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Single‐Crystalline Nanomesh Tantalum Nitride Photocatalyst with Improved Hydrogen‐Evolving Performance
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2017-09-14 , DOI: 10.1002/aenm.201701605 Mu Xiao 1 , Bin Luo 1 , Miaoqiang Lyu 1 , Songcan Wang 1 , Lianzhou Wang 1
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2017-09-14 , DOI: 10.1002/aenm.201701605 Mu Xiao 1 , Bin Luo 1 , Miaoqiang Lyu 1 , Songcan Wang 1 , Lianzhou Wang 1
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Tantalum nitride (Ta3N5) with a suitable bandgap (≈2 eV) is regarded as one of the most promising photocatalysts for efficient solar energy harvesting and conversion. However, Ta3N5 suffers from low hydrogen production activity due to the low carrier mobility and fast carrier recombination. Thus, the design of Ta3N5 nanostructures to facilitate charge carrier transport and improve photocatalytic performance remains a challenge. This study reports a new type of ultrathin (≈2 nm) Ta3N5 nanomesh with high specific surface area (284.6 m2 g−1) and excellent crystallinity by an innovative bottom‐up graphene oxide templated strategy. The resulting Ta3N5 nanomeshes demonstrate drastically improved electron transport ability and prolonged lifetime of charge carriers, due to the nature of high surface area and excellent crystallinity. As a result, when used as photocatalysts, the Ta3N5 nanomeshes exhibit a greater than tenfold improvement in solar hydrogen production compared to bulk counterparts. This work provides an effective and generic strategy for designing 2D ultrathin nanomesh structures for nonlayered materials with improved catalytic activity.
中文翻译：
具有改善析氢性能的单晶纳米网状氮化钽光催化剂
具有合适的带隙（≈2eV）的氮化钽（Ta 3 N 5）被认为是有效收集和转化太阳能的最有希望的光催化剂之一。然而，由于低的载流子迁移率和快速的载流子重组，Ta 3 N 5具有低的产氢活性。因此，设计Ta 3 N 5纳米结构以促进电荷载流子传输并改善光催化性能仍然是一个挑战。这项研究报告了一种新型的超薄（≈2nm）Ta 3 N 5纳米网，具有高比表面积（284.6 m 2 g -1）和创新的自下而上的氧化石墨烯模板化策略，具有出色的结晶度。由于高表面积和优异的结晶性，所得的Ta 3 N 5纳米网证明电子传输能力大大提高，电荷载流子寿命延长。结果，当用作光催化剂时，与本体对应物相比，Ta 3 N 5纳米网在太阳能制氢方面显示出大于十倍的改进。这项工作为设计具有改善的催化活性的非层状材料设计二维超薄纳米网状结构提供了有效且通用的策略。
更新日期：2017-09-14
中文翻译：
具有改善析氢性能的单晶纳米网状氮化钽光催化剂
具有合适的带隙（≈2eV）的氮化钽（Ta 3 N 5）被认为是有效收集和转化太阳能的最有希望的光催化剂之一。然而，由于低的载流子迁移率和快速的载流子重组，Ta 3 N 5具有低的产氢活性。因此，设计Ta 3 N 5纳米结构以促进电荷载流子传输并改善光催化性能仍然是一个挑战。这项研究报告了一种新型的超薄（≈2nm）Ta 3 N 5纳米网，具有高比表面积（284.6 m 2 g -1）和创新的自下而上的氧化石墨烯模板化策略，具有出色的结晶度。由于高表面积和优异的结晶性，所得的Ta 3 N 5纳米网证明电子传输能力大大提高，电荷载流子寿命延长。结果，当用作光催化剂时，与本体对应物相比，Ta 3 N 5纳米网在太阳能制氢方面显示出大于十倍的改进。这项工作为设计具有改善的催化活性的非层状材料设计二维超薄纳米网状结构提供了有效且通用的策略。
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