JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Debin Cai,Shuai Wu,Zhen Tian,Li Guo,Yanzhong Wang
The self-assembled aerogels are considered as an efficient strategy to address the aggregation and restacking of Ti 3 C 2 T x MXene nanosheets for high-performance supercapacitors. However, the low mechanical strength of the MXene aerogel results in the structural collapse of the self-standing supercapacitor electrode materials. Herein, a low-cost melamine sponge (MS) absorbed different cations (H + , K + , Mg 2+ , Fe 2+ , Co 2+ , Ni 2+ and Al 3+ ), serves as a carrier and crosslinker for loading MXene hydrogel induced by the absorbed cations on the skeleton surface and the pores of MS, resulting in the high loading mass MXene aerogels with high mechanical strength. The experimental results show that the Mg-Ti 3 C 2 T x @MS aerogel exhibits the maximum area capacitance of 702.22 mF cm −2 at 3 mA cm −2 , and the area capacitance is still 603.12 mF cm −2 even at 100 mA cm −2 , indicating the high rate capability with a capacitance retention of 85.89 %. It is worth noting that the constructed asymmetric supercapacitor with activated carbon achieves high energy densities of 104.53 μWh cm −2 and 93.87 μWh cm −2 at 800 μW cm −2 and 7999 μW cm −2 , respectively. Furthermore, the asymmetric supercapacitor shows the high cycling stability with 90.2 % capacity retention after 10,000 cycles. This work provides a feasible strategy to prepare Ti 3 C 2 T x MXene aerogels with large layer spacing and high strength for high-performance supercapacitors.
研究领域:
材料科学
·
能源存储
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CRYSTAL GROWTH & DESIGN
·
2018
·
IF 3.972
Pengfang Zhang,Yun Xiao,Hui Sun,Xiaoping Dai,Xin Zhang,Haixia Su,Yuchen Qin,Daowei Gao,Axiang Jin,Hai Wang,Xiubing Wang,Shigang Sun
Morphology-controlled synthesis of metal–organic frameworks (MOFs) is of tremendous importance to understand the morphology–structure–property relationships. Although great emphasis has been placed on the controllable synthesis of MOFs, the preparation of hollow and nanoframe-like MOFs, especially using the microwave irradiation method, remains a great challenge. In the present work, we report microwave-assisted synthesis of hollow butterfly and ring zeolitic imidazolate framework-8 (ZIF-8) with the stimuli of Ni ions. Interestingly, the sphere, butterfly, and fiber ZIF-8 catalysts were also fabricated when adjusting the weight ratio of Zn and Ni resources. Specifically, sphere, butterfly, hollow butterfly, and ring particles have maintained the ZIF-8 structure. On the basis of the time sequential experiments, we inferred that the formation of hollow butterfly and ring particles is driven by the change of surface energy. The Knoevenagel reaction was carried out to explore the catalytic activity of these ZIF materials. The ring particles with ZIF-8 structure showed the highest catalytic activity. The open structure, thin walls, and the amount of basicity have been extensively discussed to shed light on the superior catalytic performance of ring particles.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
WATER RESEARCH
·
2023
·
IF 12.8
Sainan Sun,Meng Qiao,Guanghua Huang,Junke Zhang,Bo Yang,Xu Zhao
Phosphonate used as scale inhibitor is a non-negligible eutrophic contaminant in corresponding polluted waters. Besides, its conversion to orthophosphate (ortho-P) is a precondition for realizing bioavailable phosphorus recovery. Due to the feeble degradation efficiency with less than 30 % from classical Fenton commonly used in industrial wastewater treatment and itself vulnerable to strong inhibition interference of matrix chloride ions, we proposed an electrochemical approach to transform the native salt in the solution into oxidizing substances, sort of achieving beneficial utilization of matrix waste, and enhanced the ortho-P conversion rate of 1-Hydroxyethane-1,1-diphosphonic acid (HEDP) to 89.2 % (± 3.6 %). In electrochlorination system, it was found that HEDP rapidly complexed with Fe(II) and then coordinated in-situ Fe(III) to release free HEDP via intramolecular metal-ligand electron transfer reaction. The subsequent degradation mainly rooted in the oxidation of pivotal reactive species HClO, Fe IV O 2+ and 1 O 2 , causing C-P and C C bonds to fracture in sequence. Eventually the organically bound phosphorus of HEDP was recovered as ortho-P. This study acquainted the audiences with the rare mechanism of chloridion-triggered HEDP degradation under electrochemical way, as well as offered a feasible technology for synchronous transformation of organically bound phosphorus to ortho-P and elimination from phosphonates.
