Abstract： Graphene from chitosan (CG) with wrinkle, few layers and specific defects was prepared via a simple method of low carbonization temperature and high KOH activation temperature. At the activation temperature of 1100 °C, the obtained CG-1100 has the specific surface of 1212 m2·g−1 and the total volume of 1.02 cm3·g−1 at the optimized activation temperature. The results show that the CG-1100 is similar to another two graphenes: graphene nanoparticles (GNP) and multilayer graphene powders (MGP), which contain less defects. The Cu/CG-1100 composite photocatalyst was prepared from CG-1100 and Cu(Ac)2 solution with surface plasmon resonance (SPR) effect by in-situ synthesis method under illumination. When the binary composite contains 10 wt% of Cu NPs, the hydrogen evolution rate of Cu/CG-1100 photocatalyst reached 3.94 mmol·g−1·h−1, which is 3.2 times as high as that of pure Cu NPs. Interestingly, the defect sites of the graphene can influence the photocatalytic hydrogen production rate which was observed by depositing Cu NPs on GNP and MGP. The results showed that more defects on the graphene presented higher photocatalytic hydrogen evolution rate.
#1Kelin He(SCAU: South China Agricultural University)H-Index: 7
#2Jun Xie(SCAU: South China Agricultural University)H-Index: 27
Last. Xin Li(SCAU: South China Agricultural University)H-Index: 125
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Developing highly active, non-noble-metal H2 evolution co-catalysts is appealing yet still remains a great challenge in the promising field of visible-light-driven photocatalytic solar fuel H2 production. In this work, high quality hexagonal Ni3C nanoparticles were facilely fabricated through the low-temperature thermolysis of nickel acetylacetonate in oleylamine under a nitrogen atmosphere and were then coupled with g-C3N4 by a simple grinding method. The photocatalytic performances of g-C3N4/N...
#1Piyong Zhang(SCUT: South China University of Technology)H-Index: 15
#2Ting Song(SCUT: South China University of Technology)H-Index: 15
Last. Heping Zeng(SCUT: South China University of Technology)H-Index: 17
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Abstract Cu nanoparticles (NPs) are low-cost plasmonic metals and have been used for photocatalytic hydrogen evolution due to their surface plasmon resonance (SPR) effect. An efficient photocatalyst consisting of plasmonic Cu NPs on reduced graphene oxide (rGO) nanosheets support (Cu/rGO) is successfully prepared by a facile in-situ photoreduction process to form multiple nanoscale junctions for enhancement of photocatalytic hydrogen evolution. Compared to individual Cu NPs, the coupling to rGO ...
Last. Heping Zeng(SCUT: South China University of Technology)H-Index: 17
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Cu NPs (copper nanoparticles) were synthesized in situ on the surface of CuFe2O4 (cuprospinel). The enhancement of the separation efficiency of photogenerated e−/h+ and the catalytic quantum efficiency showed that the LSPR (local surface plasmon resonance) of Cu NPs facilitated the photocatalytic reaction activity of CuFe2O4. And due to the fact that CuFe2O4 was constructed with Cu–O in the tetrahedral site and Fe–O in the octahedral site, the results of DTG and Raman spectra after HER (hydrogen...
Last. Chunxu Pan(WHU: Wuhan University)H-Index: 41
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In this work, we established a one-step strategy to synthesize three-dimensional porous graphitic biomass carbon (PGBC) from bamboo char (BC), and studied its electrochemical performance as electrode materials for supercapacitors. Using potassium ferrate (K2FeO4) to fulfil the synchronous carbonization and graphitization of bamboo carbon, this method is less time-demanding, highly efficient and pollution-free, when compared with a conventional two-step strategy. The as-prepared PGBC sample posse...
