SENSORS AND ACTUATORS B-CHEMICAL
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2019
·
IF 6.393
Hongji Li,Junqing Qin,Mingji Li,Cuiping Li,Sheng Xu,Lirong Qian,Baohe Yang
A boron-doped graphene (BG)/boron-doped diamond (BDD) composite film was obtained by continuously growing BDD and BG by chemical vapor deposition. In this process, the sp 3 C C bonds in the diamond phase structure are directly converted into sp 2 C C bonds in graphene to combine the two carbon materials, while BG nanosheets are vertically grown on the exposed planes of BDD crystals. These process features impart the vertical BG (VBG)/BDD film a large specific surface area and high electrocatalytic activity, resulting in an electroactive surface area of 2.35 cm 2 . Electrodeposition can be used to load a large number of Au nanoparticles (NPs) on the VBG/BDD electrode. The Au-VBG/BDD electrode was used to construct an immunosensor capable of simultaneously quantifying carcinoembryonic antigen (CEA) and carcinoma antigen 125 (CA 125) at concentrations of 0.5–100 pg mL –1 and 0.5–100 mU mL –1 , respectively, with corresponding detection limits of 0.15 pg mL –1 and 0.09 mU mL –1 . This method is suitable for the practical detection of CEA, CA125, and other tumor markers in human body fluids, allowing early cancer diagnostics and timely treatment.
研究领域:
材料科学
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分析化学
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生物医学工程
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癌症诊断
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2022
·
IF 7.139
Pan Li,Xinbao Li,Ye Yuan,Yang Wang,Pengfei Shen,Xinbo Zhu,Yingying Zhu
Steam reforming of bio-oil for hydrogen production is a promising green technology. Acetic acid was used as the bio-oil model compound. Experimental and density functional theory calculations were carried out to study the performance of Co/Al 2 O 3 catalysts doped with boron (B) with a 1 wt.%–5 wt.% content. Catalyst characterization by BET, XRD , XPS , NH 3 -TPD, H 2 -TPR, TEM, and TG-DTG was performed. We found that the catalyst performance improved significantly by B doping. Under the reaction conditions of T = 500 °C, steam-to-carbon ratio (S/C) = 5, and liquid hourly space velocity (LHSV) = 4.3 h −1 , the catalyst with a B doping ratio of 1 wt.% had the highest hydrogen yield of 85% and a maximum acetic acid conversion rate of 95%. The corresponding hydrogen productivity was 0.8 mmol/min. The stability of this catalyst exceeded 29 h. Density functional theory calculations showed that the interactions between the reaction intermediates and the surface were strengthened with B addition.
研究领域:
化学工程
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材料科学
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催化反应
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Chemistry
·
2022
·
IF 13.599
Yang Ding,Soumyajit Maitra,Chunhua Wang,Runtian Zheng,Meiyu Zhang,Tarek Barakat,Subhasis Roy,Jing Liu,Yu Li,Tawfique Hasan,Bao-Lian Su
Graphitic carbon nitride (g-C 3 N 4 ) has attracted great interest in photocatalysis and photoelectrocatalysis. However, their poor hydrophilicity poses a great challenge for their applications in aqueous environment . Here, we demonstrate synthesis of a hydrophilic bi-functional hierarchical architecture by the assembly of B-doped g-C 3 N 4 nanoplatelets . Such hierarchical B-doped g-C 3 N 4 material enables full utilization of their highly enhanced visible light absorption and photogenerated carrier separation in aqueous medium , leading to an excellent photocatalytic H 2 O 2 production rate of 4240.3 μM g −1 h −1 , 2.84, 2.64 and 2.13 times higher than that of the bulk g-C 3 N 4 , g-C 3 N 4 nanoplatelets and bulk B doped g-C 3 N 4 , respectively. Photoanodes based on these hierarchical architectures can generate an unprecedented photocurrent density of 1.72 mA cm −2 at 1.23 V under AM 1.5 G illumination for photoelectrochemical water splitting. This work makes a fundamental improvement towards large-scale exploitation of highly active, hydrophilic and stable metal-free g-C 3 N 4 photocatalysts for various practical applications.
