共查询到20条相似文献，搜索用时 15 毫秒
1.
通过碳辅助法和溶胶-凝胶法制备了具有可见光下光催化制氢性能的TiO2/Co3O4复合纳米颗粒。采用X射线衍射仪(XRD)、透射电子显微镜(TEM)和高分辨率透射电子显微镜(HRTEM), 以及紫外可见分光光度计表征了复合纳米颗粒的晶体结构、微观形貌和紫外-可见光谱吸收能力。结果表明, 制备的复合纳米颗粒具有良好的晶型、结构以及紫外可见光吸收能力。实验测试了TiO2/Co3O4复合纳米颗粒在模拟太阳光下的光催化制氢性能, 并研究了其光催化制氢的可重复利用性。结果表明, 在模拟太阳光照射下, 该复合纳米颗粒催化纯水产生氢气的速率约为8.25 μmol/(g·h), 且该复合纳米颗粒具有良好的可重复利用性。 相似文献
2.
Karran Woan Georgios Pyrgiotakis Wolfgang Sigmund 《Advanced materials (Deerfield Beach, Fla.)》2009,21(21):2233-2239
The literature and advances in photocatalysis based on the combination of titania (TiO2) and carbon nanotubes is presented. The semiconductor basis for photocatalysis is introduced for anatase and rutile. Furthermore, the proposed mechanisms of catalytic enhancement resulting from the pairing of the titania semiconductor with either metallic, semiconducting, or defect‐rich carbon nanotubes (CNT) is discussed. Differences are apparent for the mixtures and chemically bonded CNT–TiO2 composites. The article then highlights the recent advances in the synthesis techniques for these composites and their photocatalytic reactions with organic, inorganic, and biological agents. Finally, various applications and challenges for these composite materials are reported. 相似文献
3.
4.
Xueze Chu C.I. Sathish Jae-Hun Yang Xinwei Guan Xiangwei Zhang Liang Qiao Kazunari Domen Shaobin Wang Ajayan Vinu Jiabao Yi 《Small (Weinheim an der Bergstrasse, Germany)》2023,19(41):2302875
Due to the depletion of fossil fuels and their-related environmental issues, sustainable, clean, and renewable energy is urgently needed to replace fossil fuel as the primary energy resource. Hydrogen is considered as one of the cleanest energies. Among the approaches to hydrogen production, photocatalysis is the most sustainable and renewable solar energy technique. Considering the low cost of fabrication, earth abundance, appropriate bandgap, and high performance, carbon nitride has attracted extensive attention as the catalyst for photocatalytic hydrogen production in the last two decades. In this review, the carbon nitride-based photocatalytic hydrogen production system, including the catalytic mechanism and the strategies for improving the photocatalytic performance is discussed. According to the photocatalytic processes, the strengthened mechanism of carbon nitride-based catalysts is particularly described in terms of boosting the excitation of electrons and holes, suppressing carriers recombination, and enhancing the utilization efficiency of photon-excited electron–hole. Finally, the current trends related to the screening design of superior photocatalytic hydrogen production systems are outlined, and the development direction of carbon nitride for hydrogen production is clarified. 相似文献
5.
Pan‐Yong Kuang Ping‐Xuan Zheng Zhao‐Qing Liu Jin‐Long Lei Hao Wu Nan Li Tian‐Yi Ma 《Small (Weinheim an der Bergstrasse, Germany)》2016,12(48):6735-6744
Rational design and development of new‐generation photocatalysts with high hydrogen evolution activity is recognized as an effective strategy to settle energy crisis. To this regard, hybrid photocatalysts of Au quantum dots embedded in rimous cadmium sulfide nanospheres are synthesized by using a simple hydrothermal process followed by photoreduction. The rimous cadmium sulfide nanospheres with rough surface and irregular fissures greatly strengthen their adhesion and interaction with Au quantum dots, which effectively facilitates the separation, restrains the recombination, and accelerates the consumption of photoinduced electron‐hole pairs. Impressively, the highest photocatalytic activity for hydrogen generation (601.2 μmol h?1 g?1) and organic pollutant degradation (100% degradation in 80 min) is obtained by adjusting the Au mass loading to achieve uniform distribution. This work paves new way to the exploitation of highly efficient metal/semiconductor hybrid photocatalysts for clean energy generation and environment restoration. 相似文献
6.
