ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Hemdan S. H. Mohamed,Liang Wu,Chao-Fan Li,Zhi-Yi Hu,Jing Liu,Zhao Deng,Li-Hua Chen,Yu Li,Bao-Lian Su
The development of lithium-ion batteries using transition metal oxides has recently become more attractive, due to their higher specific capacities, better rate capability, and high energy densities. Herein, the in situ growth of advanced mesoporous CuO/O-doped g-C3N4 nanospheres is carried out in a two step hydrothermal process at 180 °C and annealing in air at 300 °C. When used as an anode material, the CuO/O-doped g-C3N4 nanospheres achieve a high reversible discharge specific capacity of 738 mAhg–1 and a capacity retention of ∼75.3% after 100 cycles at a current density 100 mAg–1 compared with the pure CuO (412 mAhg–1, 47%) and O-doped g-C3N4 (66 mAhg–1, 53%). Even at high current density 1 Ag–1, they exhibit a reversible discharge specific capacity of 503 mAhg–1 and capacity retention ∼80% over 500 cycles. The excellent electrochemical performance of the CuO/O-doped g-C3N4 nanocomposite is attributed to the following factors: (I) the in situ growing CuO/O-doped g-C3N4 avoids CuO nanoparticle aggregation, leading to the improved lithium ion transfer and electrolyte penetration inside the CuO/O-doped g-C3N4 anode, thus promoting the utilization of CuO; (II) the porous structure provides efficient space for Li+ transfer during the insertion/extraction process to avoid large volume changes; (III) the O-doping g-C3N4 decreases its band gap, ensuring the increased electrical conductivity of CuO/O-doped g-C3N4; and (IV) the strong interaction between CuO and O-doped g-C3N4 ensures the stability of the structure during cycling.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
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2020
·
IF 8.758
Benteng Sun,Zhangqian Liang,Yeye Qian,Xuesong Xu,Ye Han,Jian Tian
Here, we reported that sulfur vacancy-rich O-doped 1T-MoS2 nanosheets (denoted as SV-1T-MoS2) can surpass the activity of Pt as cocatalysts to assist in the photocatalytic nitrogen fixation of CdS nanorods. SV-1T-MoS2 cocatalysts exhibit sulfur vacancies, O-doping, more metallic 1T phase, and high electronic conductivity, thus leading to the exposure of more active edge sites, high Brunauer–Emmett–Teller surface area, enhanced visible light absorption, and improved electron separation and transfer, which are beneficial for photocatalytic nitrogen fixation. Consequently, the optimized 30 wt % SV-1T-MoS2-/CdS composites exhibit an outstanding nitrogen fixation rate of 8220.83 μmol L–1 h–1 g–1 and long-term stability under simulated solar light irradiation, significantly higher than pure CdS nanorods, CdS–Pt (0.1 wt %), and 30 wt % 1T-MoS2/CdS composites. The catalytic mechanism of photocatalytic nitrogen fixation on SV-1T-MoS2 is discussed by density functional theory calculations.
研究领域:
材料科学
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环境科学
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化学
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产品关联
DOI
PubMed
高影响因子
ENERGY & FUELS
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2023
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IF 5.3
Weiwei Zhu,Dekui Shen,Haijiao Xie
The primary objective of this investigation is to assess the electrochemical properties of porous carbon, concurrently doped with nitrogen and oxygen, featuring a diverse array of surface heteroatoms. We synthesized this type of porous carbon material from Houttuynia cordata, subjected to procedures of nitrogen infusion and activation. Our findings indicate a strong relationship between the pseudocapacitance of the dually doped porous carbon and the concentration of pyridinic-nitrogen. As the pyridinic-nitrogen content increases, the pseudocapacitance first increases due to the growing tendency of active sites. After the pyridinic-nitrogen/carbon atomic ratio reaches 0.027, the pseudocapacitance decreases because the conductivity of the carbon material decreases. Density functional theory simulations indicate that the band gap of pyridinic-nitrogen-doped graphene is 0.021 eV, which is larger than that of nitrogen-free graphene. The increased band gap makes electronic transitions less likely, and the conductivity decreases.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
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2016
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IF 5.267
Jun Xiong,Lei Yang,Yanhong Chao,Jingyu Pang,Ming Zhang,Wenshuai Zhu,Huaming Li
Novel BN mesoporous nanowire materials with doped oxygen atoms have been controlled and prepared successfully. Multiple techniques have been employed to determine the structure, morphology, surface feature, defects, and electronic structure. It was the first time that a controlled preparation of this unique structure was applied to adsorptive desulfurization. The obtained BN mesoporous nanowires displayed outstanding adsorptive desulfurization activity for DBT (65.4 mg S g–1 adsorbent according to the Langmuir isotherm model), which was much higher than that of commercial BN and graphene-like BN. At the same time, the BN mesoporous nanowires displayed good stability and excellent adsorption performance for the 4,6-DMDBT (33.2 mg S g–1 adsorbent). The significant enhancement of adsorption desulfurization performance of BN mesoporous nanowires was ascribed to the large number of low coordinated atoms along the nanowire surface and mesopores, which could cause an interaction with DBT, and the doped oxygen atoms further strengthen the interaction.
