INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2019
·
IF 4.084
Yongqing Wang,Zhiqiang Lan,Xiantun Huang,Haizhen Liu,Jin Guo
Using a deposition-reduction method, Mg/MOF nanocomposites were prepared as composites of Mg and metal-organic framework materials (MOFs = ZIF-8, ZIF-67 and MOF-74). The addition of MOFs can enhance the hydrogen storage properties of Mg. For example, within 5000 s, 0.6 wt%, 1.2 wt%, 2.7 wt%, 3.7 wt% of hydrogen were released from Mg, Mg/MOF-74, Mg/ZIF-8, Mg/ZIF-67, respectively. Activation energy values of 198.9 kJ mol −1 H 2 , 161.7 kJ mol −1 H 2 , 192.1 kJ mol −1 H 2 were determined for the Mg/ZIF-8, Mg/ZIF-67, Mg/MOF-74 hydrides, which are 6 kJ mol −1 H 2 , 43.2 kJ mol −1 H 2 , and 12.8 kJ mol −1 H 2 lower than that of Mg hydride, respectively. Moreover, the cyclic stability characterizing Mg hydride was significantly improved when adding ZIF-67. The hydrogen storage capacity of the Mg/ZIF-67 nanocomposite remained unchanged, even after 100 cycles of hydrogenation/dehydrogenation. This excellent cyclic stability may have resulted from the core-shell structure of the Mg/ZIF-67 nanocomposite.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Zeyu Yuan,Junming Cao,Shulga Valerii,Hao Xu,Lili Wang,Wei Han
Sodium-ion batteries, as a promising alternative to the lithium-ion battery, have attracted extensive attention. However, due to the larger ion radius and higher standard reduction potential, the sodium-ion batteries still face poor cycle stability and relatively low energy density problems. In this work, a carbon sphere-supported Nb 2 CT x MXene/MoS 2 hierarchical structure has been designed and synthesized through hydrothermal and electrostatic self-assembly methods. The design strategy successfully improves the utilization efficiency of the MoS 2 carbon sphere as a support skeleton and reducing the diffusion path length of Na ions, leading to an improved specific capacity and rate performance. Moreover, Nb 2 CT x sheets also effectively inhibit the capacity attenuation caused by MoS 2 shedding, thus achieving the long cycle life of the sodium-ion battery. As a result, the carbon-supported MXene/MoS 2 anode delivers an ultrahigh reversible capacity, long cycling stability, and superior capacity retention rate. Notably, the carbon-supported MXene/MoS 2 anode can also obtain a considerable capacity of 196 mAh g −1 at a current density of 20 A g −1 . The full cell of SIBs was assembled, and the flexibility of the battery was tested. The density functional theory simulation results show that the sodium ion has a smaller diffusion barrier under this material design strategy.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CARBON
·
2025
·
IF 11.6
Han Yang,Chenxu Yang,Yibo Zhang,Qi Li,Jun Zhang,Ziyang Lu,Yue Chu,Quan-Hong Yang,Ying Tao
Defects in hard carbon are primarily associated with the slope capacity arising from sodium ion adsorption on defect sites for sodium storage. However, the impact of defects on plateau sodium storage remains poorly understood owing to the difficulties for hard carbon in precisely customizing carbon defects in the walls of closed pores without changing other structures such as pore geometry. Here, sieving carbon is selected as a model material to study the role of defects within closed pores in plateau sodium storage, considering that its pore forming and pore sealing by chemical vapor deposition are decoupled during material preparation. Specifically, vacancy-dominated defects are formed within closed pores by hydrogen reduction of porous carbon precursor and an identical external surface with deposited carbon covered is obtained by chemical vapor deposition. Such a vacancy-rich sieving carbon exhibits a high specific capacity of 470 mAh g −1 , along with an increased plateau capacity and improved cycling stability, remaining 72.3 % of its initial capacity after 400 cycles (342 mAh g −1 ). A series of spectroscopic studies demonstrate that increased carbon vacancies promote the formation of sodium clusters with higher reversibility in closed pores. This work provides new insights into the mechanism of plateau sodium storage and offers an effective strategy to improve the capacity and cycling stability of carbon anodes for sodium-ion batteries.
