JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Zhijie Cui,Zhibo Yan,Jie Yin,Wenpin Wang,Mei-E Yue,Zhongcheng Li
Tailoring surface composition and coordinative environment of catalysts in a nano-meter region often influence their chemical performance. It is reported that CoP exhibits a low dissociation ability of H–OH, originating from the poor desorption of intermediate species. Herein, we provide a feasible method to construct P-Fe 2 O 3 -CoP nanosheets through a gas-phase phosphorization process. P doping induces the formation of interfacial structure between Fe 2 O 3 and CoP and the generation of defective structures. The resulting P-Fe 2 O 3 -CoP nanosheets afford high freshwater/seawater oxidation activity (250/270 mV@10 mA/cm 2 ) in 1 mol/L (M) KOH, which is even lower than commercial RuO 2 . Compared with CoP||CoP, P-Fe 2 O 3 ||P-Fe 2 O 3 , and Co 3 O 4 ||Co 3 O 4 , the assembled P-Fe 2 O 3 -CoP||P-Fe 2 O 3 -CoP exhibits the superior water/seawater electrolysis performance with 1.61/1.65 V@10 mA/cm 2 . The synergistic effect of P doping, defective structure, and heterojunction leads to high water oxidation efficiency and water splitting efficiency.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Shuya Gao,Qian Wang,Ying Lin,Haibo Yang,Lei Wang
Herein, we developed a three-dimensional composite of reduced graphene oxide (rGO) sheets assembled with flower-like, porous Bi 0.9 La 0.1 FeO 3 microspheres , using a facile chemical etching process. Their electromagnetic wave absorption properties were investigated. The maximal reflection loss of the composite with the rGO amount of 30 mg reaches −69.97 dB at a thin thickness of 1.91 mm with an effective bandwidth of 5.2 GHz. The composite with 45 mg rGO also exhibits a maximal reflection loss of −58.19 dB at a thinner thickness of only 1.58 mm. The above excellent performances are due to the enhanced conductivity and surface area by the introduction of rGO and the particular microstructure containing abundant surface defects and micro-interfaces, which make it superior to other rGO-based composites reported previously and to be a promising candidate for electromagnetic wave absorber.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
Heliyon
·
2024
·
IF 3.4
Bingxuan Du,Haichao Li,Conglin Zhang,Qingsong Ji
Nanocarbons have potential applications in almost all areas of materials science. While we have appreciated the various discoveries and applications of many nanocarbons, we recognize that the field remains challenging in terms of tunability. In this research, we report a new strategy for the self-assembly of surfactant @ salt from the concept of carbon nanostructure design, and introduce the concept of “separator”. On the one hand, it allows the core and shell to be formed in one step. On the other hand, it allows the ordered aggregates to remain in their original shape under thermal action. The surface morphology, degree of graphitization, elemental composition and surface chemical state, formation mechanism, and specific luminescent properties of carbon nanomaterials were investigated. TEM reveals that (dodecyldimethyl betaine) BS-12 @ LiCl carbon nanospheres with tunable size (from 55 nm to 70 nm) can be successfully synthesized. Raman and XRD show that the structure of carbon nanospheres has some defects and disordered carbon. XPS and FTIR analyses indicate that the defects present in the carbon nanosphere structure are related to the N and O elements. The detailed growth mechanism shows that the micelle structure in the system can be well adjusted by changing the concentration of surfactant. PL research demonstrates that the synthesized carbon nanospheres have UV luminescent properties. Most importantly, the method can be further developed into a general strategy for self-assembly using a variety of surfactants and “separators” as promising candidates for future practical applications of nanocarbon materials.
