ChemSusChem
·
2025
·
IF 6.6
Jie Wang,Chaowu Wang,Qibo Zhang
Graphical The work develops an efficient solvent extraction methodology using Cyanex 272 for the recovery of cobalt from Co(II)-containing waste Ethaline electrolytes, while enabling solvent regeneration. This proposed method provides an economically viable, highly efficient, and environmentally sustainable approach for recovering metal ions from waste deep eutectic solvent (DES) electrolytes. Efficient recovery of metals from secondary resources is essential to address resource shortages and environmental crises. The development of a cheap, environmentally friendly, and highly efficient recovery pathway is essential for resource retrieval. In this study, we propose a high-efficiency extraction approach utilizing bis(2,4,4-trimethylpentyl) phosphonic acid (Cyanex272) to recover cobalt from waste choline chloride/ethylene glycol (Ethaline) electrolyte containing Co(II) ions. By adjusting the water content of the system to modify the ligand of Co(II) ions, combined with pH adjustment, we achieved an extraction efficiency exceeding 99.9 % for Co(II) ions. Subsequently, oxalic acid (OA) was added as a stripping agent to achieve a recovery efficiency of over 99.4 % for cobalt. The extractant can be recycled more than 15 times after stripping. Impressively, more than 98.3 % of the water-diluted Ethaline extraction raffinate was recovered through reduced pressure distillation while maintaining the structure of recovered Ethaline unchanged. This work provides an economical, efficient, and sustainable pathway for treating waste Ethaline electrolyte-containing metal ions.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ChemSusChem
·
2021
·Vol. 14
·期 7
·1747-1755
·
IF 8.928
Xiaozhou Cao,Song Wang,Xiangxin Xue
Graphical Redox flow battery : A Zn−Ce redox flow battery based on choline chloride ethylene glycol deep eutectic solvent was studied. The open-circuit voltage of the battery reaches 2.2 V, and the coulombic efficiency of the battery is stable at about 84 %, which may provide theoretical support for the development of large-scale energy storage system. Compared with conventional aqueous and ionic liquid electrolytes, deep eutectic solvent (DES) are considered as electrolyte for redox flow batteries because they have a wider electrochemical window and relatively low price. In this study, Ce IV /Ce III and Zn II /Zn redox couples are used as the positive and negative active materials, respectively, in an electrolyte consisting of choline chloride ethylene glycol (ethaline). The structure of Ce III in the positive electrolyte is inferred through spectrum detection. Ce IV /Ce III and Zn II /Zn redox couples show a stable potential difference of 2.2 V (vs. Ag) through cyclic voltammetry. The charge and discharge performance of battery was tested at different current densities. In addition, battery performance was evaluated at different temperatures and concentrations of cerium in the electrolyte. Consequently, at a current density of 0.5 mA cm −2 at room temperature and using 1.0 m Ce III , the battery performance reaches the best coulombic efficiency of 84 %.
研究领域:
电化学
·
储能
·
材料科学
·
电池技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ChemSusChem
·
2024
·
IF 7.5
Xiaozhou Cao,Xiwen Wang,Xiangxin Xue
Graphical A Zn−Fe redox flow battery based on choline chloride ethylene glycol deep eutectic solvent is studied. The coulombic efficiency of the cell maintains at about 100 % more than 50 cycles and shows an anomalous variation due to the effect of RO − groups. The study shows the potential of deep eutectic solvent-based flow batteries for large-scale energy storage. Deep eutectic solvents (DESs) were considered as a potential electrolyte because of their low price, harmless to environment and wider electrochemical window potential compared to water. In this work, Fe(III)/Fe(II) and Zn(II)/Zn redox couples were used as the positive and negative active materials, respectively, in a DES system using choline chloride and ethylene glycol in a molar ratio of 1 : 2 (ethaline). The possible working mechanism of the battery was studied by cyclic voltammetry, spectroscopic and simulation methods. The effects of different temperatures, concentrations of zinc ions in the anolyte and current densities on battery performance were evaluated. The results showed that the designed zinc-iron battery should preferably be operated at a current density of 0.5 mA cm −2 and the temperature of 313~323 K, which will improve the energy efficiency and maintain a high coulombic efficiency. The variation of cycle performance test presents a different pattern from the usual batteries, which is due to the effect of RO − group. At 313 K and 0.5 mA cm −2 , the coulombic efficiency increases from 14.1 % to 100.2 % after 46 cycles, and then remains at about 100 % during the rest 54 cycles, which demonstrates a good cycle stability of DES-based zinc-iron battery.
