Journal of Dental Sciences
·
2022
·
IF 3.719
Yixiang Pan,Jiajia Xu,Xue Cai,Xiaodong Li,Xiaoyan Wang
Background /purpose : The quality of the hybrid layer is of great importance for dentin bonding. The purpose of this study was to develop a novel copper-based pretreatment and investigate the effect of the pretreatment combined with universal adhesives on the dentin bond strength. Materials and methods Etch-and-rinse adhesive Single Bond 2 (SB2) and two universal adhesives Prime Bond Universal (PBU) and Single Bond Universal (SBU) were selected. The dentin surfaces were pretreated with CuSO 4 solution and K 2 HPO 4 solution in turn (Cu–P pretreatment), and the adhesive was applied following the manufacturer's instructions. There were four groups of Cu–P pretreatment: HH-Cu (1.5 mol/L CuSO 4 + 1.0 mol/L K 2 HPO 4 ); H–Cu (0.15 mol/L CuSO 4 + 0.1 mol/L K 2 HPO 4 ); L-Cu (0.015 mol/L CuSO 4 + 0.01 mol/L K 2 HPO 4 ); and LL-Cu (0.0015 mol/L CuSO 4 + 0.001 mol/L K 2 HPO 4 ). The microtensile bond strength (μ-TBS) and fracture mode were determined. The dentin surface after pretreatment and the antimicrobial properties of the pretreatment agent were also evaluated. Results The minimum inhibitory concentration and minimum bactericidal concentration of Cu–P pretreatment were 0.012 mol/L CuSO 4 + 0.008 mol/L K 2 HPO 4 . Combined with SB2, the H–Cu and L-Cu groups showed a higher μ-TBS ( P < 0.01), while the HH-Cu group showed a lower μ-TBS ( P < 0.001), and the LL-Cu group showed a similar μ-TBS with the control group without Cu–P pretreatment. Combined with universal adhesives PBU and SBU, the H–Cu and L-Cu groups also showed significantly increased μ-TBS ( P < 0.01). Conclusion The copper-based pretreatment in combination with universal adhesives improved the dentin microtensile bond strength.
研究领域:
牙科材料
·
粘接牙科学
·
牙科研究
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Jujun Yuan,Xiaofan Li,Jun Liu,Shiyong Zuo,Xiaokang Li,Fangkun Li,Yunfei Gan,Haishan He,Xijun Xu,Xianke Zhang,Junxia Meng
The distinctive pomegranate-like Nb 2 O 5 /Carbon@ N -doped carbon (Nb 2 O 5 /C@NC) composites are fabricated using hydrothermal method integrated with nitrogen doped carbon coating procedure. For the SIBs anode, the Nb 2 O 5 /C@NC composites present superior rate character and sustainable capacity (117 mAh g −1 upon 1000 cycles at 5 A g −1 ). The in-situ X-ray diffraction (XRD) is utilized to research its sodium storage mechanism. Furthermore, for PIBs, the Nb 2 O 5 /C@NC composites present sustainable capacity (81 mAh g −1 upon 1000 cycles at 1 A g −1 ). The outstanding performance of Nb 2 O 5 /C@NC composites is ascribed to its unique architecture, in which Nb 2 O 5 nanocrystals embedded in porous carbon can restrain agglomeration of Nb 2 O 5 nanocrystals, enhance electron/ion diffusion kinetics , and ensure electrolyte accessibility, and moreover, NC shell layer can provide effective active sites and further increase ions/electrons transfer.
研究领域:
材料科学
·
电化学
·
纳米能源材料
·
储能技术
·
先进电池
✓ 已验证
DOI
高影响因子
Chemical Science
·
2022
·Vol. 13
·期 25
·7575-7580
·
IF 9.969
Ang Li,Changfeng Li,Peixun Xiong,Jinfeng Zhang,Dongling Geng,Yunhua Xu
Layered transition metal oxides (LTMOs) are a kind of promising cathode materials for potassium-ion batteries because of their abundant raw materials and high theoretical capacities. However, their synthesis always involves long time calcination at a high temperature, leading to low synthesis efficiency and high energy consumption. Herein, an ultra-fast synthesis strategy of Mn-based LTMOs in minutes is developed directly from alkali-transition metal based-metal–organic frameworks (MOFs). The phase transformation from the MOF to LTMO is systematically investigated by thermogravimetric analysis, variable temperature optical microscopy and X-ray diffraction, and the results reveal that the uniform distribution of K and Mn ions in MOFs promotes fast phase transformation. As a cathode in potassium-ion batteries, the fast-synthesized Mn-based LTMO demonstrates an excellent electrochemical performance with 119 mA h g−1 and good cycling stability, highlighting the high production efficiency of LTMOs for future large-scale manufacturing and application of potassium-ion batteries.