研究领域:
环境科学
·
废水处理
·
电化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Small
·
2024
·
IF 13
Hongmei Luo,Qifeng Mu,Ruijie Zhu,Min Li,Huanwei Shen,Honglang Lu,Longyu Hu,Jiajun Tian,Wei Cui,Rong Ran
Mineralized bio-tissues achieve exceptional mechanical properties through the assembly of rigid inorganic minerals and soft organic matrices, providing abundant inspiration for synthetic materials. Hydrogels, serving as an ideal candidate to mimic the organic matrix in bio-tissues, can be strengthened by the direct introduction of minerals. However, this enhancement often comes at the expense of toughness due to interfacial mismatch. This study reveals that extreme toughening of hydrogels can be realized through simultaneous in situ mineralization and salting-out, without the need for special chemical modification or additional reinforcements. The key to this strategy lies in harnessing the kosmotropic and precipitation behavior of specific anions as they penetrate a hydrogel system containing both anion-sensitive polymers and multivalent cations. The resulting mineralized hydrogels demonstrate significant improvements in fracture stress, fracture energy, and fatigue threshold due to a multiscale energy dissipation mechanism, with optimal values reaching 12 MPa, 49 kJ m −2 , and 2.98 kJ m −2 . This simple strategy also proves to be generalizable to other anions, resulting in tough hydrogels with osteoconductivity for promoting in vitro mineralization of human adipose-derived mesenchymal stem cells. This work introduces a universal route to toughen hydrogels without compromising other parameters, holding promise for biological applications demanding integrated mechanical properties.
研究领域:
生物材料学
·
组织工程学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2020
·
IF 3.871
Chengzhen Sun,Mei Liu,Shijing Xu,Shaohua Zhu,Jiazhong Wu,Bofeng Bai
We experimentally study the influence of inorganic salt ions on the wettability of originally oil-wet rock surfaces, formed by adsorbing polar molecules via polar interactions. It is found that the ions can alter the surface to a more water-wet state with a reduction in the water contact angle of about 20° at most. At lower concentrations, the effect of CaCl 2 solutions is more obvious than that of NaCl solutions, and Na 2 SO 4 solutions are more effective than NaCl solutions. Through a series of characterization, underlying mechanisms are revealed as: (1) the octadecylamine protonates at oil–water interface and attracts with the anions, reducing oil–water interfacial tension; (2) the cations are adsorbed on the negatively charged quartz surface, weakening the electronegativity of quartz surface and replacing the adsorbed octadecylamine molecules. Finally, a quantitative theoretical model is established based on the Young equation to predict the dependence of contact angle on the ion concentration.
研究领域:
石油工程
·
表面科学
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Sustainability
·
2022
·
IF 7.244
L. Fan,L. Cao,S. Xiong,Y. Wu,Z. Li,F. Gu
Low-cost, high abundance, environmentally friendly, and intrinsic safety endow the aqueous Zn ion batteries a bright prospect for large-scale energy storage. However, it is still challenging to find suitable cathode materials with excellent Zn 2+ ion storage performance due to sluggish Zn 2+ ions intercalation kinetics. Herein, we prepare the novel nanobelts as advanced cathode materials via a simple solution impregnation method. Firstly, the Ca 2+ ions promote the conversion of vanadium-based materials from nanoparticles to nanobelts, and also act as a pillar to stabilize the structure of the vanadium-based material. Furthermore, the amorphous structure of the electrode also can be tuned by subsequent appropriate calcination , aiming to enhance Zn-storage performances. Thus, the cathode materials exhibit the superior electrochemical performances with a high-capacity retention rate of 93.75% at 0.5 A/g after 100 cycles and a capacity retention rate of 91.3% after 3000 cycles at 5 A/g. In addition, the flexible quasi-solid-state Zn ion batteries with Ca 2+ ions pre-intercalated vanadium-based oxide as cathode is also investigated, and show stable electrochemical properties under bending states. With the cost-effective and green large-scale synthesis process, the outstanding electrochemical performance of cathode shed light on the rational design of novel cathodes for practical aqueous Zn ion batteries .
