CHEMICAL ENGINEERING JOURNAL
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2019
·
IF 8.355
Qinghua Deng,Tifang Miao,Ziqun Wang,Yun Xu,Xianliang Fu
Compositional regulation and modification of CdS are effective strategies to enhance its photocatalytic activity and stability. Herein, a series of MoS 2 modified Co 0.2 Cd 0.8 S nanorods (CCS) was synthesized by a hydrothermal method and used for photocatalytic hydrogen evolution reaction (HER) under visible light irradiation. The results indicated that the HER activity and stability of CdS could be substantially improved by the introduction of Co 2+ into CdS lattice, which can accelerate the separation of photoinduced charge carriers and avoid the formation of high oxidation power holes (h + ) due to the upward shift of the valence band edge. The HER performance of CCS could be further enhanced by the decoration of MoS 2 nanosheets. CCS loaded with 5% MoS 2 (wt%) showed the highest activity (2835.6 μmol·g −1 ·h −1 ), which is about 8.9 and 1.6 times higher than that of CdS and CCS. The type II heterojunction formed between CCS and the intimately contacted MoS 2 accounts for the improvement as MoS 2 can serve as trapping centers for photoinduced electrons (e − ) and active sites for HER. This work demonstrated that the activity and the stability of CdS for photocatalytic HER could be boosted by a consolidation of CoS with the host CdS to form a solid solution and a further decoration with low-cost MoS 2 cocatalyst.
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
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2025
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IF 6.3
Jiahe Zhai,Hui Wang,Abdelkader Labidi,Long Zeng,Yu Huang,Chuanyi Wang
Removing low-concentration NO in the air by means of photocatalytic technology is a promising approach. Herein, our work pins down the mechanism of cobalt metal doping within the lattice of Bi 4 Ti 3 O 12 (BTO) for the photocatalytic NO conversion. As a result, the Co-BTO exhibits a NO conversion efficiency of 58.3 %, which is substantially higher than that of BTO (30 %). More interestingly, the Co-BTO also shows a lower production of intermediate NO 2 than that of the BTO. These findings demonstrate that within Co-BTO, both Co²⁺ and Co³ ⁺ coexist. The redox cycle between these two cobalt species engenders active sites possessing strong reducing capabilities for O₂ which can be adsorbed and activated at the Co sites, thereby generating superoxide radicals (•O₂⁻). Furthermore, the doping of a certain portion of cobalt broadened light absorption and enhanced the separation efficiency of photogenerated carriers, further facilitating the activation of O₂. Lastly, electron spin resonance (ESR) and in-situ diffuse reflective infrared Fourier transform spectroscopy (in-situ DRIFTS) were respectively utilized to further clarify the active species involved in the photocatalytic oxidation of NO and its adsorption and conversion pathways from a mechanistic standpoint. Overall, this work represents a novel endeavor for the advancement of visible-light-driven photocatalysts usage for environmental remediation against NO pollution.
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
MOLECULES
·
2024
·Vol. 29
·期 19
·4633
·
IF 4.2
Yan-Fang Li,Li-Fang Wang,Shu-Juan Gao,Tan-Lai Yu,Qi-Feng Li,Jun-Wei Wang
A Co-doped porous carbon was successfully fabricated by a facile carbonizing procedure using coal hydrogasification semi-coke (SC) as the carbon and cobalt nitrate as the magnetic precursors, respectively. The mass ratio of the precursors was changed to regulate the microwave absorption (MA) capabilities. The favorable MA capabilities are a result of a synergistic interaction be-tween the dielectric loss from the carbon framework, the magnetic loss from nano-sized Co particles, and multiple scattering from the residual pores. At a thickness of 4.0 mm, the Co/C composite showed the lowest reflection loss of −33.45 dB when the initial mass ratio of cobalt nitrate and SC was 1:1. The effective absorbing bandwidth (EAB) could achieve 3.5 GHz at 2 mm thickness. This work not only opens up a new avenue for the facile fabrication of dielectric and magnetic loss combinations and their structural design, but it also creates a new route for the high value-added exploitation of SC.