研究领域:
材料科学
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环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2021
·
IF 5.316
Junchao Qin,Yingying Jiao,Mingquan Liu,Yike Li,Jianshe Wang
Heat treatment strategy has been initially used to prepare boron doped graphite carbon nitride nanodots (BCNDs)/carbon-rich g-C 3 N 4 nanosheets (CNS) heterojunction catalysts. The overall procedure involved three stages. First, BCNDs were prepared by the molten salt method. Next, BCNDs were dispersed onto CNS via heat treatment. Finally, the prepared heterojunction catalysts were test for photocatalytic water splitting hydrogen evolution . The experiment results show that the highest photocatalytic hydrogen evolution activity reached 6260.5 µmol·g −1 ·h −1 , which was approximately 15.7, 7.2 and 3.1 folds higher than that of bulk carbon nitride (bulk C 3 N 4 ), CNS and BCNDs/CNS-H prepared by hydrothermal method , respectively. The enhanced photocatalytic performance may be attributed to the synergistic effect of the formation of heterojunction and the increase of C content in carbon nitride. This work provides reliable guideline for the design of a novel and simple method for composite photocatalyst .
研究领域:
材料科学
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能源科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
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2021
·Vol. 30
·期 5
·3484-3491
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IF 1.819
Gao Yong,Zhang Haibo,Xu Zengshi
Molybdenum trioxide holds the promise of high-performance cathodes for lithium-ion batteries. This study introduces a facile one-step method for large-scale synthesizing B, C co-doped α -MoO 3 single crystals by simultaneous decomposition of boric acid, carburization and vapor deposition on a molybdenum substrate. Experimental characterizations indicate that the B and C co-doping promotes the carrier mobility by inducing impurity states near the Fermi level. Additionally, when subjected to the high voltage, the Mo-C and Mo-B bonds become the controlling factors for enhancing the structural stability through the reduced interplanar spacing which facilitates the restriction of transition-metal ion migration. The target material delivers a high discharge capacity of 305 mAh g −1 with initial Coulombic efficiency of 98%, and shows remarkable cycle stability with a specific capacity of 280 mAh g −1 after 80 cycles. This study sheds light on a new strategy for designing and controlling of the doping activity in other transition-metal-oxides for next-generation lithium-ion batteries.
研究领域:
材料科学
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电化学
✓ 已验证
DOI
高影响因子
VACUUM
·
2024
·
IF 3.8
Bian Zhentao,Ye Ziyan,Zhang Yiru,Ye Ru,Zhu Yanyan,Liu Chengcheng,Zhang Pinghua,Wang Hongyan,Chen Chong,Zhuo Xin,Zhang Keying
In this work, nitrogen, fluorine, and boron tri-doped flower-like porous carbons were prepared from sodium carboxymethyl starch (CMS) by using potassium hydroxide (KOH) as an activator and ammonium borofluoride (NH 4 FB 4 ) as a heteroatomic dopant. The specific surface area ( S BET ), total pore volume ( V t ), pore size distribution (PSD), heteroatom content and electrochemical performance of the samples were directly determined by the KOH content. The optimized material (CMS-F/B/N-4) showed a flower-like porous structure with a large S BET (666 m 2 g −1 ) and an appreciable amount of heteroatoms (oxygen: 8.01 at.%, nitrogen: 1.56 at.%, fluorine: 2.22 at.% and boron: 0.75 at.%). Owing to these merits, the supercapacitor based on CMS-F/B/N-4 displayed a maximum specific capacitance ( C g ) of 219.2 F g −1 at 1 A g −1 and a high performance, with more than 72.5% of initial capacitance was retained when the current density was increased from 1 to 10 A g −1 . In addition, a symmetric cell was assembled with a wide voltage range of 2.0 in 1 M Na 2 SO 4 aqueous electrolyte, delivering a relatively high energy density of 26.47 Wh kg −1 at 500 W kg −1 and stable performance of ∼99% retention after 10,000 cycles. This study demonstrated the feasibility of fabricating porous carbon with specific morphology and heteroatom doping from natural polysaccharide polymers. The findings indicate an avenue toward practical applications of carbon-based supercapacitors.
