NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 21
·10153-10161
·
IF 3.3
Kangsheng Shi,Wensheng Yang,Qiaodan Wu,Xingke Yang,Ruiya Zhao,Ziqiang She,Quan Xie,Yunjun Ruan
The structural deformation during the embedding/de-embedding of K+ with a large ionic size is an important factor limiting the development of potassium-ion batteries (PIBs). The iron-based mixed polyanionic material Na4Fe3(PO4)2(P2O7) (NFPP) makes an excellent cathode material for PIBs due to its low cost, non-toxicity, suitable theoretical capacity, and stable structure. Here, a 3D reduced graphene oxide network wrapped NFPP (NFPP@rGO) was synthesized using a freeze-drying and subsequent annealing treatment. The NFPP@rGO material as a PIB cathode achieves a high discharge specific capacity of 119.1 mA h g−1 at 0.1C and 80.3 mA h g−1 even at 2C current density, and retains 82.1% of its initial capacity after 500 cycles. Ex situ XPS and XRD are utilized to understand the K+ storage mechanism of NFPP@rGO in PIBs. The superior electrochemical properties are due to the 3D reduced graphene oxide network, which improves the material's electrical conductivity and K+ diffusion rate, and stabilizes structural deformation during charge and discharge. These results indicate the feasibility of the NFPP@rGO cathode material for PIBs.
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
DOI
高影响因子
BIOSYSTEMS ENGINEERING
·
2021
·
IF 4.123
Jiyong Shi,Yueying Wang,Zhihua Li,Xiaowei Huang,Tingting Shen,Xiaobo Zou
Nitrogen (N), magnesium (Mg), and potassium (K) deficiency all result in the decrease of chlorophyll density (CH.D) in cucumber leaf, but it is difficult to differentiate N/Mg/K-deficient leaves using CH.D. New nutrient indicators based on CH.D distribution features of the whole cucumber leaf were proposed to simultaneously diagnose N/Mg/K-deficient cucumber plants. CH.D distribution map in N/Mg/K-deficient and control leaves were determined non-destructively using hyperspectral imaging with the wavelength range of 430–960 nm. Compared with the CH.D distribution map of control group leaves, a decrease in CH.D could be observed on the whole area of N-deficient leaves, Mg-deficient leaves presented pixels with low CH.D between main leaf vein, and pixels with low CH.D at the border of K-deficient leaves. Distribution features were extracted from the CH.D distribution map and were employed to diagnose N/Mg/K-deficient leaves simultaneously, with the diagnostics rates of 96.67%. The results indicated that CH.D distribution features can realize the simultaneous diagnosing in the early stage of N/Mg/K deficiency and timely guidance of top dressing is of great significance to increase yield.
研究领域:
植物营养学
·
农业遥感
✓ 已验证
DOI
高影响因子
FOOD HYDROCOLLOIDS
·
2019
·
IF 5.839
Yingying Dong,Chengrong Wen,Tingting Li,Chunhua Wu,Hang Qi,Miao Liu,Zhongli Wang,Beiwei Zhu,Shuang Song
The effects of positive and neutral charged amino acids (Arginine (Arg) and Glutamine (Gln)) on the gel properties and microstructure of potassium iota Carrageenan (KIC) were investigated. The findings suggested that the gel melting temperature (T g ) of KIC gels increased from 36 °C to 43 °C with the Gln concentration increasing, and the elastic modulus ( G’ ) increased as well. However, with the increase Arg concentration, T g and G’ of gels increased gradually and then decreased, and the maximum T g (46 °C) and G’ were obtained at concentrations of 0.05% Arg. LF-NMR results showed that the addition of Gln decreased the position of T 23 , indicating a negative effect of Gln on the water holding capacity and water mobility of KIC gels, while the addition of Arg increased the position of T 23 , showing the opposite effect. Compared to the pure KIC and Gln-KIC (GKIC), Arg-KIC (AKIC) showed a more regular network structure and a stronger water holding capacity . In addition, few chemical bonds were formed between amino acid and KIC. It is electrostatic attraction between KIC and Arg and the crowding of Gln that contributed to better gel properties. Taken together, our results provide insights for the further application of GKIC or AKIC gels in food and medical applications.