研究领域:
材料科学
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能源化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
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2025
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IF 7.9
Huyan Shen,Fang Song,Yanyu Li,Hongjie Li,Yiyan Zhu,Shenming Zhu,Keryn Lian,Yao Li,Di Zhang
Pore structure modulation and heteroatom doping are two very important strategies for designing high performance porous carbon materials. Herein, we prepare nitrogen, oxygen and sulfur co-doped hierarchical porous carbon electrode by a scalable ZnO-KOH dual activation treatment of CMC-LS-urea aerogel (CMC: sodium carboxymethyl cellulose; LS: sodium lignosulfonate). The achieved porous carbon material possesses a high specific surface area (2898.2 m 2 g −1 ), hierarchical porous structure (V meso = 0.43 cm 3 g −1 , V micro = 0.93 cm 3 g −1 ) and rich heteroatom contents (O: 17.4 at%; N: 5.96 at% and S: 0.59 at%). The optimal sample demonstrates an exceptional specific capacitance of 342.5 F g −1 at the current density of 0.1 A g −1 and a high capacitance retention rate of 93.7 % after 30000 cycles in 6 M KOH electrolyte. Furthermore, the assembled symmetric capacitors exhibit a high energy density of 33 Wh kg −1 in 1 M TEABF 4 /AN organic electrolyte. This method also can be applied to other natural polymers precursors system for highly efficient and environmentally friendly energy storage.
研究领域:
材料科学
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能源存储
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产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
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2020
·Vol. 44
·期 38
·16320-16328
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IF 3.288
Yuanyuan Yang,Wenting Guo,Yunpu Zhai,Qianwei Jin,Hao Zhao,Ruiqin Zhang,Yonggang Liu
Typical non-metallic semiconductor carbon nitride (CN) has enormous potential in the field of photocatalysis, but the easy recombination of the photo-generated charges severely limits its practical applications. Herein, oxygen-doped and nitrogen vacancy co-modified carbon nitride (ODCN) was prepared by simple reduction and oxidation treatments. The experimental results show that the modified CN can effectively enhance the photocatalytic activity, indicating that there is a synergy between oxygen doping and nitrogen vacancy. The photocatalytic hydrogen generation rate of ODCN is 364 μmol g−1 h−1, which is higher than that of bulk CN, nitrogen vacancy-modified carbon nitride (DCN) and oxygen-doped modified carbon nitride (OCN). As a consequence, our work provides a neoteric idea for the co-modification of carbon nitride by a variety of methods, which can significantly improve the photocatalytic activity of carbon nitride and is expected to be applied in practical applications.
研究领域:
材料科学
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能源科学
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2017
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IF 3.582
Xiao Shang,Jing-Qi Chi,Shan-Shan Lu,Bin Dong,Kai-Li Yan,Wen-Kun Gao,Jing-Bin Zeng,Song Gao,Yong-Ming Chai,Chen-Guang Liu
Highly efficient and metal-free electrocatalysts hold promising in industrial water electrolysis with low cost, environmental friendliness and structural stability in wide pH electrolyte. Herein, N and O dual-doped carbon fiber (CF-O-N) has been hydrothermally synthesized as a three-dimensional (3D) electrocatalyst for oxygen evolution reaction (OER). The co-doping of N and O atoms acts as dual-active-site to improve OER properties, while the rough surface and large pores in CF-O-N electrode may expose abundant active sites and sufficient contacting in catalyst/electrolyte interfaces. CF-O-N electrode behaves excellently for OER with only 130 and 590 mV to generate 10 mA cm −2 and 100 mA cm −2 , respectively. The superior OER property of CF-O-N electrode than single N- or O-doped CF implies the synergistic effect between N and O dopants that may further enhance OER activities. More importantly, dual-doped CF-O-N electrode displays roust stability in 10,000 cycles of cyclic voltammogram (CV) and 12 h chronoamperometry test with unchangeable structures proved by post physical characterizations . It may provide a facile and rational design of self-supported and metal-free materials with excellent activities for water oxidation and holds promising for further industrialization.
