Pub Date : 2019-01-08DOI: 10.1504/IJNM.2019.10018334
H. Chen, Long Chen, Peirong Qi, G. Wang, Lei Shi, Xiantao Feng, Feng Yu
We conducted experiments in producing nitrogen-doped carbon foam using pomelo peels as a raw material. Pomelos are a citrus fruit similar in appearance to grapefruit, and native to South and Southeast Asia. Specifically, we fabricated nitrogen-doped pomelo peel derived carbon foam (N-PPCF) by using an ammonia gas treatment. The as-prepared N-PPCF had a high specific surface area of 1,218.5 m2 g−1, an average pore size of 1.36 nm, and a pore volume value of 0.50 cm3 g−1. Additionally, the N-PPCF had a nitrogen content of 8.1%, allowing for a high specific capacitance of 150.1 F g−1 at a density of 1.0 A g−1. Even at 4 A g−1, the N-PPCF still maintained an ideal capacitance of 115.6 F g−1. Ultimately, we believe that nitrogen doped carbon foam is a potential method for treating pomelo peels, and that N-PPCF can function as a potential binder-free supercapacitor electrode.
我们以柚子皮为原料进行了制备氮掺杂碳泡沫的实验。柚子是一种外观类似葡萄柚的柑橘类水果，原产于南亚和东南亚。具体而言，我们通过使用氨气处理制备了氮掺杂柚子皮衍生碳泡沫（N-PPCF）。所制备的N-PPCF具有1218.5 m2 g−1的高比表面积、1.36 nm的平均孔径和0.50 cm3 g−1。此外，N-PPCF的氮含量为8.1%，允许在1.0 a g−1的密度下具有150.1 F g−1高的比电容。即使在4 A g−1的情况下，N-PPCF仍保持115.6 F g−1理想电容。最终，我们相信氮掺杂的碳泡沫是一种潜在的处理柚子皮的方法，并且N-PPCF可以作为一个潜在的无粘合剂超级电容器电极。
{"title":"Creating binder-free supercapacitor electrodes from biomass resources: a nitrogen-doped pomelo peel derived carbon foam","authors":"H. Chen, Long Chen, Peirong Qi, G. Wang, Lei Shi, Xiantao Feng, Feng Yu","doi":"10.1504/IJNM.2019.10018334","DOIUrl":"https://doi.org/10.1504/IJNM.2019.10018334","url":null,"abstract":"We conducted experiments in producing nitrogen-doped carbon foam using pomelo peels as a raw material. Pomelos are a citrus fruit similar in appearance to grapefruit, and native to South and Southeast Asia. Specifically, we fabricated nitrogen-doped pomelo peel derived carbon foam (N-PPCF) by using an ammonia gas treatment. The as-prepared N-PPCF had a high specific surface area of 1,218.5 m2 g−1, an average pore size of 1.36 nm, and a pore volume value of 0.50 cm3 g−1. Additionally, the N-PPCF had a nitrogen content of 8.1%, allowing for a high specific capacitance of 150.1 F g−1 at a density of 1.0 A g−1. Even at 4 A g−1, the N-PPCF still maintained an ideal capacitance of 115.6 F g−1. Ultimately, we believe that nitrogen doped carbon foam is a potential method for treating pomelo peels, and that N-PPCF can function as a potential binder-free supercapacitor electrode.","PeriodicalId":14170,"journal":{"name":"International Journal of Nanomanufacturing","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48757518","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}
Pub Date : 2019-01-08DOI: 10.1504/IJNM.2019.10018333
R. He, X. Gu, Yulong Zhao, Y. Qiang
In this work, Ag3PO4@PANI particles with a core/shell structure were deposited onto the oriented TiO2 nanorod arrays (NRAs) by a facile dipping route, in order to enhance the visible-light response as well as photoelectrochemical (PEC) performance of TiO2 samples. Furthermore, the crystal structure, morphology, and optical properties of the composites (TiO2 photoanodes) were evaluated by a number of techniques, including scanning and transmission electron microscopy (SEM, TEM), X-ray diffractometry (XRD) and UV-vis spectroscopy. Meanwhile, on/off photocurrent response, and impedance spectroscopy measurements as well as Mott-Schottky analysis were employed to make a characterization over TiO2 photoanodes before and after surface modification. A photocurrent density of 4.0 mA cm−2 is achieved at 0.0 V vs. saturated calomel electrode (SCE) under an illumination of 100 mW/cm2, which is ~2 times higher than that of pristine TiO2 photoanode measured under the same conditions. The performance improvement was mainly attributed to the enhanced visible-light response of TiO2.