研究领域:
材料科学
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能源与环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Xu Yang,Zhaoxia Zhang,Xiaoyang Wang,Guanghua Wang,Xinlong Tian,Zhifu Wu
Overcoming the limited light harvest and sluggish charge transfer efficiency has remained a long-standing challenge for the practical application of visible-light driven hydrogen evolution . In this work, a novel cobalt doped titanium nitride interlaced nanotube was synthesized through a facile hydrothermal approach and subsequent ammonia gas nitrification route. The optimized Ti 0·75 Co 0·25 N (molar ratio of Ti:Co:N = 0.75:0.25:1) catalyst delivered the highest hydrogen yield in visible-light-induced water splitting, which was almost 2 times higher than the pristine TiN did. Further structure characterizations have unraveled that the cobalt atoms were partially substituted the titanium atoms in crystallite lattice, generating a significant synergistic regulation on band structure and electronic state. As a result, the narrowed energy bandgap, improved charge carrier mobility and lowered over-potential contributed to the high electron-hole separation efficiency and smoothed interface charge transfer, yielding an enhanced photocatalytic activity . This work is a significant contribution to the design of efficient and stable visible light driven water splitting catalysts.
研究领域:
材料科学
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催化化学
✓ 已验证
DOI
高影响因子
RSC Advances
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2016
·Vol. 6
·期 90
·86889-86903
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IF 3.289
H. L. Pan,Q. Q. Liu,Y. H. Zhang,H. T. Wu
Wolframite structure Zn1−xCoxZrNb2O8 (x = 0, 0.02, 0.04, 0.06, 0.08, 0.10) ceramics were prepared by the conventional solid state method. The crystal structures were studied via X-ray diffraction, and lattice vibrational modes were obtained by Raman spectroscopy. It could be found that all the A-site (Zn2+/Co2+, Zr4+) and B-site (Nb5+) cations were octahedrally coordinated with oxygen anions from the diagrammatic sketch of the crystal structure. Rietveld refinement was used to analyze the crystal structure and the lattice parameters were obtained. Based on the complex chemical bond theory and lattice parameters, intrinsic factors such as the bond ionicity, lattice energy, bond energy and coefficient of thermal expansion were calculated. Based on the results, Nb–O bonds played an important role in affecting the microwave dielectric proprieties of Zn1−xCoxZrNb2O8 ceramics. Co2+ substitution would affect the crystal structure and influence the microwave dielectric properties. The tendency of the dielectric constant (εr) could be predicted by the polarizability and bond ionicity of Nb–O bonds, and the εr showed the same tendency with Raman shifts of Nb–O vibration modes. The variation of the quality factor (Qf) could be explained by the change of the lattice energy of Nb–O bonds and the full width at half maximum (FWHM) values of Nb-site Raman modes. The temperature coefficient of resonant frequency (τf) showed the same tendency with the bond energy, octahedral distortion and bond valence of Nb–O bonds, and the opposite tendency with the thermal expansion coefficient.
研究领域:
材料科学
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物理学
✓ 已验证
DOI
高影响因子
Nanoscale
·
2019
·Vol. 11
·期 22
·10992-11000
·
IF 6.97
Junmei Liang,Chaoying Ding,Jiapeng Liu,Tao Chen,WenChao Peng,Yang Li,Fengbao Zhang,Xiaobin Fan
The hydrogen evolution reaction (HER) in alkaline media is key for the cathodic reaction of electrochemical water splitting, but it suffers sluggish kinetics due to the slow water dissociation process. Here, we present a simple strategy to enhance the HER activity in alkaline media by engineering Co-doped MoS2 coupled with Mo2CTx MXene. The improved HER activity might be ascribed to the synergistic regulation of water dissociation sites and electronic conductivity. Co doping could effectively regulate the electronic structure of MoS2 and further improve the intrinsic activity of the catalyst. Mo2CTx MXene served as both the active and conductive substrate to facilitate electron transfer. As a result, the Co-MoS2/Mo2CTx nanohybrids showed dramatically enhanced HER performance with a low overpotential of 112 mV at a current density of 10 mA cm−2 and exhibited excellent long-term stability in alkaline media.
