Journal of Nanostructures最新文献_第6页

Electrochemical and Microstructural Investigation of in-situ Grown CNTs Network on Carbon Paper as Electrocatalytic Electrode for Fuel Cells 碳纳米管网络作为燃料电池电催化电极的电化学和微观结构研究

IF 1.4

Journal of Nanostructures Pub Date : 2020-07-01 DOI: 10.22052/JNS.2020.03.012

Hajar Rajaei Litkohi, A. Bahari, R. Ojani

{"title":"Electrochemical and Microstructural Investigation of in-situ Grown CNTs Network on Carbon Paper as Electrocatalytic Electrode for Fuel Cells","authors":"Hajar Rajaei Litkohi, A. Bahari, R. Ojani","doi":"10.22052/JNS.2020.03.012","DOIUrl":"https://doi.org/10.22052/JNS.2020.03.012","url":null,"abstract":"In this study, carbon nanotubes (CNTs) were deposited directly on impregnated Fe/carbon paper (CP) substrate (CNT/CP) utilizing chemical vapor deposition (CVD) process with the aim of using them as electrocatalytic electrode. The influence of wet impregnation conditions and CVD growth parameters on the characteristics of CNTs was investigated. Field emission scanning electron microscopy (FESEM), Energy dispersive spectroscopy (EDS), Transmission electron microscopy (TEM) and Raman spectroscopy were applied to characterize nucleation, growth and morphology of CNTs on CP. Measurement of Contact angle (CA) determined 125.9 and 145.0 ⁰C for CP and CNT/CP that displayed an increase in water repellence and degree hydrophobicity of CNT/CP to 15% than CP. Electrochemical impedance spectroscopy (EIS) analysis indicated the reduction of electrode charge transfer resistance from 5000 ohm value from CNT/CP to ohm value for CP that shows the increment in electrical conductivity of CNTCP. Half-cell test analysis represented that the improvement of performance and the increase of power density to ⁓8 % for Pt/CNT/CP compared to commercial catalyst Pt/C/CP (20 wt%) even with about 42% less Pt loading, can be attributed to strong adhesion of in-situ CNTs to the CP and lower agglomeration of CNTs along with outstanding electrical and thermal conductivity of CNTs. The obtained results indicated that the proposed nanostructure serves as a promising candidate for many technological applications specially carbon nanotube-supported catalyst.","PeriodicalId":16523,"journal":{"name":"Journal of Nanostructures","volume":"10 1","pages":"564-580"},"PeriodicalIF":1.4,"publicationDate":"2020-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47058115","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Formation of SiC nanocrystals prepared by sol-gel processing of green carbon sources and DFT calculations 绿碳源溶胶-凝胶法制备SiC纳米晶的形成及DFT计算

IF 1.4

Journal of Nanostructures Pub Date : 2020-07-01 DOI: 10.22052/JNS.2020.03.019

M. Zeraati, K. Tahmasebi, A. Irannejad

引用次数: 3

Effect of alkali strength on the hydrothermal growth of photoactive TiO2 nanowires 碱强度对光活性TiO2纳米线水热生长的影响

IF 1.4

Journal of Nanostructures Pub Date : 2020-07-01 DOI: 10.22052/JNS.2020.03.017

A. Hamisu, U. Gaya, A. Gaya

引用次数: 1

Co3O4 Nanoparticles : Synthesis, Characterization and Its Application as Performing Anode in Li-Ion Batteries 纳米Co3O4的合成、表征及其在锂离子电池中的应用

IF 1.4

Journal of Nanostructures Pub Date : 2020-07-01 DOI: 10.22052/JNS.2020.03.014

A. D. Khalaji, M. Jarošová, P. Machek, Kunfeng Chen, D. Xue

引用次数: 1

Synthesis and characterization of MnFe2O4@ZnO-GO and MnFe2O4@ZnO-rGO nanocomposites with evaluation of improved Photocatalytic performance Under Sun Light MnFe2O4@ZnO-GO和MnFe2O4@ZnO-rGO纳米复合材料的合成、表征及对其光催化性能的评价