#1Piyong Zhang(SCUT: South China University of Technology)H-Index: 15
#2Ting Song(SCUT: South China University of Technology)H-Index: 15
Last. Heping Zeng(SCUT: South China University of Technology)H-Index: 17
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Abstract Exploration of broad spectrum photocatalyst for photocatalytic reaction is of great importance. Cu nanoparticles (NPs) were used for photocatalytic hydrogen evolution due to its surface plasmon resonance (SPR) effect and broad spectrum response. Here, Cu NPs were modified with carbon quantum dots (CQDs) for further improvement of photocatalytic ability. Cu/CQDs composites were prepared by facile in-situ photoreduction and a much higher H2 evolution rate was achieved than that of pure Cu...
The construction of exceptionally robust and high-quality semiconductor–cocatalyst heterojunctions remains a grand challenge toward highly efficient and durable solar-to-fuel conversion. Herein, novel graphitic carbon nitride (g-C3N4) nanosheets decorated with multifunctional metallic Ni interface layers and amorphous NiS cocatalysts were fabricated via a facile three-step process: the loading of Ni(OH)2 nanosheets, high-temperature H2 reduction, and further deposition of amorphous NiS nanosheet...
#1Ting Song(SCUT: South China University of Technology)H-Index: 15
#2Li Zhang(BIT: Beijing Institute of Technology)H-Index: 1
Last. Heping Zeng(SCUT: South China University of Technology)H-Index: 17
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Relatively high photocatalytic H2 production activities can be exhibited by metal–organic framework (MOF) materials using a compulsory cocatalyst or photosensitizer. However, no study has focused on the effect of the crystal structures of MOF materials on the photocatalytic H2 evolution activity when using the same organic ligand and metal ion. Therefore, by connecting the 4′-(2,4-disulfophenyl)-3,2′:6′,3′′-terpyridine (H2DSPTP) organic ligand with CuSO4·5H2O, different MOF photocatalyst crystal...
#1Piyong Zhang(SCUT: South China University of Technology)H-Index: 15
#2Ting Song(SCUT: South China University of Technology)H-Index: 15
Last. Heping Zeng(SCUT: South China University of Technology)H-Index: 17
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A broad spectrum absorption photocatalytic system has been expected for a long time, especially for catalysts where the absorption mainly concentrates on the ultraviolet region, like TiO2. Here, dye sensitization was used to realize this expectation for TiO2. Anatase TiO2 was prepared by a hydrothermal method and then modified with Cu nanoparticles (NPs) by chemical reduction reaction. The highest H2 production rate was 3.33 mmol g−1 h−1 for Cu(3%)–TiO2 (content of Cu NPs was 3 wt%) and for pure...
In this work, robust nanocarbons, including graphite (G), carbon nanotube (CNT), reduced graphene oxide (rGO), carbon black (CB), and acetylene black (AB), have been successfully coupled into the interfaces between g-C3N4 and NiS using a facile precipitation method. The results demonstrated that nanocarbons played trifunctional roles in boosting the photocatalytic H2 evolution over g-C3N4, which can not only act as effective H2-evolution co-catalysts but can also serve as conductive electron bri...
#1Zhaoyong Lin(SYSU: Sun Yat-sen University)H-Index: 20
#2Jiling Li(SYSU: Sun Yat-sen University)H-Index: 5
Last. Guowei Yang(SYSU: Sun Yat-sen University)H-Index: 52
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The supply of clean hydrogen energy through photocatalysis in the future requires the finding of low-cost, efficient and durable cocatalysts to replace noble metal Pt. Cu and Ni are believed to be two promising materials. However, their cocatalytic performance is still limited. The theory of the hydrogen evolution pathway on Cu and Ni surfaces reveals that Cu can release H2 molecules easily but capture H atoms and photoelectrons with difficulty, while Ni performs inversely. To overcome this issu...
Abstract This work presents an effective way of enhancing MoS2-mediated electrocatalytic hydrogen evolution, by exploiting the synergistic effect of reduced graphene oxide (rGO) and NIR light. Various rGO-MoS2 composites were obtained via hydrothermal method. The optimized composite, 0.2rGO-MoS2 exhibited enhanced electrocatalytic hydrogen evolution activity in a wide pH range under NIR irradiation, without adding noble metal. The overpotentials of 0.2rGO-MoS2 at 10 mA cm−2 in acidic and alkalin...
