JOURNAL OF ALLOYS AND COMPOUNDS
·
2016
·
IF 3.014
Yitao Wu,Yinyan Gong,Jiaqi Liu,Zhen Zhang,Yan Xu,Hui Ren,Can Li,Lengyuan Niu
B and Y doped titanium dioxides (TiO 2 ) photocatalysts were synthesized by a sol-gel method followed by calcination . It is observed that the photodegradation efficiency of B and Y co-doped TiO 2 is twice that of undoped sample. To explore the underlining mechanism, x-ray diffraction, Raman, scanning electron microscope, x-ray photoemission, and UV–Vis diffuse reflectance spectroscopy measurements have been carried out to investigate the effect of B and Y doping on the structural, electronic, and optical properties of titania. Experimental observations revealed that in TiO 2 lattice Y 3+ ions tend to replace Ti 4+ ions while B 3+ ions occupy the interstitial sites. The incorporation of interstitial boron dopants will create oxygen vacancies ( Ov ·· ) and reduce Ti 4+ to Ti 3+ to form [ Ov ·· -Ti 3+ ] + complex, which traps the carriers and prolongs carrier lifetime. Moreover, Y 3+ ions can trap the photo-excited electrons to form Y 2+ ions, which will then react with the absorbed O 2 on TiO 2 surface to generate reactive species. In addition, all the doped samples have smaller crystallite sizes . The formation of B interstitials and Y substitutes, and increased surface-to-volume ratio are all beneficial to improve photocatalytic activity.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2022
·
IF 9.794
Yang Tao,Qing Liu,Yujiao Guo,Mingwu Xiang,Xiaofang Liu,Wei Bai,Junming Guo,Shulei Chou
Electrochemical properties of spinel LiMn 2 O 4 cathode material have been always suffered from Mn dissolution and Jahn-Teller distortion. Herein, various Ni/B dual-doped LiNi 0.08 B x Mn 1.92- x O 4 ( x = 0–0.15) with a truncated octahedral morphology are synthesized via a facile solid-state combustion. The effects of Ni/B co-doping on the morphology, crystal structure, Mn dissolution, Li + diffusion coefficient and activation energy are investigated. Due to the relatively high Ni–O and B–O bond energy than that of Mn–O bond, the structure stability of the LiMn 2 O 4 is enhanced, whilst restraining the Jahn-Teller distortion. The LiNi 0.08 Mn 1.92 O 4 shows (111), (110) and (100) facets. In comparison, the B-doping endows the LiNi 0.08 B x Mn 1.92- x O 4 ( x ≥ 0.02) with (111) and (100) facets. This morphology evolution without (110) facets effectively inhibits the Mn dissolution. Owing to the synergistic merits of Ni/B dual-doping and unique truncated octahedron , the optimized LiNi 0.08 B 0.06 Mn 1.86 O 4 delivers an initial discharge capacity of 113.9 mAh∙g −1 at 1C and maintains a durable cycling life up to 2000 cycles at 5C. Even at 20C, a capacity retention of 86.3% is still obtained after 2000 cycles. Furthermore, a capacity retention of 70.6% can be retained after 500 cycles at 5C and 55 °C. The truncated octahedral LiNi 0.08 B x Mn 1.92- x O 4 with excellent electrochemical performance will be a good candidate for developing long-life lithium-ion batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
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2025
·
IF 6.2
Riyi Lin,Ruiqi Liu,Lijuan Wang,Yiya Wang,Ningmin Zhu,Dengyu Chen,Liqiang Zhang
B-doping walnut shell char was prepared by the premodified doping method. The effects of B-doping amount, doping temperature, and coupling activation agent (activator amount, activation temperature) on the physicochemical structure and CO 2 adsorption performance of walnut shell biochar were investigated using BET, SEM, Raman, XRD, FT-IR, and XPS characterization techniques. The results indicated that B-doping walnut shell char exhibited a high specific surface area, and the pore structure was dominated by micropores. As the amount of B-doping increased, the CO 2 adsorption capacity of walnut shell char initially rose and then declined. The optimal doping mass ratio was 2:1, and the best pyrolysis temperature was 800 °C. The biochar pores became more abundant and disorderly after KOH activation. Excessive amounts of activators could damage the pore structure of activated char, thereby reducing the adsorption performance. The optimal mass ratio of the activator to walnut shell char was 1:1. As the activation temperature increased, the adsorption capacity of activated char for CO 2 initially improved and subsequently declined. The optimal activation temperature of walnut shell char was 700 °C. The optimal CO 2 adsorption performance was achieved by the CK1–1–700, which was 76.70 % higher compared to W800 without B-doping. Additionally, CK1–1–700 exhibited good cyclic performance. B-doping and activation treatment significantly enhanced the CO 2 adsorption capacity of walnut shell char. These research findings could serve as a reference for the high-value utilization of biomass.