研究领域:
材料科学
·
电化学
·
能源存储
·
无机化学
·
纳米材料
✓ 已验证
DOI
高影响因子
Journal of Physical Chemistry Letters
·
2020
·
IF 6.71
Lei Meng,Chen He,Wei Ji,Fei Yen
We observe sharp step-down discontinuities in the magnetic susceptibility of NH4H2PO4 and NH4H2PO4-d60 (60% deuterated) along the a- and c-axes occurring exactly at their antiferroelectric transition temperatures. For the case of KH2PO4, less pronounced discontinuities occur at the ferroelectric transition temperature. To explain this, we treat the acid protons as individual oscillators that generate current elements that translate to magnetic forces in near resonance with each other. With decreasing temperature, the resonant forces become more commensurate, which amplifies a disproportionate drop off of two types of magnetic forces to eventually trigger the structural phase transitions. For the case of NH4H2PO4, the associated internal magnetic field appears to aid the NH4+ to order at a higher temperature. At 49 K, a shoulder-like anomaly in both NH4H2PO4 and KH2PO4 is attributed to a possible onset of macroscopic quantum tunneling of protons. Our findings bring forth a new category of intrinsic multiferroic systems.
研究领域:
凝聚态物理
·
材料科学
·
固态物理
·
磁学
·
铁电学
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2020
·
IF 8.247
Tianjiang Sun,Qingshun Nian,Shibing Zheng,Xuming Yuan,Zhanliang Tao
Aqueous zinc-ion batteries (ZIBs) are gaining widespread attention owing to their intrinsic safety and low cost. However, it is still a challenge that finding robust cathode materials to build a high-energy-density aqueous ZIBs. Here, we synthesize a novel layered K 0.41 MnO 2 ·0.5H 2 O (KMO) cathode material for aqueous ZIBs. The constructed Zn//KMO battery shows an ultrahigh discharge capacity of 425 mAh g −1 and a remarkable energy density of 503 Wh kg −1 at 175 mA g −1 , as well as an good durability over 1500 cycles with no obvious capacity fading. A comprehensive study suggests that the water molecules can intercalate into layered KMO with H + and Zn 2+ ions during discharging process. The co-intercalating water not only facilitates ions insertion, but serves as pillars to stabilize the structure of KMO. This work demonstrates the mechanism about water cointercalation and provides a way for designing high-energy-density aqueous ZIBs.
研究领域:
电化学储能
·
材料科学
·
能源化学
·
无机化学
·
电池技术
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Yujie Yang,Linlin Wang,Suyuan Zeng,Kangning Zhao,Qian Wu,Li Yan,Haoyu Tian,Zheng Jiao,Jiujun Zhang
Building a proper flexible electrode with high cycling stability, rate capacity and initial coulombic efficiency (ICE) for flexible potassium-ion batteries (PIBs) remains a challenge. Herein, nitrogen/phosphorus co-doped carbon coated FeP nanorods arrays on carbon cloth (FeP@N, P C NRs/CC) as high-rate capable flexible self-supporting anode was successfully fabricated. The composite electrode combines the advantages of FeP nanorods arrays (FeP NRs), carbon cloth (CC) and N, P co-doped carbon shell (N, P–C), which comprehensively improves the electrochemical stability of the flexible electrode, while the open space between FeP nanorods can facilitate electrolyte impregnation and enhance K + transfer, thus effectively elevating the corresponding rate capability. For the FeP@N, P C NRs/CC electrode, it delivers a reversible capacity of 388.8 mA h g −1 at 0.5 A g −1 up to 400 cycles. Even at 1.5 A g −1 , it can still achieve a remarkable rate capacity of 346.9 mA h g −1 . Moreover, the assembled soft-packed cell can always light the LED lights when it is bent at different angles, which exhibits excellent mechanical flexibility.