#1Jian Shi(CAS: Chinese Academy of Sciences)H-Index: 6
#2Xuesong Jiang(CAS: Chinese Academy of Sciences)H-Index: 3
Last. Jian Chen(CAS: Chinese Academy of Sciences)H-Index: 133
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Abstract Recovered solar-grade silicon kerf scrap is touted as an ideal silicon source for Si-based anodes in advanced lithium-ion batteries (LIBs) whose development is always troubled by the volume expansion and low conductivity. Here, an effective approach for carbon nanotubes (CNTs) enhanced recovered silicon/carbon anodes encapsulated by polymethyl methacrylate (PMMA)-derived carbon coating (Si/CNTs@PMMA-C) is described. The Si/CNTs@PMMA-C anode presents an impressive Li ion storage capacity...
Abstract Hydrogen (H2) is considered an alternative energy carrier for future clean energy systems in many applications. The three-dimensional (3D) graphene is one of the promising candidates for various applications especially in photocatalytic H2 production due to its high electron conductivity, mechanical stability, fast electron transfer, and large surface area. Exploring the changes in the physical properties from different dimensionalities can be interesting because a 3D structure may impr...
Abstract Plasmonic silver nanoparticle, AgNPs, (∼14.1 nm) having an absorption peak at 421 nm was fabricated via a biogenic, rapid, and costless technique using Banana Waste Peduncles (BWP) as new disposals instead of plant extracts. According to HPLC, BWP included gallic acid, catechin, chlorogenic acid, caffeic acid, etc. Degussa (P25) has been in-situ added in one-step to AgNPs using the microwave synthesis to produce nanocomposite sensitive to solar-light irradiation. Transmission electron m...
Abstract The construction of p-n heterojunction is a workable approach for the expansion of light absorption range and the suppression of charge-carrier recombination to enhance the photocatalytic performance. However, the redox ability of dominant band potential in each semiconductor is restrained by heterostructure. In this work, the reduced graphene oxide (RGO) was used as an adhesive to integrate Cu2O and BiVO4 via a two-step solvothermal method, fabricating a Z-scheme photocatalytic system....
#1Wangxi Liu(SCUT: South China University of Technology)H-Index: 1
#2Ting Wang(SCUT: South China University of Technology)H-Index: 4
Last. Tingting Wang(SCUT: South China University of Technology)H-Index: 14
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Improving the separation of photogenerated electron–hole pairs is considered an effective approach to enhance the photocatalytic activities. Herein, Cu nanoparticles (NPs) are loaded on N-doped graphitic carbon (NGC)/honeycomb-like carbon sphere (HCS), where HCSs is dispersed on the NGC layer, obtaining a novel NGC/HCS/Cu NPs (GCPC) hierarchical structure for photocatalytic hydrogen evolution under simulated sunlight. The intercalation of HCS as the interface mediator plays an important role in ...
Last. Tingting Wang(SCUT: South China University of Technology)H-Index: 14
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Abstract Three-dimensionally (3D) structured Cu nanoparticles (NPs)-embedded graphene hydrogels were synthesized from inexpensive graphite and low-cost copper acetate by a novel self-assembly and in-situ slow-release photoreduction method. The cross-linked microporous 3D reduced graphene oxide framework ensures full contact of the photocatalyst with water and promotes electron transfer. The EDA-reduced Cu-rGH hydrogel with an 11.3% Cu NPs mass ratio exhibits the best hydrogen evolution rate (16....
#1Wei Li(Shaanxi University of Science and Technology)H-Index: 10
#2Xiao Wang(Shaanxi University of Science and Technology)H-Index: 6
Last. Wang Xuechuan(Shaanxi University of Science and Technology)H-Index: 8
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Abstract Hydrogen is known as an alternative new energy for its advantages of non-pollution and high calorific value, and photocatalysis technology is regarded as one of the most effective means to produce hydrogen in recent years. In this topic, aiming at the poor photoresponse, fast combination of photo-induced carriers and unstable structure of traditional photocatalysts, the three-dimensional porous g-C3N4/graphene oxide framework was constructed by compounding two-dimensional graphene oxide...