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
ACTA MATERIALIA
·
2024
·
IF 8.3
He Yang,Fuxi Liu,Xu Zou,Zhou Jiang,Xinyan Zhou,Xiangyu Wu,Sifan Qiao,Wei Zhang,Weitao Zheng
Constructing a robust cathode-electrolyte interface (CEI) layer holds significant potential in enhancing the overall performance of dual-ion batteries (DIBs). However, the regulation of electrolyte components has been mainly focused on, while the negative impact of graphite edge structure is neglected. Herein, B-doped graphite (BDG) with a C-B coordination structure is used as the cathode material for DIB toward constructing a robust CEI layer. The surface C-B coordination is demonstrated to reduce the bond dissociation energy of electrolyte components (LiPF 6 and EMC), allowing for the fast formation of stable and high ionic conductivity CEI layer, which inhibits the continuous decomposition of the electrolyte and ensures the structural integrity of the cathode. Thus, the BDG electrode exhibits excellent rate performance and cycling stability (93.8 % after 1500 cycles at 10 C). Moreover, the as-assembled dual-carbon DIB (BDG as cathode, pre-lithiated graphite as anode) achieves a significant energy density of 178.5 Wh kg ‒1 at the high power density of 4 kW kg ‒1 . This work exerts a profound influence on the design of DIBs holding cost-efficiency, high power density and exceptional cycle life.
研究领域:
材料科学
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电化学
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能源存储
✓ 已验证
DOI
高影响因子
Nanoscale
·
2015
·Vol. 7
·期 19
·8955-8961
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IF 7.394
Tao Yang,Xiwang Chang,Junhong Chen,Kuo-Chih Chou,Xinmei Hou
B-doped 3C-SiC nanowires have been synthesized via a facile and simple carbothermal reduction method at 1500 °C for 2 h in a flowing purified argon atmosphere. The obtained nanowires possess a single crystalline and finned microstructure with fins about 100–200 nm in diameter and 10–20 nm in thickness. The diameter of the inner core stem is about 80 nm on average. Due to the smaller band gap, the finned microstructure and the single crystalline nature, the B-doped 3C-SiC nanowires demonstrate efficient activity as high as 108.4 μmol h−1 g−1 for H2 production, which is about 20 times higher than that of 3C-SiC nanowhiskers and 2.6 times higher than the highest value reported in the literature for SiC materials.
研究领域:
材料科学
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能源科学
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光催化技术
✓ 已验证
DOI
高影响因子
Journal of Physical Chemistry C
·
2022
·
IF 4.177
Kang Hu,Ping Liu,Ziqing Zhang,Ji Bian,Guowei Wang,Hongjun Wu,Hui Xu,Liqiang Jing
g-C3N4 is a promising photocatalyst for CO2 conversion owing to its outstanding reduction potential. However, its shallow valence band position and sluggish water oxidation reaction restrict the overall CO2 photoreduction process. Herein, g-C3N4 nanosheets are first doped with B through thermal treatment of mixed NaBH4 and subsequently modified with highly dispersed Ru-oxo clusters by using tailored chitosan oligomers. The optimal Ru-oxo modified B-doped g-C3N4 exhibits an exceptional photocatalytic CO2 conversion rate with 22-fold improvement compared with pristine CN. Based on the results of electron paramagnetic resonance, atmosphere-controlled surface photovoltage spectroscopy, in situ diffuse reflectance infrared Fourier transform spectroscopy, etc., it is confirmed that the improved photoactivities are attributed to the downward shift of the valence band to obtain the strong driving force for water oxidation along with extension of the visible light response region by B doping and to the capture of photogenerated holes to enhance charge separation and then to accelerate the water oxidation process from the modified Ru-oxo clusters.
