ZnxCd1-xS/bacterial cellulose bionanocomposite foams with hierarchical architecture and enhanced visible-light photocatalytic hydrogen evolution activity
ZnxCd1-xS/bacterial cellulose bionanocomposite foams with hierarchical architecture and enhanced visible-light photocatalytic hydrogen evolution activity
复制标题
具有分层结构和增强可见光催化析氢活性的ZnxCd1-xS/细菌纤维素生物纳米复合泡沫
DOI：
10.1039/c4ta05722h
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发表时间：
2015
影响因子：
11.9
通讯作者：
Y. Xu
中科院分区：
文献类型：
--
作者：
P. P. Wang;Z. B. Geng;J. X. Gao;R. F. Xuan;P. Liu;Y. Wang;K. K. Huang;Y. Z. Wan;Y. Xu
可见光光催化分解水制氢因其在将太阳能转化为化学能方面的巨大潜力而具有重要的意义。−-xS体系是一种本征的可见光催化剂，具有合适的电子能带结构和光致电子的负还原电势，但析氢速率并不理想。一种常见的提高光催化活性的策略包括加入贵金属和石墨烯等昂贵的助催化剂。在这里，我们首次报道了通过将−纳米颗粒组织到细菌纤维素(BC)的分级结构中，可以实现高可见光催化制氢活性。这是通过模板化矿化和离子交换/种子生长实现的。−/BC生物纳米复合泡沫塑料具有柔性、整体式和层次化多孔结构。优化后的材料在420 nm处的表观量子效率为12%，析氢速率为1450μ−1g−1。−/BC催化剂的整体式性质使催化剂回收和循环利用成为可能。目前的工作表明，将固有的化学性质与多长度尺度结构层次相结合可以提供性能优化。
Visible-light photocatalytic H2 production by water splitting is of great importance for its promising potential in converting solar energy to chemical energy. ZnxCd1−xS-based systems are intrinsic visible-light photocatalysts with appropriate electronic band structure and negative reduction potential of photoexcited electrons; however, the H2 evolution rate is far from satisfactory. A common strategy for improving the photocatalytic activity includes the incorporation of expensive cocatalysts such as noble metals and graphene. Here, we report, for the first time, that high visible-light photocatalytic H2 production activity can be achieved by organizing ZnxCd1−xS nanoparticles into the hierarchical architecture of bacterial cellulose (BC). This is achieved by templated mineralization and ion exchange/seeded growth. The bionanocomposite foams of ZnxCd1−xS/BC are flexible, monolithic and hierarchically porous. The optimized Zn0.09Cd0.91S/BC exhibits a high H2 evolution rate of 1450 μmol h−1 g−1 and an excellent apparent quantum efficiency of 12% at 420 nm. The monolithic nature of ZnxCd1−xS/BC makes catalyst recovery and recycling possible. The current work manifests that the integration of intrinsic chemical properties with multilength scale structural hierarchy affords performance optimization.