研究领域:
材料科学
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能源存储
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2019
·Vol. 23
·期 8
·2377-2390
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IF 2.531
Wang Shuangshuang,Feng Jianwei,Meng Qinghan,Cao Bing,Tian Guiying
The search for highly efficient carbon materials with high desalting capacity for the brackish water desalination is still indispensable. In this study, boron and nitrogen co-doped graphene xerogels are prepared by a simple sol-gel method with atmospheric drying and carbonization, in which the rod-like primary particles are attached on the graphene sheets via crosslinking reaction of boric acid-melamine-resorcinol-formaldehyde (BMRF). With the increase in doping ratio, the carbonized BMRF gels display high micropore surface area and abundant doping sites. The maximum doping contents of boron (1.54 at.%) and nitrogen (8.72 at.%) can be achieved in the co-doped graphene xerogel with the molar ratios of C 6 H 6 O 2 and H 3 BO 3 of 1.2, which displays superior specific capacitance (242 F g −1 at a current density of 0.1 A g −1 ) and high capacitance retention (92.7% after 5000 cycles at a current density of 2.0 A g −1 ). The co-doped graphene xerogels are evaluated as electrode materials for the electrochemical desalination of brackish water. Compared to the bare graphene xerogel, the co-doped graphene xerogel displays high electrosorption capacity of 18.45 mg g −1 and high charge efficiency of 45% for NaCl solution under an applied voltage of 1.6 V.
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
Environmental Science-Nano
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2019
·Vol. 7
·期 1
·286-303
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IF 7.704
Changlin Yu,Debin Zeng,Qizhe Fan,Kai Yang,Julan Zeng,Longfong Wei,Junhui Yi,Hongbing Ji
A powerful photocatalyst is the key for photocatalytic environmental purification via sunlight harvesting and utilization. In this work, novel boron doped Sn3O4 microspheres constructed from nanoplates were designed and fabricated. Density functional theory (DFT) studies were carried out to investigate the boron doping mechanism, in which DFT predicted that boron doping would enhance the light harvesting capability and the photo-response of Sn3O4, which was proved by diffuse reflectance spectra (DRS) and transient photocurrent responses. Attributed to its unique porous structure, and enhanced light harvesting and high carrier utilization capabilities, the boron doped Sn3O4 microsphere exhibited high efficiency for Cr(IV) removal and azo dyestuff degradation. Moreover, an unexpected synergistic effect upon simultaneous removal of phenols (phenol, bisphenol A and p-chlorophenol) and Cr(VI) was observed.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
NANOTECHNOLOGY
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2019
·Vol. 31
·期 10
·105707
·
IF 3.399
Zijian Chen,Ting Guo,Zhuangzhi Wu,Dezhi Wang
As highly efficient non-precious metal-based catalysts for the hydrogen evolution reaction (HER), molybdenum carbides have attracted much attention over the phase and structure modification for the improvement of HER performances. In this work, a novel strategy is proposed to modulate phases of molybdenum carbides by boron doping, so that the HER performances can be well controlled. After B-doping, the HER activity of the as-prepared B30 catalyst is significantly enhanced with a much smaller Tafel slope of 78 mV dec−1 than that of the blank one (134 mV dec−1), which originates from the increased amount of active sites, enhanced turnover frequency of each active site and reduced electron transfer resistance. Moreover, this work could broaden our view of phase regulation and provide more possible perspectives for the application in other fields.