在这项工作中，通过简单的浸渍方式将具有核/壳结构的Ag3PO4@PANI颗粒沉积在定向TiO2纳米棒阵列(NRAs)上，以提高TiO2样品的可见光响应和光电化学(PEC)性能。此外，通过扫描电子显微镜(SEM)、透射电子显微镜(TEM)、x射线衍射仪(XRD)和紫外可见光谱等多种技术，对复合材料(TiO2光阳极)的晶体结构、形貌和光学性能进行了评价。同时，通过开/关光电流响应、阻抗谱测量以及Mott-Schottky分析对TiO2光阳极表面改性前后进行表征。在100mw /cm2的照度下，饱和甘汞电极(SCE)在0.0 V下获得了4.0 mA cm−2的光电流密度，是在相同条件下测量的原始TiO2光阳极的2倍。性能的提高主要是由于TiO2的可见光响应增强。
{"title":"Surface modification of TiO2 nanorod arrays with Ag3PO4 @ PANI nanoparticles for enhancing photoelectrochemical performance","authors":"R. He, X. Gu, Yulong Zhao, Y. Qiang","doi":"10.1504/IJNM.2019.10018333","DOIUrl":"https://doi.org/10.1504/IJNM.2019.10018333","url":null,"abstract":"In this work, Ag3PO4@PANI particles with a core/shell structure were deposited onto the oriented TiO2 nanorod arrays (NRAs) by a facile dipping route, in order to enhance the visible-light response as well as photoelectrochemical (PEC) performance of TiO2 samples. Furthermore, the crystal structure, morphology, and optical properties of the composites (TiO2 photoanodes) were evaluated by a number of techniques, including scanning and transmission electron microscopy (SEM, TEM), X-ray diffractometry (XRD) and UV-vis spectroscopy. Meanwhile, on/off photocurrent response, and impedance spectroscopy measurements as well as Mott-Schottky analysis were employed to make a characterization over TiO2 photoanodes before and after surface modification. A photocurrent density of 4.0 mA cm−2 is achieved at 0.0 V vs. saturated calomel electrode (SCE) under an illumination of 100 mW/cm2, which is ~2 times higher than that of pristine TiO2 photoanode measured under the same conditions. The performance improvement was mainly attributed to the enhanced visible-light response of TiO2.","PeriodicalId":14170,"journal":{"name":"International Journal of Nanomanufacturing","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43496891","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}
Pub Date : 2019-01-08DOI: 10.1504/IJNM.2019.10018326
Hui Li, Yuqin Liu, Ji Chen, Da Chen, Junkai Tang, Yanxi Deng
Magnesium aluminate spinel nanoparticles were synthesised via chemical precipitation method using ammonia as precipitating agent. The effects of calcination temperature on the phase constitution, morphologies, specific surface area and photocatalytic properties were investigated. Single phase cubic MgAl2O4 formed by calcining the precursors at the temperature ranges from 700°C to 1,000°C for 90 min. The mean crystallite size of the MgAl2O4 powder increases slightly with the increase in calcination temperature. Increasing the calcination temperature leads to decrease in the specific surface area and the decline of the photocatalytic properties. The methylene blue removal ratio reaches 96.3% within 240 min using MgAl2O4 spinel powder calcined at 700°C.
{"title":"Photocatalytic properties of magnesium aluminate spinel nanoparticles prepared by chemical precipitation method","authors":"Hui Li, Yuqin Liu, Ji Chen, Da Chen, Junkai Tang, Yanxi Deng","doi":"10.1504/IJNM.2019.10018326","DOIUrl":"https://doi.org/10.1504/IJNM.2019.10018326","url":null,"abstract":"Magnesium aluminate spinel nanoparticles were synthesised via chemical precipitation method using ammonia as precipitating agent. The effects of calcination temperature on the phase constitution, morphologies, specific surface area and photocatalytic properties were investigated. Single phase cubic MgAl2O4 formed by calcining the precursors at the temperature ranges from 700°C to 1,000°C for 90 min. The mean crystallite size of the MgAl2O4 powder increases slightly with the increase in calcination temperature. Increasing the calcination temperature leads to decrease in the specific surface area and the decline of the photocatalytic properties. The methylene blue removal ratio reaches 96.3% within 240 min using MgAl2O4 spinel powder calcined at 700°C.","PeriodicalId":14170,"journal":{"name":"International Journal of Nanomanufacturing","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42840598","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}
Pub Date : 2019-01-08DOI: 10.1504/IJNM.2019.10018323
Xiaoxi Zhao, Yizhe Zhang, Yongchi Li, W. Liu
The failure process of multi-layer graphene sheets with AB stacking order under shear deformation is simulated using molecular dynamics method with Tersoff potential. Shear stress-strain relationships and shear failure modes of zigzag and armchair graphene sheets are obtained, while the effect of the number of graphene layers on the shear properties of zigzag and armchair graphene sheets is investigated. The results indicate that the shear modulus of graphene sheets is inclined to diverge with the increase of the number of graphene layers. Moreover, the ultimate stress and shear failure strain of zigzag and armchair graphene sheets are reduced gradually with the increase of the number of graphene layers.