研究领域:
材料科学
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化学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Inorganic Chemistry Frontiers
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2020
·Vol. 7
·期 19
·3636-3645
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IF 5.958
Yifei Ye,Dazhi Li,Ping Xu,Jianmin Sun
Until recently, many metal-based catalysts have been developed for the cycloaddition reaction of CO2 with epoxides. However, the leaching of the active metal component would lead to various environmental problems. A novel nonmetal B-doped Lewis acid–base catalyst with hydrogen bond donor (HBD) groups (B-SBA-15-NH2) was prepared successfully through the hydrothermal process and post-modification. B-SBA-15-NH2 exhibited good catalytic performance for the CO2 cycloaddition reaction, and 95% yield of propylene carbonate and satisfied selectivity (98%) were achieved in the presence of the KI cocatalyst. The efficient catalytic activity of B-SBA-15-NH2 resulted from the synergistic effects of B and HBD groups, together with the functionalized –NH2 groups. B-SBA-15-NH2 also exhibited good generality with acceptable yields for the corresponding cyclic carbonates in the CO2 cycloaddition with various epoxides. Furthermore, the developed B-SBA-15-NH2 catalyst could be easily separated by centrifugation and reused for five runs without an obvious loss in activity. The good activity and stable reusability of the metal-free B-SBA-15-NH2 catalyst demonstrate that it is a promising green candidate catalyst in the field of CO2 conversion.
研究领域:
化学工程
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催化材料
·
绿色化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2024
·
IF 12.2
Xin Mao,Junlong Cai,Fazhi Xie,Pengwei Yan,Bin Liu
Catalytic oxidation pretreatment is a significant focus in the field of membrane fouling control; however, traditional catalytic materials are plagued by limitations in catalytic sites and challenges in recovery. In this study, a novel catalyst, B-doped NiFe 2 O x , was prepared with magnetic recovery capabilities and abundant oxygen vacancies to address landfill leachate treatment and mitigate membrane fouling. The results demonstrated the efficient activation of persulfate (PS) by the catalytic sites on B-NiFe 2 O x , which significantly degraded the complex organic pollutants like conjugated double bonds and aromatic compounds in landfill leachate. A large amount of humic acid and soluble microbial products in the landfill leachate were efficiently degraded upon contact with sulfate and hydroxyl radicals produced by B-NiFe 2 O x /PS, thereby resulting in achieving a chemical oxygen demand removal efficiency of up to 72 % and more than a twofold enhancement in filtration flux. Moreover, the characteristics of the fouled layer reveal that the B-NiFe 2 O x /PS system facilitated the formation of a porous cake layer, maximizing the retention of functional groups on the NF270 membrane surface. Notably, a minor presence of B-NiFe 2 O x is uniformly distributed within the cake layer, indicating the in-situ occurrence of weak catalytic oxidation reactions. This study provides an effective and innovative approach utilizing catalytic oxidation for membrane fouling control.
研究领域:
环境科学
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Xin Mao,Junlong Cai,Fazhi Xie,Pengwei Yan,Bin Liu
To address the challenges associated with traditional interface catalytic oxidation membranes, such as preparation complexity, limited reaction sites, and poor reusability, a novel recyclable pre-deposited dynamic catalytic membrane was developed for the first time. Specifically, a B-doped NiFe 2 O x catalyst with magnetic and many oxygen vacancies was synthesized and simply pre-deposited onto the surface of an ultrafiltration membrane to activate peroxydisulfate (PDS). The results indicated that the abundant active catalytic sites on the dynamic deposition layer of B-NiFe 2 O x could efficiently activate PDS, thereby facilitating the generation of active species predominantly comprising sulfate and hydroxyl radicals. As a result, there was a 67.14% significant removal of chemical oxygen demand in secondary effluent. Furthermore, even after 8 cycles of magnetic recovery and re-deposition, the normalized flux of the dynamic catalytic oxidation membrane continued to maintain at 0.52. Notably, unlike conventional interface catalytic oxidation membranes, some B-NiFe 2 O x within the dynamic layer engaged in the catalytic oxidation process in a free form, which maximized the oxidation rate and enhanced membrane in-situ cleaning performance. This research contributes to a comprehensive understanding of utilizing pre-deposited dynamic catalytic oxidation membranes and proposes an effective long-term strategy for membrane in-situ cleaning and wastewater treatment.