研究领域:
材料科学
·
电化学
·
储能技术
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2015
·
IF 4.321
Yingchao Hu,Wenqiang Liu,Jian Sun,Mingkui Li,Xinwei Yang,Yang Zhang,Minghou Xu
A novel inert solid support of Nd 2 O 3 was introduced to enhance the cyclic carbonation/calcination performance of CaO-based sorbents. CaO particles were incorporated into Nd 2 O 3 by a wet-mixing method, using three organometallic precursors (OMPs) as calcium precursors and neodymium(III) acetate hydrate as inert support precursor. For comparison, CaO-based sorbents directly produced from precursors and the naturally occurring sorbent (limestone) were also investigated. FSEM and EDAX results revealed that the ultrafine active specie of CaO particles were homogeneously dispersed into Nd 2 O 3 inert support. As a result, an improved durability and higher carbonation conversion were observed owing to the retarded sintering and the delayed diffusion controlled stage respectively for the sorbents investigated. The performance of the synthetic sorbents also relies on the precursor. When calcium dl -lactate pentahydrate (CaL) was used to incorporate CaO into the inert support Nd 2 O 3 , the highest conversion and best durability were obtained. The effect of calcination temperatures on the sorbent durability was also investigated. Under a relatively severe calcination temperature of 900 °C, a high conversion of about 67% were obtained after 100 carbonation/calcination cycles for a sorbent synthesized from calcium dl -lactate pentahydrate (CaL) and neodymium(III) acetate hydrate. When the calcination temperature was changed to a mild one of 800 °C, a significantly high conversion (>92.5%) was maintained over 100 carbonation/calcination cycles. Besides, no apparent capacity decline was observed for the sorbents after granulation.
研究领域:
化学工程
·
材料科学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2014
·Vol. 3
·期 8
·4493-4500
·
IF 0
Lina Chong,Jianxin Zou,Xiaoqin Zeng,Wenjiang Ding
In the present work, hydrogen sorption behaviors of some of the 3NaBH4–LnF3 (Ln = Ce, Sm, Gd and Yb) composites were investigated and the mechanisms associated with different effects of LnF3 (Ln = La, Ce, Pr, Nd, Sm, Gd, Ho, Er and Yb) on reversible hydrogen sorption in NaBH4 were proposed based on careful comparisons. The key factors controlling the properties of 3NaBH4–LnF3 can be summarized as follows: (i) electronegativity χp of Ln3+ determines the thermodynamic stability of 3NaBH4–LnF3 composites with their χp in the range of 1.23–1.54 being suitable for reversible hydrogen storage; (ii) the electronic configuration of Ln3+ influences rehydrogenation behaviors: more stable the oxidation state of the Ln3+ is, the better is the rehydrogenation performance of NaBH4; (iii) the unique crystal structure of the Ln–B phase formed during dehydrogenation, and geometrical configuration of B in Ln–B, provide dangling bonds for hydrogen atoms to embed in, consequently modifying the rehydrogenation kinetics. Because Gd3+ possesses a combination of suitable electronegativity, stable oxidation state and favorable geometric structure in GdB4, the 3NaBH4–GdF3 composite exhibits the best overall hydrogen storage properties among all the studied 3NaBH4–LnF3 composites, with high cycling stability up to 51 cycles along with fast kinetics. This understanding provides us with criterions to design new borohydride-based hydrogen storage systems and to optimize their hydrogen storage properties.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
Journal of Energy Storage
·
2024
·
IF 8.9
Tianping Feng,Xuelai Zhang,Jun Ji
In the context of the dual‑carbon target, there is a high emphasis on the energy efficiency of traditional mechanical cold storage systems with significant power consumption . Additionally, the implementation of time-of-use electricity pricing has played a crucial role in driving the rapid advancement of energy storage technology . The application of energy storage technology in cold storage can significantly reduce the energy consumption of the refrigeration system , save operating costs by shifting peak demand to valleys, and reduce start and stop frequencies. Therefore, studying phase-change materials with high latent heat, low cost, and good performance for cold storage is of great practical application in cold storage. The paper developed four types of gel-type phase-change cold storage materials with high latent heat, low cost, and good cycle stability. These materials mainly consist of NH4Cl, KCl, and deionized water . The phase transition temperature ranges from −18 to −21 °C, the latent heat of phase change is approximately 260 to 289 J/g, and the thermal conductivity ranges from 0.58 to 0.60 W/(m·K), which can meet the cooling demand of cold storage facilities. Furthermore, by comparing the phase transition temperature, latent heat value of phase change, and cyclic stability, a gel-type PCM with good comprehensive properties was selected for corrosion and corrosion inhibition studies with five common metal samples in welded and non-welded forms. The results showed that material B2 had slight corrosion on 1060 aluminum , 6061 aluminum, and 304 stainless steels , but no obvious corrosion phenomenon was found on 316 stainless steels . The corrosion rate of the material on red copper was the highest, and the corrosion was too strong. In addition, the corrosion of welded parts is more serious than that of non-welded parts, and the welding points are more susceptible to corrosion. Adding the corrosion inhibitor BTA to material B2 can reduce the corrosion rate of red copper by more than 94 %.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Xin Wang,Shuai Lin,Haiyun Tong,Yanan Huang,Peng Tong,Bangchuan Zhao,Jianming Dai,Changhao Liang,Hai Wang,Xuebin Zhu,Yuping Sun,Shixue Dou
Two-dimensional (2D) MXenes such as Ti 3 C 2 , Ti 2 C, Mo 2 C, and Mo 1.33 C have shown excellent electrochemical performances as supercapacitor electrodes, and the exploration of new and/or high-capacity MXene-based supercapacitor electrode materials is an active field. In this work, 2D multi-layered V 4 C 3 MXene has been synthesized by selectively etching Al from V 4 AlC 3 and it shows a high capacitance of 209 F g −1 at 2 mV s −1 , good rate performance, and stable long cyclic performance with capacitance retention rate of 97.23% after 10000 cycles at 10 A g −1 in 1 M H 2 SO 4 . Importantly, the pseudocapacitance (∼100.1 F g −1 ) accounts for about 37% of the total capacity (∼268.5 F g −1 ) for V 4 C 3 MXene electrode. Therefore, the high specific capacitance of V 4 C 3 MXene is not only due to their wide interlayer spacing (∼0.466 nm), large specific surface areas (∼31.35 m 2 g −1 ) and pore volumes (∼0.047 cm 3 g −1 ), and good hydrophilicity but also attributed to the abundant valence states of vanadium (+2, +3, and +4). The high rate performance and excellent cycling stability of V 4 C 3 MXene electrodes are mainly attributed to the high electronic conductivity (1137 S m −1 at 300 K). The present work provides another promising MXene-based supercapacitor electrode material.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Zhiyuan Zhang,Zhihao Sun,Shibo Sun,Jinyu Liu,Jiqiong Jiang,Wei Shang,Yuqing Wen
As a kind of clean energy, magnesium batteries have become the main research direction of next-generation batteries. A long voltage lag time and irreversibility in aqueous electrolytes are problems faced by magnesium aqueous batteries. For the first time, we modified the anode of a magnesium aqueous battery with MXene . The modified battery not only reduced the voltage lag time of the battery but also improved the reversibility, cycle stability, and intermittent discharge performance of the magnesium aqueous battery. The calculation results of density functional theory showed that there is a high adsorption energy between MXene film and magnesium alloy . The calculation results of the ion diffusion energy barrier indicated that magnesium ions have a lower migration barrier on the surface of the MXene film layer. This research is of great significance to the development and application of magnesium batteries.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2013
·
IF 3.777
Qin Hao,Caixia Xu,Suzhen Jia,Xiaoyun Zhao
Fe 2 O 3 nanoparticles are employed as a coating material to optimize the electrochemical performance of LiCoO 2 at high voltage. When the current rate is 1 C with the cutoff potential at 4.5 V, the 5 wt.% Fe 2 O 3 -coated LiCoO 2 delivers an initial capacity of 168.7 mAh g −1 . More importantly, its capacity retention after 50 cycles reaches up to 92.6%, whereas the value for pristine LiCoO 2 is only 58.5%. The electrochemistry impedance spectroscopy analysis demonstrates that Fe 2 O 3 coating plays an important role in decreasing the charge transfer resistance of cell. Compared with the performance of the Fe 2 O 3 -mixed and Fe-doped LiCoO 2 samples, it is found that the role of Fe 2 O 3 coating is unique, which may change the characteristic of the surface of LiCoO 2 particles. This technique may provide an effective and convenient way for optimizing other electrode materials .
