CERAMICS INTERNATIONAL
·
2024
·Vol. 50
·期 24
·52228-52239
·
IF 5.1
Dongjiang Wu,Weijie Lv,Zheng Li,Xuexin Yu,Cong Zhou,Bi Zhang,Wei Wang,Huanyue Zhang,Guangyi Ma,Fangyong Niu
High-entropy oxides (HEOs) have attracted extensive research interest due to their unique structural features, customizable elemental compositions, and tunable functional properties. Nevertheless, the complexity, low efficiency, and high cost of the existing HEO synthesis methods place limitations on them. In this study, Laser directed energy deposition (LDED) was employed to synthesize (Mg, Co, Ni, Cu, Zn)O oxides. Additionally, the novelty of applying the LDED process to multicationic systems was emphasized. The comparison between specimens fabricated from mixed powder via LDED(MP) and those fabricated from pre-sintered powder via LDED(SP) encompasses macroscopic morphology, microstructure, and performance. The results showed that SP significantly enhanced the density from 86.44 % to 96.70 % compared to MP. The macro-segregation of Cu and Cu 2 O in the phase composition was observed in MP and SP. High-temperature pre-sintering promoted the solid solution formation of Co and Ni during LDED, leading to more severe micro-segregation of Co and Ni. When employed as anodes in lithium-ion batteries, MP and SP have outstanding long-term cycle stability, according to electrochemical performance studies. At a current density of 100 mAg −1 , these specimens maintained a capacity retention rate of 100 % even after 200 cycles. The initial discharge capacities of MP and SP were respectively 477.73 mAh g −1 and 373.86 mAh g −1 . This study is expected to present a novel approach for the rapid synthesis of (Mg, Co, Ni, Cu, Zn)O oxide ceramics .
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DOI
高影响因子
Journal of Energy Chemistry
·
2022
·
IF 13.599
Shu Yang,Guanjie Li,Xiaoyan Lin,Changyong Mo,Xianggui Zhou,Lijiao Quan,Kuan Zhou,Suli Li,Hai Wang,Weishan Li
Lithium-metal battery based on Ni-rich cathode provides high energy density but presents poor cyclic stability due to the unstable electrode/electrolyte interfaces on both cathode and anode. In this work, we report a new strategy to address this issue. It is found that the cyclic stability of Ni-rich/Li battery can be significantly improved by using succinic anhydride (SA) as an electrolyte additive . Specifically, the capacity retention of LiNi 0.8 Co 0.1 Mn 0.1 O 2 (NCM811)/Li cell is improved from 14% to 83% after 200 cycles at 1 C between 3.0 and 4.35 V by applying 5% SA. The underlying mechanism of SA contribution is understood by comparing the effects of malic anhydride (MA) and citraconic anhydride (CA), both of which share a similar molecular structure to SA but show different effects. On anode side, SA can but MA and CA cannot form a protective solid electrolyte interphase (SEI) on Li anode. On cathode side, three anhydrides can suppress the formation of hydrogen fluoride from electrolyte oxidation decomposition, but SA behaves best. Typically, MA shows adverse effects on the interface stability of Li anode and NCM811cathode, which originates from its high acidity. Though the acidity of MA can be mitigated by substituting a methyl for one H atom at its C C bond, the substituent CA cannot compete with SA in cyclic stability improvement of the cell, because the SEI resulting from CA is not as robust as that from SA, which is related to the binding energy of the SEI components. This understanding reveals the importance of the electrolyte acidity on the Ni-rich cathode and the robustness of the SEI on Li anode, which is helpful for rationally designing new electrolyte additives to further improve the cyclic stability of high-energy-density Ni-rich/Li batteries.
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高影响因子
ELECTROCHIMICA ACTA
·
2012
·
IF 3.832
Huihui Wang,Shilin Zhou,Zhigang Wang,Shanling Xu,Song Dong,Yuqing Miao
Electrochemical conversion of metal hexacyanoferrates into their oxides or hydroxides was successfully achieved and reported using nickel hexacyanoferrates (Ni-HCF). Herein, a versatile strategy for such a conversion was explored by potential cycling Ni(OH) 2 nanoparticle film modified electrodes in K 3 [Fe(CN) 6 ] or K 4 [Fe(CN) 6 ] solution. The results show that K 3 [Fe(CN) 6 ] is more prone to the conversion from Ni(OH) 2 to Ni-HCF. Their composition , morphology, and structure were characterized by the techniques such as scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR) and UV–vis spectrometry . The reaction mechanism is tentatively given. This strategy is also suitable for the other metal hydroxides including rare earth hydroxides such as neodymium, samarium etc.
