JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
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IF 9.965
Yanqin Xue,Qing Yan,Xiaojing Bai,Yanyan Xu,Xuan Zhang,Yiju Li,Kai Zhu,Ke Ye,Jun Yan,Dianxue Cao,Guiling Wang
The development of efficient bifunctional catalysts for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) is essential for reducing the cost of hydrogen production by water splitting. Herein, hollow microtubes composed of RuNi 1 Co 1 alloy nanoparticles uniformly embedded in the carbon matrix (RuNi 1 Co 1 @CMT) are prepared through a simple impregnation followed by reduction. Benefiting from the unique mosaic structure and the synergistic effect between Ru and NiCo, RuNi 1 Co 1 @CMT achieves more exposed active sites and improved reaction kinetics. As a consequence, RuNi 1 Co 1 @CMT exhibits considerable catalytic activities with the overpotentials of 78 mV for HER and 299 mV for OER at 10 mA cm −2 in 1 M KOH. In addition, RuNi 1 Co 1 @CMT exhibits excellent stability for up to 30 h in both HER and OER processes at 20 mA cm −2 , which is attributed to the protection of the RuNi 1 Co 1 alloy particles by the carbon layer. Furthermore, the assembled RuNi 1 Co 1 @CMT || RuNi 1 Co 1 @CMT overall water splitting system shows a cell voltage of 1.58 V at 10 mA cm −2 . The density functional theory (DFT) calculations indicate that the addition of Ru can optimize the hydrogen adsorption free energy of Ni and Co sites. Finally, a solar panel-driven water splitting device is built, which can realize green and sustainable hydrogen production. The fabrication of RuNi 1 Co 1 @CMT provides a new way for the preparation of effective alloy nanomaterials for energy storage and conversion.
研究领域:
材料科学
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催化化学
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能源转换
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Polymers
·
2022
·Vol. 14
·期 21
·4501
·
IF 4.967
Yanfang Zhao,Aichun Long,Pengfei Zhao,Lusheng Liao,Rui Wang,Gaorong Li,Bingbing Wang,Xiaoxue Liao,Rentong Yu,Jianhe Liao
Constructing hierarchical structures is indispensable to tuning the electromagnetic properties of carbon-based materials. Here, carbon microtubes with nanometer wall thickness and micrometer diameter were fabricated by a feasible approach with economical and sustainable kapok fiber. The carbonized kapok fiber (CKF) exhibits microscale pores from the inherent porous templates as well as pyrolysis-induced nanopores inside the wall, affording the hierarchical carbon microtube with excellent microwave absorbing performance over broad frequency. Particularly, CKF-650 exhibits an optimized reflection loss (RL) of −62.46 dB (10.32 GHz, 2.2 mm), while CKF-600 demonstrates an effective absorption bandwidth (RL < −10 dB) of 6.80 GHz (11.20–18.00 GHz, 2.8 mm). Moreover, more than 90% of the incident electromagnetic wave ranging from 2.88 GHz to 18.00 GHz can be dissipated by simply controlling the carbonization temperature of KF and/or the thickness of the carbon-microtube-based absorber. These encouraging findings provide a facile alternative route to fabricate microwave absorbers with broadband attenuation capacity by utilizing sustainable biomass.Keywords:biomass-derived carbon microtube;kapok fiber;electromagnetic loss;microwave attenuation
研究领域:
材料科学
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电磁学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
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IF 5.518
Changduo Sun,Min Yu,Yuting Li,Bihui Niu,Fenghui Qin,Na Yan,Yinyin Xu,Yian Zheng
Calotropis gigantea fiber (CGF) is a natural cellulose fiber with thin-walled large lumen. Benefitted from its unique structure, CGF was utilized here as a bio-template for the fabrication of hollow carbon microtubes using a facile hydrothermal method , and simultaneously, nano-sized MoS 2 flowers were in-situ generated along the inner and outside surfaces of carbonized fiber microtubes, forming MoS 2 nanoflowers decorated biochar MoS 2 /CGB. Coupled with dual active centers from non-metallic biochar and metallic MoS 2 , MoS 2 /CGB was then used for activating peroxymonosulfate (PMS) to degrade perfluorooctanoic acid (PFOA), one emerging