研究领域:
材料科学
·
纳米技术
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Min Mo,Xingjia Bai,Zhonglin Liu,Zhimin Huang,Mengxue Xu,Lanyu Ma,Wenqin Lai,Qiufeng Mo,Songbo Xie,Yanming Li,Yifeng Huang,Ning Xiao,Yihua Zheng
Hypothesis: In the interfacial wetting boundary, the superhydrophobic surface is often damaged, and the anisotropic wettability of its surface has attracted many researchers’ attention. The “petal effect” surface has typical anisotropic wettability . We predict that under the dual conditions of structural defects and high impact velocity , the “petal effect” becomes more adhesive on the surface. Experiments: This study refers to the droplet state on rose petals, structural defects were constructed on the superhydrophobic surface. This paper studies the influence of macro-structural defects on the wettability change from natural to bionic “lotus effect” to “petal effect” in both static and dynamic angles. Findings: Macro defects significantly change the static contact angle of the superhydrophobic surface. The higher the impact velocity of the droplet, the higher the energy dissipation of the “petal effect” surface (DSHS), which improves the adhesion of the surface to the droplet and prolongs the contact time. It is found that the defect structure and high impact velocity will directly affect the deposition and desorption of droplets on the superhydrophobic surface, and they are both essential. This wetting dynamic law is very likely to be helpful in the quantitative design of defect structure scale for dynamic desorption of droplets on superhydrophobic surfaces.
研究领域:
材料科学
·
表面工程学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2024
·Vol. 12
·期 25
·9284-9292
·
IF 5.7
Chengxue Du,Dangli Gao,Xiaochun Hou,Xiangyu Zhang,Qing Pang,Sining Yun
The development of luminescent materials for optical information encryption has received great attention in recent years. However, single-mode luminescent materials greatly limit their information capacity and encryption level. Here, a broad range of gadolinium gallate-based oxide persistent material systems with tuneable persistent luminescence (PersL) are rationally designed by the construction of electron–hole defect pair structures between Bi3+ and a set of lanthanide ions (Ln3+) (Ln = Eu, Sm, Tb, Dy, Pr and Ce). These phosphors exhibited excellent quadruple-mode luminescence including photoluminescence (PL), PersL, thermoluminescence (TL) and photo-stimulated luminescence (PSL). In particular, a quadruple-mode ‘morning glory’ encrypted pattern using these multimode persistent phosphors as storage media demonstrates multilevel optical information storage accompanied with dynamical encryption. These findings described here provide a universal methodology to construct a novel class of persistent materials with tuneable PersL emission and high information storage capacity.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2024
·
IF 20.2
Ruolin Cheng,Jing Ren,Haoran Wang,Huagen Liang,Panagiotis Tsiakaras
Utilizing sunlight to achieve CO 2 conversion and environmental remediation has been a key focus. Herein, “all-in-one” graphitic carbon nitride (g-C 3 N 4 ) composite-based photocatalysts were synthesized by a simple one-step low-temperature calcination . Lower calcination temperature resulted in defective g-C 3 N 4 enriched in cyano and hydroxyl groups . It was found that by incorporating amorphous FeO X , the resulted FeO X /O-g-C 3 N 4 photocatalyst shows very good performance towards both CO 2 cycloaddition reaction and photo-Fenton degradation of tetracycline (TC). It was also found that the photocatalyst shows the highest styrene carbonate yield of 83% (23 mmol g −1 h −1 ) under ambient conditions, which is 13.8 times higher than that obtained over pure g-C 3 N 4 . The photocatalyst also exhibits a 4.7 times faster TC removal rate than that of pure g-C 3 N 4 . Systematic characterization and mechanism study demonstrate the role of defects and photo-induced charge carriers.
