Journal of Energy Storage
·
2024
·
IF 8.9
Lupeng Zhang,Wen Liu,Chenxi Liang,Yiyang Liu,Haining Wang,Shanfu Lu,Yan Xiang
Potassium-ion batteries (PIBs) have garnered considerable interest for promising stationary energy storage devices. However, the current researches of carbon anode for PIBs still face the severe challenge of low areal capacity, unsatisfactory kinetics rate and low initial coulombic efficiency from the practical application perspective. To solve these issues, we design Fluorine-doped Typha orientalis fibre (FTOF) membrane by constructing integrated architecture and regulating electronic structure, and this FTOF membrane is used as freestanding carbon anode. This novel carbon anode not only retains integrated architecture with bamboo-like microfiber, but also presents abundant F-doped site and vacancy defects. As a result, the FTOF electrode delivers high areal capacity (1.12 mAh cm −2 ) with initial coulombic efficiency (62.5 %), stable cycling performance (0.41 mAh cm −2 after 500 cycles) and excellent rate performance (0.50 mAh cm −2 at 4 mA cm −2 ), overmatching most of the reported studies. Theoretical calculations on K adsorption affinities at various configurations illuminate the synergistic effects of F-doping and vacancy defects in improving K + adsorption kinetics. Moreover, full cells deliver superior cycling performance with high capacity retention of 90.2 % after 1000 cycles. This work provides a rational electrode design strategy and theoretical guidance to achieve ultra-high areal capacity carbon anode for PIBs.
研究领域:
材料科学
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能源存储
✓ 已验证
产品关联
DOI
高影响因子
MOLECULES
·
2025
·Vol. 30
·期 3
·729
·
IF 4.6
Heying Chu,Yong Li,Yuanjie Liu,Xueping Chai,Hongzhou Zhang,Jingchuan Zhang
Bismuth-based materials that adhere to the alloy/dealloy reaction mechanism are regarded as highly promising anode materials for potassium-ion batteries due to their high volume-specific capacity and moderate reaction potentials. However, their commercial viability has been limited by the effects of structural collapse due to volume distortion and impeded electron conduction, resulting in rapid capacity decline. In this work, a carbon-coated nanosized BiPO4rod (BiPO4@C) was designed and fabricated to overcome the aforementioned challenges through the architecture engineering and anionic-tuning strategy. In particular, the nanosized nanorods significantly reduce the volume expansion; the incorporation of the bulk and open-skeleton anion PO43−serves to mitigate the considerable volume distortion and generates the high ionic conductivity product (K3PO4) to ameliorate the poor ionic transport due to the structural deformation. The elaborated BiPO4rods exhibit high specific capacity (310.3 mAh g−1, at 500 mA g−1), excellent cycling stability (over 700 cycles at 500 mA g−1) and superior rate performance (137.8 mAh g−1, at 1000 mA g−1). Systematic ex-situ XRD and TEM, as well as kinetic tests, have revealed the “conversion-multistep alloying” reaction process and the “battery-capacitance dual-mode” potassium storage mechanism. Moreover, the thick electrodes showed excellent specific capacity and rate performance, demonstrating their significant application potential in the next generation of SIBs.
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
Science Bulletin
·
2024
·
IF 18.8
Yida Zhang,Zhentao Ma,Shaokang Yang,Qingyu Wang,Limin Liu,Yu Bai,Dewei Rao,Gongming Wang,Hongliang Li,Xusheng Zheng
Catalytic conversion of nitrate (NO 3 − ) pollutants into ammonia (NH 3 ) offers a sustainable and promising route for both wastewater treatment and NH 3 synthesis. Alkali cations are prevalent in nitrate solutions, but their roles beyond charge balance in catalytic NO 3 − conversion have been generally ignored. Herein, we report the promotion effect of K + cations in KNO 3 solution for NO 3 − reduction over a TiO 2 -supported Ni single-atom catalyst (Ni 1 /TiO 2 ). For photocatalytic NO 3 − reduction reaction, Ni 1 /TiO 2 exhibited a 1.9-fold NH 3 yield rate with nearly 100% selectivity in KNO 3 solution relative to that in NaNO 3 solution. Mechanistic studies reveal that the K + cations from KNO 3 gradually bonded with the surface of Ni 1 /TiO 2 , in situ forming a K-O-Ni moiety during reaction, whereas the Na + ions were unable to interact with the catalyst in NaNO 3 solution. The charge accumulation on the Ni sites induced by the incorporation of K atom promoted the adsorption and activation of NO 3 − . Furthermore, the K-O-Ni moiety facilitated the multiple proton-electron coupling of NO 3 − into NH 3 by stabilizing the intermediates.
