BIORESOURCE TECHNOLOGY
·
2016
·
IF 4.917
Qing Qing,Linlin Zhou,Qi Guo,Meizi Huang,Yucai He,Liqun Wang,Yue Zhang
Na 3 PO 4 and Na 2 S were employed as efficient alkaline catalysts for the pretreatment of corn stover. To systematically obtain optimal conditions, the effects of critical pretreatment parameters including sodium phosphate concentration (1–4%), sulfidity (0–20%), pretreatment temperature (100–120 °C), and reaction time (20–60 min) on the reducing sugar yield of pretreated substrates were evaluated in a lab-scale using the response surface methodology. Pretreated under the sodium phosphate concentration of 4%, sulfidity of 10%, temperature of 120 °C, and reaction time of 40 min, the reducing sugar yield and glucose yield of the pretreated corn stover achieved 91.11% and 64.01%, respectively, with a moderate enzyme loading of 30 FPU/g substrate. Additionally, a strong correlation (R 2 = 0.971 and R 2 = 0.954) between the delignification and the reducing sugar yield (or glucose yield) was observed by this pretreatment method. These results evidently support that the combined Na 3 PO 4 -Na 2 S pretreatment is an effective and feasible method for processing lignocellulosic biomass.
研究领域:
生物技术
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生物质能
·
酶解技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Zhaoyang Wang,Fangyu Xiong,Haizheng Tao,Yuanzheng Yue
To optimize the Na 0·74 CoO 2 -based cathode materials for sodium-ion batteries, we fabricated a series of Na 0·74 CoO 2 /C/N-based composites by sintering the mixtures of ZIF-4(Co) (Co [H 2 C 3 N 2 ] 2 ) and Na 2 CO 3 , which possess various molar Na/Co ratios (X = 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, 1.2 and 2.0), at 800 °C for 6 h. By performing the electrochemical characterizations, we found that the composite with X = 0.7 (NC-0.7) exhibits the optimum sodium storage performance, i.e., excellent Na + storage capacity (107.9 mA h g −1 at 0.1 C), and high cycling stability (74% of the discharge capacity retention after 500 cycles at 10 C). In addition, for this NC-0.7 composite, we discovered a large difference (48.1 mA h g −1 ) between the charging (59.8 mA h g −1 ) and discharging (107.9 mA h g −1 ) capacities for the first cycle. Using the X-ray photoelectron spectroscopy, high-resolution transmission electron microscopy, and scanning transmission electron microscope, we clarified the atomic-scale origin of the large capacity difference, and revealed the role of the amorphous phase in the as-prepared Na 0·74 CoO 2 /C/N composite cathode.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2023
·Vol. 27
·期 6
·1433-1441
·
IF 2.5
Mao Qianlun,Jia Yuexin,Zhu Wenhao,Gao Lijun
Antimony (Sb) has been recognized as one of the most promising metal anode materials for sodium-ion batteries, owing to its high capacity and suitable sodiation potential. Nevertheless, the large volume variation during (de)alloying can lead to material fracture and amorphization, which seriously affects their cycling stability. In this work, we report an engineering strategy by encapsulating Sb nanoparticles in nitrogen-doped spherical carbon shells (Sb@CN). This unique structure can efficiently accommodate volume variation and release stress upon sodiation, thus maintaining structural integrity. As a result, the Sb@CN composite exhibits an excellent sodium storage performance, achieving a capacity of 282 mAh g −1 over 5000 cycles at the current density of 0.66 A g −1 , and the capacity retention rate from the second cycle to the 5000th cycle is close to 100%. Moreover, it also shows a remarkable rate capability of 217 mAh g −1 at a high current density of 3.3 A g −1 . It is believed that this composition strategy would provide guidance toward stable alloy anodes for sodium-ion batteries.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2015
·Vol. 3
·期 32
·16495-16500
·
IF 7.443
Haomiao Li,Kangli Wang,Wei Li,Shijie Cheng,Kai Jiang
Sodium ion batteries are attractive alternatives to lithium ion batteries for stationary energy storage technology, and titanates are considered as promising anode materials for sodium ion batteries. Herein, a series of sodium titanates were synthesized via a simple, fast and controllable electrochemical route from solid TiO2 in molten salts of NaF–NaCl–NaI. For the first time, the as-prepared Na0.23TiO2 and Na0.46TiO2 were utilized as anode materials for sodium ion batteries, with a sodium storage capacity of 185 mA h g−1 and 215 mA h g−1 after 200 cycles, respectively. High rate and long term tests indicated the excellent cycle performance due to the formation of a 3D porous electrode structure during the long term charge/discharge processes.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Jiarong He,Tao Tao,Fan Yang,Zhipeng Sun
