JOURNAL OF POWER SOURCES
·
2022
·
IF 9.794
Yi-Xuan Li,Xiang Ding,Fei Chen,Kuo Cao,Chun-Hua Chen
NaClO 4 is utilized as a salt-type electrolyte additive to improve the electrochemical performance in both Li-rich/graphite full cells and Li-rich/Li half cells. The corresponding characterizations such as scanning electron microscopy and X-ray photoelectron spectroscopy reveal that the NaClO 4 -added electrolyte can suppress the transition metal dissolution from Li-rich cathode and form a stable conductive cathode electrolyte interface layer to protect Li-rich cathode and promote Li + ions transfer. A small amount (0.1 wt%) of NaClO 4 additive enables Li-rich/graphite full cells to maintain 86% capacity after 50 cycles and Li-rich/Li half cells to maintain 95% capacity after 100 cycles, showing a great application potential.
研究领域:
电化学
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材料科学
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能源存储
·
电池技术
·
功能材料
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2015
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IF 2.037
Chunli Liu,Li Zhou,Liqun Fan,Chonggui Ren
Enthalpies of solution and densities of glycylglycine in aqueous solutions of NaNO3, NaClO4, and Na2SO4 were measured at 298.15 K. Standard transfer enthalpies (ΔtrH0), standard transfer partial molar volume (ΔtrVϕ0), and hydration numbers (Nh) have been determined for glycylglycine. All of the ΔtrH0 values are negative in the three salt solutions. The relative order of ΔtrH0 in the same concentration of 1–1 type salts is NaNO3 > NaClO4. The ΔtrH0 in low concentration of Na2SO4 solutions is between the corresponding values in NaNO3 and NaClO4 solutions. With increasing Na2SO4 concentration, the ΔtrH0 values exceed that in NaNO3 solutions. The ΔtrVϕ0 values are positive and vary in the sequence Na2SO4 > NaNO3 > NaClO4. The results were discussed in terms of various interactions.
研究领域:
生物化学
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物理化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 35
·17998-18006
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IF 11.301
Yinglun Sun,Yue Wang,Lingyang Liu,Bao Liu,Qingnuan Zhang,Dandan Wu,Hongzhang Zhang,Xingbin Yan
Although water-in-salt (WIS) electrolytes have significantly extended the voltage window of aqueous batteries and supercapacitors, the inevitable precipitation of highly concentrated salts at low temperatures leads to performance degradation and even failure of devices. The introduction of an organic co-solvent can effectively overcome this crucial drawback; however, the underlying mechanism remains unclear. Herein, we demonstrate the study of acetonitrile (ACN) suppressing salt precipitation mechanism in NaClO4-based WIS electrolytes through combining theoretical simulation and experimental analyses. ACN molecules strongly coordinate with Na+ ions to change the solvation structure of the cation–anion from aggregates to contact ion pairs and/or solvent separated ion pairs, weakening the interaction between anions and cations, thereby suppressing the precipitation of NaClO4. Furthermore, using the hybrid electrolyte, a built carbon-based supercapacitor achieves a voltage window of 2.3 V. Impressively, it also retains 86.5% of the room-temperature capacitance and exhibits excellent rate capability and temperature resistance at an ultra-low temperature of −50 °C. This work provides guidance for non-inert co-solvents suppressing salt precipitation, which helps to obtain desired electrolytes for reliable low-temperature supercapacitors.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Junjie Xie,Zhenbang Li,Xueying Zheng,Fei Tian,Danni Lei,Chengxin Wang
Sodium metal batteries have emerged as potential rivals to lithium-ion batteries. Nevertheless, maintaining a stable sodium metal anode under harsh conditions (current density >10 mA cm −2 ) is extremely challenging. The primary issue is the highly reactive sodium metal continuously reacts with the electrolyte to form a thick and loose solid electrolyte film. The tip effect causes sodium ions (Na + ) accumulated in the bulge resulting in uneven deposition. In this paper, a unique artificial interfacial layer (Ag nanoparticles distributed in NaClO 4 -based matrix) is prepared on the surface of a metallic sodium anode using in situ displacement reaction. Ag particles arranged