研究领域:
环境科学
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化学工程
·
水处理技术
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2020
·Vol. 10
·期 19
·11210-11218
·
IF 3.119
Yan Zhang,Fengsong Qi,Yujian Liu
The high B-doped ordered mesoporous carbon (HPB-OMC) was prepared by using 4-hydroxyphenylboronic acid-modified phenolic resin (HPBPF) as a boron and carbon precursor via the evaporation-induced self-assembly (EISA) approach. The chemical composite, mesoporous structure, and electrochemical properties of the as-prepared HPB-OMC are investigated. The results show that both highly boron-doped and well-ordered mesoporous structure are achieved for HPB-OMCs, owing to the improvement of solubility of the resins in ethanol, and the enhancement of thermal stability of pore channels during carbonization. Moreover, the HPB-OMCs exhibit an ideal electric double-layer capacitor performance. With the increase of the B-doped content, the specific capacitance of the HPB-OMC electrode rises gradually, then drops off a little. The HPB-OMC with a high B content (3.96 wt%) shows a much high specific capacitance of 183 F g−1 at a current density of 1 A g−1, suggesting its promising application in the field of supercapacitors.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Baoji Miao,Yange Cao,Imran Khan,Qiuling Chen,Salman Khan,Amir Zada,Muhammad Shahyan,Sharafat Ali,Rizwan Ullah,Jinbo Bai,Muhammad Rizwan,Abdullah M.S. Alhuthali
The realization of 2D/2D Van der Waals (VDW) heterojunctions represents an advanced approach to achieving superior photocatalytic efficiency. However, electron transfer through Van der Waals heterojunctions formed via ex-situ assembly encounters significant challenges at the interface due to contrasting morphologies and potential barriers among the nanocomposite substituents. Herein, a novel approach is presented, involving the insertion of a phosphate group between copper phthalocyanine (CuPc) and B-doped and N -deficient g-C 3 N 4 (BDCNN), to design and construct a Van der Waals heterojunction labeled as xCu[acs]/yP-BDCNN. The introduction of phosphate as a charge modulator and efficient conduit for charge transfer within the heterojunction resulted in the elimination of spatial barriers and induced electron movement from BDCNN to CuPc in the excited states. Consequently, the catalytic central Cu 2+ in CuPc captured the photoelectrons, leading to the conversion of CO 2 to C 2 H 4 , CO and CH 4 . Remarkably, this approach resulted in a 78-fold enhancement in photocatalytic efficiency compared to pure BDCNN . Moreover the findings confirm that the 2D-2D 4Cu[acs]/9P-BDCNN sheet-like heterojunction effectively boosts photocatalytic activity for persistent pollutants such as methyl orange (MO), methylene blue (MB), rhodamine B (RhB), and tetracycline antibiotics (TCs). The introduction of “interfacial interacting” substances to establish an electron transfer pathway presents a novel and effective strategy for designing photocatalysts capable of efficiently reducing CO 2 into valuable products.
研究领域:
材料科学
·
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Xuan Zhao,Chang Xu,Xi Wang,Jianing Guo,Mingxing Wu
Carbon materials are potential counter electrodes for all−inorganic hole transport layer (HTL)−free perovskite solar cells (PSCs), whereas the defects of the perovskite/carbon back interface are the dominant reason for the low power conversion efficiency (PCE) of this kind of device. To resolve this problem, carbon nanofiber (CNF) was first synthesized using electrospinning technique to construct a carbon counter electrode with porous network architecture by self−supporting nature of CNF. The CsPbBr 3 based all−inorganic HTL−free PSCs using the porous CNF counter electrode shows a PCE of 5.01%. To further modify the CsPbBr 3 /carbon back interface and energy level alignment, mesoporous CNF (m−CNF) and B doped m−CNF (m−BCNF) are synthesized, which can improve the conductivity of the carbon counter electrodes as well as decline the trap state densities and accelerate the carrier extraction and transport properties of the back interface. Accordingly, the all inorganic HTL−free PSCs using m−CNF and m−BCNF counter electrodes generate high PCE of 7.48% and 8.38%, with outstanding long−tern stability. The enhanced PCE improvements can be ascribe to strategies of construction of multilevel network and B doping which can modify the CsPbBr 3 /carbon back interface, optimize the energy level alignment of the device, and enhance the conductivity of the carbon counter electrode. This research is expected to provide meaningful support for development of new counter electrode materials and back interface engineering for high-performance all inorganic HTL−free PSCs.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）