研究领域:
食品科学
·
生物化学
✓ 已验证
DOI
高影响因子
Journal of Water Process Engineering
·
2020
·
IF 3.465
Guanyi Chen,Chuanbin Wang,Jingnan Tian,Juping Liu,Qingjie Ma,Bin Liu,Xiangping Li
Removal of heavy metals from water by biochar is necessary and benefit for human life and environmental protection. In this study, biochar from sludge (SB), cow dung (DB), corn stalk (CB) and willow branches (WB) were synthesized and activated by potassium hydroxide (KOH), and these biochars were used as adsorbent to remove divalent cadmium ion (Cd(II)) from water. The materials were further characterized by using N 2 -sorption, scanning electron microscopy (SEM), elemental analysis, thermal gravity and differential thermal gravity (TG/DTG) and fourier transform infrared spectroscopy (FTIR). It found that external surface area of biochar had significant effect on the adsorption of Cd(II). Batch adsorption experiments were performed to investigate the effects of various parameters, including initial pH value, adsorbent dosage, concentration of Cd(II) and adsorption time. The results showed that CB had a better adsorption ability to remove Cd(II) from water than the other biochars. The pseudo-second-order and pseudo-first-order kinetics models were introduced to study the adsorption kinetics of Cd(II) by CB. The Freundlich model and Langmuir model were both fit for the experimental isotherm data. The maximum adsorption capacity of 40 mg/g was obtained by CB according to the experimental isotherm data by Langmuir model.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 44
·25268-25273
·
IF 10.733
Jun Han,Kunjie Zhu,Pei Liu,Yuchang Si,Yujun Chai,Lifang Jiao
Herein, the preparation of CoSb nanoparticles embedded in carbon nanofibers with a raised surface (N-doped CoSb@C nanofibers) via the electrospinning method is reported for the first time. The distinct structure facilitates the pseudocapacitive behaviors, which is the key to obtain fast kinetics and long cyclability. N and Co elements can not only optimize the electronic configuration but also buffer the volume changes of the material during cycling. For potassium-ion batteries, the capacity maintains 250 mA h g−1 after 500 cycles at 1 A g−1, and for sodium-ion batteries, the capacity keeps 413 mA h g−1 after 1000 cycles at 1 A g−1. Thus, this work makes a great contribution towards exploring high-capacity anodes for practical potassium-ion batteries and sodium-ion batteries.
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
DOI
高影响因子
ACS Nano
·
2020
·
IF 14.588
Peitao Xiao,Shuo Li,Chengbing Yu,Ying Wang,Yuxi Xu
The potassium-ion battery (PIB) has been recognized as a promising low-cost and high-energy battery; however, it suffers from a relatively low capacity and inferior cycling performance compared with current electrode materials. Herein, we report an effective interface engineering strategy to prepare metal–organic framework (MOF) nanocrystals tightly encapsulated by reduced graphene oxide (rGO) via strong chemical interaction as a free-standing anode for PIB. Based on experimental analysis and theoretical calculations, we systematically investigated the effect of the chemical-bonded interface between MOF nanocrystals and conductive rGO and revealed that the strong chemical interface can substantially enhance the adsorption energy and ion transport kinetics of the potassium ion within the MOF nanocrystals compared to the physical mixture of MOF and rGO with almost the same microscopic morphologies. As a result, such an MOF-rGO hybrid with strong interfacial chemical couplings delivered an ultrahigh reversible capacity of 422 mAh g–1 at 0.1 A g–1, superior rate performance (202 mAh g–1 at 5 A g–1), and outstanding long-term cycling performance (an ultralow decay rate of 0.013% per cycle after 2000 cycles at 2 A g–1), which are not only significantly better than those of the physical mixture of MOF/rGO but also among the best for anodes for PIB reported thus far.