7.
Xiang‐Bing Fan Shan Yu Xian Wang Zhi‐Jun Li Fei Zhan Jia‐Xin Li Yu‐ji Gao An‐Dong Xia Ye Tao Xu‐Bing Li Li‐Ping Zhang Chen‐Ho Tung Li‐Zhu Wu 《Advanced materials (Deerfield Beach, Fla.)》2019,31(7)
Semiconducting quantum dots (QDs) have recently triggered a huge interest in constructing efficient hydrogen production systems. It is well established that a large fraction of surface atoms of QDs need ligands to stabilize and avoid them from aggregating. However, the influence of the surface property of QDs on photocatalysis is rather elusive. Here, the surface regulation of CdSe QDs is investigated by surface sulfide ions (S2?) for photocatalytic hydrogen evolution. Structural and spectroscopic study shows that with gradual addition of S2?, S2? first grows into the lattice and later works as ligands on the surface of CdSe QDs. In‐depth transient spectroscopy reveals that the initial lattice S2? accelerates electron transfer from QDs to cocatalyst, and the following ligand S2? mainly facilitates hole transfer from QDs to the sacrificial agent. As a result, a turnover frequency (TOF) of 7950 h?1 can be achieved by the S2? modified CdSe QDs, fourfold higher than that of original mercaptopropionic acid (MPA) capped CdSe QDs. Clearly, the simple surface S2? modification of QDs greatly increases the photocatalytic efficiency, which provides subtle methods to design new QD material for advanced photocatalysis. 相似文献
8.
9.
Chengxiao Zhao Zupeng Chen Run Shi Xiaofei Yang Tierui Zhang 《Advanced materials (Deerfield Beach, Fla.)》2020,32(28):1907296
With the ambition of solving the challenges of the shortage of fossil fuels and their associated environmental pollution, visible-light-driven splitting of water into hydrogen and oxygen using semiconductor photocatalysts has emerged as a promising technology to provide environmentally friendly energy vectors. Among the current library of developed photocatalysts, organic conjugated polymers present unique advantages of sufficient light-absorption efficiency, excellent stability, tunable electronic properties, and economic applicability. As a class of rising photocatalysts, organic conjugated polymers offer high flexibility in tuning the framework of the backbone and porosity to fulfill the requirements for photocatalytic applications. In the past decade, significant progress has been made in visible-light-driven water splitting employing organic conjugated polymers. The recent development of the structural design principles of organic conjugated polymers (including linear, crosslinked, and supramolecular self-assembled polymers) toward efficient photocatalytic hydrogen evolution, oxygen evolution, and overall water splitting is described, thus providing a comprehensive reference for the field. Finally, current challenges and perspectives are also discussed. 相似文献
10.
Daichi Yazaki Tokuhisa Kawawaki Daisuke Hirayama Masanobu Kawachi Kosaku Kato Sota Oguchi Yuichi Yamaguchi Soichi Kikkawa Yoshiya Ueki Sakiat Hossain D. J. Osborn Fumihiko Ozaki Shunsuke Tanaka Jun Yoshinobu Gregory F. Metha Seiji Yamazoe Akihiko Kudo Akira Yamakata Yuichi Negishi 《Small (Weinheim an der Bergstrasse, Germany)》2023,19(34):2208287
For the realization of a next-generation energy society, further improvement in the activity of water-splitting photocatalysts is essential. Platinum (Pt) is predicted to be the most effective cocatalyst for hydrogen evolution from water. However, when the number of active sites is increased by decreasing the particle size, the Pt cocatalyst is easily oxidized and thereby loses its activity. In this study, a method to load ultrafine, monodisperse, metallic Pt nanoclusters (NCs) on graphitic carbon nitride is developed, which is a promising visible-light-driven photocatalyst. In this photocatalyst, a part of the surface of the Pt NCs is protected by sulfur atoms, preventing oxidation. Consequently, the hydrogen-evolution activity per loading weight of Pt cocatalyst is significantly improved, 53 times, compared with that of a Pt-cocatalyst loaded photocatalyst by the conventional method. The developed method is also effective to enhance the overall water-splitting activity of other advanced photocatalysts such as SrTiO3 and BaLa4Ti4O15. 相似文献
11.