at the bottom of the artificial layer act as effective nucleation sites helping Na + deposit uniformly, while the built-in electric field formed between Ag in the middle/top of the artificial layer and the sodium accelerates the migration of Na + in the interfacial layer during the deposition and reduce the polarization. Such important properties further allow the steady operation of modified sodium metal batteries in very harsh conditions. The symmetric battery achieves reversible stripping/plating for over 1000 h under high current density (10 mA cm −2 ). Moreover, the full cell coupled with a high-loading Na 3 V 2 (PO 4 ) 3 cathode (20 mg cm −2 ) presents a stable cycle performance.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Yuchen liu,Gang Yuan,Xiaona Ren,Qingfa Wang
To quantitatively convert biomass into value-added chemicals or biofuels is still a great challenge. Herein, we develop an efficient electrochemical method to convert the biomass-derived valeric acid into ethers (butyl methyl ether and butyraldehyde dimethyl acetal) or esters (methyl valerate) on boron-doped diamond (BDD) electrode in methanol solution. The products distribution was well controlled by tuning the supporting electrolyte and the KOH amount. 98.7% selectivity and ca. 58% Faraday efficiency for ethers and 96% selectivity for esters were achieved by optimizing the supporting electrolytes, initial molar ratio of VA to KOH, VA feed concentration and anodic potential. Strong alkali as supporting electrolyte, high VA feed concentration and initial VA/KOH=1 (mol/mol) favoured the formation of ether products. Fatty acid methyl esters were high-selectively (>96%) produced by using NaClO 4 as the supporting electrolyte and/or adding excessive KOH (initial KOH/VA ratio beyond 2:1). Moreover, partially replacing methanol with ethanol, only one new diether (1,1-diethoxybutane) was formed. A rational mechanism of synthetic butyraldehyde dimethyl acetal via electrocatalytic decarboxylation, rearrangement of carbenium ion, Aldol reaction on BDD in alcohols solution was developed. This strategy may provide a new direction for renewable chemicals and fuels from biomass.
研究领域:
电化学
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可再生能源
·
化工工程
·
催化
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生物质转化
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED MATERIALS
·
2025
·
IF 26.8
Zihao Wu,Haoran Guo,Kexin Ren,Yasen Wang,Haotian Zhang,Fuhui Zhang,Lingfeng Liu,Guangye Li,Limin Qi
Traditional photoelectrochemical (PEC) systems struggle to simultaneously achieve high efficiency, high stability, and low cost. Replacing water oxidation with oxidation of organic molecules emerges as an attractive strategy to enhance the hydrogen production efficiency of PEC systems while generating value-added anodic products. Here, a PEC system utilizing a Mo, N co-doped BiVO 4 photoanode and NaClO 4 electrolyte for the glycerol oxidation reaction to approaching the theoretical limit of current doubling that enables a two-electron reaction to be driven by a single photon, is reported. While nitrogen doping optimizes the bulk charge separation/transport performance of Mo-doped BiVO 4 photoanodes, NaClO 4 as the supporting electrolyte further enhances the reaction kinetics and surface charge extraction efficiency. The optimized system reaches a record photocurrent density of 9.73 mA cm −2 at 1.23 V versus RHE and a maximum internal quantum efficiency of 182%. It predominantly produces C-C cleavage products, including glycolaldehyde and formaldehyde, and can maintain stable performance for over 500 h. DFT calculations reveal that glycerol can undergo adjacent hydroxyl bidentate chelation adsorption on the BiVO 4 surface. This system is applicable for the current doubling reaction of various polyhydroxy alcohols, providing a potential pathway for efficient valorization of platform molecules and effective recycling of waste plastics.
研究领域:
光电化学
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可再生能源
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催化
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材料科学
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可持续化学
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氢气生产
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有机氧化
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）