Journal of Energy Storage
·
2024
·
IF 8.9
Jiafeng Zhai,Qingfeng Zhang,Ying Yang,Zhihao Wang,Xuan Tang,Shuhong Xie
The development of high-performance potassium-ion batteries (PIBs) necessitates the research of anodes with high capacity, long cycle life, and excellent rate performance. In this study, we drew inspiration from the structure of diatoms in nature. Through a simple self-template pyrolysis process , Se and S were doped into carbon matrix, leading to the synthesis of Se/S-doped diatomite-like carbon microflakes (Se, S-DCMs) for PIBs. The porous surface structure resembling diatoms, along with the interconnected carbon fibers within the pores, enhances contact between material and electrolyte, thereby accelerating diffusion of K + . Furthermore, the co-doping of S and Se introduces defects, creating additional reaction sites and increasing capacity. As anodes for PIBs, Se, S-DCMs exhibits high capacity (414 mAh g −1 after 100 cycles at 100 mA g −1 ) and high-rate performance (198 mAh g −1 at 2000 mA g −1 ). This study represents a promising approach for optimizing carbon structures to boosting battery performance.
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 Water Process Engineering
·
2024
·
IF 6.3
Xulong Zhang,Xiaoyan Liu,Shiwei Xie,Xian Liu
This study is first to elucidate the efficacy of electrochemical activation of periodate (PI) by permanganate (PM) in enhancing the degradation of bisphenol A (BPA) over a wide pH spectrum. Utilizing a current density of 4 mA/cm 2 , 200 μM PI, and 20 μM PM, the proposed system achieved a 99.8 % degradation of 40 μM BPA within 30 min and a 65.5 % total organic carbon (TOC) removal in 120 min. The combined system yielded a synergistic coefficient of 15.23 for BPA degradation, and energy efficiency of 0.14 KWh•m −3 . The exceptional performance is attributed to the reduction of PM to low-valent manganese species at the cathode, which facilitates the activation of PI. Additionally, the system preserved high BPA degradation efficiency across a pH range of 3–11. Radical quenching and electron paramagnetic resonance spectroscopy experiments confirmed the pivotal role of singlet oxygen in the degradation process. Furthermore, the system exhibited relative insensitivity to actual water matrix constituents, including inorganic ions and humic acid. In conclusion, the proposed system constitutes an eco-friendly treatment process for BPA removal characterized by low energy consumption.
研究领域:
环境科学
·
水处理技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2022
·
IF 3.119
Guo-Liang Nie,Rui-Zhi Cui,Wu Li
According to the composition characteristics of lithium, potassium, bromine, and other resources rich in the salt lake brine of the Qinghai–Tibet Plateau, the phase equilibria of the quaternary system LiBr-NaBr-KBr-H2O and its ternary subsystem LiBr-KBr-H2O at 323.15 K are studied by an isothermal dissolution equilibrium method. The solubility of each system in equilibrium solution at the corresponding temperature is measured, and the corresponding phase diagrams are drawn according to the phase equilibrium experimental data. The results show that there is no complex salt or solid solution in the ternary system LiBr-KBr-H2O at 323.15 K. The phase diagram contains one invariant point (E1), two univariate curves (AE1 and BE1), and two equilibrium solid crystallization regions (corresponding to LiBr·H2O and KBr), belonging to the simple cosaturated type. The quaternary system LiBr-NaBr-KBr-H2O also has no formation of complex salt and solid solution. The phase diagram contains two invariant points (F1 and F2), five univariate curves (E1F1, E3F1, F1F2, E2F2, and E4F2), and four equilibrium solid-phase crystallization regions (corresponding to LiBr·H2O, KBr, NaBr·2H2O, and NaBr). At the same time, to further explain the phase equilibrium relationship of each system at different temperatures and the change rule of each component, comparison and discussion are carried out.