{"title":"Molecular dynamics simulation of shear deformation of multi-layer graphene sheets with Tersoff potential","authors":"Xiaoxi Zhao, Yizhe Zhang, Yongchi Li, W. Liu","doi":"10.1504/IJNM.2019.10018323","DOIUrl":"https://doi.org/10.1504/IJNM.2019.10018323","url":null,"abstract":"The failure process of multi-layer graphene sheets with AB stacking order under shear deformation is simulated using molecular dynamics method with Tersoff potential. Shear stress-strain relationships and shear failure modes of zigzag and armchair graphene sheets are obtained, while the effect of the number of graphene layers on the shear properties of zigzag and armchair graphene sheets is investigated. The results indicate that the shear modulus of graphene sheets is inclined to diverge with the increase of the number of graphene layers. Moreover, the ultimate stress and shear failure strain of zigzag and armchair graphene sheets are reduced gradually with the increase of the number of graphene layers.","PeriodicalId":14170,"journal":{"name":"International Journal of Nanomanufacturing","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42961837","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}
Pub Date : 2019-01-08DOI: 10.1504/IJNM.2019.10014844
Jing Gao, Tong Mingxing, W. Lei, Xuanhui Zhang, Guohua Li
Lithium silicate is an important sorbent to capture CO2. Herein, hollow microellipsoids of lithium silicate with mesoporosity were prepared by a hydrothermal method using Na-montmorillonite and lithium hydrate as raw materials. X-ray diffraction, scanning electron microscope and transmission electron microscope analysis show that the crystal phase of the products is composed of lithium silicate and the particle morphology of the sample is hollow microellipsoid at around 600 nm. Furthermore, the wall of the microellipsoid is constituted of mesopores and nanoparticles with a size range within 20 to 40 nm. The specific area and aperture of the samples measured by Brunauer-Emmett-Teller method is 32.3 m2•g−1 and 17.1 nm, respectively. Finally, a formation mechanism of the hollow microellipsoid was proposed to guide further exploration.
{"title":"Hollow microellipsoid lithium silicate with mesoporosity and its formation mechanism","authors":"Jing Gao, Tong Mingxing, W. Lei, Xuanhui Zhang, Guohua Li","doi":"10.1504/IJNM.2019.10014844","DOIUrl":"https://doi.org/10.1504/IJNM.2019.10014844","url":null,"abstract":"Lithium silicate is an important sorbent to capture CO2. Herein, hollow microellipsoids of lithium silicate with mesoporosity were prepared by a hydrothermal method using Na-montmorillonite and lithium hydrate as raw materials. X-ray diffraction, scanning electron microscope and transmission electron microscope analysis show that the crystal phase of the products is composed of lithium silicate and the particle morphology of the sample is hollow microellipsoid at around 600 nm. Furthermore, the wall of the microellipsoid is constituted of mesopores and nanoparticles with a size range within 20 to 40 nm. The specific area and aperture of the samples measured by Brunauer-Emmett-Teller method is 32.3 m2•g−1 and 17.1 nm, respectively. Finally, a formation mechanism of the hollow microellipsoid was proposed to guide further exploration.","PeriodicalId":14170,"journal":{"name":"International Journal of Nanomanufacturing","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48136910","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}
Pub Date : 2019-01-08DOI: 10.1504/IJNM.2019.10018331
Yanxin Bian, Zhonghua Zhang, J. Su, Changming Mao, Guicun Li
Khaki-coloured niobium oxides (H-Nb2O5) nanochains were synthesised via a facile low temperature solution-based method combined with hydrogenation treatment process. The nano-sized chain-like architectures facilitate the fast lithium ion diffusions. Meanwhile, the hydrogen reduction process can effectively endow Nb2O5 with partial Nb4+ species and/or oxygen vacancies, resulting in a large enhancement of its intrinsic electronic conductivity. When evaluated for lithium storage capacity, the H-Nb2O5 showed twice the rate capability at 20 C compared to that of the pristine Nb2O5 nanochains due to the combination of the reduced path and Nb4+ doping induced high electronic conductivity. This facile hydrogenation method is promising for designing high performance carbon-free electrode materials for lithium ion batteries.
