Small Methods
·
2023
·
IF 12.4
Xuejun Zhou,Guyue Li,Yifan Yu,Meng Lei,Keyi Chen,Chilin Li
Magnesium metal batteries (MMBs) currently face challenges suffering from severe Mg metal passivation and extremely high overpotential in conventional electrolytes. Herein, a strategy of using a low-cost deep eutectic solution (DES) is proposed to modify Mg anode with the monolithic and compact coating of a MgCl 2 -Al-MgCl 2 sandwich structure, enabling the stable and reversible Mg plating–stripping behavior. An organic/nanocrystal hybrid interphase is in-situ built through a facile Mg-Al displacement reaction between aluminum-chloro clusters and Mg in AlCl 3 /Et 3 NHCl solution, and it can effectively minimize the adverse interfacial passivation reaction and surface diffusion barrier, affording the high ion-conduction and electronic insulation. This DES-assisted method guarantees a highly reversible cycling of Mg metal anode (over 5000 h at 0.1 mA cm −2 and 400 h at 2.0 mAh cm −2 ) in Mg(TFSI) 2 /DME electrolyte with the improved interfacial kinetics and low overpotential. Even at a much higher current density of 1 mA cm −2 , the overpotential only undergoes a slight increase from 0.2 V (at 0.1 mA cm −2 ) to 0.23 V. The corresponding full cells with CuS and phenanthraquinone cathodes deliver satisfactory cyclic performance. The DES modification strategy provides a new solution to the design of robust and conductive solid electrolyte interphase for achieving high-voltage and durable MMBs.
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JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2021
·
IF 6.789
Ziyi Shen,Jie Jin,Jingjing Fu,Meng Yang,Feihu Li
The co-occurrence of arsenic and fluoride in the water environment has led to many health concerns for living beings. Simultaneous removal of such ions is crucial to the safety of water resources , and biochar has been extensively engaged to address this issue. Here four magnetic biochars (mBCs) including pristine magnetic biochar and three aluminum (Al) and/or magnesium (Mg) oxides-anchored magnetic biochar (i.e., Al-mBC, Mg-mBC, and MgAl-mBC) were prepared via a facile pyrolysis method and then comprehensively evaluated as adsorbents for enhanced co-uptake of arsenate (As V ) and fluoride (F − ) from synthetic water. The mBC shows a high specific surface area of 205 m 2 g −1 , which dropped to 116, 80, and 114 m 2 g −1 upon the anchoring of Al, Mg, and Mg + Al, respectively. Our results suggest that the adsorption of either As V or F − is highly pH-dependent, and pH 4–6 is the optimal range for maximum adsorption. The adsorption isotherm data indicate that the MgAl-mBC adsorbent outranks all other mBCs for co-uptake of both As V and F − . The adsorption capacity maxima of MgAl-mBC are 34.45, and 21.59 mg g −1 for As V and F − , respectively (pH = 5, T = 10 °C), also highly outstripping other biochars reported in the literature. The magnetic feature of these mBCs enables us to fast reclaim and regenerate the exhausted adsorbents by an external magnet and dilute NaOH. The Al- and Mg-anchored mBCs are expected to be used as highly efficient adsorbents for environmental remediation of waters contaminated by both As V and F − .