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
ENERGY & FUELS
·
2024
·
IF 5.2
Lan Li,Tingxue Fang,Fuming Lai,Xinyue Li,Tingting Qu,Lin Wang,Xiaoshi Lang,Kedi Cai
Vanadium pentoxide (V2O5) is regarded as a promising sulfur-wrapped matrix for high-performance lithium–sulfur batteries, owing to its desirable structural and functional characteristics. In this paper, a large number of defective sites arise in the vanadium pentoxide structure via a codecoration strategy of the V, O sites, which is more beneficial to improving the electroconductivity and allows for the uniform loading of sulfur on the surface, thereby reducing the polarization resistance and elevating the kinetic rates during the electrochemical reaction. Electrochemical test results indicate that Mg2+/S-codecorated V2O5/S composite cathodes have 1131.15, 942.39, and 804.71 mAh·g–1 of discharge-specific capacities at 0.1, 0.2, and 0.5 C rates, respectively, with the lowest charge/discharge plateau voltage difference, and the capacity retention rate after 140 cycles can be 57.95%. Besides that, the multidefect V2O5 can effectively promote the adsorption strength of lithium polysulfide and catalytically accelerate the rate of liquid-phase conversion between lithium polysulfide so as to achieve the stable electrochemical properties for sulfur composite cathodes.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Zhengyu Wei,Pingyi Feng,Lingzhe Meng,Xuelin Gong,Faheem Naseem,Xue Qin,Wei Wei
Carbon-based transition-metal electrocatalysts are regarded as promising candidates for catalyzing oxygen reduction reaction (ORR), yet their electrocatalytic ORR performances are greatly limited by active sites utilization caused by the metal aggregation and pore collapse under high temperature. This study rationally designed a cobalt-based ORR catalyst supported on a g-C 3 N 4 /carbon nanotube (CNT) network as a cost-effective alternative of platinum-based catalysts. CNT were embedded into the lamellar precursor of melamine and cyanuric acid, and a synergistic effect between CNT and precursor was realized to regulate the density and activity of active sites. The polycondensation of precursors led to the formation of an "interlocking" structure of CNT supports with abundant exposed defects, allowing for effectively anchoring cobalt ions to generate Co-N x sites. Meanwhile, partial Co ions underwent reconstruction and transportation to form Co nanoparticles and extended the disruptive CNT structure, exposing more interfacial defects to enhance the ORR catalytic properties. The prepared Co@g-C 3 N 4 /CNT catalyst demonstrated impressive ORR activity comparable to commercial Pt/C catalyst, showing superior stability. This research offers a promising approach for engineering interfacial defects to synthesize high-performance non-precious metal electrocatalysts for energy conversion applications.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Chemistry
·
2020
·
IF 7.216
Shan-Shan Fan,Ling Shen,Yuan Dong,Ge Tian,Si-Ming Wu,Gang-Gang Chang,Christoph Janiak,Ping Wei,Jin-Song Wu,Xiao-Yu Yang
Three-dimensional (3D) hybrid of nanocarbons is a very promising way to the high-performance design of electrocatalysis materials. However, sp 3 -like defect structure, a combination of high strength and conduction of graphene and carbon nanotubes (CNTs) is rarely reported. Herein, 3D neural-like hybrids of graphene (from reduced graphene oxide) and carbon nanotubes (CNTs) have been integrated via sp 3 -like defect structure by a hydrothermal approach. The sp 3 -like defect structure endows 3D nanocarbon hybrids with an enhanced carrier transfer, high structural stability, and electrocatalytic durability. The neural-like structure is shown to demonstrate a cascade effect of charges and significant performances regarding bio-electrocatalysis and lithium-sulfur energy storage. The concept and mechanism of “ sp 3 -like defect structure” are proposed at an atomic/nanoscale to clarify the generation of rational structure as well as the cascade electron transfer.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2016
·Vol. 5
·期 3
·1035-1042
·
IF 8.262
Ming Liu,Zhaojie Wang,Junxue Liu,Guijuan Wei,Jiao Du,Yanpeng Li,Changhua An,Jun Zhang