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
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2019
·Vol. 30
·期 6
·5866-5873
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IF 2.195
Zhu Chengyi,Liu Jianxiong,Yu Xiaohua,Zhang Yannan,Zhang Yingjie,Jiang Xiaodong,Wang Sai,Wang Qiang,Dong Peng
Co-doped Li 4 Ti 5 O 12 nanosheets are synthesized via a facile hydrothermal method assisted by mechanical activation technology. The as-prepared Co-doped Li 4 Ti 5 O 12 is characterized by X-ray diffraction, scanning electron microscope and transmission electron microscopy. The morphology measurement shows that the Co-doped Li 4 Ti 5 O 12 still maintain the three-dimensional nanosheet structures and good crystallinity after Co doping. As we expected, Co-doped Li 4 Ti 5 O 12 exhibits higher initial discharge specific capacity, improved cycling performance, and impressive rate capability compared with pristine Li 4 Ti 5 O 12 nanosheets. Even under 20 °C charge/discharge rates, the initial discharge capacity of Co-doped Li 4 Ti 5 O 12 is up to 106 mAh g −1 . The electrochemical impedance spectra measurement further displays that the charge-transfer resistance of Co-doped Li 4 Ti 5 O 12 is much lower than that of pristine one after 20 cycles. The improved electrochemical performance of Co-doped Li 4 Ti 5 O 12 is mainly because the Co doping can effectively enlarge the size of the channel by altering the lattice parameter, which can facilitate Li + diffusion and electron transportation.
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
JOURNAL OF ELECTRONIC MATERIALS
·
2016
·Vol. 45
·期 3
·1935-1941
·
IF 1.491
Zhang Aijuan,Chen Qiufan,Yao Wei,Yang Dingfeng,Wang Guoyu,Zhou Xiaoyuan
The large-scale colloidal synthesis and thermoelectric (TE) properties of Co-doped Cu 2 SnSe 3 (CCTSe) alloys are investigated for the first time. The TE properties of the CCTSe bulks were measured in the temperature range from 300 K to 715 K. A large increment in the Seebeck coefficient and a dramatic reduction in the lattice thermal conductivity was observed in CCTSe compounds, and the dimensionless TE figure␣of merit ZT reaches a peak value of 0.63 at 715 K. These observations demonstrate an exciting scientific opportunity to raise the figure-of-merit of colloidally synthesized quaternary chalcogenide nanocrystals via optimized doping.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
APPLIED GEOCHEMISTRY
·
2024
·
IF 3.1
Yanting Pan,Feng Zhang,Ziyang Zhou,Feng Jiang,Xiaoming Wang,Hui Yin,Wenfeng Tan,Xionghan Feng
A series of cobalt-doped FeS (x% Co–FeS) nanoparticles , prepared via a hydrothermal method, were introduced as catalysts for generating radicals from peroxymonosulfate (PMS) to degrade the endocrine disrupter bisphenol S (BPS) in wastewater. The kinetic results revealed that only a small amount of Co doping (7% At.) could greatly improve the efficiency of PMS activation by FeS, leading to the rapid degradation of BPS (0.21min −1 vs. 0.0046 min −1 ), and no secondary pollution caused by Co leaching. Notably, exceptional activation was observed over a wide pH range from 4 to 11. Moreover, various background ions (NO 3 − , Cl − , CO 3 2− ) and temperatures (10.0–55.0 °C) minimally affected BPS degradation, suggesting excellent applicability in different sewage environments. Furthermore, quenching experiments, coupled with electron paramagnetic resonance technology, identified singlet oxygen ( 1 O 2 ) and sulfate radicals (SO 4 •- ) as the primary reactive oxygen species responsible for BPS degradation. Due to the selectivity of 1 O 2 and the high redox potential of SO 4 •- , this technology had excellent anti-interference and degradation ability. In six repeated batch experiments, the catalysts showed favorable cyclability and stability due to Co(II)/Co(III) cycling mediated by structural S 2− . These results provided insights into the potential applications of modifying natural FeS-type minerals as a promising heterogeneous catalyst for environmental restoration.