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高影响因子
IONICS
·
2019
·Vol. 26
·期 2
·627-637
·
IF 2.289
Zhai Huanhuan,Shuai Yi,Wang Yu,Chen Kanghua
As a negative electrode material, the main drawbacks of Li 4 Ti 5 O 12 (LTO) are its low electric conductivity and poor Li-ion diffusion coefficient. Fortunately, elements modification to address these problems is an effective method. Herein, we firstly report Ni and F co-modified LTO material which is synthesized via a solid-state reaction. Powder X-ray diffraction, scanning electron microscopy, and X-ray photoelectron spectroscopy were conducted to investigate the structure and morphology. Afterwards, we surprisingly find that Ni and F co-modification can reduce the overall charge transfer resistance of LTO for part of Ti 4+ converts into Ti 3+ and Ni 2+ ions supply the charge carriers. When test in battery, a superior discharge capacity of 236.1 mAh g −1 at 0.036 A g −1 is obtained, much higher than that of pristine LTO (196.9 mAh g −1 ). Furthermore, it still retains a discharge capacity of 174.6 mAh g −1 after 200 cycles at 0.18 A g −1 and exhibits an excellent rate performance.
研究领域:
材料科学
·
电化学
·
能源存储
·
无机化学
·
固体化学
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DOI
高影响因子
Journal of Materials Chemistry A
·
2018
·Vol. 6
·期 24
·11370-11376
·
IF 9.931
Qinglong Fu,Pan Yang,Jingchuan Wang,Hefang Wang,Lijun Yang,Xiaochong Zhao
Simple, safe and economic methods to prepare Ni nanofibers are required for their practical application. Herein, an in situ vacuum thermal reduction strategy is proposed to synthesize Ni nanofibers on a large scale, which involves electrospinning of a nickel acetate/polyvinylpolypyrrolidone/ethyl cellulose (NiAc/PVP/EC) precursor solution, followed by vacuum thermal treatment. Characterization of the morphology and microstructure reveals that the as-prepared Ni nanofibers are composed of nano-size Ni grains and possess a large surface area. Moreover, it has been demonstrated that the content of EC is closely related to the size of Ni grains and thus the surface area of Ni nanofibers. On account of their high specific surface area, the as-prepared Ni nanofibers exhibit efficient catalytic properties for H2 generation from hydrous hydrazine in an alkaline solution.
研究领域:
材料科学
·
纳米技术
·
催化化学
·
能源材料
·
物理化学
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DOI
高影响因子
JOURNAL OF SUPERCRITICAL FLUIDS
·
2022
·
IF 4.514
Jianqiao Yang,Jiyuan Sun,Shuyuan Bai,Hao Wu,Shuzhong Wang,Yanhui Li,Wenhao Ma,Donghai Xu
To improve the corrosion resistance of component materials in supercritical water oxidation (SCWO) environment, a 15 µm Cr coating was prepared on Alloy 625 by magnetron sputtering, and the effect of oxygen concentration (0 M, 0.16 M, and 0.94 M) on the stability of the Cr coating in an SCW environment was investigated. Results show that the stability of the Cr 2 O 3 layer strongly depends on the oxygen concentration in the exposure environment. The protective Cr 2 O 3 layer was transformed to soluble Cr(VI) species and dissolved in SCW containing 0.94 M oxygen. Except for Cr 2 O 3 , some Fe/Ni containing oxides were also detected. The stability of the Cr coating in SCW with different concentrations of oxygen is discussed.