{"title":"Khaki-coloured niobium oxide nanochains with enhanced lithium storage performances","authors":"Yanxin Bian, Zhonghua Zhang, J. Su, Changming Mao, Guicun Li","doi":"10.1504/IJNM.2019.10018331","DOIUrl":"https://doi.org/10.1504/IJNM.2019.10018331","url":null,"abstract":"Khaki-coloured niobium oxides (H-Nb2O5) nanochains were synthesised via a facile low temperature solution-based method combined with hydrogenation treatment process. The nano-sized chain-like architectures facilitate the fast lithium ion diffusions. Meanwhile, the hydrogen reduction process can effectively endow Nb2O5 with partial Nb4+ species and/or oxygen vacancies, resulting in a large enhancement of its intrinsic electronic conductivity. When evaluated for lithium storage capacity, the H-Nb2O5 showed twice the rate capability at 20 C compared to that of the pristine Nb2O5 nanochains due to the combination of the reduced path and Nb4+ doping induced high electronic conductivity. This facile hydrogenation method is promising for designing high performance carbon-free electrode materials for lithium ion batteries.","PeriodicalId":14170,"journal":{"name":"International Journal of Nanomanufacturing","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42776854","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}
Pub Date : 2019-01-08DOI: 10.1504/IJNM.2019.10018324
Jinkai Li, Wenzhi Wang, Z. Liu
The (Gd1−xTbx)AlO3 (x = 0-0.12) were obtained through ammonium bicarbonate co-precipitation technology. The pure-phase (Gd1−xTbx)AlO3 with good dispersion could be obtained at relatively lower temperature of 1,000°C. Under optimum UV excitation into 275 nm, the photoluminescence (PL) spectra display a series of 5D4−7FJ transitions of Tb3+ in (Gd1−xTbx)AlO3 system with the strongest green emission at ~546 nm. The overlapping between 8S7/2−6IJ intra f-f transition of Gd3+ and 4f8-4f75d1 transition of Tb3+ at 275 nm suggesting the Gd3+ → Tb3+ energy transfer, and the quenching contents of Tb3+ was found to be ~10 at%. The luminescent property of GdAlO3:Tb3+ phosphor could be further improved with molten salt incorporation. The optimal composition of molten salts was determined to be the mixture of NaCl/Na2SO4 (5 wt% NaCl), and the mass ratio of mixture molten salts to precursor was 2:1. The relationship between the luminescent property and molten salts composition were studied in detail.
{"title":"The luminescent properties of GdAlO3:Tb3+ phosphors based on molten salts addition","authors":"Jinkai Li, Wenzhi Wang, Z. Liu","doi":"10.1504/IJNM.2019.10018324","DOIUrl":"https://doi.org/10.1504/IJNM.2019.10018324","url":null,"abstract":"The (Gd1−xTbx)AlO3 (x = 0-0.12) were obtained through ammonium bicarbonate co-precipitation technology. The pure-phase (Gd1−xTbx)AlO3 with good dispersion could be obtained at relatively lower temperature of 1,000°C. Under optimum UV excitation into 275 nm, the photoluminescence (PL) spectra display a series of 5D4−7FJ transitions of Tb3+ in (Gd1−xTbx)AlO3 system with the strongest green emission at ~546 nm. The overlapping between 8S7/2−6IJ intra f-f transition of Gd3+ and 4f8-4f75d1 transition of Tb3+ at 275 nm suggesting the Gd3+ → Tb3+ energy transfer, and the quenching contents of Tb3+ was found to be ~10 at%. The luminescent property of GdAlO3:Tb3+ phosphor could be further improved with molten salt incorporation. The optimal composition of molten salts was determined to be the mixture of NaCl/Na2SO4 (5 wt% NaCl), and the mass ratio of mixture molten salts to precursor was 2:1. The relationship between the luminescent property and molten salts composition were studied in detail.","PeriodicalId":14170,"journal":{"name":"International Journal of Nanomanufacturing","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42561819","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}
Pub Date : 2019-01-08DOI: 10.1504/IJNM.2019.10018335
H. Chen, Zhuangzhi Zhao, Peirong Qi, Gang Wang, Lei Shi, Feng Yu
Agricultural waste banana peel (BP) as a sustainable biomass resource is used to produce porous carbon (PC) and activated carbon (AC) materials. Sulphur-doped banana peel-derived AC (S-BP-AC) was successfully prepared for supercapacitors. The results show that the S-BP-AC presents a high Brunauer-Emmett-Teller surface area of 2,224.9 m2/g, a large pore volume of 0.77 cm3/g, and a suitable pore-size distribution of approximately 0.8 nm. It is easy to bring S-BP-AC into contact with an electrolyte. The S-BP-AC electrode had great specific capacitance of 162.5 F/g at a current density of 0.5 A/g in a 6 M KOH aqueous electrolyte. The results indicate that the S-BP-AC can be applied to use in high performance supercapacitors.