研究领域:
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
JOURNAL OF PHYSICAL CHEMISTRY B
·
2024
·
IF 2.8
Keke Chai,Toshio Yamaguchi,Taisen Zuo,Jochi Tseng,Kazutaka Ikeda,Yongquan Zhou
Ethaline, a deep eutectic solvent (DES) composed of choline chloride (ChCl)–ethylene glycol (EG) in a 1:2 molar ratio, is garnering significant interest for its wide potential applications. The nature of liquid formation and the structure of H-bonds within ethaline were investigated by X-ray scattering (XRS), neutron scattering (NS), and MD simulations. The sum of the dissociation energy barriers of Ch-EG (3.31 kJ·mol–1) and EG-Cl (4.28 kJ·mol–1) exceeds that of Ch-Cl (5.97 kJ·mol–1). This results in a more pronounced solvation of ChCl by EG compared to ChCl association, facilitating the solubilization of ChCl crystals by EG to form a DES. A partial radial distribution function (PDF) reveals that Cl– solvation is dominated by the hydroxyl group of EG, while the methylene group dominates Ch+ solvation. The spatial distribution function (SDF) shows that the distribution of EG and Cl– around Ch+ partially overlaps with that of the quaternary ammonium group. However, the center of mass distance of Ch-Cl (4.95 Å) is significantly lower than that of Ch-EG (5.65 Å), suggesting a favorable advantage for Cl– in this competition. Chain and ring structure distributions provide direct evidence of the microheterogeneity of ethaline. Hydroxyl groups on the EG promote the formation of a chain structure in ethaline, while methylene groups favor a ring structure. H-bond, carbon H-bond, and Cl– bridge bond restrict Cl– diffusion. This new understanding is crucial for a deeper comprehension of the microstructure of ethaline and for elucidating its mechanisms in applications.
研究领域:
物理化学
·
材料科学
·
计算化学
✓ 已验证
DOI
PubMed
高影响因子
RSC Advances
·
2025
·Vol. 15
·期 38
·31095-31106
·
IF 4.6
Wenqiang Yang,Shaohua Wang,Wen Shi,Yakun Yin,Youpo Mise,Juan An,Xuejiao Zhou,Wentang Xia
The development of high-efficiency, earth-abundant electrocatalysts for the oxygen evolution reaction (OER) is essential for scalable green hydrogen production, yet challenges persist in balancing activity, stability, and cost. Herein, we present a sustainable approach to synthesize Fe-doped cobalt sulfide (Co–S–30Fe) nanoparticles using an ethaline deep eutectic solvent-mediated strategy, which enables precise control over Fe incorporation to optimize both structural and electronic properties. The engineered Co–S–30Fe/NF electrode exhibited exceptional OER performance in alkaline media, requiring an overpotential of only 278 mV at 100 mA cm−2, with a Tafel slope of 44.6 mV dec−1 and outstanding operational stability. Spectroscopic analyses revealed that Fe3+ doping induces three synergistic effects: (1) coexistence of dynamically active Co2+/Co3+ and Fe2+/Fe3+ redox couples, (2) substantial oxygen vacancy generation, and (3) ethaline-directed self-assembly of monodisperse nanospheres (∼96 nm) with 31.6% higher electrochemical surface area. This synergy of electronic reconstruction, defect engineering, and morphology control significantly enhances charge transfer kinetics (67% reduction in charge-transfer resistance) and intrinsic catalytic activity (4.4-fold increase in turnover frequency) compared to undoped Co–S. Critically, in situ electrochemical reorganization during the OER induced a surface transformation into oxygen-rich Co(Fe)–O/OH species, addressing the activity–stability trade-off. When integrated into a Co–S–30Fe/NF‖Pt/C/NF electrolyzer, the system achieved overall water splitting at low cell voltages of 1.53 V and 1.75 V (10 and 100 mA cm−2, respectively) while maintaining stable operation for 100 h at 10 mA cm−2.
研究领域:
电化学
·
纳米材料
·
催化
·
材料科学
·
绿色化学
·
能量转换
·
表面工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2021
·Vol. 33
·期 3
·687-699
·
IF 3.665
Olayinka Oderinde,Onome Ejeromedoghene,Guodong Fu
Tungsten oxide-based composites are important smart materials for wider usage in efficient energy windows, rewritable inks and other colored displays. However, the problem of agglomeration has made it challenging to be employed in transparent, photo-reversible materials especially in functional hydrogels. We herein report the preparation of high transparent hydrogel using water-soluble tungsten oxide-molybdenum oxide nanocomposites. The hydrogel was characterized with FTIR, TGA, XPS, SEM, and UV–Vis–NIR, while the mechanical properties were also analyzed. The FTIR confirmed that the metal oxides combined with the polymer units via strong metal-oxygen bond. For the TGA, the as-prepared hydrogel was still able to maintain a weight loss of 18.12% at 500°C compared to 10.45% for pristine hydrogel. Also, the EDX mapping revealed microscopic metal oxides particles sizes, without any cluster phenomenon appearance. Additionally, the as-prepared hydrogel revealed good mechanical properties as it could sustain a high deformation ratio ( λ ) of 86.3% at a stress of 60.3 MPa due to hydrogen bond crosslinking and ionic bond linkages. Moreover, the hydrogel exhibited high percentage transmittance (T%) of ~83%, as well as remarkable photochromic response, with absorption peaks at ~490, ~630 and ~730 nm appearing as the exposure time of the UV light increases. Furthermore, change in color was observed in 5 s, deepening to deep blue-black at 300 s exposure to UV, while complete reverse fading was achieved in ~6 h in ambient air without external stimulus, hence making it a good potential for applications in various optical memory, sensors and rewritable devices.
研究领域:
材料科学
·
光学
·
纳米技术
·
高分子科学
✓ 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）