Sodium-ion batteries (SIBs) are prospective and fascinating for stationary energy storage systems (ESS) because of the abudance of sodium (Na) resource and their excellent cycle stability. Exploring for advanced anode materials with robust framework and appropriate crystallographic sites, is of great significance to effectively boost the practical applications of SIBs and to largely decrease the potential safety issues of alloy-type anodes with large volume changes during cycling. Herein, two hydrated vanadium phosphates [K 3 V 3 (PO 4 ) 4 ·H 2 O, KVP] are delicately prepared by freeze-drying and sol–gel heating drying, denoted as KVP-FD and KVP-HD, respectively, and used as novel anodes for SIBs to reveal their Na + intercalation mechanism. KVP-HD electrode possesses a much superior discharge capacity and a higher capacity retention (185.6 mAh g −1 , 72.2 %) at 1C for 300 cycles, and more excellent rate capability at high C-rates (greater than1C) than KVP-FD (127.4 mAh g −1 , 45.5 %). Cyclic voltammetry, galvanostatic intermittent titration and electrochemical impedance spectroscopy, manifest a more alleviated polarization, smaller impedance and faster diffusion kinetics of KVP-HD electrode than KVP-FD. Exsitu -X-ray diffraction ( exsitu -XRD) further reveals that polyanionic KVP-HD material possesses a robust structure and provides fast ion diffusion tunnels to reversibly (de)intercalate the Na + /K + due to the pillar K + residing and holding the structure. The electrochemical mechanism switch successively from an initial predominant K + to a subsequent mixed Na + /K + (de)intercalation in the polyanionic KVP during cycling. This work innovatively lights up the future to use Na-free KVP polyanion as robust framework for advanced anode in SIBs, which gives insightful reference for using Na-free materials for next-generation SIBs anodes towards a much safer and a more cost-effective battery system.
研究领域:
材料科学
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电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
·
2025
·Vol. 16
·期 1
·1-13
·
IF 15.7
Sun Xue,Li Haitao,Song Yajie,Liu Jiaxuan,Ji Pengxiang,Lei Xincheng,zhang Xiangzhi,Liu Qingsong,Li Menglu,Deng Biao,Su Dong,Wang Jiajun
Sodium (Na)-air batteries show significant potential as alternatives to lithium-air batteries due to their high theoretical energy density and the abundant availability of sodium reserves. Nevertheless, the formation of complex products, specifically NaO 2 , Na 2 O 2 , Na 2 CO 3 ·xH 2 O, during the multi-step reactions inevitably raises reconciled potential incompatibility that causes low efficiency and large overpotential. Here, we introduce a cascade electrocatalysis strategy that involves switchable metal and oxygen redox chemistry through electrochemical potential tuning. Leveraging the lithium ion spatial pinning effect, sodium ions trigger in the Na[Li 1/3 Ru 2/3 ]O 2 electrode system to toggle the geometric state at a low electrochemical potential and oscillate among different catalytic states to achieve sequential conversion of complicated multi-step intermediates. The Na[Li 1/3 Ru 2/3 ]O 2 catalyst effectively compartmentalizes the threshold potential that circumvents deactivating or competing pathways while coupling different catalytic cycles. As a result, the sodium-air battery employing this catalyst exhibits long-term reversibility over 1000 cycles with a decent catalysis efficiency exceeding 99%. Our results demonstrate that the cascade electrocatalysis strategy contributes to the design of integrated sodium-air batteries with long-term cycling stability.
研究领域:
储能技术
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电化学
·
材料科学
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纳米技术
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电池技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Kai Li,Zihang Zhang,Chenxi Sun,Weiguang Han,Mengmeng Zhen,Huiling Liu
Anatase titanium dioxide (TiO 2 ) has garnered significant attention as an anode material for sodium-ion batteries (SIBs) due to its high crystallinity and two-dimensional (2D) diffusion pathways. However, its semiconducting nature results in poor electrical conductivity and sluggish Na⁺ diffusion kinetics. To address these limitations, we propose a novel strategy that integrates the highly exposed TiO 2 (001) facet with Ti 3 C 2 T x MXenes, resulting in the formation of a heterostructure denoted as ((001)T-MX). This heterostructure leverages the strengths of both components to mitigate the shortcomings of TiO 2 alone. The highly exposed TiO 2 (001) facet exhibits a lower Na⁺ insertion energy barrier compared to the TiO 2 (101) facet, thereby facilitating enhanced Na⁺ diffusion along the (001) direction. The incorporation of MXenes not only reduces the band gap energy but also significantly improves the electron conductivity, addressing the inherent conductivity issues of TiO 2 . As an SIB anode, the (001)T-MX delivers a high specific capacity of 121.3 mAh g −1 at 0.5 A g −1 after 500 cycles and exhibits superior cycling stability with a specific capacity of 99.1 mAh g −1 after 1000 cycles at 1.0 A g −1 . This work provides a robust framework for developing advanced heterostructures with tailored crystal faces, paving the way for enhanced energy storage solutions.