研究领域:
化学工程
·
材料科学
✓ 已验证
DOI
高影响因子
CARBON
·
2022
·
IF 11.307
Yu Lei,Siwei Zhang,Jiahui Dong,Yueteng Gao,Chongwei Gao,Yaojie Wei,Lei Qin,Da Han,Daqing Huang,Guodan Wei,Dengyun Zhai,Feiyu Kang
Potassium-ion batteries (PIBs) have attracted significant attention due to their low cost and high energy density . Despite being a promising anode candidate for PIBs, graphite is still plagued by limited capacity and fast capacity degradation with low coulombic efficiency (CE). Herein, we propose a high-capacity and highly stable potassium-enriched graphite (KRG) anode which surpasses the limitation of parent graphite. The KRG is characteristic of possessing the potassium-graphite intercalation compounds as a potassiophilic host for uniform and high-efficiency plating/stripping of potassium metal. The robust mixed conducting network possessed by the KRG is beneficial for mitigating drastic volume change of the electrode and improving ion/electron transport. A specific capacity of ∼520 mAh/g was demonstrated for KRG anode as the optimized value to maximize the capacity storage while suppressing dendrites growth. With a stable solid-electrolyte interphase buildup, the KRG/Prussian blue full cell with a controlled anode/cathode capacity ratio of 1.1:1 can deliver a high capacity of 108 mAh/g with a CE of 99% after 180 cycles at 1C. Our results provide valuable insights into the rational design of graphitic anodes for high-energy-density PIBs.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2023
·
IF 9.2
Haiyan He,Kuo Cao,Shu Guo,Wenjiao Yao,Fei Chen,Jiemin dong,Chun-Hua Chen
Potassium-ion batteries (KIBs) have attracted more and more attention due to the abundant potassium resources and hence low cost of raw materials. Nevertheless, the performances of KIBs are still unsatisfactory for practical applications, mainly due to the lack of suitable cathode materials . In this work, we report for the first time a novel polyanionic compound K 1+δ VOPO 4 F as a potassium ion storage host. Thanks to its flexible while stable layered [VOPO 4 F] ∞ framework, as a KIB cathode material, it can provide a reversible capacity of about 101 mAh g −1 at a rate of 0.2 C with a 87% capacity retention after 250 cycles. The corresponding energy density of 363 Wh kg −1 is among the highest for K-ion storage. The working mechanism of the V 4+ /V 5+ redox reaction is determined by in-situ X-ray diffraction (XRD) and ex situ X-ray photoelectron spectra (XPS) analyses. Notably, it delivers a stable average capacity of 75 mAh g −1 for 700 cycles at 1 C with a capacity retention rate of 76%. This work presents that K 1+δ VOPO 4 F is a promising K + storage cathode material with merits of high energy density and long cyclability.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Bin He,Mi Feng,Xinyan Chen,Yuandong Cui,Dingwei Zhao,Jian Sun
The limited photocatalytic performance of g-C 3 N 4 has become a bottleneck that restricts the widespread applications in degradation of organic pollutants. In this study, an efficient 1D/2D g-C 3 N 4 /g-C 3 N 4 homojunction was constructed by the synergistic category of dual-ions induction in one pot fashion, integrating multi-advantages of homojunction and doping alkali metal potassium (K). Systematic characterizations confirmed the formation of K ion decorated 1D/2D homojunction structure, and revealed a possible fabrication mechanism. The photocatalytic performances were evaluated towards degrading rhodamine B (Rh B), and ciprofloxacin hydrochloride (CFH), respectively, representing dyeing and antibiotic wastewater treatment. Compared to pristine g-C 3 N 4 , the as-modified catalysts exhibited obvious activity enhancements in both photo-degradation reaction rates, and efficiencies of Rh B and CFH. Detailed information from DRS, ESR, PL results revealed that the obtained excellent performance might ascribe to the improvement of the separation of photogenerated carriers, the harvest of visible light, and the yields of active species. Moreover, the reaction mechanism and stability test were also studied in detail. This study provided a new category for constructing efficient and ion-doping homojunction structure for the enhancement of visible-light activity of g-C 3 N 4 and would promote practical applications of solar energy and metal-free semiconductors.
研究领域:
材料科学
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环境科学
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化学工程
✓ 已验证
DOI
高影响因子
ACS Nano
·
2024
·
IF 15.8
Ling Kang,Shude Liu,Qia Zhang,Jianxiong Zou,Jin Ai,Donghong Qiao,Wenda Zhong,Yuxiang Liu,Seong Chan Jun,Yusuke Yamauchi,Jian Zhang
Molybdenum sulfide (MoS2) is a promising electrode material for supercapacitors; however, its limited Mo/S edge sites and intrinsic inert basal plane give rise to sluggish active electronic states, thus constraining its electrochemical performance. Here we propose a hierarchical confinement strategy to develop ethylene molecule (EG)-intercalated Co-doped sulfur-deficient MoS2 (Co-EG/SV-MoS2) for efficient and durable K-ion storage. Theoretical analyses suggest that the intercalation-confined EG and lattice-confined Co can enhance the interfacial K-ion storage capacity while reducing the K-ion diffusion barrier. Experimentally, the intercalated EG molecules with mildly reducing properties induced the creation of sulfur vacancies, expanded the interlayer spacing, regulated the 2H–1T phase transition, and strengthened the structural grafting between layers, thereby facilitating ion diffusion and ensuring structural durability. Moreover, the Co dopants occupying the initial Mo sites initiated charge transfer, thus activating the basal plane. Consequently, the optimized Co-EG/SV-MoS2 electrode exhibited a substantially improved electrochemical performance. Flexible supercapacitors assembled with Co-EG/SV-MoS2 delivered a notable areal energy density of 0.51 mW h cm–2 at 0.84 mW cm–2 with good flexibility. Furthermore, supercapacitor devices were integrated with a strain sensor to create a self-powered system capable of real-time detection of human joint motion.
