ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Yanfei Xin,Xin Dai,Guangjun Lv,Xuedong Wei,Sai Li,Zhiqiang Li,Tong Xue,Ming Shi,Kunyang Zou,Yuanzhen Chen,Yongning Liu
α-Ni(OH)2 is an ideal candidate material for a supercapacitor except for its low conductivity and poor stability. In this work, BO2–-intercalated α-NixCo(1–x)(OH)2 is synthesized by a hydrothermal method at a low cost. The Co dopant can decrease the charge-transfer resistance and enhance the cyclic stability. The special unsaturated electronic state of BO2– enhances the bonding with metal ions and attracts water molecules. Thus, the BO2– ions support the hydroxide layers as pillars and create efficient paths for proton transportation, optimizing the utilization of α-Ni(OH)2. The three-dimensional (3D) flowerlike morphology supplies an enormous number of active sites, and r-GO is added to improve the conductivity. As a result, the modified α-Ni(OH)2 exhibits the specific capacitance of 2179, 1592, and 1423 F·g–1 at 1, 20, and 40 A·g–1, respectively, showing improved rate performance. Matching with the commercial activated carbon (AC) as an anode, the asymmetric capacitor delivers an energy density of 40.66 W·h·kg–1 when its power density is 187.06 W·kg–1. Meanwhile, it retains 81.5% capacitance of the initial cycle at 5 A·g–1 after 3000 cycles. With conductivity enhanced and structure stabilized, the modified α-Ni(OH)2 confronts broader fields of application.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
PubMed
高影响因子
CRYSTAL GROWTH & DESIGN
·
2024
·
IF 3.2
Xuyi Li,Chen Huang,Rui Xue,Jia-Ping Tong,Yuehan Cheng,Bao-Li An,Jiaqiang Xu,Yue-Ling Bai
Viologen has attracted much attention due to its sensitive chromic properties in response to external stimuli, especially its photochromic behavior. Herein, a viologen derivative, 4PV·2Br, was prepared based on our previous studies, which exhibited strong photoluminescence due to the introduction of the thiazolothiazole group but was silent to light, even under 300 W UV light irradiation. By anion exchange with tetraphenylborate, a new viologen derivative, 4PV·2B(Ph)4, was obtained, which not only exhibits strong fluorescence with a quantum yield of 69% and a lifetime of 1.93 ns in solution but also exhibits sensitive photochromism to UV light, even under sunlight within 5 s. It is very sensitive to light and may become a potential excellent solar chromic material. It should be emphasized that the colored 4PV·2B(Ph)4 radical is particularly stable and can maintain its coloring state in air for a long time, while vinegar vapor can cause it to fade in 2 s, giving it good color reversibility. The single-crystal structure before and after UV light excitation shows that UV light shortens the π···π distances between B(Ph)4 anions and 4PV cations, which is beneficial to faster electron transfer between them and the formation of stable viologen radicals. Sensitive photochromism accompanied by strong photoluminescence may endow 4PV·2B(Ph)4 with potential application in information security and provide a good strategy to regulate the functionality of materials by regulating the counteranions of new viologen derivatives.
研究领域:
材料化学
·
光化学
✓ 已验证
产品关联
DOI
高影响因子
Chem
·
2022
·
IF 25.832
Tao Liu,Yuxin Chen,Yaming Hao,Jianxiang Wu,Ran Wang,Limin Gu,Xuejing Yang,Qiang Yang,Cheng Lian,Honglai Liu,Ming Gong
The ion-enriched electrode-electrolyte interface is a unique characteristic of electrocatalytic reactions that can effectively tune the local chemical environment. In this study, we discovered a strong synergy between borate and fluoride anions for water oxidation in neutral conditions. Under an optimal ratio of the two anions, the water oxidation current significantly outperforms the individual counterparts by almost an order of magnitude. This synergy was greatly attributed to the hierarchical anions at the interface, with borate approaching the surface and fluoride extending out, as revealed by in situ surface-enhanced Raman spectroscopy and molecular dynamics simulation. This hierarchical anion arrangement created two kinetics regions, with one borate-dominating region to lower the onset potential and one fluoride-dominating region to sustain a larger current. Using the synergized electrolyte, a low-cost and facilely synthesized Co(OH) 2 electrode could achieve an outstanding performance of 100 mA/cm 2 at 1.791 V versus RHE under pH = 7.87 with a 2-week-long durability.
研究领域:
电化学
·
材料科学
·
催化反应
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2019
·
IF 4.561
Yang Yu,Zeyu Yang,Shujing Ren,Yanan Gao,Liqiang Zheng
Biocompatible antibacterial hydrogels as novel dressing materials have been a widely researched method in modern medical technology. Here, we designed and prepared a new type of multifunctional antibacterial hydrogels that used poly(vinyl alcohol) (PVA)-tetrahydroxyborate anion (B(OH) 4 − ) hydrogel as a vector and pyrrolidinium ionic liquids (ILs) as antibacterial drugs . The formation of borate ester bonds between PVA and B(OH) 4 − as dynamic network junctions endows hydrogels with multiple functions. Moreover, the as-prepared hydrogel exhibited effective anti-microbial activity against Escherichia coli and Staphylococcus aureus . Our results indicated that the hydrogels containing ILs with longer alkyl chain exhibited more pronounced antibacterial properties. The moisture retention, self-healing, syringeability and multiresponse behavior together with the antibacterial properties of the hydrogels make them ideal candidates as multifunctional dressing materials for joint skin wound healing.