研究领域:
材料科学
·
电化学
·
纳米技术
✓ 已验证
DOI
PubMed
高影响因子
ENERGY & FUELS
·
2022
·
IF 4.654
Chunyan Wang,Pengyuan Wang,Dandan Ouyang,Nan Xue,Xueyan Xue,Yue Zhang,Hui Zhu,Jiao Yin
Potassium-ion hybrid capacitors (PIHCs), which are assembled by a capacitor-type electrode with a battery-type electrode, have stimulated great attention owing to their integrated advantages including high energy density and power output. Currently, most of the recorded PIHCs are based on inorganic components, which bring about environmental and resource problems. Herein, to circumvent these issues, humic acid (HA), which features resource abundance, cost-effectiveness, and environmental benignity, is explored as anode material for K+ storage. Benefitting from the abundance of oxygen-containing functional groups in the HA skeleton, HA presents both a satisfactory capacity (164.1 mAh g–1 at 20 mA g–1) and desirable cyclability (70.2 mAh g–1 after 1000 cycles at 50 mA g–1). Meanwhile, the storage mechanism analysis based on electrochemical technologies and ex situ FTIR spectrum reveals that the surface-driven capacitive mechanisms dominate the storage of K+ through the reversible transformation between C═O and C-O-K functionalities. Cooperating with activated carbon (AC) derived from pear wood charcoal, the fabricated hybrid capacitor (HA//AC) presents a remarkably high energy density and power density (79.1 Wh kg–1/186.94 kW kg–1). This work not only furnishes a new possibility to develop green organic materials for alkali metal-ion storage but also promotes the advancement of PIHCs.
研究领域:
材料科学
·
环境科学
·
电化学
✓ 已验证
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2021
·Vol. 8
·期 14
·3547-3555
·
IF 6.569
Yan Chen,Chunli Hu,Zhi Fang,Jianggao Mao
Cyanurate motifs are emerging functional basic blocks (FBBs) for nonlinear optical (NLO) materials and birefringent materials. Herein, we report two new potassium lead(II) hydroisocyanurates, namely, K2Pb(H2C3N3O3)4(H2O)4 (I) and K3Pb(H2C3N3O3)5(H2O)6 (II). I and II belong to acentric Cm and centric C2/m, respectively. Compound I features a novel 3D network formed by 2D [K2PbO8(H2O)4]12− anionic layers interconnected by (H2C3N3O3)− anions. The 2D [K2PbO8(H2O)4]12− anionic layer is composed of 1D chains of edge-sharing K(1)O6 and K(2)O8 being further interconnected by 8-coordinated Pb2+ ions. Compound II exhibits a characteristic 3D framework based on 2D [K3PbO11(H2O)6]17− anionic layers interlinked through (H2C3N3O3)− groups, and the 2D [K3PbO11(H2O)6]17− anionic layer is based on K–O/H2O chains bridged by Pb2+ ions. Powder second harmonic generation (SHG) measurements of I revealed a moderate SHG response of approximately 2.6 × KDP with a type I phase-matching behavior under 1064 nm laser radiation. Theoretical calculations of I and II revealed their birefringence to be 0.325 and 0.193@532 nm, respectively. Their impressive optical properties mainly stem from stereochemically active lone pair (SCALP) Pb2+ cations and the planar π-conjugated (H2C3N3O3)− groups.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
CHEMOSPHERE
·
2022
·
IF 8.943
Haiqing Wang,Zhenda Liang,Chao Liu,Lishan Zhu,Yongtao Xu,Li Zhou,Bing Yan
Developing low-cost and efficient materials for dye pollutant removal under mild condition remains a great challenge. Here K + and Tb 3+ co-doped porous MnO 2 (K–Tb–MnO 2 ) nanoparticles with tailored properties including crystal structure, surface area and catalytic activity have been synthesized. Experimental results reveal that K–Tb–MnO 2 nanoparticle has higher specific surface area, Mn 3+ content and surface oxygen vacancies than pristine MnO 2 nanoparticle and single-doped MnO 2 materials, showing the uniqueness of dual-doped metal ions . Using methyl blue (MB) as a model pollutant, its removal efficiency by K–Tb–MnO 2 nanoparticles within 5 min is 93.6%, which is 18, 8.3, and 2.9 times higher than that of MnO 2 , K–MnO 2 , and Tb–MnO 2 nanomaterials, respectively. Oxalic acid triggered MnO 2 material dissolving assay and FT-IR spectrum suggested that remarkable performance of K–Tb–MnO 2 nanoparticle toward MB removal can be attributed to a combined effect of adsorption (16% MB removal) and catalytic degradation (84% MB removal). Moreover, K–Tb–MnO 2 nanoparticle mediated MB degradation is demonstrated to be a combination of non-radical oxidation by Mn 3+ and radical-participated degradation, with 1 O 2 as the main species. And the intermediates and pathways of MB degradation were studied by liquid chromatography-mass spectrometry. Importantly, cell viability experiment suggests that the toxicity of MB dye could be efficiently alleviated after the treatment with K–Tb–MnO 2 nanoparticle. These results demonstrate the great potential of the novel K–Tb–MnO 2 particles to be used as a highly effective nanomaterials to reduce the risk of dye wastes toward the environment and human health.