研究领域:
材料科学
·
储能技术
·
纳米技术
·
电化学
·
电池技术
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2024
·
IF 5.5
Xiangrui Chen,Chengdeng Wang,Haofeng Shi,Jinpeng Li,Jiashuai Wang,Zhi Wang,Zhaokun Wang,Liyuan Bai,Yan Gao,Guanyong Wang,Yousong Gu,Xiaoqin Yan
Referred to as potential options for anodes in sodium-ion batteries, transition metal chalcogenides (TMCs) exhibit unique electronic and structural characteristics. However, the limited electrical conductivity inherent in them poses a hindrance to electron transport, while their tendency to undergo volumetric expansion during cycling exacerbates structural instability, thereby imposing constraints on practical applications. Herein, a dual molten salt etching strategy followed by a sulfidation-selenidation process was employed to anchor multi-component sulfides FeS 2 /NiS and FeSe/NiSe onto conductive Ti 3 C 2 T x MXene, achieving superior sodium storage performance. Owing to the enhanced Na⁺ and faster kinetics of electronic transport, mechanical strain is effectively reduced, and strong covalent interactions are formed at the interface, significant enhancement in the cycling stability is observed for the anodes of Ti 3 C 2 T x @FeS 2 /NiS and Ti 3 C 2 T x @FeSe/NiSe (with specific capacities of 309.4 and 162.6 mAh g −1 , respectively, after 1000 cycles at 5 A g −1 , with a former retention capacity rate that can reach as high as 87.8 %) and exceptional rate performance (252.1 and 207.8 mAh g −1 , respectively, at 8 A g −1 ). Furthermore, full cells assembled by pairing Ti 3 C 2 T x @FeS 2 /NiS and Ti 3 C 2 T x @FeSe/NiSe with Na 3 V 2 (PO 4 ) 3 cathodes also demonstrate excellent cycling performance, with both configurations achieving up to 500 cycles. The suggested approach enables efficient utilization of byproducts from Lewis acidic etching, expanding possibilities for synthesizing high-performance anodes in sodium-ion batteries consisting of MXene and TMCs.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2020
·
IF 5.065
Cheng Yuan,Deng-Jing Chen,Qiu-Xiang Ye,Kai Xiao,Li-Sheng Hao,Yan-Qing Nan
The CO 2 /N 2 -triggered switchable sol–gel transition based on sodium deoxycholate (NaDC) and sodium chloride (NaCl) aqueous solutions has been investigated using both experiments and molecular dynamics (MD) simulations. The effects of CO 2 on the phase behavior, viscosity, pH, electrical conductivity, and microstructure of the NaDC/NaCl mixed system were explored. The mixed system exhibits a recycled CO 2 /N 2 response, and switching between solution state and gel state with six orders of magnitude variation in shear viscosity was achieved within a narrow pH range of 7.82–7.20. The FT-IR and 1 H NMR spectra of the mixed system before and after CO 2 bubbling were measured. The experimental results indicate that NaDC is not directly protonated to deoxycholic acid by the small amount of CO 2 present; instead, an acid salt structure with a strong hydrogen bond , that is, [RCOOH⋯OOCR] − , is formed. MD simulation results reveal that, in the aqueous mixed NaDC/NaCl/CO 2 system, three types of bridging hydrogen bonds between two deoxycholate (DC − ) anions and one H 3 O + or HCO 3 − ion are key factors for the formation of hydrogels. These bridging hydrogen bonds promote the formation of DC − pairs bridged by H 3 O + or HCO 3 − ions (including the acid salt structure) and are beneficial to the growth of micelles and formation of hydrogels. It is worth noting that the bridging hydrogen bond connected by HCO 3 − ions is an aspect of CO 2 -induced hydrogels that distinguishes them from acid-induced hydrogels. In addition, the results indicate that CO 2 and NaCl have a synergistic effect when inducing hydrogel formation. Based on experiments and MD simulations, a CO 2 /N 2 -switchable sol–gel transition mechanism for an aqueous mixed NaDC/NaCl system has been proposed.