研究领域:
环境科学
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催化化学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Surfaces and Interfaces
·
2024
·
IF 5.7
Shimei Lei,Yuan Yuan,Huanyu Zhu,Hao Yi,Guangfeng Dong,Songliang Ma,Feifei Jia,Shaoxian Song
Particle size and surface morphology have a substantial influence on flotation. Conventional grinding methods usually destroy the surface morphology while controlling the particle size. In this work, we propose a new strategy to control particle size and morphology through crystalizing regulation instead of grinding to protect the crystal face in the flotation process. Scanning electron microscopy results illustrate that the surface morphology of crystallization-regulated particles is better protected than grinding-regulated particles. The superior flotation effect of the crystallization-regulated products was validated by micro-flotation tests. The mechanism of enhanced flotation by crystalline modulation was further analyzed with the help of induction time, adhesion-desorption force, collector adsorption, and theoretical calculations, which showed that the crystallization-regulated products were more hydrophobic and had more stable adherence to the flotation bubbles. The innovative method of crystalline modulation developed in this work to improve the flotation effect provides a novel way to protect the crystal shape for the efficient flotation of potash salts, which is of great significance for the reduction of cost and increase of efficiency in the flotation process of potash salts.
研究领域:
矿物加工工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Deng Zhao,Yu Wang,Guanwei Wang,Wenming Han,Hua Liu,Huashan Wang,Hui Liu,Shuai Guo
Although alkali metal potassium (K)-catalyzed char gasification has been widely studied, the detailed mechanism of this process is still not fully understood. To study this catalytic mechanism in more detail, high-temperature in-situ DRIFTS experiments were carried out for the gasification of cellulose char with K and cellulose char without K under H 2 O and O 2 atmospheres, transient gasification experiment of char with K under H 2 O atmosphere, and char with K gasification under isotope water atmospheres. Peaks at 1945 cm −1 and 2020 cm −1 were observed. Combined with the theoretical spectra obtained by quantum chemical simulations and the prediction of catalytic gasification intermediates by molecular dynamics simulations, these two peaks were confirmed to represent char-polyynes species. Based on this result, a new mechanism is proposed: K interacts with carboxyl groups and aromatic ketones to promote desorption, thereby exposing active sites. Then, K reacts with the edge of the activated char to form numerous highly active char-polyynes species. The polyynes edge of this char-polyynes phase provides ideal adsorption–desorption sites, enabling further reaction with the gasifier. Thus, gas desorption is promoted. The adsorption and desorption peaks of catalytic gasification under the H 2 O atmosphere were located at 1400 cm −1 and 1300 cm −1 , and these peaks represented stable adsorption states and unstable desorption precursors, respectively. Based on this, adsorption–desorption theory was analyzed more comprehensively, and the adsorption–desorption process was divided into three stages: initial adsorption, intermediate conversion, and desorption. The comprehensive new mechanism proposed in this paper provides a better understanding of the nature of char catalytic gasification at a deeper level.
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
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2016
·Vol. 16
·期 4
·3646-3652
·
IF 1.338
Yang Ailing,Wang Ning,Wang Yujin,Li Shunpin,Wang Lele,Yang Yun,Bao Xichang,Yang Renqiang
Silver nanoparticles (NPs) with diameters less than 25 nm, and 5, 10, 15, 20-tetrakis(4-carboxy-phenyl) porphyrin potassium salt (K4TCPPS) was synthesized. By adding silver colloids into the K4TCPPS solutions, the fluorescence concentration quenching of the K4TCPPS
solutions was improved between 1×10−6–5×10−4 M, depending on the size of the Ag NPs, the concentration of the K4TCPPS and the excitation wavelength. Under excitation wavelengths of 360 and 414 nm, the enhancement was in the range
of 0.34–22.8, and 0.71–82.46, respectively. The enhancement increased with decreasing size of the Ag NPs. At the two highest enhancements, the concentrations of the K4TCPPS solutions were 1×10−4 and 1×10−5 M respectively,
and the size of the Ag NPs was about 5 nm. The main reasons for the fluorescence enhancing effect are due to fluorescence resonance energy transfer (FRET) between K4TCPPS molecules and Ag NPs, and decreased collision quenching between free K4TCPPS molecules, and free K4TCPPS
molecules with Ag NPs. Our results showed that Ag NPs with sizes of about 5 nm can effectively improve the fluorescence concentration quenching of K4TCPPS solutions. This result also suggests that it is possible to use noble metal NPs to improve fluorescence concentration quenching.