pollutant that had received wide attention in recent years. The experimental results indicated that at room temperature and pH 3.0, MoS 2 /CGB exhibited the degradation efficiency of 79.6% for PFOA, and removal percentage of 50.7% for total organic carbon . During the degradation process, the free radical (SO 4 •− /•OH) and non-radical ( 1 O 2 ) routes coexisted, and the amount of SO 4 •− was about 9 times that of •OH. Combined with mass spectrometry , the possible degradation pathway of PFOA was proposed as transforming into short chained C2- to C5-containing carboxylic acids. With Vibrio fischeri as an indicator, the acute toxicity of PFOA solution and intermediates was evaluated, with the inhibition rate decreased from 27.6% to 4.5%. Finally, MoS 2 /CGB had the ability not only for removing perfluorinated compounds with different carbon chain lengths, but also for catalytically degrading PFOA in tap water and Yellow River water . This work provides plant fiber-based sustainable catalyst for potential application in PMS-based system for boosting PFOA degradation.
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2024
·Vol. 14
·期 10
·6865-6873
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IF 3.9
Hongjie Wang,Jilun Guan,Mei He,Yanqiu Zhu,Fangchao Cheng
Flexible sensors have promising applications in the fields of health monitoring and artificial intelligence, which have attracted much attention from researchers. However, the design and manufacture of sensors with multiple sensing functions (like simultaneously having both temperature and pressure sensing capabilities) still present a significant challenge. Here, an ionic thermoelectric sensor for synchronous temperature and pressure sensing was developed on the basis of a carbon microtubes (CMTs)/potassium chloride (KCl)/gelatin composite consisting of gelatin as the polymer matrix, CMTs as the conductive material and KCl as the ion source. The designed CMTs/KCl/gelatin composite with the good ductility (830%) and flexibility can achieve a Seebeck coefficient of 4 mV K−1 and a dual stimulus responsiveness to pressure and temperature. In addition, not only the movement of the human body (e.g., fingers, arms), but also the temperature difference between the human body and the environment, were able to be monitored by the designed CMTs/KCl/gelatin sensors. This study provides a novel strategy for the design and preparation of high-performance flexible sensors by utilizing ion-gel thermoelectric materials and promotes the research of temperature and pressure sensing technologies.
研究领域:
材料科学
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生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
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2024
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IF 4.3
Shijun Luo,Shaojia Liang,Jianyang Cui,Yan Guo,Baohe Yuan,Lei Xu,Rui Zheng,Junming Li,Wenpeng Yang,Yang Lu,Yongsong Luo
Aqueous iron-sulfur (Fe–S) batteries are considered to be promising energy storage devices owing to their low cost and environmental friendliness. However, the poor electrical conductivity of its sulfur monomers and intermediate polysulphides leads to poor electrochemical performance. Hence, the carrier material of sulfur assumes a crucial role in its performance. In this study, a method using sycamore tree fruit fluffs through hydrothermal activation is introduced, which successfully synthesizes nitrogen-doped carbon microtubes (NDCM) as a carrier for sulfur cathode material. Among them, nitrogen doping can enhance the electrical conductivity characteristics of carbon materials. The nitrogen-doped carbon microtubes prepared have a large specific surface area of 279.49 m 2 /g and high electrical conductivity. This significantly alleviates the issue of low conductivity in elemental sulfur and intermediate polysulfide compounds, thus enhancing electrochemical performance. The electrochemical results show that it provides a capacity of 232.74 mAh g −1 at a current 0.1 A g −1 , exhibiting good cycling life (79 % capacity retention rate after 50 cycles at a current 0.3 A g −1 ). This study provides a new methodology for utilizing waste biomass as a carrier for sulfur electrodes.