Qiu Li Yuan Yang Zhang Hao Yong Yin Wei Wei Wu 《Journal of Experimental Nanoscience》2016,11(5):359-369
BiOBr ultrathin nanocrystals were prepared by a rapid, simple and low-cost route, and characterised by X-ray diffraction, scanning electron microscope, transmission electron microscopy, energy dispersive X-ray, UV–vis diffuse reflectance spectroscopy and electrochemical impedance spectroscopy analyses. The size of the resulting BiOBr ultrathin nanocrystals is about 60–100 nm in width and 15–20 nm in thickness. The photocatalytic activity of the samples was evaluated in terms of the degradation of RhB. Compared with BiOBr three-dimensional microspheres and P25-TiO2, the BiOBr ultrathin nanocrystals exhibited the best visible-light-induced photocatalytic activity. 相似文献
12.
采用溶胶-凝胶法制备了纳米光催化剂Sm2InNbO7,通过XRD、FE-SEM、BET以及UV-Vis DRS测试对该材料的结构、粒径、比表面积和光吸收性能进行了表征。结果表明,Sm2InNbO7的晶粒尺寸和比表面积与柠檬酸(CA)加入量和煅烧温度有关。着重考察了不同条件下制备的Sm2InNbO7系列催化剂的光催化分解水产氢活性。实验结果表明,当CA与金属阳离子(Nb5++Sm3++In3+)的物质的量的比为2、煅烧温度为1073K时,获得的Sm2InNbO7纳米粉体具有最高的光催化产氢活性,测得的8h内平均产氢速率为8.32μmol/h,为固相法制备的Sm2InNbO7粉体的产氢速率的2.2倍。 相似文献
13.
14.
15.
16.
17.
Photocatalysis: Alkali‐Assisted Synthesis of Nitrogen Deficient Graphitic Carbon Nitride with Tunable Band Structures for Efficient Visible‐Light‐Driven Hydrogen Evolution (Adv. Mater. 16/2017) 
下载免费PDF全文
下载免费PDF全文 Huijun Yu Run Shi Yunxuan Zhao Tong Bian Yufei Zhao Chao Zhou Geoffrey I. N. Waterhouse Li‐Zhu Wu Chen‐Ho Tung Tierui Zhang 《Advanced materials (Deerfield Beach, Fla.)》2017,29(16)
18.
Shatila Sarwar Amit Nautiyal Jonathan Cook 袁一斐 李俊豪 Sunil Uprety Reza Shahbazian-Yassar 王瑞刚 Minseo Park Michael J.Bozack 张新宇 《SCIENCE CHINA Materials》2020,(1):62-74
用于析氢反应(HER)的低成本、高效能催化剂对于推进基于清洁氢气的能源工业非常重要.二维二硫化钼(MoS2)具有显著的催化性能,因而已被人们广泛深入研究.然而,大多数现有的合成方法耗时、复杂且效率较低.本文通过超快(60秒)微波引发的方法生产MoS2/石墨烯催化剂.石墨烯的高比表面积和导电性为MoS2纳米片的生长提供了有利的导电网络和快速电荷转移动力.文中制备的MoS2/石墨烯纳米复合材料在酸性介质中对HER表现出优异的电催化活性,具有62 mV的低起始电位,高阴极电流和43.3mV/dec的Tafel斜率.除了优异的催化活性外, MoS2/石墨烯还具有较长的循环稳定性,在250 mV的过电位下阴极电流密度高达1000 mA cm^-2.此外, MoS2/石墨烯催化剂在30–120°C范围内具有出色的HER活性和36.51 kJ mol^-1的低活化能,提供了潜在的大批量生产和制备的机会. 相似文献
19.