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Xuancheng Wang,Xuezhang Xiao,Jiaguang Zheng,Zhouming Hang,Wenping Lin,Zhendong Yao,Meng Zhang,Lixin Chen
Magnesium borohydride , Mg(BH 4 ) 2 , is ball-milled with Ti nano-particles. Such catalyzed Mg(BH 4 ) 2 releases more hydrogen than pristine Mg(BH 4 ) 2 does during isothermal dehydrogenation at 270, 280, and 290 °C. The catalyzed Mg(BH 4 ) 2 also exhibits better dehydrogenation kinetics than the pristine Mg(BH 4 ) 2 . Based on kinetics model fitting, the activation energy ( E a ) of the catalyzed Mg(BH 4 ) 2 is calculated to be lower than pristine Mg(BH 4 ) 2 . During partial dehydrogenation , the catalyzed Mg(BH 4 ) 2 releases 4.23 wt % (wt%) H 2 for the second dehydrogenation at 270 °C, comparing to 4.05, and 3.75 wt% H 2 at 280, and 290 °C. The reversibility of 4.23 wt% capacity is also one of the highest for Mg(BH 4 ) 2 dehydrogenation under mild conditions such as 270 °C as reported. 4 cycles of Mg(BH 4 ) 2 dehydrogenation are conducted at 270 °C. The capacities degrade during 4 cycles and tend to be stable at about 3.0 wt% for the last two cycles. By analyzing the hydrogen de/absorption products of the catalyzed sample, Mg(BH 4 ) 2 is found to be regenerated after rehydrogenation according to Fourier Transform Infrared (FTIR) spectroscopy. Ti nano-particles can react with Mg(BH 4 ) 2 during ball-milling and de/rehydrogenation. The products include TiH 1.924 , TiB, and TiB 2 , which can improve the dehydrogenation properties of Mg(BH 4 ) 2 from a multiple aspect.
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Jiaguang Zheng,Xuancheng Wang,Xuezhang Xiao,Hao Cheng,Liuting Zhang,Lixin Chen
Two dual-cation transition metal fluorides K 2 TiF 6 and K 2 NbF 7 are introduced into Mg(BH 4 ) 2 by ball-milling to catalyze the dehydrogenation of Mg(BH 4 ) 2 . According to the DSC and TPD results, the onset dehydrogenation temperature of Mg(BH 4 ) 2 doped with K 2 TiF 6 and K 2 NbF 7 are remarkably reduced to 105.4 and 118.0 °C, respectively. Meanwhile, both the K 2 TiF 6 and K 2 NbF 7 catalyzed systems can release more than 6.4 wt% H 2 under 280 °C, showing an improvement in dehydrogenation kinetics. In addition, the reversible capacity of the Mg(BH 4 ) 2 –3%K 2 TiF 6 system is 2.7 wt% at 280 °C in 250 min, which is enhanced comparing to that of pristine Mg(BH 4 ) 2 . X-ray diffraction, Fourier-transformed infrared and 11 B nuclear magnetic resonance investigations reveal that the K 2 TiF 6 actually acts as a catalytic precursor to react with Mg(BH 4 ) 2 , forming active hydrides of KBH 4 and TiH 2 , which further serve as catalyzing agents to facilitate the re-generation of Mg(BH 4 ) 2 from intermediates under moderate conditions.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2020
·
IF 4.939
Jiaguang Zheng,Zhendong Yao,Xuezhang Xiao,Xuancheng Wang,Jiahuan He,Man Chen,Hao Cheng,Liuting Zhang,Lixin Chen
Novel porous hollow carbon nanospheres (HCNS) have been synthesized and utilized as scaffold for LiBH 4 –Mg(BH 4 ) 2 eutectic borohydride (LMBH). Large loading amounts of LMBH (33, 50 and 67 wt%) have been melt-infiltrated into HCNS, and the significantly improved dehydrogenation properties have been discovered. The LMBH@HCNS composites not only exhibit high actual dehydrogenation amounts and fast hydrogen desorption rates, but also an increased reversible hydrogen storage capacities after three cycles without obvious degradation. Further structural tests have revealed that the over-infiltrated LMBH covering the spherical surface of HCNS could also contribute to the improved hydrogen storage behaviors, due to a strong interfacial adhesion effect that avoid LMBH from aggregation during de/rehydrogenation cycles.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Xuan Luo,Luhan Wang,Meng Tian,Yi Tian,Xiao Zhang,Shijie Zhou,Jun Xie,Linlin Hu