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2019
·
IF 7.467
Cheng Lin,Liuzhang Ouyang,Chaojin Zhou,Renzong Hu,Lichun Yang,Xusheng Yang,Huaiyu Shao,Min Zhu
Potassium-ion batteries (PIBs) are becoming one of the promising alternative metal-ion battery systems to lithium-ion batteries due to the abundance and low cost of potassium . Among the anode materials for the metal-ion battery systems, phosphorus-based materials are attractive due to the low cost and their high theoretical-specific capacity. Herein, for the first time, we report the selenium -phosphorous-carbon (Se–P–C) amorphous composites prepared by the plasma-assisted ball milling method as the high-performance anode material for PIBs. In particular, when the amorphous Se–P composite anode with the molar ratio of 1:2 and the P-milling time of 30 h (Se–2P/C@30 h), the associated PIB delivers a high reversible capacity of 634 mA h g −1 at a current density of 0.05 A g −1 and excellent rate capability of 248.6 mA h g −1 at a current density of 1 A g −1 . Furthermore, the experimental characterization and analysis reveal the reaction mechanisms that K–P (K 2 P 3 ) and K–Se (KSe) phases are formed during the potassiation process. The present work provides a facile approach to achieve a promising anode material for K-ion batteries, and the preparation route can be viewed as a reference for the further development of phosphorous-based anodes with high capacity and long cycle life for PIBs.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米材料
·
无机化学
✓ 已验证
DOI
高影响因子
Materials Today Energy
·
2018
·
IF 0
Guangyao Ma,Chengjun Li,Fan Liu,Muhammad K. Majeed,Zhenyu Feng,Yanhua Cui,Jian Yang,Yitai Qian
Metal-organic frameworks (MOFs)-derived metal chalcogenides/carbon, has been developed as promising anode materials for lithium/sodium ion batteries. However, they are not explored for potassium-ion batteries yet. Here, ZIF-67 is employed as a self-sacrificed template to synthesize Co 0.85 Se nanoparticles in N-doped carbon as an anode material for potassium-ion batteries. In this composite, N-doped carbon enhances the electron conductivity, cushions the volume change and inhibits the aggregation of Co 0.85 Se upon cycling. Meanwhile, mesoporous structure shortens the diffusion distance of potassium ions , as well as increases the contact between electrolyte and electrode. These features endow this composite superior performances. It delivers a specific capacity of 114.7 mA h g −1 at 1000 mA g −1 after 250 cycles. At 2.0 A g −1 , the specific capacity still maintains at 110.7 mA h g −1 . The electrochemical performances of full cells based on Co 0.85 Se@NC as an anode material are also investigated. The result greatly spurs the exploration of metal chalcogenides as anode materials for potassium ion batteries .
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米材料
·
电池技术
✓ 已验证
DOI
APPLIED CLAY SCIENCE
·
2015
·
IF 2.467
Ting Li,Huoyan Wang,Zijun Zhou,Xiaoqin Chen,Jianmin Zhou
Non-exchangeable potassium (NEK) is released from minerals by chemical extraction methods through dissolution and cation-exchange reactions. Assessing the contribution of these two processes to release budgets is important to predicting plant/mineral interactions and soil sustainability . Three NEK extraction methods, 1 M boiling nitric acid (HNO 3 ), 2 M hot hydrochloric acid (HCl) and 0.2 M sodium tetraphenylboron (NaTPB), were applied to investigate the mechanisms of NEK release from trioctahedral biotite and dioctahedral muscovite . Atomic force microscopy and X-ray diffraction were used to investigate the surface morphology and transformation of mica, respectively. NEK released from biotite and muscovite through cation-exchange reaction accounted for 87.88%, 85.93% and 83.23%, 78.31% of the total extracted K when extracted by boiling HNO 3 and hot HCl, respectively, with channel and elliptical dissolution pits on mica surface. NEK extracted by NaTPB was an almost complete cation-exchange reaction, and the extracted micas showed an obvious vermiculitic character and no dissolution features. Results showed the release of NEK from micas is essentially a cation-exchange reactions in both acid and salt solutions, indicating that NEK released through cation-exchange reaction but not via dissolution may make up the main soil K pool available to plant.
