Well dispersed MoC quantum dots in ultrathin carbon films as efficient co-catalysts for photocatalytic H2 evolution
Well dispersed MoC quantum dots in ultrathin carbon films as efficient co-catalysts for photocatalytic H2 evolution
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超薄碳膜中分散良好的 MoC 量子点作为光催化 H-2 析出的有效助催化剂
DOI：
10.1039/c8ta06029k
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发表时间：
2018-10-21
影响因子：
11.9
通讯作者：
Liu, Ping
中科院分区：
文献类型：
--
作者：
Gao, Fan;Zhao, Yan;Liu, Ping
作为一种很有前途的铂替代品，碳化钼在许多领域得到了广泛的应用。在此，我们开发了一种具有二维片层结构的共催化剂，其中MoC量子点均匀嵌入碳膜（MoC- qds /C）。随着MoC-QDs/C的引入，与纯ZnIn2S4相比，花状MoC-QDs/C/ZnIn2S4复合材料的光催化性能得到了前所未有的提高。MoC-QDs/C/ZnIn2S4的最佳产氢速率几乎是纯ZnIn2S4的48倍。此外，还证实了MoC-QDs/C的增强机理，即MoC-QDs/C能有效地加速载流子的分离，降低光催化水分解过程中析氢过电位。此外，本研究不仅为光催化生产H-2提供了一种高效、有潜力的共催化剂，而且有望提出一种新的含过渡金属碳化物共催化剂的设计方案。
As a promising alternative to Pt, molybdenum carbides have been widely used in many domains. Herein, we develop a co-catalyst with a 2D lamellar structure, in which MoC quantum dots are embedded in a carbon membrane uniformly (MoC-QDs/C). With the introduction of MoC-QDs/C, the flower-like MoC-QDs/C/ZnIn2S4 composite shows an unprecedented enhancement of photocatalytic performance, compared with that of pure ZnIn2S4. The optimal hydrogen generation rate of MoC-QDs/C/ZnIn2S4 is almost 48 times as much as that of pure ZnIn2S4. Besides, the enhancement mechanism is also demonstrated that MoC-QDs/C can accelerate carriers' separation and decrease the overpotential of hydrogen evolution effectively during the photocatalytic water splitting process. Moreover, this study not only provides a high-efficiency and potential co-catalyst for photocatalytic H-2 production, but also is expected to come up with a new design scheme for a transition metal carbide-containing co-catalyst.