研究领域:
材料科学
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光学
·
生物化学
✓ 已验证
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Zhuojia Xie,Zhengguang Zou,Xinyu Jiang,Weijian Zhang
The effects of K + doping on structure, magnetic characteristics , magnetocaloric properties, and critical behavior of La 0.7-x Nd 0.1 Sr 0.2 K x Mn 0.95 Ni 0.05 O 3 (LNSKMNO) ceramics (x = 0.00, 0.05, and 0.10) were investigated. The X-ray diffraction and refinement findings revealed that LNSKMNO exhibited a distinctive rhombohedral structure of the R-3c space group (No. 167). To validate the chemical composition of LNSKMNO ceramics, EDS spectroscopy and X-ray photoelectron spectroscopy (XPS) were utilized. The magnetization of LNSKMNO exhibited a temperature-dependent behavior, revealing a phase transition from the ferromagnetic (FM) phase to the paramagnetic (PM) phase at approximately the Curie temperature (Tc). By utilizing normalization and Banerjee's criterion, the magnetic phase transition of LNSKMNO was determined to be a second order magnetic phase transition. The maximal magnetic entropy ( − Δ S M max ) of LNSKMNO around Tc was 4.24, 4.53, and 4.07 J/(kg K) at the 5 T external magnetic field (H). The Kouvel-Fisher approach and modified Arrott plot were used for determining the values of the critical exponents of β , γ , and δ . The critical exponents for LNSKMNO ceramics generally conformed to those obtained based on the Mean-field model.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
Analytical Methods
·
2019
·Vol. 11
·期 14
·1930-1938
·
IF 2.378
Junyang Xiao,Mengyun Wang,Zijun Pang,Lin Dai,Jinfeng Lu,Jing Zou
Recently, increasing attention has been paid for using commercial peracetic acid (PAA) solution as an efficient disinfectant or a strong oxidant in water treatment. Simultaneous determination of PAA and hydrogen peroxide (H2O2) is vital because PAA solution is commonly available as a mixed solution containing the peroxides PAA and H2O2. In this study, a simple, rapid and reliable spectrophotometric method for the simultaneous determination of PAA and H2O2 was developed. This method was based on the rapid oxidation of excess potassium iodide by PAA and H2O2 in the presence of ammonium molybdate to yield yellow-colored triiodide ions (I3−) that could be quantitatively measured using an UV-Vis spectrophotometer. The absorption of generated I3− at 350 nm increased linearly (R2 > 0.999) with the concentrations of total peroxides and PAA in the range of 0–70 μM. The sensitivities were respectively measured to be as high as 2.596 × 104 M−1 cm−1 for total peroxides and 2.616 × 104 M−1 cm−1 for PAA, while the corresponding limits of detection were calculated to be as low as 0.19 μM and 0.18 μM. The concentration of the H2O2 coexisting in PAA solution was obtained by subtracting the concentration of PAA from the concentration of total peroxides. The concentrations of total peroxides, PAA and H2O2 in practical water samples measured with this proposed method were in good agreement with the values measured with the earlier reported spectrophotometric method using N,N-diethyl-p-phenylenediamine as the indicator. Therefore, this proposed spectrophotometric method could be considered as an alternative method for the simultaneous determination of PAA and H2O2 coexisting in PAA solution.
研究领域:
分析化学
·
环境科学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 25
·12705-12715
·
IF 11.301
Xinming Wu,Han Wang,Zhilin Zhao,Bin Huang
Although potassium-ion batteries have been widely studied because of their low cost and high theoretical capacity, the origin of the poor potassium-ion storage kinetics and low structural stability still remains elusive mainly due to the large size of K+ (0.138 nm). Herein, we report an interstratification-assembly strategy via van der Waals interactions to design a novel BPE@V2CTx hybrid anode, wherein black phosphorene (BPE) and V2CTx MXene are derived from their individual 2D nanosheets. The coupled BPE@V2CTx hybrid anode with a 2D stacked interstratification structure and large specific surface area could efficiently take advantage of BPE and V2CTx nanosheets and create more active sites. This interstratification hybrid electrode not only provides an enlarged interlayer spacing and a three-dimensional interconnected conductive network to accelerate the K+ transport rates, but also has good tolerance to volume changes caused by phase transformations during the fast potassiation/depotassiation process. DFT calculations further confirm that potassium affinities and diffusion kinetics are significantly enhanced in the BPE@V2CTx hybrid anode, particularly in BPE@V2CF2. As a result, the hybrid anode possesses a remarkable synergetic effect and achieves a high reversible capacity of 593.6 mA h g−1 at 0.1 A g−1 and excellent cycling stability of 485/261 mA h g−1 with 91/86% capacity retention after 3000 cycles at 0.2/2.0 A g−1. This work opens a new way for the application of self-assembled hybrid electrodes in energy storage, electrocatalysis and sensors.