研究领域:
材料科学
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能源技术
✓ 已验证
产品关联
DOI
高影响因子
Water
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2025
·Vol. 17
·期 9
·1342
·
IF 3
Xinyi Zhang,Tian Xia,Ying Meng,Jiaxi Zhang,Gaofeng Chen,Zhaoting Ji,Wenli Qin
Microcystins (MCs) are produced by cyanobacteria blooms in eutrophic water and can cause acute and chronic toxicity and even mortality to animals and humans. Previous MC removal strategies concernedonly highly contaminated water, in which the concentration of the pollutant was considerably larger than that in the natural world. In this study, we developed a composite of TiO2-coated magnetic carbon microtube (C-TiO2-Fe3O4) and used it as a photocatalyst to efficiently remove microcystin-LR (MC-LR) from water under visible light from water. And the huge surface of the carbon microtube dramatically boosted the adsorbability and charge mobility, which lowered the recombination rate of electron–hole pairs, and hence systematically enhanced photocatalytic activity. The combination of adsorption and photodegradation endowed the composite with a better performance in the removal of trace amounts of MC-LR than the C-TiO2. It was found that increasing the contact time and catalyst dosage, acidic environment, and lower initial MC-LR concentration had positive effects on MC-LR removal. The optimum reaction conditions of C-TiO2-Fe3O4was a reaction time of 12.68 min, a catalyst dosage of 0.39 g·L−1, and a pH of 7.72. The C-TiO2-Fe3O4(surface area normalized apparent reaction rate constantsK/SBET= 1.2 × 10−4) presented a higher reaction rate than C-TiO2(K/SBET= 8.4 × 10−5). Moreover, the stable removal capability of C-TiO2-Fe3O4was confirmed over multiple cycles. Finally, the ecological safety performance was also evaluated after visible light illumination. This work paves the way for the development of more efficient and easily separable purifiers for the removal of pollutants and toxins from contaminated water.
研究领域:
环境科学
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材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
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IF 5.6
Qihua Sun,Yan Xu,Weijing Wang,Jun Sun,Jialin Li,Jin Li,Zhaofeng Wu,Haiming Duan
The detection of trimethylamine (TMA) is important not only for assessing the quality of seafood products but also for monitoring the environment. Biomass-derived carbon materials have been used for gas-sensitive detection because of their environmental friendliness, abundance, diversity, and chemical stability. In this work, the green waste of groundsel fibers (GFs) was used as a substrate, and ultrathin SnO 2 nanosheets were successfully grown in situ on GFs via a simple hydrothermal reaction (SnO 2 /CGFs). The structures and morphologies of the materials were characterized to detect TMA gas at room temperature. Compared with pure CGFs, SnO 2 /CGFs showed satisfactory selectivity for TMA (500 ppm), higher sensitivity, and a response/recovery time of 5.5/3.3 s. The SnO 2 /CGF sensor exhibits good long-term stability and repeatability for the detection of TMA gas. It exhibits good linearity in measuring TMA gas in the concentration range of 5–200 ppm with a theoretical detection limit of 0.475 ppm and monitored the spoilage process of sea bass at room temperature. The improved gas-sensitive performance of SnO 2 /CGFs is attributed to the unique microstructure, heterojunction formation, and abundance of oxygen species of SnO 2 on carbon tubes of biomass grown in situ.