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
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Shuang Liu,Qiaofeng Han,Xiaoheng Liu
Utilizing solar energy to produce hydrogen peroxide from oxygen and water offers an appealing and sustainable approach. In this work, Co-doped ZnIn 2 S 4 nanosheets were effectively synthesized through a chemical precipitation method, and the morphological structure, band structure and pathways for hydrogen peroxide production were investigated. The results indicate that Co doping significantly enhances the photocatalytic efficiency of ZnIn 2 S 4 in producing hydrogen peroxide. The sample with the 2 % doping concentration exhibited the highest rate, with a detected hydrogen peroxide concentration of 535.53 µM in the solution after 100 minutes of exposure to visible light, which is 4.29-fold higher than that of undoped ZnIn 2 S 4 . Further analysis revealed that the improved performance mainly originated from better spectral response, faster photogenerated carrier transport, and lower recombination frequency of photogenerated electron-hole pairs.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Mengyao Guo,Sikai Yao,Wenjie Zhang,Qichang Wang,Richen Lin,Daolun Liang,Dekui Shen
The separation and transfer efficiency of photogenerated electron-hole pairs in TiO 2 nanorod is crucial for its photoelectrochemical (PEC) water-splitting performance. A band-matched TiO 2 homojunction photoanode was synthesized through a two-step hydrothermal method, where the anatase TiO 2 shell was controllably grown over Co-doping rutile TiO 2 nanorod arrays. Oxygen vacancies of the rutile TiO 2 nanorods were prominently generated with the doping of Cobalt, regarding the positive shift of the energy bands. The conduction/valence band offsets between rutile and anatase TiO 2 were increased to 0.43 and 0.25 eV, increasing the driving force for the separation of photogenerated electron-hole pairs, effectively suppressing the recombination of carriers. The cobalt doped TiO 2 homojunction photoanode with the anatase shell thickness of 42 nm demonstrated an outstanding PEC performance, with a photocurrent density of 1.45 mA cm −2 at 1.23 V vs. RHE and a hydrogen production rate of 26.17 μmol cm −2 h −1 . The results provided an effective strategy for the development of TiO 2 homojunction with high PEC water splitting performance.
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
JOURNAL OF RARE EARTHS
·
2017
·
IF 2.429
Yanran XUN,Xinxin HE,Han YAN,Ziwang GAO,Zhao JIN,Chunjiang JIA
In this paper, a series of Fe- and Co-doped lanthanum (hydr)oxides catalysts were prepared by a simple coprecipitation-hydrothermal method. The as-prepared catalysts were characterized with various techniques including powder X-ray diffraction (XRD), N 2 adsorption/desorption, inductively coupled plasma (ICP) and transmission electron microscopy (TEM). The Fe-based catalysts exhibited consecutive phase changes of amorphous FeO x →FeLaO 3 →Fe 2 N under different stages (as-prepared→calcination→ammonia decomposition reaction); as for Co-based catalysts, the phase transformation followed a sequence of Co(OH) 2 → Co 3 O 4 →metallic Co. It was revealed that Fe 2 N and metallic Co were most probably the active crystalline phase respectively for Fe- and Co-based catalysts in the decomposition of ammonia.
研究领域:
催化化学
·
材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）