研究领域:
生物材料学
·
医学工程
·
药剂学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2022
·
IF 24.319
Hanxiao Liao,Ganghai Ni,Pengfei Tan,Yong Liu,Kejun Chen,Gongming Wang,Min Liu,Jun Pan
Nickel-iron layer double hydroxide (NiFe LDH) is deemed as an attractive pre-catalyst to lower the reaction barrier of oxygen evolution reaction (OER). However, the catalytic efficiency of NiFe LDH is always hampered by the slow and incomplete reconstruction during OER process. Herein, a strategy of borate ion (BO 3 3- ) regulation is developed to achieve a fast and adequate reconstruction of NiFe LDH. The BO 3 3- is easy to fill the oxygen vacancy in NiFe LDH, which can narrow the band gap of NiFe LDH to realize an efficient reconstruction under OER conditions. DFT calculations demonstrate the enhanced effect of BO 3 3 - on adsorption of hydroxyl ion (OH - ) to further improve the OER activity. Sequentially, the BO 3 3- decorated NiFe LDH (NiFeB) shows a desirable catalytic activity for OER with an ultralow overpotential of 201 mV to reach a current density of 10 mA cm −2 , which is 40 mV lower than the overpotential of pure NiFe LDH. Moreover, membrane electrode assembly cell using anodic NiFeB and cathodic Pt/C for water splitting affords a cell voltage of only 2.0 V to drive a current density of 540 mA cm −2 . This work widens the horizon of ion effect on electrocatalysis and offers an effective approach for developing high-active electrocatalysts.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Zhengshan Yang,Huayi Yin,Bowen Deng,Dihua Wang
Molten carbonate electrolysis cells (MCEC) are a promising electrochemical CO 2 capture and conversion process. However, the CO 2 absorption and energy efficiencies are limited by the sluggish CO 2 absorption kinetics and high electrode overpotentials. Herein, we propose an electrolyte engineering strategy to improve the CO 2 absorption rate and reduce overpotentials at both the anode and the cathode. When BO 3 3− was added into molten Li 2 CO 3 -Na 2 CO 3 -K 2 CO 3 , the CO 2 adsorption efficiency was improved from 3.3% to 60%, the overpotential was reduced by ∼ 567 mV at the cathode and by ∼ 238 mV at the anode under 200 mA cm −2 . Accordingly, the energy efficiency reached 76.2 % at 650 °C. The improved CO 2 absorption and energy efficiencies are thanks to the BO 3 3− that changes the thermodynamic properties of the molten carbonate, i.e., the BO 3 3− –CO 3 2− complex reduces the energy barrier for the reduction of CO 3 2− at the cathode and for the liberation of O 2− that can be oxidized at a lower potential than CO 3 2− at the anode. Therefore, the electrolyte engineering is an effective strategy for designing high-temperature CO 2 electrolyzers with high CO 2 absorption and energy efficiency.
研究领域:
化学工程
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMISTRY LETTERS
·
2021
·Vol. 50
·期 5
·996-998
·
IF 1.389
Wang Yunju,Huang Yuhao,Wang Hongyu
Electrolyte solutions of lithium tetrafluoroborate dissolved in sulfolane are applied in dual-ion batteries. A graphite positive electrode in this kind of solutions delivers a reversible anion storage capacity over 80 mAh g−1 at potentials over 4.5 V vs. Li/Li+. The structures of anion-graphite intercalation compounds are investigated in detail by the combination of in situ X-ray diffraction (XRD) and in situ Raman spectroscopic measurements.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Polymers
·
2025
·Vol. 17
·期 10
·1368
·
IF 4.9
Hui Jiang,Xinchi Zong,Zhengwei Luo,Wenhua Geng,Jianliang Zhu
This study presents a novel ion-imprinted fiber material, I-(PP-g-GMA-NMDG), designed for the rapid and selective adsorption of borate ions. Leveraging low-temperature plasma graft polymerization, polypropylene (PP) melt-blown fibers were functionalized with glycidyl methacrylate (GMA) and N -methyl- D -glucamine (NMDG) to introduce tailored recognition sites. Systematic optimization of plasma parameters (100 W discharge power, O 2 atmosphere) and liquid-phase grafting conditions (28.5% GMA, 85 °C, 2.5 h) achieved a grafting rate of 203.26%. The imprinted fibers exhibited exceptional adsorption performance, with a maximum capacity of 35.85 mg/g at pH 9, reaching 90% saturation within 60 min. Adsorption kinetics adhered to a pseudo-second-order model, while the Freundlich isotherm indicated multilayer adsorption. Competitive ion experiments demonstrated high selectivity for B(OH) 4 − over anions (SO 4 2− and Cl − ) and cations (Na + , K + , Ca 2+ , and Mg 2+ ), which was attributed to the precise spatial and charge complementarity of the imprinted cavities. Characterization via FT-IR, XRD, and SEM confirmed successful synthesis and structural stability. The material retained 78.1% adsorption efficiency after five regeneration cycles, showcasing its practicality for boron recovery from wastewater. This work advances boron-selective adsorption technology by combining plasma modification with ion imprinting, offering a sustainable solution for industrial and environmental applications.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Energy Materials
