结果和理论计算表明，合成后的一维OCN具有较窄的带隙能和优化的带结构，可以实现更有效的可见光收集并促进光生电子-空穴对的分离和转移。结果，在可见光（λ> 400 nm）下，光催化氢的释放速率从10.4μmolh〜（？1）提高到74.0μmolh〜（？1），这是已报道的基于CN的最佳光催化剂之一用于可见光驱动的氢气释放。这项研究为开发用于光催化应用的高效氮化碳基光催化剂提供了一条新途径。

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