The synthesis of layered transition metal dichalcogenide nanocrystals with excellent properties in energy conversion and storage has been well documented in the past several years. However, due to the metallic character of Te, the realization of the chemical synthesis of uniform well-defined MoTe2 nanostructures still remains a challenge, especially to achieve metastable 1T′-MoTe2. In this work, we have developed a colloidal chemical strategy for the synthesis of ultrathin 1T′-MoTe2 nanosheets. The as-achieved sample was characterized by a layered-expanded feature with an interlayer distance of 0.723 nm and rich defects. The shapes of 1T′-MoTe2 can be controlled by varying Mo precursors and the reaction atmosphere, where CO plays an essential role in determining the nanosheet feature. Interestingly, the optimized few-layer 1T′-MoTe2 nanosheets can be used as an efficient supercapacitor electrode with specific capacitances of 1393 F g−1 and 714 F g−1 at current densities of 1 A g−1 and 100 A g−1, respectively. An asymmetric 1T′-MoTe2//activated carbon supercapacitor exhibits a maximum specific capacitance of 158.9 F g−1 with an energy density up to 56.4 W h kg−1. To the best of our knowledge, it is the first time that ultrathin MoTe2 nanosheets have been used as ideal electrode materials for supercapacitors. The present work highlights a facile synthetic strategy to realize uniform transition metal telluride nanostructures for enhancing their electrochemical performances.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Molecular Catalysis
·
2022
·
IF 5.089
Feng Li,Haiyang Zhang,Miaomiao Zhang,Wencai Peng,Lisha Yao,Yanzhao Dong,Jinli Zhang
The benchmark carbon-based catalyst, activated carbon (AC), has a low catalytic activity due to its uniform surface charge distribution and stable structure. To overcome these problems, melamine-phenol-formaldehyde (MPF) resin, which is rich in pyridinic N and pyrrolic N, multi-porous C-N materials rich with defect sites were synthesized in situ by heat treatment using silica sol as the template and phenol, melamine, and formaldehyde as the carbon and nitrogen sources. The experimental results and characterization techniques revealed that carbon materials with abundant hierarchical pores and local C-N active sites were constructed by incorporating heteroatom-containing groups. Hydrogen chloride and acetylene molecules were activated due to the high electronegativity of defective sites, and the synergistic interactions between pyridinic N and π-containing functional groups (C=C, triazine ring, etc.). The structure-performance relationship was also clarified using DFT calculations. In addition, the strong interactions between heteroatomic sites and metal species also made MPF-800 an admirable metal catalyst support. Overall, the disadvantages of acetylene hydrochlorination catalyzed by benchmark AC were resolved.
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2021
·
IF 5.302
Hongye Wang,Rui Huang,Cheng Tao,Hua Hao,Zhonghua Yao,Hanxing Liu,Minghe Cao
Dielectric capacitor with high energy storage density has become a pivotally enabling technology in electronic industry. The most critical factors affecting energy storage capacity are polarization and breakdown strength . Here the BaTiO 3 @ NiO double-hysteresis-loop ceramics with different polarization characteristics are prepared by changing the sintering atmosphere to control the defect structure . Results show that, the samples sintered in oxygen exhibit the obviously characteristics of double hysteresis loop, higher polarization and larger breakdown strength . In contrast, the samples sintered in nitrogen have lower polarization and breakdown strength and weaker double hysteresis loop. It is proved that the double hysteresis loop is caused by the defects of the inner layer and the outer layer by regulating the defect structure . Firstly, Low valence Ni ions replace Ti ions to form N i Ti '' − V o • • defect dipoles. These charged defect dipoles could be pinned the domain wall, and the existence of oxygen vacancies restricts the movement of the domain wall, making the material appeared a pinched hysteresis loop similar to the double hysteresis loop as observed in antiferroelectrics. Secondly, the local electric field generated by the depletion layer at the interface may also trigger a new polarization features in the material. This double hysteresis loop helps to improve the polarization and energy storage capacity of the material.Finally, the excellent energy storage density of the oxygen samples reaches up to 2.48 J cm −3 at 340 kV cm -1 with prominent cycle stability and temperature stability. This work provides a prospective method to fabricate material with high energy storage performance by the adjustment defect structure to control the polarization mechanism in the BaTiO 3 @1NiO ceramics.
研究领域:
材料科学
·
电子工程
✓ 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）