O3-type layered oxides are considered ideal cathode materials for sodium-ion batteries (SIBs) owing to their high theoretical capacities, but these materials undergo complex phase transitions during the Na + extraction and insertion, resulting in serious structural degradation and reduced cycling stability. Herein, we employ “Cu/Mg co-doping strategy” to synthesize a stable O3-type layered transition metal oxide NaNi 0.25 Cu 0.1 Mg 0.05 Fe 0.2 Mn 0.4 O 2 (NaNCMFMO) with excellent structural reversibility. The resulting NaNCMFMO achieves reversible specific capacity of 123 mAh g −1 at 0.1 C and remarkable improvement in capacity retention of 79.4 % over 300 cycles at 1.0 C, compared to the pristine NaNi 0.4 Fe 0.2 Mn 0.4 O 2 cathode (42.1 % retention after 300 cycles). Additionally, ex situ X-ray diffraction pattern of NaNCMFMO indicates a highly reversible phase evolution of O3-P3-O3 during charge/discharge cycles, and GITT measurements reveal faster Na + diffusion kinetics. Moreover, a NaNCMFMO//hard carbon full-cell battery exhibits superior electrochemical performance: a high reversible specific capacity of 105.1 mAh g −1 at 1.0 C and capacity retention of 81.1 % over 200 cycles. This work presents a facile and effective strategy to suppress structural degradation in O3-type layered cathodes materials of high-performance SIBs.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Tao Li,Weikun Sun,Jian Zhang,Shengqin Liu,Hongbin Chen,Zumin Qiu,Jason Chun-Ho Lam
Herein, an efficient and stable catalyst of Co 3 O 4 @LDH-AC was innovatively prepared through uniform loading of an activated carbon substrate with Mg/Al layered double hydroxide (Mg/Al-LDH) followed by dispersing Co 3 O 4 nanoparticles in the confined space of LDH. This unique flower-like spherical structure significantly improved the adsorption capacity and would increase the concentration of reactants in the confined space. Experimental results showed that levofloxacin (LFX) completely degraded in 4 min with the addition of µM peroxymonosulfate (PMS). The fast conversion of Co 2+ and Co 3+ in catalyst for the generation of highly reactive species is revealed via EPR, in-situ Raman, in-situ FT-IR, and XPS. Further tests of 5Co 3 O 4 @LDH-AC in effluent of hospital wastewater treatment showed that it not only possessed strong anti-interference capabilities, but also maintained stable catalytic activity in fixed-bed reactor for a long operation time. Therefore, the excellent catalytic performance in confined space offers the possibility of application for the degradation of micropollutants in real pharmaceutical wastewater discharged from hospital (800–1200 tons/day, COD > 150 mg/L).
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Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 27
·13950-13956
·
IF 8.867
Yanan Xu,Chang Xu,Qinyou An,Qiulong Wei,Jinzhi Sheng,Fangyu Xiong,Cunyuan Pei,Liqiang Mai
Novel NASICON-type carbon-coated LiTi2(PO4)3 microflowers (LTP-F/C) as a hybrid magnesium–lithium-ion battery (MLIB) cathode is presented for the first time. Benefiting from the synergistic effect of the NASICON structure, nanosheet-constructed hierarchical architecture, and uniform carbon coating of LTP-F/C, this hybrid MLIB exhibits extraordinary electrochemical performance: ultra-high cycling stability (capacity retention of 80% after 3000 cycles at 10 C) and outstanding rate capability (94 mA h g−1 at 20 C) under a high discharge voltage plateau of ∼1.71 V (vs. Mg/Mg2+). This hybrid battery system design is highly promising for large-scale energy storage applications.
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CARBOHYDRATE POLYMERS
·
2019
·
IF 6.044
Lilong Zhang,Keli Chen,Liang He
A strategy to realize a reinforced photothermal stability cellulose nanofibrils (CNFs) films was reported. The LDHs were dispersed homogeneously onto the active site of CNFs surface by electrostatic self-assembly and the Mg/Al LDHs armour-type nanofibrils were prepared. After simple vacuum filtration, this kind nanofibrils can fabricate highly ordered multilayer film. Suitable amount of additive can bring outstanding photo-thermal property. The visible-light transmittance of the composite films can reach to c.a 80.0% when addition was 0.1% wt. and folding strength of the films contained 0.5% wt LDHs can increased by 15 times. The strength and the light transmittancevery of composite films was also higher than the pure nanocellulose film with the photothermal radiometry for about 30 h under 60 °C drying condition. The production is simple and highly repeatable process could be a good reference for preparation of high photothermal stability and transparent CNFs-based thin films.