研究领域:
土壤化学
·
矿物风化
·
植物营养
·
粘土矿物学
·
可持续农业
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Ting Li,Yikun Wang,Lingling Yuan,Qianwen Zhou,Shuangyan Qiao,Zhengqing Liu,Shaokun Chong
Conversion mechanism anode materials have been widely employed for potassium ion batteries (PIBs) due to high theoretical specific capacities. However, large volume expansion and poor electrochemical kinetics have become the key bottlenecks hindering its further development. Herein, α-MnSe nanorods wrapped by N-doped carbon and graphene (α-MnSe@NC@graphene) are constructed as anode materials for PIBs . The architecture can not only provide superior electrode integrity to buffer volume variation and maintain structure stability via synergistic effects of physical encapsulation and Mn-C chemical bonding, but also serve as conductive network to accelerate the electron transfer and K-ion diffusion. As a result, α-MnSe@NC@graphene composite delivers high initial charge specific capacity of 307.9 mAh·g −1 and great cycling stability over 250 cycles with the capacity retention of 232.8 mAh·g −1 at 50 mA·g −1 . Besides, superior rate capability (91.1 mAh·g −1 at 2.0 A·g −1 ) and long lifespan over 700 cycles at 1.0 A·g −1 with the low capacities decay rate of 0.064% per cycle can be acquired. Ex situ TEM and XPS results verify that K-ion insert into/extract from α-MnSe@NC@graphene through a conversion mechanism based on the Mn-ion redox site (MnSe + 2 K + + 2e - ↔ Mn + K 2 Se).
研究领域:
材料科学
·
电化学
·
纳米能源
·
储能技术
·
无机功能材料
·
先进电池技术
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Jie Song,Ye Xu,Yujue Wang,Shenghu Li,Siyi Yin,Wanglai Cen,Dan Xiao,Qian Zhao,Xicui Zhang,Yan Meng
Hard carbons are significant in sodium-ion batteries (SIBs) and potassium-ion batteries (PIBs). However, the structural defects of hard carbons lead to poor rate performance and cycling stability, which need further improvement. The waste cooking oil was used as the precursor to synthesize 3D carbon nanosheets (NWCOC) with amino nitrogen functional groups, multi-layered pores, and expanded interlayer spacing. The excellent electrochemical properties of NWCOC were investigated and it was demonstrated that NWCOC can significantly improve the adsorption of Na + /K + on hard carbons, substantially enhancing the embedding/de-embedding of Na + /K + , reducing the diffusion distance of ions and electrons, and improving their adaptability to volume changes. In situ XRD and Raman characterization reveal that the Na storage mechanism of NWCOC is mainly based on adsorption/intercalation-filling. Combined with density functional theory, it is shown that the porous structures doped with nitrogen have a greater propensity for ion adsorption, resulting in increased ion capture and storage. As expected, NWCOC650 exhibits high capacities of 489.4 and 388.3 mAh/g in SIBs and PIBs. NWCOC650 displays superior performance in the Na 3 V 2 (PO 4 ) 3 /NWCOC650 full cell, achieving a capacity of 107.84 mAh/g. This work presents a new perspective on the synthesis and mechanisms of high-performance anodes for SIBs and PIBs.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米材料
·
电池技术
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Yong Tong,Yuanji Wu,Xi Liu,Zhisong Chen,Hongyan Li
Carbon-based anode materials have become a research hotspot for alkali metal ion batteries. Crucially, the electrochemical performance of carbon materials must be improved by appropriate means such as micro-nano structure design and atomic doping. Herein, antimony doped hard carbon materials are prepared by anchoring Sb atoms on nitrogen-doped carbon (Sb N C). The coordination of non-metal atoms can better disperse Sb atoms on the carbon matrix, and the synergistic effect between Sb atoms, coordinated non-metal atoms, and hard carbon matrix endows Sb N C anode with good electrochemical performance. When used in sodium-ion half-cells, the Sb N C anode showed high rate capacity of 109 mAh g −1 at 20 A g −1 and good cycling performance (254 mAh g −1 at 1 A g −1 after 2000 cycles). In addition, when used in potassium-ion half-cells, the Sb N C anode exhibited initial charge capacity of 382 mAh g −1 at 0.1 A g −1 and rate capacity of 152 mAh g −1 at 5 A g −1 . This research shows that compared with ordinary nitrogen doping, Sb-N coordination active sites on carbon matrix can provide much more adsorption capacity, improve ion filling and diffusion properties as well as enhance the kinetics of electrochemical reaction for the sodium/potassium storage.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）