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 19
·9350-9357
·
IF 8.867
Jingjing Zhou,Jun Yang,Zhixin Xu,Tao Zhang,Zhenying Chen,Jiulin Wang
Rechargeable lithium–selenium (Li–Se) batteries are promising electrochemical systems with higher energy density than traditional Li ion batteries. Nevertheless, the dissolution of high-order lithium selenides and the shuttle effect in electrolytes lead to low Se utilization, inferior capacity and poor cycling performance. This study proposes a combination of nanostructured Se cathode materials and compatible carbonate electrolytes for promoting the performance of Li–Se batteries. Se/MC composite nanoparticles (∼35 nm) with a moderate Se content (≈51.4 wt%) were prepared by embedding Se into a metal–organic framework derived microporous carbon. The resulting Se/MC cathode exhibits significantly high rate capability and cycling stability in LiDFOB/EC-DMC-FEC electrolyte. It delivers a capacity of 511 mA h gSe−1 after 1000 cycles at 5C, with an inappreciable capacity decay of 0.012% per cycle. Even at a very high rate of 20C, a large capacity of 569 mA h gSe−1 can be obtained, corresponding to a decrease of only 5.6% compared to that at 0.5C. The impressive high rate performance is attributed to the co-effect of selenium confined in ultra-small microporous carbon particles and excellent compatibility of the electrolyte with both the Li anode and selenium composite cathode.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Zhennan Chen,Jingjing Du,Jianbo Shi
Lithium, an emerging mineral of critical global significance, is recognized as a strategic resource by major economies worldwide, leading to an increased demand for this essential element. The extraction of lithium from rich sources, such as seawater and brine, has become commonplace. Among various liquid lithium extraction techniques, the lithium-ion sieve (LIS) adsorption method has attracted substantial attention owing to its simplicity, high recovery rate, and relatively low energy consumption. Despite significant advancements in LIS technology, the powdery nature of these materials poses challenges to handling and recycling, leading to inevitable adsorbent loss and limited practical applications. LISs are typically recycled through powder shaping, but the commonly employed shaping methods may result in a reduction in the adsorbent’s adsorption capacity. Therefore, it is urgent to develop a technology that can not only realize the recycling of LISs but also avoid the loss of the adsorbent’s adsorption capacity. We synthesized a titanium-based LIS (HTO) hybrid membrane by incorporating 2D MXene, known for its excellent properties across various applications. The incorporation of MXene into the membrane significantly increased the pore structure, enhancing adsorption site exposure and facilitating Li + migration. The HTO/MXene@PVC hybrid film demonstrated favorable adsorption properties, with an Li + adsorption capacity of 25.4 mg·g −1 within 24 h. Additionally, the film exhibited notable selectivity capacity and maintained its adsorption capacity above 90 % even after eight adsorption–desorption cycles, indicating excellent cycling performance. This study introduces a novel design concept for adsorbents, specifically for extracting Li + from liquid lithium sources, offering new insights for the development of Li + adsorbents aimed at enhancing lithium recovery.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
Advanced Materials Technologies
·
2025
·
IF 6.2
Haoming Xu,Wenli Li,Imtiaz Haider,Yuhua Zheng,Mianqi Xue,Jiechao Ge,Bao Wang,Serge Zhuiykov,Yanbin Cui
Structural design and interlayer architecture of electrochromic (EC) materials play significant role in their performance. Herein, tungsten trioxide (WO 3 ) nanoflowers have been synthesized through in situ intercalation with polyaniline (PANI), developing a 3D hierarchical structure with optimized interlayered spacing. The PANI-WO 3 composite showed superior EC stability due to improved ion storage capacity by 3D hierarchical structure with extended surface area for ion interaction. The enlarged layer spacing of PANI-WO 3 composites allows for accommodating more exchangeable Li + . The PANI-WO 3 film maintains remarkable cycling stability, retaining 80% of its initial capacity after 30000 cycles. The EC device based on PANI-WO 3 demonstrates high optical modulation (57% at 633 nm), rapid switching speeds (coloration to 23% in 15 s and bleaching to 80% in 10 s) and high coloration efficiency (168 cm 2 C −1 ). Meanwhile, the PANI-WO 3 EC supercapacitor achieves a high specific capacitance (121 mF cm −2 at 0.2 mA cm −2 ) and prolonged cyclic life (specific capacity remains at 58% and coulombic efficiency at 65% after 1500 cycles). The PANI-WO 3 serves as an effective candidate for the fabrication of high-performance EC devices (ECDs) with potential applications in energy-saving smart windows, outdoor static displays, and other energy-efficient technologies.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）