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PubMed
高影响因子
ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE
·
2017
·Vol. 643
·期 16
·1082-1087
·
IF 1.144
Chen Shen,Dajiang Mei,Chuanling Sun,Yunsheng Liu,Yuandong Wu
The selenites, Na 2 Be 3 (SeO 3 ) 4 · H 2 O and Cs 2 [Mg(H 2 O) 6 ] 3 (SeO 3 ) 4 , were synthesized under hydrothermal conditions. The crystal structures of Na 2 Be 3 (SeO 3 ) 4 · H 2 O and Cs 2 [Mg(H 2 O) 6 ] 3 (SeO 3 ) 4 were determined by single-crystal X-ray diffractions. Na 2 Be 3 (SeO 3 ) 4 · H 2 O crystallizes in the triclinic space group P 1 (no. 2) with unit cell parameters a = 4.8493(9), b = 12.013(2), c = 12.077(2) Å, and Z = 2, whereas Cs 2 [Mg(H 2 O) 6 ] 3 (SeO 3 ) 4 crystallizes in the monoclinic space group C 2/ m (no. 12) with lattice cell parameters a = 12.596(6), b = 7.297(4), c = 16.914(8) Å, and Z = 2. Na 2 Be 3 (SeO 3 ) 4 · H 2 O features a three-dimensional open framework structure formed by BeO 4 tetrahedra and SeO 3 trigonal pyramids. Na cations and H 2 O molecules are located in different tunnels. Cs 2 [Mg(H 2 O) 6 ] 3 (SeO 3 ) 4 has a structure composed of isolated [Mg(H 2 O) 6 ] octahedra and SeO 3 trigonal pyramids interacted by hydrogen bonds, and Cs cations are resided in-between. Both compounds were characterized by thermogravimetric analysis and FT-IR spectroscopy.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Wenlin Zhang,Di Jiao,Lu-Hua Zhang,Fengshou Yu
Iron phthalocyanine (FePc) is a promising non-noble metal catalyst for oxygen reduction reaction (ORR). While, with the plane-symmetric FeN 4 site, the ORR activity of FePc is generally low due to its low ability to adsorb and activate O 2 . Herein, we anchor FePc on Mg(OH) 2 / N -doped carbon nanosheets building the ternary plate-like catalyst FePc/Mg(OH) 2 /NC. Theoretical and experimental results show that due to the formation of FePc/Mg(OH) 2 heterojunction, the electron spin state of the monodisperse iron active site ranges from medium spin (MS, t 2g 5 e g 1 ) to low spin (LS, t 2g 6 e g 0 ), enhancing the adsorption with oxygen-containing intermediates, thereby improving the dynamics of the oxygen reduction reaction. As a result, FePc/Mg(OH) 2 /NC catalyst exhibits an outstanding performance (E 0 = 1.02 V, E 1/2 = 0.91 V) for ORR, superior to the commercial Pt/C electrode (E 0 = 1.01 V, E 1/2 = 0.85 V) and FePc/NC (E 0 = 0.97 V, E 1/2 = 0.87 V) under the alkaline conditions. This work offers a new way for the rational design of effective Fe N C catalysts with the support of metal oxides/hydroxides.
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PubMed
高影响因子
BIOELECTROCHEMISTRY
·
2018
·
IF 3.789
Qiang Yuan,Y. Huang,Debao Liu,Minfang Chen
Biodegradable beta-tricalcium phosphate (β-TCP) particle reinforced magnesium metal matrix composites (Mg-MMC) have attracted increasing interest for application as implant materials . This investigation was conducted to study the effect of cooling rate on the microstructure and corrosion behavior of a biodegradable β-TCP/Mg-Zn-Ca composite. The composite was fabricated under a series of cooling rates using a wedge-shaped casting mold. The microstructure of the composite was examined by optical and scanning electron microscopy, and the corrosion behavior was investigated using an electrochemical workstation and immersion tests in a simulated body fluid (SBF). Faster cooling rates were shown to refine the secondary phase and grain size, and produce a more homogenous microstructure. The refined microstructure resulted in a more uniform distribution of β-TCP particles, which is believed to be beneficial in the formation of a stable and compact corrosion product layer, leading to improved corrosion resistance for the composite.
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