研究领域:
化学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Yan Liu,Qingzhao Li,Yuying Lei,Dingli Zhou,Wenwei Wu,Xuehang Wu
The key to practical applications of sodium (Na) metal batteries is to develop high-performance Na metal anode. However, the unstable electrode/electrolyte interface induced by the Na dendrite growth severely shortens the working life of Na metal anode. In this work, we have developed a facile method based on a replacement reaction to construct an Ag metal layer for Na metal electrodes. The presence of robust and sodiophilic Ag metal layer can guide the uniform plating and stripping of Na ions on the surface of Na metal anode and effectively suppress the Na dendrite growth. Benefiting from a stable electrode/electrolyte interface, the increase of interfacial resistance of the Ag-protected Na metal (Na@Ag) electrode is significantly lower than that of the bare Na electrode after repeated plating/stripping. As a result, the symmetric cell with two identical Na@Ag electrodes exhibits superior cycling stability with stable over-potentials for more than 1100 h at a current density of 1 mA cm −2 and good rate performance with an over-potential of 210 mV at a current density of 5 mA cm −2 compared to the symmetric cell with two identical bare Na electrodes. Moreover, the full cell with an NaTi 2 (PO 4 ) 3 (NTP) cathode and an Na@Ag anode maintains good cycling stability with a capacity retention of 93.8% after 600 cycles, while the Na||NTP full cell breaks down in the 243th cycle.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Energy Storage Materials
·
2024
·
IF 18.9
Zhilin Zheng,Xiaoqiao Li,Yong Wang,Yunlong Zhang,Yufeng Jiang,Yu-Shi He,Chao Niu,Haiying Che,Linsen Li,Zi-Feng Ma
Air stability is a crucial factor in the practical application of a battery material, as it profoundly affects the material's preparation, storage, and electrode fabrication processes. Sodium iron sulfate cathodes, despite their attractive attributes in cost and electrochemical performance, are widely believed to be unstable upon air exposure because of the sulfate group. Here we report remarkable air-stability of the Na 2 Fe(SO 4 ) 2 -based (NFS) cathodes (minimal decay in 20 % RH air for 60 days, 91.9 % capacity retention after 3500 cycles in half cells) and their outstanding cycle performance in practically relevant pouch-type full cells (∼100 Wh kg -1 specific energy, >1000 cycle-life). Although the NFS cathodes do react with moisture H 2 O to produce Na 2 Fe(SO 4 ) 2 ⋅4H 2 O but the hydration is spatially confined at the NFS particles’ surface and not propagating into their bulk. Further, the structural changes are reversible when the surface-hydrated NFS particles are heated in the typical electrode vacuum-drying process, avoiding extra treatment and additional cost. This work reveals the promising properties of the NFS cathode materials towards high-performance and sustainable Na-ion batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2025
·
IF 7.9
Shao-hua Luo,Ge Wang,Guodong Hao,Xinru Tian,Liu Yang,Sheng-xue Yan
Na x Ni 1/3 Fe 1/3 Mn 1/3 O 2 cathode material with high stability and high capacity is favored by researchers. However, during the charge-discharge process, Na x Ni 1/3 Fe 1/3 Mn 1/3 O 2 undergoes a series of complex phase transitions, which lead to the attenuation of its electrochemical performance and severely limit its application. In this paper, a series of Na x Ni 1/3 Fe 1/3 Mn 1/3 O 2 (0.6 ≤ x ≤ 1.0) cathode materials are synthesized by the high-temperature solid-state method, and the influence of varying sodium contents on the structure, Na occupancy, and various performance of the materials is analyzed. The results indicate that all four samples are P2 phase. However, they have different sodium sites (directly under the transition metal element (Na f ) and directly under the gap of the three transition metal elements (Na e )) occupancy. It is found that the Na f to Na e ratio of Na 0.9 Ni 1/3 Fe 1/3 Mn 1/3 O 2 material is 0.55, at which time Na f /Na e is lower and the electrochemical performance is the best. Its initial discharge specific capacity is 112mAg −1 , and after the multiplicative performance test, the discharge specific capacity is 95.7mAg −1 . The study shows that by adjusting the initial sodium content, the occupancy rate of different sodium sites is changed, which significantly affects the morphology, capacity, and cycling stability of the material.
研究领域:
材料科学
·
电化学
✓ 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）