农业废弃香蕉皮(BP)作为一种可持续的生物质资源，用于生产多孔炭(PC)和活性炭(AC)材料。成功制备了含硫香蕉皮衍生AC (S-BP-AC)超级电容器。结果表明，S-BP-AC具有22224.9 m2/g的高brunauer - emmet - teller表面积，0.77 cm3/g的大孔体积，孔径分布约为0.8 nm。很容易使S-BP-AC与电解质接触。在6 M KOH水溶液中，当电流密度为0.5 a /g时，S-BP-AC电极的比电容达到162.5 F/g。结果表明，S-BP-AC可用于高性能超级电容器。
{"title":"Sulphur-doped banana peel-derived activated carbon as electrode materials for supercapacitors","authors":"H. Chen, Zhuangzhi Zhao, Peirong Qi, Gang Wang, Lei Shi, Feng Yu","doi":"10.1504/IJNM.2019.10018335","DOIUrl":"https://doi.org/10.1504/IJNM.2019.10018335","url":null,"abstract":"Agricultural waste banana peel (BP) as a sustainable biomass resource is used to produce porous carbon (PC) and activated carbon (AC) materials. Sulphur-doped banana peel-derived AC (S-BP-AC) was successfully prepared for supercapacitors. The results show that the S-BP-AC presents a high Brunauer-Emmett-Teller surface area of 2,224.9 m2/g, a large pore volume of 0.77 cm3/g, and a suitable pore-size distribution of approximately 0.8 nm. It is easy to bring S-BP-AC into contact with an electrolyte. The S-BP-AC electrode had great specific capacitance of 162.5 F/g at a current density of 0.5 A/g in a 6 M KOH aqueous electrolyte. The results indicate that the S-BP-AC can be applied to use in high performance supercapacitors.","PeriodicalId":14170,"journal":{"name":"International Journal of Nanomanufacturing","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47662070","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}
Pub Date : 2019-01-08DOI: 10.1504/IJNM.2019.10018329
Qingbin Zhu, Jinghao Liu, Y. Zhong, Guicun Li
Sn nanoparticles encapsulated in hierarchical porous carbon networks ([email protected]) have been synthesised by the carbothermal reduction reaction of sodium stannate-crosslinked sodium polyacrylate xerogel. The synthetic strategy is simple and effective for the scalable production of [email protected] The [email protected] show homogeneous distribution of Sn nanoparticles within hierarchical porous conductive carbon matrix. The obtained [email protected] exhibit high reversible discharge capacity (1,652.1 mAh g−1 at 0.1 A g−1), superior rate performance (499.7 mAh g−1 at 2 A g−1), and excellent cycling stability (553.0 mA h g−1 at 1.5 A g−1 after 150 cycles). The superior lithium storage performances of the [email protected] are due to uniform distribution of Sn nanoparticles within hierarchical porous conductive carbon network, which could not only provide a conductive matrix, but also buffer huge volume change caused by lithiation and thus guarantee integrity of the [email protected] structure.