研究领域:
环境科学
·
材料科学
·
生物学
✓ 已验证
DOI
PubMed
高影响因子
Journal of Renewable Materials
·
2021
·Vol. 9
·期 10
·1673-1684
·
IF 1.67
Li Qiaoguang,Yan Xuming,Chen Jialong,Shu Xugang,Jia Puyou,Liang Xiangjun
Environmental cleaning is an important aspect of bacteria control. Ethyl cellulose microcapsules containing potassium monopersulfate (PMCM) were prepared by emulsified solvent diffusion method. The chemical structure and microstructure of the obtained PMCM was characterized by methods
of Fourier transform infrared spectroscopy (FT-IR), optical microscopy, scanning electron microscopy and X-ACT energy dispersive X-ray spectroscopy. The SEM micrographs of the PMCM containing 21.6% of C, 46.8% of O, 10.7% of S and 19.4% of K was relatively smooth. Thermal stability, sustained
release performance, and antimicrobial activity of PMCM were investigated. The results showed that the drug loading and encapsulation efficiency of PMCM were 30.3% and 42.6% respectively. Potassium monopersulfate was fully released after 8 h, following a Fickian diffusion mechanism. Results
showed that the microcapsules prepared with a high concentration of potassium monopersulfate solution showed a good antimicrobial effect. The microcapsule wall of the resulting PMCM increased with increasing ethyl cellulose content and had high thermal stability from the data of 69% residue
rate. The excellent thermal stability and high sustained release performance of PMCM showed high application value.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
CHEMICAL PHYSICS LETTERS
·
2018
·
IF 1.686
Huaiwei Zhang,Jianbo Qi,Zhenguo Ji
Synergic effects of rare earth-magnesium based hydrides (LaH 3 -MgH 2 ) on thermal dehydrogenation of potassium borohydride (KBH 4 ) are discussed in the paper. Comparing to above 675 K for the LaH 3 -MgH 2 or KBH 4 , the dehydrogenation temperature can be decreased to 346 K for the composites (LaH 3 -MgH 2 -KBH 4 ). The apparent activation energy of desorption process for the mixture is also greatly reduced. On the other hand, the products in the temperature programmed desorption process are also illustrated.
研究领域:
材料化学
·
无机化学
·
能源材料
·
储氢材料
·
固态化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Dan Yang,Qingfeng Guo,Libing Liao,Yidi Zhang,Lefu Mei,Haikun Liu
In this paper, K 3 ScF 6 :Er 3+ ,Yb 3+ up-conversion luminescent materials with cryolite structure were synthesized via solid-state method. The X-ray diffraction (XRD), scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS) and photoluminescence spectroscopy (PL) under the excitation of a 980 nm laser with different power density were used to investigate the phase structure, elemental composition , and up-conversion luminescence properties of K 3 ScF 6 :Er 3+ ,Yb 3+ . The quenching concentrations of Yb 3+ and Er 3+ were confirmed to 0.15 and 0.05 (mol concentration) in this system, respectively. Upon 980 nm excitation, the K 3 ScF 6 :Er 3+ ,Yb 3+ showed a typical transition of Er 3+ which contains two main bands in the visible region that green and red. According to the fitting result of the pump power dependence of up-conversion intensity, all the green and red up-conversion emission of K 3 ScF 6 :0.05Er 3+ ,0.15 Yb 3+ belong to the two-photon process. To better understand the origin of radiation and energy transfer mechanism of the red and green up-conversion, the possible mechanism and electron transition process were also discussed.
研究领域:
材料科学
·
无机化学
·
光功能材料
·
固体化学
·
发光物理
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）