研究领域:
材料科学
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环境科学
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食品科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Guansheng Ma,Kaili Zhang,Yuefeng Yan,Boshi Gao,Jun Weng,Guangyu Qin,Seeram Ramakrishna,Xiaoxiao Huang
The unique layered structure and adjustable band gap of transition metal dichalcogenides (TMDs) have prompted extensive investigations into their potential for electromagnetic wave absorption (EWA). Vanadium selenide (VSe 2 ), a notable representative of TMDs, has a larger interlayer spacing (6.1 Å) and higher conductivity (1 × 10 -3 S/m), which has high advantageous in EWA applications. However, the existing research on the use of VSe 2 for EWA remains relatively limited. Herein, a flower-branch-like carbon microtube/vanadium selenide (CMT/VSe 2 ) composite was successfully synthesized via a facile solvothermal method. This composite material is composed of flower-like VSe 2 nanostructures integrated with carbon microtubes. Importantly, the EWA properties of this composite can be effectively tailored by adjusting the concentration of the VSe 2 precursor. The CMT/VSe 2 composite exhibited a remarkable minimum reflection loss (RL) of −60.54 dB in the Ku-band, with a matching thickness of 2.27 mm. Moreover, the effective absorption bandwidth reached 6.38 GHz. These results demonstrate the great potential of this CMT/VSe 2 composite material as a highly efficient EWA material. Furthermore, this work broadens the application of two-dimensional TMDs in the area of EWA.
研究领域:
材料科学
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电磁学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2022
·
IF 16.744
Xiaoyun Zhang,Lili Song,Le Tong,Mengyuan Zeng,Yuqiao Wang
The imitation and exploration of natural structures and characteristics are the inspiration source for science and technology progress. Herein, we report a method for preparing CoP anchored carbon microtubes (CoP@BCMT) by continuous hydrothermal, carbonization and phosphorization processes using cattail fibers (CFs) as carbon sources. The surface hydroxyl (–OH) groups acted as the growth sites for CoP fixed and grew in special positions. Co was anchored to BCMT surface through –OH groups and C-O-Co bonds were formed between CoP and BCMT. Surface bonding can ensure the growth of CoP at specific sites. The ultra-thin carbon layer covered CoP was deposited by the deposition of suspended carbon during CFs carbonization. CoP size, dispersibility and adhesion were maintained well due to surface coating and bonding. C-O-Co bonds promoted electron transfer and optimized adsorption energy of hydrogen, which was evaluated by density functional theory calculations. CoP@BCMT exhibited a low overpotential of 49 mV at current density of 10 mA cm −2 and long-term stability for 72 h. We modified commercial carbon nanotubes with surface hydroxyl groups and then combined with CoP, which greatly improved the catalytic performance. This work provides us with ideas for learning and using biomass to prepare advanced catalysts.
研究领域:
材料科学
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催化化学
✓ 已验证
产品关联
DOI
高影响因子
ChemistrySelect
·
2023
·Vol. 8
·期 13
·e202300298
·
IF 2.1
Hong Du,Jing Zheng,Yi Mao,Wen-tao Pan,Yan Zhang,Lin-yu Zhu,Xue-Bo Yin,Min Zhang
Graphical Herein, magnetic Nitrogen-doped carbon microtubes with Co nanoparticles (Fe 3 O 4 @C−Co) were prepared. The obtained Fe 3 O 4 @C−Co exhibited an excellent catalytic performance due to the synergistic effect between the hollow porous nitrogen-doped carbon support and the dispersed Co nanoparticles. Furthermore, owing to the magnetism of the magnetic Fe 3 O 4 NPs and newly-generated Co NPs, the catalysts could be easily collected and recycled, exhibiting potential application in catalytic and other fields. Heterogeneous catalysts with controllable interface structures are of great importance to demonstrate the relationship between structure and property. Herein, magnetic Nitrogen-doped carbon microtubes with Co nanoparticles (Fe 3 O 4 @C−Co) were prepared, which could be used for the reduction of 4-nitrophenol(4-NP). In the process, MoO 3 @FeOOH core-shell structure was fabricated, then ZIF-67 was decorated on the MoO 3 @FeOOH. After adding 2-methylimidazole, MoO 3 microrods were removed. Then the prepared FeOOH@ZIF-67 microtubes are converted to Fe 3 O 4 @C−Co hybrid microtubes through pyrolysis. Due to the unique structures, the obtained Fe 3 O 4 @C−Co composites improved the dispersion of Co nanoparticles (NPs), diminished Co leaching, and promoted catalytic activity. The plentiful nitrogen improved electronic conductivity and brought additional active sites. The resulting Fe 3 O 4 @C−Co implies outstanding catalytic ability towards the reduction of 4-NP. The synergistic effect between the hollow microtube and the fine dispersed Co NPs within Fe 3 O 4 @C−Co offered an excellent catalytic efficiency. More particularly, this achievement opens a new avenue to the targeted design of well-defined nanocatalysts for practical applications in environmental remediation.