IF 1.4

Journal of Nanostructures Pub Date : 2020-07-01 DOI: 10.22052/JNS.2020.03.013

Azam Zamani, A. Mahjoub, M. Sadjadi

{"title":"Synthesis and characterization of MnFe2O4@ZnO-GO and MnFe2O4@ZnO-rGO nanocomposites with evaluation of improved Photocatalytic performance Under Sun Light","authors":"Azam Zamani, A. Mahjoub, M. Sadjadi","doi":"10.22052/JNS.2020.03.013","DOIUrl":"https://doi.org/10.22052/JNS.2020.03.013","url":null,"abstract":"We have fabricated novel MnFe2O4@ZnO–GO and MnFe2O4@ZnO–rGO nanocomposites through chemical facile hydrothermal procedure at low temperature of 180 °C for 3h.We reported the successfully synthesis of the MnFe2O4@ZnO nanocomposite via the co-precipitation method and was calcined at 200 °C for 3 h. Our synthesis of MnFe2O4@ZnO modified by the different weight percentages of GO and rGO.The as-synthesized samples were investigated by techniques XRD, FE-SEM, EDS, TEM,FT-IR,UV-DRS, PL, BET. TEM observations have displayed that MnFe2O4@ZnO nanoparticles were deposited on the graphene oxide and reduced graphene oxide surface. Magnetic studies demonstrated that the MnFe2O4@ZnO–GO and MnFe2O4@ZnO–rGO nanocomposites can be used as a magnetically separable photocatalyst.The photodegradation efficiency of the prepared materials was evaluated by the decomposition of Congo Red (CR) in 35 min of natural sunlight irradiation. Among the synthesized materials, the MnFe2O4@ZnO-GO photocatalyst showed maximum photocatalytic activity(99.54 % ).We also investigated the role of some scavengers in the degradation procedures to study the effect of active species. The studies from the radical scavengertests showed that active radicals like •O2 -, e, h+, and •OH were involved in the photodegradation of CR dye. The experimental results were applied to illustrate the proposed mechanism ability for improved photocatalysis. The Kinetics investigations have revealed that the degradation of CR by the prepared photocatalysts follows the pseudo-first-order kinetics and the rate constant attained for MnFe2O4@ZnO-GO (k = 78.10-3 min−1) was higher than of MnFe2O4@ZnO-rGO (k = 57.10−3 min−1).","PeriodicalId":16523,"journal":{"name":"Journal of Nanostructures","volume":"10 1","pages":"581-606"},"PeriodicalIF":1.4,"publicationDate":"2020-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46527664","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

The Synthesized Reduced Graphene Oxide Enhanced the Capacitive Behavior of Activated Carbon/PVA as Potential Electrode Materials 合成的还原氧化石墨烯增强了活性炭/聚乙烯醇作为电位电极材料的电容性

IF 1.4

Journal of Nanostructures Pub Date : 2020-04-01 DOI: 10.22052/JNS.2020.02.009

Nurhafizah Disa, Shi Yuan Khor, K. L. Tan, Soga Tetsuo

{"title":"The Synthesized Reduced Graphene Oxide Enhanced the Capacitive Behavior of Activated Carbon/PVA as Potential Electrode Materials","authors":"Nurhafizah Disa, Shi Yuan Khor, K. L. Tan, Soga Tetsuo","doi":"10.22052/JNS.2020.02.009","DOIUrl":"https://doi.org/10.22052/JNS.2020.02.009","url":null,"abstract":"In this work, activated carbon (AC) derived from biomass wastes was implemented as electrode materials in supercapacitor application. This study has adopted rubber seed shell (RSS) wastes to derive AC via pyrolysis process. Meanwhile, reduced graphene oxide (rGO) was used as an additive material in order to study the effect of the rGO in capacitive behavior. The synthesized rGO was successfully produced through the electrochemical exfoliation method then further chemically reduced the solution using hydrazine hydrate. Four different electrodes were fabricated using a spin coating method to investigate the effect of added rGO to the capacitive behavior. One sample of AC/polyvinyl alcohol (PVA) as reference was prepared with ratio 2:8. Meanwhile, the three samples were prepared with different volumes of rGO. A series of techniques to characterize the morphological and structural properties of the samples have been carried out using field emission scanning electron microscopy (FESEM), energy dispersive x-ray (EDX), atomic force microscopy (AFM), and Brunauer-Emmett-Teller (BET) surface analysis. Based on the cyclic measurements, AC/PVA/rGO2 showed the lowest resistivity which was 3.74 and consequently enhanced at least 10 orders in capacitive performance as compared to bare AC/PVA. Therefore, the capability of small amount rGO in enhancing the capacitive behavior paves the way for versatile practical applications in the electronic field.","PeriodicalId":16523,"journal":{"name":"Journal of Nanostructures","volume":"10 1","pages":"296-306"},"PeriodicalIF":1.4,"publicationDate":"2020-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45343935","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Adsorption of Gas Molecules on Graphene Doped with Mono and Dual Boron as Highly Sensitive Sensors and Catalysts 掺杂单硼和双硼的石墨烯对气体分子的高灵敏度传感器和催化剂的吸附

