助催化剂硫化钴掺入石墨氮化碳:提升光催化析氢性能及机理探索

IF 9.9 2区 材料科学 Q1 Engineering
Zhangqian Liang , Yanjun Xue , Xinyu Wang , Xiaoli Zhang , Jian Tian , Hongzhi Cui
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引用次数: 7

摘要

二维层状石墨氮化碳(g-C3N4)被认为是一种很有前途的H2生成光催化剂。然而,g-C3N4的光催化析氢(HER)活性受到光载流子复合的显著限制。我们发现,硫化钴(CoS2)作为助催化剂可以促进g-C3N4纳米片(NSs)实现非常有效的光催化制氢。所制备的CoS2/g-C3N4杂化物显示出高度提高的光催化制氢性能和优异的循环稳定性。优化后的7%-CoS2/g-C3N4杂化物的光催化产氢率大大提高,达到36.2​μmol−1​h−1,大约是裸露g-C3N4的180倍(0.2​μmol−1​h−1)。此外,在λ=370的光照下计算了所有样品的表观量子效率(AQE)​实验数据和DFT计算表明,CoS2/g-C3N4杂化物优异的HER活性归因于其较低的过电位和较小的Co-H键活化能。因此,CoS2助催化剂负载有效地提高了g-C3N4对析氢的光催化性能。该项目促进了高效光催化剂和低成本光催化制氢的快速发展。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The incorporation of cocatalyst cobalt sulfide into graphitic carbon nitride: Boosted photocatalytic hydrogen evolution performance and mechanism exploration

2D-layered graphitic carbon nitride (g-C3N4) is regarded as a great prospect as a photocatalyst for H2 generation. However, g-C3N4's photocatalytic hydrogen evolution (HER) activity is significantly restricted by the recombination of photocarriers. We find that cobalt sulfide (CoS2) as a cocatalyst can promote g-C3N4 nanosheets (NSs) to realize very efficient photocatalytic H2 generation. The prepared CoS2/g-C3N4 hybrids display highly boosted photocatalytic H2 generation performance and outstanding cycle stability. The optimized 7%-CoS2/g-C3N4 hybrids show a much improved photocatalytic H2 generation rate of 36.2 ​μmol−1 ​h−1, which is about 180 times as much as bare g-C3N4 (0.2 ​μmol−1 ​h−1). In addition, the apparent quantum efficiency (AQE) of all the samples was computed under light at λ=370 ​nm, in which the AQE of 7%-CoS2/g-C3N4 hybrids is up to 5.72%. The experimental data and the DFT calculation suggest that the CoS2/g-C3N4 hybrid's excellent HER activity is attributable to the lower overpotential and the smaller Co-H bond activation energy for HER. Accordingly, the CoS2 cocatalyst loading effectively boosts the photocatalytic performance of g-C3N4 for H2 evolution. The project promotes fast development of high-efficiency photocatalysts and low-cost for photocatalytic H2 generation.

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来源期刊
Nano Materials Science
Nano Materials Science Engineering-Mechanics of Materials
CiteScore
20.90
自引率
3.00%
发文量
294
审稿时长
9 weeks
期刊介绍: Nano Materials Science (NMS) is an international and interdisciplinary, open access, scholarly journal. NMS publishes peer-reviewed original articles and reviews on nanoscale material science and nanometer devices, with topics encompassing preparation and processing; high-throughput characterization; material performance evaluation and application of material characteristics such as the microstructure and properties of one-dimensional, two-dimensional, and three-dimensional nanostructured and nanofunctional materials; design, preparation, and processing techniques; and performance evaluation technology and nanometer device applications.
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