通过锡酸钠交联聚丙烯酸钠干凝胶的碳热还原反应，合成了包封在分级多孔碳网络中的Sn纳米颗粒（〔email protected〕）。该合成策略简单有效，可用于[电子邮件保护]的可扩展生产。[电子邮件保护]Sn纳米颗粒在分级多孔导电碳基体中均匀分布。所获得的[电子邮件保护]表现出高的可逆放电容量（在0.1 A g−1下为1652.1 mAh g−1）、优异的倍率性能（在2 A g−2下为499.7 mAh g–1）和优异的循环稳定性（150次循环后在1.5 A g−1.5下为553.0 mA h g−2）。〔email protected〕优异的储锂性能是由于Sn纳米颗粒在分级多孔导电碳网络中的均匀分布，这不仅可以提供导电基体，还可以缓冲锂化引起的巨大体积变化，从而保证〔email protective〕结构的完整性。
{"title":"Scalable synthesis of Sn nanoparticles encapsulated in hierarchical porous carbon networks for high-rate reversible lithium storage","authors":"Qingbin Zhu, Jinghao Liu, Y. Zhong, Guicun Li","doi":"10.1504/IJNM.2019.10018329","DOIUrl":"https://doi.org/10.1504/IJNM.2019.10018329","url":null,"abstract":"Sn nanoparticles encapsulated in hierarchical porous carbon networks ([email protected]) have been synthesised by the carbothermal reduction reaction of sodium stannate-crosslinked sodium polyacrylate xerogel. The synthetic strategy is simple and effective for the scalable production of [email protected] The [email protected] show homogeneous distribution of Sn nanoparticles within hierarchical porous conductive carbon matrix. The obtained [email protected] exhibit high reversible discharge capacity (1,652.1 mAh g−1 at 0.1 A g−1), superior rate performance (499.7 mAh g−1 at 2 A g−1), and excellent cycling stability (553.0 mA h g−1 at 1.5 A g−1 after 150 cycles). The superior lithium storage performances of the [email protected] are due to uniform distribution of Sn nanoparticles within hierarchical porous conductive carbon network, which could not only provide a conductive matrix, but also buffer huge volume change caused by lithiation and thus guarantee integrity of the [email protected] structure.","PeriodicalId":14170,"journal":{"name":"International Journal of Nanomanufacturing","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43252272","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}
Pub Date : 2019-01-08DOI: 10.1504/IJNM.2019.10014399
Suyu Shi, Linan Wang, K. Zhao, Chuntai Liu, G. Zheng
In this study, a bipolar membrane (BPM) of sodium alginate (SA) and chitosan (CS) was prepared based on carboxyl multi-walled carbon nanotubes (cMWCNTs). To improve the compatibility of anion-exchange layer and cation-exchange layer, polyvinyl alcohol (PVA) was blended with both the SA and CS, respectively. A casting method was employed to prepare the modified BPM named as cMWCNTs-mSA/mCS BPM for simplicity. The morphology, thermal and structure stability, electrochemical properties and ion penetrability of the BPM were characterised. Scanning electron microscopy (SEM) images illustrate a structure consisting of two distinct layers that are closely combined with each other. Thermal gravimetric (TG) results indicate that the thermal stability of cMWCNTs-mSA/mCS BPM is significantly improved. Swelling behaviour implies a proper hydrophilic performance and excellent structure stability in alkali solution. Compared with SA/CS BPM, the working voltage of cMWCNTs-mSA/mCS BPM is decreased sharply. Furthermore, the cMWCNTs-mSA/mCS BPM exhibited higher ion penetrability which is beneficial for electrochemical synthesis.
{"title":"Preparation and characterization of cMWCNTs-mSA/mCS bipolar membrane for electrochemical synthesis","authors":"Suyu Shi, Linan Wang, K. Zhao, Chuntai Liu, G. Zheng","doi":"10.1504/IJNM.2019.10014399","DOIUrl":"https://doi.org/10.1504/IJNM.2019.10014399","url":null,"abstract":"In this study, a bipolar membrane (BPM) of sodium alginate (SA) and chitosan (CS) was prepared based on carboxyl multi-walled carbon nanotubes (cMWCNTs). To improve the compatibility of anion-exchange layer and cation-exchange layer, polyvinyl alcohol (PVA) was blended with both the SA and CS, respectively. A casting method was employed to prepare the modified BPM named as cMWCNTs-mSA/mCS BPM for simplicity. The morphology, thermal and structure stability, electrochemical properties and ion penetrability of the BPM were characterised. Scanning electron microscopy (SEM) images illustrate a structure consisting of two distinct layers that are closely combined with each other. Thermal gravimetric (TG) results indicate that the thermal stability of cMWCNTs-mSA/mCS BPM is significantly improved. Swelling behaviour implies a proper hydrophilic performance and excellent structure stability in alkali solution. Compared with SA/CS BPM, the working voltage of cMWCNTs-mSA/mCS BPM is decreased sharply. Furthermore, the cMWCNTs-mSA/mCS BPM exhibited higher ion penetrability which is beneficial for electrochemical synthesis.","PeriodicalId":14170,"journal":{"name":"International Journal of Nanomanufacturing","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48312169","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}
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