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首页> 外文期刊>RSC Advances >Designing 2D–2D g-C3N4/Ag:ZnIn2S4 nanocomposites for the high-performance conversion of sunlight energy into hydrogen fuel and the meaningful reduction of pollution
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Designing 2D–2D g-C3N4/Ag:ZnIn2S4 nanocomposites for the high-performance conversion of sunlight energy into hydrogen fuel and the meaningful reduction of pollution

机译：设计2D-2D G-C3N4 / AG：Znin2S4纳米复合材料，用于阳光能量的高性能转化为氢气和污染的有意义减少

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The generation of hydrogen-based energy and environmental remediation using sunlight is an emerging topic of great significance for meeting the ever-growing global need. However, the actual photocatalytic performance is still far below expectations because of the relatively slack charge-carrier separation and migration as well as insufficient spectral absorption in semiconductors. Therefore, the rational construction of heterojunctions is considered as an effective approach to solving the above issues. In this context, we have, for the first time, designed and synthesized a two-dimensional 2D-on-2D heterostructure, based on 2D Ag-doped ZnIn _(2) S _(4) nanoplates deposited on 2D g-C _(3) N _(4) nanosheets (denoted as g-C _(3) N _(4) /Ag:ZnIn _(2) S _(4) ). This construct benefits from improved visible-light absorption by unveiling a greater number of catalytically active sites, effectively enhancing charge-carrier separation and relocation. Detailed analysis has proved that under visible-light irradiation, the optimized g-C _(3) N _(4) /20 wt% Ag:ZnIn _(2) S _(4) nanocomposite has substantially upgraded photocatalytic activity in hydrogen formation by water splitting (hydrogen evolution rate of up to 597.47 μmol h ~(?1) g ~(?1) ) and in residual dyestuff degradation (methyl orange, MO; degradation rate constant of 0.1406 min ~(?1) ). Noteworthily, these two exceptionally high values respectively represent 30.73 and 5.42 times enhancements vs. results obtained with bare g-C _(3) N _(4) . Another strong point of our g-C _(3) N _(4) /Ag:ZnIn _(2) S _(4) is its impressive recyclability for 20 runs, with no relevant metal release in the aqueous solution following photocatalysis. This work introduces new, superior access to highly efficient photocatalysts founded on 2D/2D nanocomposites serving both the production of hydrogen as an energy carrier and environmental remediation.
机译：使用阳光的氢基能量和环境修复的产生是一种具有重要意义，可满足不断增长的全球需求的重要课题。然而，由于相对松弛的电荷 - 载流子分离和迁移以及半导体中的光谱吸收不足，因此实际的光催化性能仍远低于预期。因此，异质结的合理构建被认为是解决上述问题的有效方法。在这种情况下，我们拥有第一次设计和合成二维2D-ON-2D异质结构，基于沉积在2D GC _（3）上沉积的2D Ag掺杂的Znin _（2）Sα（4）纳米载体（3 ）N _（4）纳米片（表示为GC _（3）N _（4）/ AG：Znin _（2）S _（4））。这种构造通过揭示更多数量的催化活性位点，有效地增强电荷载流子分离和重新定位，从改善的可见光吸收中受益。详细分析证明，在可见光照射下，优化的GC _（3）N _（4）/ 20wt％AG：Znin _（2）S _（4）纳米复合物在水中基本上升级了氢形成的光催化活性分裂（氢进化率高达597.47μmolH〜（α1）g〜（α1））和残留染料降解（甲基橙，Mo;降解速率常数为0.1406分钟〜（？1））。值得注意的是，这两个极高的值分别代表30.73和5.42倍的增强与裸G-C _（3）n _（4）获得的结果。我们的G-C _（3）N _（4）/ AG：Znin _（2）S_（4）是其令人印象深刻的20次运行的令人印象深，在光催化后，在水溶液中没有相关金属释放。这项工作推出了新的，高效的光催化剂，以2D / 2D纳米复合材料成立的高效光催化剂，用于生产氢气作为能量载体和环境修复。

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