研究领域:
材料科学
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能源化学
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产品关联
DOI
高影响因子
Molecular Catalysis
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2023
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IF 4.6
Muyao Li,Zhaolian Zhu,Shiyu Yuan,Liya Ji,Tianhe Zhao,Yan Gao,Hailing Wang
In order to improve the efficiency and reusability of gas diffusion electrodes for hydrogen peroxide (H 2 O 2 ) electrosynthesis, we modified the graphite felt with nitric acid and constructed nitrogen-oxygen co-doped graphite felt/polytetrafluoroethylene/gas diffusion electrodes. The graphite felts before and after nitric acid modification were characterized by SEM, contact angle measurements, FTIR, and XPS, which showed that nitric acid modification resulted in a significant increase of oxygen- and nitrogen-containing functional groups (such as carboxyl groups and pyridinic nitrogen), which could improve the H 2 O 2 yield and current efficiency. The H 2 O 2 yield of the electrode prepared under the optimized modification conditions can reach 42.2 mg·L −1 ·cm −2 , and the current efficiency can be maintained at about 80.0%. The electrode shows relatively stable performance of H 2 O 2 electrogeneration during 13 cycles, and has a promising application prospect.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
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2023
·
IF 6.7
Xinqi Liu,Huiling Yuan,Qian Zheng,Bingyuan Huang,Fang Liao,Hejun Gao,Hongquan Fu,Juan Zhang,Yunwen Liao
The effective capture and storage of radioactive iodine is of great significance to the safe use of nuclear energy. In this study, nitrogen- and oxygen-doped carbon nanotubes acted as effective iodine capture agents in a low concentration of iodine solution of approximately 100 mg L −1 . The iodine uptake capacity is proportionate to hydroxy-functional groups as oxygen species and graphitic nitrogen as nitrogen species, respectively, rather than defects and the specific surface area of carbon nanotubes. The essential adsorption activity of oxygen-doped carbon nanotubes is more than 2.5 times that of nitrogen-doped carbon nanotubes, indicating oxygen-doped carbon nanotubes as a potential carbon material in practical applications for the adsorption of iodine. Theoretical study further deepened the understanding of the iodine adsorption sites on carbon nanotubes. This work provided a new method for the design and synthesis of high-performance radioactive iodine solid adsorbents in the future.
研究领域:
材料科学
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环境科学
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核能安全
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Xiao Shang,Zi-Zhang Liu,Shan-Shan Lu,Bin Dong,Jing-Qi Chi,Jun-Feng Qin,Xien Liu,Yong-Ming Chai,Chen-Guang Liu
The hydrogen evolution reaction activity of carbon-supported Pt catalyst is highly dependent on Pt–C interfaces. Herein, we focus on the relationships between Pt activity and N/O-functionalized hollow carbon sphere (HCS) substrate in acidic media. The electrochemical dissolution of Pt counter electrode is performed to prepare Pt nanoparticles in low loading. The N groups are beneficial for homogeneously sized Pt nanoparticles, whereas the O groups lead to aggregated nanoparticles. Moreover, the proper electronegativity of the N groups may enable capturing of protons to create proton-rich Pt–C interfaces and transfer them onto the Pt sites. The O groups may also capture protons by hydrogen bonding, but the subsequent release of protons is more difficult due to a stronger electronegativity and result in an inferior Pt activity. Consequently, the N-doped HCS with a low Pt loading (1.7 μg cm–2 and 0.05 wt %) possesses a higher intrinsic activity compared with Pt on O-doped HCS. Moreover, it outperforms the commercial 20% Pt/C with a stable operation for 12 h. This work may provide suggestions for constructing the advantageous Pt–C interfaces by proper functional groups for high catalytic efficiencies.
研究领域:
材料科学
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电化学
✓ 已验证
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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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
Journal of Water Process Engineering
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2024
·
IF 6.3
Xu-Dong Miao,Rui-Xiang Zhang,Wen-Tao Li,Qian Wang,Yu-Han Cai,Yong Guo,Ai-Min Li
The increasing environmental risks associated with tetracycline (TC) have been of widespread interest in the development of adsorbents for the efficient treatment of TC. This work synthesized a high-performance boron carbonitride (BCN v O) with nitrogen-vacancies (N v ) and oxygen-doping (O d ) via a hydrogen peroxide mediated strategy. The adsorption capacity of BCN v O-1 for TC (202.85 mg/g) is 1.79 times higher than that of BCN (113.08 mg/g). The adsorption process is well described by the pseudo-second-order kinetic and controlled by surface and intra-pore diffusion. Langmuir can well characterize isothermal adsorption with the fitted maximum adsorption up to 440.53 mg/g. Thermodynamics indicates a spontaneous and endothermic progress in BCN v O-1 adsorption. The abundant pore structures promote pore filling of TC by BCN v O-1. N v and O d enhance BCN v O-1 proton capture, and the captured protons strengthen hydrogen bonding and electrostatic interactions during adsorption. The functional groups, aromatic regions, and B N rings on BCN v O-1 are involved in hydrogen bonding and π-π stacking to TC. BCN v O-1 has high adsorption performance, great environmental appropriateness and thermal regeneration performance, suggesting good prospects for its potential application in environmental wastewater treatment.
研究领域:
环境科学
·
材料科学
✓ 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）