研究领域:
材料科学
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环境科学
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催化化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Wentao Wang,Qizhu Qian,Yapeng Li,Yin Zhu,Yafei Feng,Mingyu Cheng,Huaikun Zhang,Yangyang Zhang,Genqiang Zhang
Hydrazine oxidation-assisted water electrolysis provides a promising way for the energy-efficient electrochemical hydrogen (H2) and synchronous decomposition of hydrazine-rich wastewater, but the development of highly active catalysts still remains a great challenge. Here, we demonstrate the robust and highly active Ru nanoparticles supported on the hollow N-doped carbon microtube (denoted as Ru NPs/H-NCMT) composite structure as HER and HzOR bifunctional electrocatalysts. Thanks to such unique hierarchical architectures, the as-synthesized Ru NPs/H-NCMTs exhibit prominent electrocatalytic activity in the alkaline condition, which needs a low overpotential of 29 mV at 10 mA cm–2 for HER and an ultrasmall working potential of −0.06 V (vs RHE) to attain the same current density for HzOR. In addition, assembling a two-electrode hybrid electrolyzer using as-prepared Ru NPs/H-NCMT catalysts shows a small cell voltage of mere 0.108 V at 100 mA cm–2, as well as the remarkable long-term stability. Density functional theory calculations further reveal that the Ru NPs serve as the active sites for both the HER and HzOR in the nanocomposite, which facilitates the adsorption of H atoms and hydrazine dehydrogenation kinetics, thus enhancing the performances of HER and HzOR. This work paves a novel avenue to develop efficient and stable electrocatalysts toward HER and HzOR that promises energy-saving hybrid water electrolysis electrochemical H2 production.
研究领域:
材料科学
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电化学
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能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 30
·期 11
·29190-29205
·
IF 5.19
Qin Wenli,Chen Zefei,Liu Xueya,Zhang Xinyi,Ai Manqing,Zhang Pingping,Ye Ying,Ma Zengling
Bismuth phosphate (BiPO 4 ), a very attractive candidate for organics electrodegradation, harbors tremendous potential on removing contaminants from water. Here, four carbon microtube electrodes were prepared from corncob, each coated with BiPO 4 by a different method to study the electrodegradation of methylene blue (MB). A thorough insight into the composite features of four electrodes was characterized. Better reversibility and electrocatalytic activity of the fourth electrode (BCC4) prepared by digital signal generator was presented with a current density of 5.71 mA cm −2 at a potential of 1.6 V vs Ag/AgCl. The electrochemical impedances and actual lifetime of BCC4 were 125 Ω and 833 h, respectively. The effectiveness of each kind of BiPO 4 /carbon electrode was preliminarily evaluated by analyzing the actual conversion rate of the MB concentration, which confirms MB electrodegradation by the BiPO 4 /carbon electrode was mainly dominated by the hydroxyl radical oxidation. The mass transfer rate was increased by carbon microtube; thereby, electrocatalysis of BiPO 4 /carbon electrode increased as revealed by an increase in the MB degradation rate. The rate constants k obtained for the degradation of MB by BiPO 4 /carbon electrode at 20 ℃ was 0.0046 mM −1 s −1 , which was 11 times than that of BiPO 4 . The diffusion layer was decreased by carbon microtube, resulting in MB electrodegradation rate increased. The BiPO 4 coated on the surface of the carbon microtube electrodes strengthened their electrocatalytic performance, which shed new light on effective selection of suitable carbon electrode for degradation of organics. Therefore, BiPO 4 /carbon electrode could be potentially applied in the electrodegradation of organic pollutants. Graphical Abstract
研究领域:
环境科学
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电化学
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水处理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）