研究领域:
材料科学
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化学工程
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能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Jing Liu,Huiyu Dong,Carmen Sans,Xiangjuan Yuan
In this study, a series of boron (B) and oxygen (O) dual doped g-C 3 N 4 (BOCNx) composites with different boric acid dopant dosages were successfully synthesized through one-step thermal condensation method. Amongst, BOCN50 exhibited the best catalytic ozonation activity, achieving 97 % of iopamidol (IPM) degradation within 15 min and the highest k value (0.3166 min −1 ), which was 8 times higher than that of ozonation alone. Multiple characteristic techniques were used to explore the surface properties of BOCNx catalysts and it was found that B and O primarily coordinated in g-C 3 N 4 as the forms of C-O, C = O and B-N bonds. Further investigation in the structure–activity relationship of BOCNx catalyst indicated that the increasing contents of oxygen-containing functional groups and B-N bonds were linearly correlated with the IPM degradation rate. The results of scavenger experiments and ESR analysis demonstrated that the main reactive oxygen species involved were hydroxyl radicals, superoxide radicals, and singlet oxygen ( • OH, • O 2 − and 1 O 2 ). Additionally, up to 12 intermediate products of IPM during the reaction were detected, and the corresponding degradation pathways were elucidated. Finally, the structure of BOCN and the active sites for O 3 adsorption were determined by density functional theory (DFT) calculation, thus providing theoretical support for studying the mechanism of catalytic ozonation degradation.
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
CHEMISTRY-A EUROPEAN JOURNAL
·
2015
·Vol. 21
·期 14
·5617-5622
·
IF 5.731
Yuxin Liu,Ping Liu,Dongqing Wu,Yanshan Huang,Yanping Tang,Yuezeng Su,Fan Zhang,Xinliang Feng
Graphical Doping for better anode s: Boron-doped carbon-coated SnO 2 /graphene hybrids (BCTGs) were fabricated by hydrothermal carbonization of sucrose in the presence of SnO 2 /graphene (TG) nanosheets and phenylboronic acid or boric acid as dopant source to give BSTGs and subsequent thermal treatment (see figure; GO: graphene oxide). Owing to the dopant B atoms in the hybrid and its 2D core–shell architecture, the hybrid obtained with phenylboronic acid as B source exhibits outstanding cycle stability after 360 cycles and an excellent rate capability at high current density. Heteroatom doping is an effective method to adjust the electrochemical behavior of carbonaceous materials. In this work, boron-doped, carbon-coated SnO 2 /graphene hybrids (BCTGs) were fabricated by hydrothermal carbonization of sucrose in the presence of SnO 2 /graphene nanosheets and phenylboronic acid or boric acid as dopant source and subsequent thermal treatment. Owing to their unique 2D core–shell architecture and B-doped carbon shells, BCTGs have enhanced conductivity and extra active sites for lithium storage. With phenylboronic acid as B source, the resulting hybrid shows outstanding electrochemical performance as the anode in lithium-ion batteries with a highly stable capacity of 1165 mA h g −1 at 0.1 A g −1 after 360 cycles and an excellent rate capability of 600 mA h g −1 at 3.2 A g −1 , and thus outperforms most of the previously reported SnO 2 -based anode materials.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
PubMed
高影响因子
Reaction Kinetics Mechanisms and Catalysis
·
2018
·Vol. 125
·期 2
·1179-1190
·
IF 1.515
Mao Yong,Wu Mingzai,Li Guang,Dai Peng,Yu Xinxin,Bai Zhiman,Chen Peng
For highly efficient photodegradation of organic pollutants, the enhancement of photocatalytic activity of metal-free photocatalyst graphitic carbon nitride (g-C 3 N 4 ) under visible light irradiation is meaningful, but still challenging due to the fast recombination of photogenerated electron–hole pairs, low quantum efficiency and specific surface area of pristine g-C 3 N 4 . To address these challenges, boron-doped g-C 3 N 4 together with nitrogen-vacancies (Bd-Nv-C 3 N 4 ) was designed and synthesized through a simple acid-assisted calcination of melamine without any further tedious operations. As expected, based on the synergistic effect of foreign elements doping (boron atoms doping) and intrinsic defects (nitrogen vacancies), the as-prepared novel Bd-Nv-C 3 N 4 photocatalyst shows lower band gap, higher surface area and separation efficiency of photogenerated electron–hole pairs, achieving a nearly tenfold increase of the phtocatalytic constant for methylene blue (MB) degradation compared to that of pristine g-C 3 N 4 without nitrogen-vacancies and boron-doping. This study provides a new train of thought and method for the design and preparation of nonmetal photocatalysts with enhanced visible light irradiation photocatalytic performance.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）