研究领域:
材料科学
·
腐蚀与防护
·
表面工程
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能源环境工程
·
高温化学
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DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2019
·Vol. 45
·期 3
·1466-1476
·
IF 4.084
Yuelong Xu,Xiaoxi Dong,Junfeng Miao,Shasha Wang,Zhan Liu,Zuozhao Zhai,Lihui Zhang,Zhenfa Liu
Carbon nanomaterials that are electrochemically bifunctional and active in supercapacitor and hydrogen-evolution-reaction (HER) applications have attracted recent research attention. We have prepared porous carbon spheres - doped Ni, Co - alloys by using a hydrothermal method with melamine and pectin as precursors and with the addition of nickel nitrate and cobalt nitrate. The corresponding materials exhibit good electrochemical performance and excellent electrocatalytic activity for HER. The overpotential (OP) of the as-prepared materials can achieve 240 mV keeping a Tafel slope (TS) of 55 mV dec −1 at 10 mA cm −2 in an acid (0.5 M H 2 SO 4 ) solution. The corresponding samples maintain stability after 24 h and 5000 cycles in the chronovoltage and cyclic voltammetry methods, respectively. When the as-prepared materials are oxidized by 30% H 2 O 2 for 12 h, the corresponding as-prepared oxidation samples exhibit excellent electrochemical performance in a supercapacitor application. The specific capacitance (SC) of the as-obtained materials reaches 312 F g −1 at 1 A g −1 with decent rate capability and cyclic stability. This work provides new applications for bifunctional electrochemically active materials.
研究领域:
材料科学
·
电化学
·
纳米材料
·
能源存储
·
催化化学
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Zhaoze Fan,Jiayuan Xiang,Qiong Yu,Xianzhang Wu,Min Li,Xiuli Wang,Xinhui Xia,Jiangping Tu
Sulfide-based all-solid-state lithium batteries (ASSLBs) assembled with Ni-rich layered cathodes are currently promising candidates for achieving high-energy-density and high-safety energy storage systems. However, the interfacial challenges between sulfide electrolyte and Ni-rich layered cathode, such as space charge layer, side reaction, and poor physical contact, greatly limit the practicality of all-solid-state batteries. In this work, an optimal crystalline Li0.35La0.55TiO3 (LLTO) surface coating with a thickness of roughly 6 nm and a high Li ion conductivity of 0.3 mS cm–1 was adopted to enhance the structural stability of the single-crystal LiNi0.6Co0.2Mn0.2O2 (S-NCM622) cathode in ASSLBs. Furthermore, due to the high ionic conductivity and chemical stability of the LLTO coating layer, the interfacial problems, involving interfacial reaction and a space charge layer, in sulfide-based all-solid-state batteries have been effectively solved. As a result, the assembled ASSLBs with the S-NCM622@LLTO cathode exhibit high initial capacity (179.7 mAh g–1) at 0.05 C and excellent cycling performance with 84.5% capacity retention after 100 cycles at 0.1 C at room temperature. This work proposes an effective strategy to enhance the performance of Ni-rich layered cathodes for next-generation high-energy-density sulfide-based lithium batteries.
研究领域:
材料科学
·
电化学
·
储能技术
·
锂电池
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DOI
高影响因子
ACS Applied Energy Materials
·
2019
·
IF 0
Yao Xiao,Wei Wei,Meijiao Zhang,Sa Jiao,Yuchuan Shi,Shujiang Ding
Metal–organic frameworks (MOFs) have emerged as one class of the most promising electrode materials for supercapacitors because of their high surface area and tunable pore structures. The development of MOF heterostructures based on high-quality graphene (HQG) which aims at superior capacitive properties while overcoming poor solution processability and reactivity of HQG is of great concern. In this work, a heterolayered MOF composite was prepared by a facile glucose modification of HQG and controlled nucleation and growth of lamellar Ni-MOF on the HQG surface. The introduction of oxygen-containing functionalities in our approach not only improves the interfacial interactions to form two-dimensional heterostructures but also enhanced the synergistic effects between Ni-MOF and HQG substrates. The constructed GM-LEG@Ni-MOF exhibits excellent capacitance of 987.6 F g–1 at the current density of 0.5 A g–1 and a high capacity retention (85.6%) after 3000 cycles, owing to its favorable electrochemical kinetics and highly structural stability.