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Frontiers in Chemistry
·
2020
·
IF 3.693
Kong Chuncai,Zhao Xueqi,Li Yingju,Yang Sen,Chen Yong Mei,Yang Zhimao
Design and synthesis of environmentally friendly adsorbents with high adsorption capacities are urgently needed to control pollution of water resources. In this work, a calcium ion-induced approach was used to synthesize sodium alginate fibroid hydrogel (AFH). The as-prepared AFH has certain mechanical strength, and the mechanical strength is enhanced especially after the adsorption of heavy metal ions, which is very convenient for the recovery. AFH exhibited excellent adsorption performances for Cu2+, Cd2+, and Pb2+ ions and displayed very high saturated adsorption capacities (Qe) of 315.92 mg·g−1 (Cu2+), 232.35 mg·g−1 (Cd2+), and 465.22 mg·g−1 (Pb2+) with optimized pH values (3.0–4.0) and temperature (303 K). The study of isotherms and kinetics indicated that adsorption processes of heavy metal ions fitted well with the pseudo-second-order kinetics model and the Langmuir model. Pb2+ was found to have the strongest competitiveness among the three heavy metal ions. Thus, AFH has great application prospects in the field of heavy metal ions removing from wastewater.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Jingqiu Li,Yi Feng,Lvye Yang,Jianfeng Yao
Metal ion-induced etching can effectively convert zeolitic imidazolate frameworks (ZIFs) to CoNi-layered double hydroxides (LDH). Here, different metal-ion-assisted etching methods are utilized to convert Co-ZIF-L to CoNi-LDH with various morphologies and electrochemical properties . The resultant CoNi-LDH (CoNi-1) with a composition of Co 0.7 Ni 0.3 (OH) 2 displayed a high electrochemical performance when Co-ZIF-L was treated in N, N -dimethylformamide-ethanol solution containing Co 2+ ions followed by Ni 2+ ion-induced etching under hydrothermal condition. The improved electrochemical performance of CoNi-1 can be attributed to structural advantages, where the well-dispersed ultrathin CoNi-LDH layers favor the exposure of surface active sites and promote ion diffusion to maximize electrochemical properties.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF FOOD SCIENCES AND NUTRITION
·
2012
·
IF 1.151
Weijun Chen,Chunmei Zhang,Yulin Huang,Fangfang Cheng,Yan Shen,Rencai Wang,Minmin Tang,Yajun Zheng,Songlin Zhao
The oxidative modification of human low density lipoprotein (LDL) plays a significant role in atherosclerosis. In this study, the inhibiting activity of areca inflorescence extracts (AIEs) on LDL oxidation was investigated by an in vitro study with Trolox as the standard antioxidant. The kinetics of LDL oxidation, thiobarbituric acid reactive substances assay, ferric-reducing antioxidant power assay and copper chelation assay were also evaluated to assess the antioxidant activities of AIEs, and the results revealed that AIEs could delay the lag time and inhibit the formation of malondialdehyde in the process of LDL peroxidation induced by Cu2+. The boiled water extract displayed the highest antioxidant activity compared with the ambient water extract and ethanol extract. The total phenolic contents and phenolic components of AIEs were also measured by high performance liquid chromatography method. Epicatechin, gallic acid and coumalic acid were the primary phenolic acids in AIEs.