研究领域:
材料科学
·
能源存储
·
计算化学
✓ 已验证
DOI
高影响因子
ACS Applied Energy Materials
·
2021
·
IF 6.024
Xian Lu,Wei-Lin Lin,Yue-E Huang,Jia-Xiang Zhang,Lun-Hui Guan,Xiao-Ying Huang,Ke-Zhao Du,Xiao-Hui Wu
A strategy is developed to fabricate NiO-reduced graphene oxide (rGO) layer-modified nickel foam (M-NF) as a current collector. Red phosphorous (RP) nanoparticles embedded in rGO nanosheets (P-rGO) are loaded on the M-NF (P-rGO@M-NF) as a superior anode for high-performance potassium-ion batteries. The binder-free P-rGO@M-NF anode exhibits a remarkable electrochemical performance with outstanding cycling stability and high rate capability, delivering a specific capacity of 361.2 mA h g–1 at a current density of 100 mA g–1 after 125 cycles. Theoretical calculations reveal that RP loaded on NiO can absorb K atoms easily and exhibit a semiconductor-to-metal transition after the incorporation of K atoms, exhibiting the significantly enhanced conductivity. In addition, a NiO layer can efficiently anchor RP nanoparticles by a strong Ni–O–P bond, which can endow P-rGO@M-NF a long-term lifespan. Thus, the excellent potassium storage performance of P-rGO@M-NF can be attributed to synergistic effects between modified nickel foam and P-rGO network. This present strategy to modify the current collector for anchoring alloy-type RP can be extended to other novel electrodes for high-performance energy-storage devices.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
ENERGY & FUELS
·
2023
·
IF 5.3
Yuqing Gao,Xiaobo Chen,Xing Zhao,Lin Lan,Jun Zhang,Yao Cheng,Qiang Ru
A facile fabricating tactic of high-energy ball milling coupled with cold quenching is adopted to design an amorphous Se4P4/graphene (Se4P4/G) hybrid anode for potassium ion batteries (PIBs). Benefiting from the promoted electron transfer and effective volume constraint caused by the graphene matrix, the novel Se4P4/G anode realized a prominent K-storage and long-time durability, such as a high initial capacity of 931.23/870.3 mAh g–1 at 50 mAh g–1, and sustainable capacity of 296.67/293.33 mAh g–1 at 1 A g–1 for 1800 cycles. DFT theoretical calculation revealed that the Se4P4/G interface could facilitate the electron transfer and reduce the band gap, which boosted the potassium storage. The Se4P4/G with high efficient storage and long-term durability would be one of the attractive anode materials for PIBs, and ongoing efforts are currently directed to commercialize scientific research, which provides a new idea to yield the high-power potassium phosphide for PIBs in the future.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2020
·
IF 2.369
Yuhua Niu,Xingxing Han,Liangxian Huang,Jie Song
A novel degradable interpenetrating network hydrogel based on poly(vinyl alcohol) (PVA), potassium humate (KHA), and guar gum (GG) was successfully prepared via aqueous solution polymerization for the efficient adsorption and removal of methylene blue (MB) dye and Pb(II). The PVA/KHA/GG adsorbent was characterized using Fourier transform infrared (FT-IR) spectroscopy, X-ray diffraction, thermogravimetric analysis, zeta analysis, and scanning electron microscopy. Adsorption kinetics, pseudo-second-order equations, and activation energy (Ea) calculations illustrated that there was physisorption and chemisorption of both MB and Pb(II). Moreover, batch adsorption results were best suited to the Langmuir model; the maximum adsorption capacity (qm) for MB and Pb(II) at optimum conditions was 1166.73 and 625.21 mg/g, respectively. The results of thermodynamic analysis demonstrated that the adsorption of MB and Pb(II) onto PVA/KHA/GG was an endothermic and spontaneous process, driven by an increase in entropy. Furthermore, both FT-IR and X-ray photoelectron spectroscopy studies confirmed that the possible mechanism by which Pb(II) was removed mainly occurred via chemisorption of the anionic groups, whereas the adsorption of MB took place via physisorption through H-bonding, electrostatic interactions, and π–π stacking. Note that the adsorbent can be readily regenerated and efficiently reused for several cycles.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）