研究领域:
材料科学
·
电化学
·
纳米技术
·
储能
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DOI
CERAMICS INTERNATIONAL
·
2026
·
IF 5.6
Chenhao Zhu,Liyang Lin,Benrun Shi,Yu He,Shuo Gao,Yan Wang,Tingbo Wang
Most studies on Mn-based NTC thermistors have been limited to fixed or narrow Ni/Co ratios, lacking a systematic investigation of the full compositional range. This gap impedes the rational and precise design of high-performance thermistors. Here, we prepared Co x Ni 1-x Mn 2 O 4 (x = 0, 0.25, 0.5, 0.75, 1) series thermistors via solid-state reaction, achieving single-phase spinel structures across all compositions. The grain size of Co x Ni 1-x Mn 2 O 4 dropped sharply when the Co content reached 0.5, then increased slightly as x was raised further to 1. The Co 0.25 Ni 0.75 Mn 2 O 4 (x = 0.25) thermistor exhibited the lowest resistivity (1.42 kΩ at 25 °C), while Co 0.75 Ni 0.25 Mn 2 O 4 (x = 0.75) delivered optimal comprehensive performance, combining low resistivity (4.16 kΩ) with high sensitivity (B 25-50 = 3.38 × 10 3 K). When the Co content reached the maximum (x = 1), the thermistor exhibited the highest B 25-50 (up to 3.96 × 10 3 K), corresponding to the optimal sensitivity in the temperature measurement range. The resistivity of Mn-Co-Ni based thermistors is mainly determined by the concentration of Mn 3+ /Mn 4+ ion pairs (especially Mn 3+ ) and additionally modulated by the grain size (grain boundary resistance), which establishes a clear structure-performance correlation for the system. This work provides technical references for developing high-performance, precisely designable Mn-based thermistors and lays a foundation for rational Ni/Co ratio regulation in similar spinel NTC systems.
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产品关联
DOI
高影响因子
NEW CARBON MATERIALS
·
2026
·Vol. 40
·期 6
·1292-1303
·
IF 6.8
Zong-da TIAN,He-feng YUAN,Zi-zai MA,Yong-feng LI,Xiao-guang WANG
Nickel nanoparticles (Ni NPs) encapsulated in carbon shells have shown promise in the electrochemical reduction of CO 2 to CO. The electronic regulation of the interface between Ni NPs and carbon shells plays a crucial role in reducing the energy barrier of the CO reaction path. We report the formation of a catalyst with hierarchical porosity (Ni NPs@NC) using a high-surface-area 3D Ni-MOF as the precursor. By correlating the pyrolysis temperature with structural changes and catalytic efficiency, structure-activity relationships were established. Because of the confined encapsulation of the Ni NPs by the N-doped carbon layer, the framework does not collapse during pyrolysis but also produces a high-density of exposed Ni-N active sites and better mass transport paths. Notably, the Ni NPs@NC-800 sample had an outstanding electrocatalytic performance for CO 2 reduction, achieving a maximum Faradaic Efficiency (FE) of 93% at −0.8 V vs RHE, and maintaining over 90% efficiency even after 48 h of continuous operation. Raman spectroscopy showed that the interface between the Ni NPs and the carbon shell play a critical role in stabilizing the critical COOH intermediate, promoting CO desorption and inhibiting the competing hydrogen evolution reaction. This work may provide insight for producing catalysts for efficient electrochemical CO 2 reduction over a wide potential range. Download: Download high-res image (53KB) Download: Download full-size image
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产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2026
·
IF 9.2
Qingyuan Song,Jinshou Yao,Liujun Jin,Peiyang Gu,Ye Wang,Ping Liu,Congping Chen,Guohong Dai
Dibutyl phthalate (DBP), a ubiquitous plasticizer pollutant, poses severe risks to environmental and human health, yet its high chemical stability makes valorization highly challenging. Herein, we report a one-pot, mild, and green strategy that directly upcycles DBP as an organic ligand to construct a ferroferric oxide functional Ni-based MOF framework nanocomposite (Fe3O4-Ni-MOF(DBP)) on nickel foam (NF), enabling the simultaneous detoxification of DBP and fabrication of a high-performance electrocatalyst. The in-situ integration of Fe3O4 nanoparticles with the Ni-MOF(DBP) endows the hybrid catalyst with accelerated charge-transfer kinetics, enhanced electrical conductivity, and abundant accessible active sites, leading to remarkable bifunctional activity for overall water splitting. In an alkaline electrolyte, Fe3O4-Ni-MOF(DBP)/NF exhibits outstanding bifunctional electrocatalytic performance, delivering low overpotentials of 233 mV for the OER and 42 mV for the HER at 10 mA cm -2 , along with excellent durability over continuous operation exceeding 40 h. In-situ Raman analysis reveals that the superior catalytic performance of Fe3O4-Ni-MOF(DBP)/NF is attributed to the dynamic reconstruction of surface metal sites into active (oxy)hydroxide intermediates. This work presents an innovative strategy for the valorization of toxic plastic pollutants, thus advancing the cross integration of environmental remediation and clean energy technologies.
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）