IF 1.4

Journal of Nanostructures Pub Date : 2020-04-01 DOI: 10.22052/JNS.2020.02.003

S. A. Khudair, H. Jappor

{"title":"Adsorption of Gas Molecules on Graphene Doped with Mono and Dual Boron as Highly Sensitive Sensors and Catalysts","authors":"S. A. Khudair, H. Jappor","doi":"10.22052/JNS.2020.02.003","DOIUrl":"https://doi.org/10.22052/JNS.2020.02.003","url":null,"abstract":"First-principle calculations have been investigated to study the adsorption of the molecules (SO2, CO, NH3, CO2, NO2, and NO) on the surface of mono boron (B) B-doped and dual B-doped graphene sheets to explore their potential applications as sensors. Our findings indicate that the adsorption of (CO and NH3) on B-doped graphene and (CO and SO2) on dual B-doped graphene are weak physisorption with adsorption energy between (0.128 to 0.810) eV. However, the adsorption of (CO2, NO2, SO2, and NO) on B-doped graphene and (CO2, NH3, NO and NO2) on dual B-doped graphene are strong chemisorption. The strong interaction of (CO2, NO2, SO2, and NO) on B-doped graphene and (CO2, NH3, NO and NO2) on dual B-doped graphene demonstrating that B-doped graphene and dual B-doped graphene could catalyse or activate, suggesting the possibility of B-doped graphene and dual B-doped graphene as a catalyst. Moreover, the energy gap of B-doped graphene and dual B-doped graphene is opened upon adsorption of (CO, CO2, NH3, NO, NO2 and SO2) in various ways. Our calculations demonstrate the feasibility of B-doped graphene may be a good sensor for (CO and NH3) and dual B-doped graphene could be a good sensor for (CO and SO2).","PeriodicalId":16523,"journal":{"name":"Journal of Nanostructures","volume":"10 1","pages":"217-229"},"PeriodicalIF":1.4,"publicationDate":"2020-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43658600","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 7

Effect of Silica Content on Support-Iridium Active Phase Interactions on the Nanocatalyst Activity 二氧化硅含量对载体-铱活性相相互作用对纳米催化剂活性的影响

IF 1.4

Journal of Nanostructures Pub Date : 2020-04-01 DOI: 10.22052/JNS.2020.02.014

Z. Amirsardari, Akram Dourani, F. Hasanpour, Mohamad Ali Amirifar, Nooredin Ghadiri Massoom

{"title":"Effect of Silica Content on Support-Iridium Active Phase Interactions on the Nanocatalyst Activity","authors":"Z. Amirsardari, Akram Dourani, F. Hasanpour, Mohamad Ali Amirifar, Nooredin Ghadiri Massoom","doi":"10.22052/JNS.2020.02.014","DOIUrl":"https://doi.org/10.22052/JNS.2020.02.014","url":null,"abstract":"To discuss the potential role of the support for iridium catalyst, we have proceeded to prepare a series of supported catalysts with the same active phase content, but different silica content, to elucidate the changes in surface structure and the reaction process of hydrous hydrazine decomposition on catalyst. The obtained iridium catalysts contained 20 wt% of nanoparticles dispersed on spherical mesoporous alumina and aluminosilicate supports for hydrogen generation from hydrous hydrazine. Iridium nanoparticles with different morphologies and diameters could be produced over the catalyst supports depending on its nature. The iridium catalysts were characterized by some techniques such as XRD, FESEM, BET, TGA, H2-TPR, and mechanical properties. The type of catalyst support played an important role in the effectiveness of the catalyst particles, leading to different activities for hydrazine monohydrate decomposition. Under the given test conditions, the performance of the catalyst was better when using alumina granular as the catalyst support than when using aluminosilicate granular. Since the aluminosilicate support was less reactive than the alumina, hydrogen selectivity was relatively small; consequently, the reaction rate was lower when using the aluminosilicate support than when using the alumina support.","PeriodicalId":16523,"journal":{"name":"Journal of Nanostructures","volume":"10 1","pages":"348-361"},"PeriodicalIF":1.4,"publicationDate":"2020-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48085763","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Size-controlled synthesis of gold nanostars and their characterizations and plasmon resonances 金纳米星的尺寸控制合成及其表征和等离子体共振

IF 1.4

Journal of Nanostructures Pub Date : 2020-04-01 DOI: 10.22052/JNS.2020.02.001

M. Monsefi, T. Tajerian, A. Rowan

引用次数: 0

Hydroxypropyl Starch Nanoparticles as Controlled Release 羟丙基淀粉纳米颗粒的控释

IF 1.4

Journal of Nanostructures Pub Date : 2020-04-01 DOI: 10.22052/JNS.2020.02.012

S. Chin, Asniar Salim, S. Pang

引用次数: 2