·
2020
·
IF 4.473
Shufang Zhao,Yuhao Huang,Yunju Wang,Dandan Zhu,Lei Zhang,Hongyu Wang
In a dual-ion battery with an electrolyte solution, the anion storage behavior of graphite positive electrode is heavily dependent on anion solvation. In 1 M LiBF4 solutions dissolved in cyclic carbonates including ethylene carbonate, propylene carbonate, butylene carbonate, and their mixtures, the performance of graphite positive electrode is investigated by traditional electrochemical tests in conjunction with ex situ and in situ X-ray diffraction (XRD) characterizations. The intimate correlation between the storage capacity of tetrafluoroborate anion in the graphite electrode and electrolyte solution’s composition has been found. Graphite intercalation compounds based on various types of solvated tetrafluoroborate anion have been identified. From the solutions based on carbonate mixtures, the co-intercalation of different carbonate species together with the anion has been discovered. The preferential affinity between the anion and ethylene carbonate is disclosed.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2020
·Vol. 10
·期 55
·33444-33449
·
IF 3.119
Jun Liu,Xue Zhao,Haibo Zhang
Today, metal-based nanomaterials play an increasingly important role in the energy, environment, medical and health fields. In order to meet the needs of various fields, it is necessary to continuously develop advanced technologies for preparing metal-based materials. Inspired by previous research, the results of a proof-of-concept experiment show that the hexahydro-closo-hexaborate anion (closo-[B6H7]−) in the borane cluster family has properties similar to NaBH4. Closo-[B6H7]− can not only convert common precious metal ions such as Au3+, Pd2+, Pt4+ and Ag+ to the corresponding zero-valence state, but also convert some non-precious metals such as Cu2+ and Ni2+ to the zero-valent or oxidation state. Closo-[B6H7]− moderate reduction to cause rapid aggregation of metal-based materials is not easy compared with NaBH4. Compared with closo-[B12H12]2−, closo-[B6H7]− achieves the conversion of Pt4+ to Pt0 under ambient conditions, and its reduction performance extends to non-precious metals. The excellent stability and easy modification characteristics determine the universality of the closo-[B6H7]− reduction strategy for metal ions.
研究领域:
材料科学
·
化学
·
能源与环境科学
✓ 已验证
DOI
PubMed
高影响因子
ACS Applied Energy Materials
·
2022
·
IF 6.959
Yunju Wang,Hongyu Wang
Solvents have an effect on anions’ intercalation into graphite and therefore partly determine the electrochemical performance of dual-ion batteries. Lithium tetrafluoroborate (LiBF4) together with a mixture of ethyl methyl sulfone and sulfolane is employed as electrolyte solutions and graphite electrodes charged to 5.5 V deliver a reversible capacity as high as 90 mA h g–1. In situ X-ray diffraction measurements are performed for graphite electrodes in Li/graphite cells to investigate the formation process of anion–graphite intercalation compounds (AGICs). Intercalation gallery heights are found to change discontinuously from 0.8 to 1.07 nm with potentials in certain solutions, which means that the species inside graphite sheets are altered. Besides, variable factors of the AGICs’ evolution process such as potentials, LiBF4 concentration, and past experience of electrochemical intercalation have been discussed.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
LANGMUIR
·
2024
·
IF 3.7
Yunju Wang,Xintong Zhang,Yichun Liu,Shunchao Ma,Li Qi,Hongyu Wang
Intercalation of anions unlocks graphite as a positive material in energy storage devices, and the performance could be affected by solvents in solutions. In this context, it is vital to investigate the role of solvents in anion intercalation. Herein, a hierarchical intercalation phenomenon, in which different graphite intercalation compounds are generated in the same solution, is studied in lithium tetrafluoroborate (LiBF4) solutions of carboxylate ester solvents γ-butyrolactone (GBL) and methyl acetate (MA). The evolution modes of the graphite cathode structure during electrochemical intercalation and deintercalation are discussed via in situ X-ray diffraction (XRD) measurements. Based on this, the relationship between GICs and potentials, together with concentrations, is compared in detail. Furthermore, various graphite materials with different surface properties are applied to adjust the anions’ solvation status inside graphite sheets.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）