研究领域:
医学
·
生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2020
·
IF 3.807
Jingchao Chen,Ximing Huang,Xiaotong Fang,Chunxia Yan,Zhiming Gao,Huibo Shao
Intermolecular hydrogen bond , a kind of basic van der Waals bonds , commonly exists in biological systems. As a fundamental step in biological metabolism, the disassembly process of hydrogen bond is necessary to be given more attention. Here, we have demonstrated the disassembly of intermolecular hydrogen bond by scanning electrochemical microscopy . The intermolecular hydrogen bond was designed between the hydroxyl of ferrocenemethanol (FcCH 2 OH) and the carboxyl group of 3-mercaptopropionic acid (3-MPA), and FcCH 2 OH was bonded on 3-MPA self-assembled monolayer modified electrode surface . Cation (Mg 2+ , Ca 2+ or Ba 2+ ), as an external stimulus, induced the disassembly of hydrogen bond by forming ion-pair with terminal carboxylate anion. Furthermore, the inducing capability of cation was Mg 2+ < Ca 2+ < Ba 2+ in order based on the strength of ion-pairs between cation and carboxylate anion. The degree of disassembly was effectively regulated by the different ratio of additional mixed cations. According to the positive induction of cation on disassembly of intermolecular hydrogen bond, a practicable and effective approach was provided for field application of molecular recombination and medical bioengineering .
研究领域:
生物化学
·
电化学
·
医学工程
✓ 已验证
DOI
高影响因子
Polymers
·
2023
·Vol. 15
·期 24
·4735
·
IF 5
Xiaofang Fu,Zhuohui Zhang,Zhenhu Cao,Alexandr Alexandrovich Rogachev,Maxim Anatolievich Yarmolenko,Tao Chen,Hongtao Cao,Hongliang Zhang
The metallo-supramolecular polymer (MSP) is considered one of the most promising electrodes for electrochromic devices due to its intrinsically stable redox properties. Nevertheless, despite extensive work focusing on improving the electrochromic and electrochemical properties of MSPs, little experimental evidence exists from in-depth investigations on the anion-induced electrochromism of MSPs. Herein, Ru-based metallo-supramolecular polymer (polyRu) films with excellent electrochromic performance were fabricated through a novel electrochemical deposition method, and the electrochromic mechanism was further understood. The polyRu films possess fast reaction kinetics with a short switching time of 4.0 s (colored) and 2.8 s (bleached) and highly reversible redox properties due to the resulting impacts on the capacitive behaviors (containing surface, near-surface and intercalation pseudo-capacitance) of the perchlorate ions in the electrochromic process. Moreover, the electrochromic degradation of the polyRu films is considered to stem from the numerous nanopores in the film induced by ClO4−transport and the exchange of counter anions from Cl−to ClO4−. In addition, a physical model, revealing the transport of conduction ions and the evolution of the structure and properties of the polyRu film during the electrochromic process, is presented. It is observed that the charge balance of Ru3+and Ru2+, achieved through the adsorption/desorption of ClO4−on the film, provides electrochromic and electrochemical reversibility to the polyRu film under positive/negative bias. Correspondingly, a transformation from polyRu·(Cl−)2nto polyRu·(ClO4−)x(Cl−)2n−xin the polyRu film is induced by a counter anion exchange from Cl−to ClO4−. Revealing the detailed perchlorate ion transfer kinetics and electrochromic mechanism in this film can offer new insights into the application of metallo-supramolecular polymers in electrochromic devices.
研究领域:
材料科学
·
电化学
·
超分子化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 53
·期 15
·10732-10742
·
IF 2.993
Dong Yue,Lei Hong,Liu Wenqing,Wang Tianxian,Xu Lei
Chemical–mechanical polishing is the only technology that can provide a global planarization, and has become widely accepted. Abrasives are one of the important factors influencing chemical–mechanical polishing. In order to improve surface planarization and increase material removal rate of sapphire substrates, non-spherical silica composite abrasives were synthesized by lanthanum ion-induced effect-assisted growth method. Scanning electron microscopy showed the morphologies of non-spherical silica composite abrasives were peanut-shaped, chemical–mechanical polishing tests displayed the material removal rate of the non-spherical silica composite abrasives increased by 32.6% compared with spherical silica composite abrasives, Ambios Xi-100 surface profiler indicated the best surface roughness of sapphire substrate was 1.540 nm, and the element compositions of solids after polishing were analyzed by X-ray photoelectron spectroscopy, which investigated the interactions between abrasives and sapphire substrates. Non-spherical silica composite abrasives may lead to more solid-chemical reactions with sapphire substrates, and higher material removal rate may be also attributed to the mechanical grinding effect enhanced owing to the unique shape to achieve the purpose of material removal.
研究领域:
材料科学
·
表面工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）