研究领域:
材料科学
·
能源存储
·
电化学
✓ 已验证
DOI
PubMed
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2020
·
IF 3.232
Hongtian Liu,Juewei Ning,Guangjie Song,Xiangzhong Sun,Fengyu Su,Pengfei Li,Yanqing Tian
A potassium ion‑oxygen (K + –O 2 ) dual fluorescent sensing film was developed. The film contains three probes, which are K + probe (KS), O 2 probe (OS), and reference probe (RP) in a polymer film composed of poly(ethylene glycol) methyl ether methacrylate (PEGMA), poly(ethylene glycol) dimethacrylate (PEGDMA) and methacrylic acid (MAA). The RP showed blue emission, the KS exhibited green emission, and the OS showed red emission. The emission peaks of three probes do not interfere with each other, which enable the sensing film to be used for ratiometrically and quantitatively detecting the concentrations of K + and dissolved oxygen (DO). The sensing films showed high sensitivity and selectivity to potassium ions over other metal ions and also good sensitivity for DO from deoxygenated to oxygenated conditions. The sensing film was demonstrated to be capable of analyzing K + and DO concentrations with experimental errors smaller than ±8.5% in aqueous solutions, showing the potential applications of the sensing films.
研究领域:
生物化学
·
分析化学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2021
·Vol. 10
·期 2
·682-689
·
IF 12.732
Ruling Huang,Xixue Zhang,Zexi Qu,Xiaodong Zhang,Jiao Lin,Feng Wu,Renjie Chen,Li Li
Heteroatom-doping had been demonstrated to effectively improve the capacitive energy storage of hard carbon in potassium ion batteries (KIBs). However, external defects introduced during the doping process are responsible for the alteration of the microstructure of the carbon host. But there is a scarcity of systematic in-depth understanding of the comprehensive effects of defects and heteroatoms in hard carbon for K storage performance. Herein, a series of porous carbon microspheres at different defect levels and S-doping amounts (SPCS) were simply synthesized at different carbonization temperatures. It was found that various microstructural features of SPCS exhibited different trends with the change of carbonization temperature. Moreover, the depth of the K-ion insertion reaction, the additional oxidation–reduction reaction, and the adsorption process of K ions on active sites can be enhanced by regulating the S-doping amount and defect level. Especially, the best SPCS can obtain a prominent reversible charging capacity of 435.1 mA h g−1 at 50 mA g−1 over 100 cycles. In addition, in situ XRD characterization reveals that its lattice structure undergoes a disordered transformation without the expansion of interlayer spacing during the K-ion insertion process. This work demonstrates that rational regulation of doping engineering is of great significance for obtaining high-performance carbon anodes for KIBs.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Chang Liu,Hongjie Zheng,Yuwei Wang,Nan Xiao,Kai Yu,Hui Li,Xu Zhang,Hongcun Bai,Tianyi Ma,Jieshan Qiu
Soft carbon has been regarded as one of the most promising anode materials for potassium-ion batteries. However, the rearrangement of planar aromatics at high carbonization temperature usually yields a highly graphitized structure, which generally leads to inferior rate and cycle performance. In addition, the role of intrinsic carbon defects on potassium storage has not been well reported yet. In this work, crosslinked pitch-based soft carbon nanosheets have been synthesized through the iodination/dehydroiodination process at low temperature and carbonization with NaCl template. The iodine-treatment efficiently crosslinks the planar aromatics to three-dimensional framework by alkyl-bridged linkages, and reduces the strong π-π interaction during carbonization. This unique microstructure yields an ordered-in-disordered carbon microstructure, enlarged interlayer spacing, and abundant intrinsic defect sites. Benefited from these merits, the optimal sample displays 140% increase of reversible capacity to the pristine pitch-based carbon at 5 A g −1 . Particularly, it also presents 87.4% capacity retention after 1000 cycles at 1 A g −1 . This facile but simple strategy is expected to expand to other high-performance carbon materials and further understand the effect of intrinsic defects for potassium storage and beyond.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF POWER SOURCES
·
2025
·
IF 7.9
Haozheng Hu,Yaochun Yao,Xianghao Meng,Yin Li,Keyu Zhang,Shaoze Zhang,Yusong Yang,Yanqiu Xu,Junxian Hu
With the growing retirement of lithium iron phosphate (LiFePO 4 ) batteries, advanced recycling strategies are garnering widespread attention for resource sustainability. However, key issues such as high costs and improper disposal of hazardous waste urgently need to be addressed. Therefore, this paper proposes a systematic, green, and sustainable recycling process for spent LiFePO4 batteries. This method employs potassium pyrosulfate as a leaching agent to replace traditional inorganic acids, thereby reducing the negative environmental impact. Under optimal experimental conditions, the lithium (Li) leaching rate reaches 98.33 %, while the iron (Fe) leaching rate remains below 0.5 %, demonstrating high selectivity. The leaching process of LiFePO 4 in potassium pyrosulfate-hydrogen peroxide aqueous solution follows an Avrami kinetic model: l n k + n l n t = ln ( − ln ( 1 − x ) ) with an apparent activation energy of 18.69 kJ mol-1. This process is limited by both chemical and diffusion reactions. The recovered products, lithium carbonate and iron phosphate are utilized to synthesize regenerated LiFePO 4 . Compared to waste LiFePO 4 and fresh LiFePO 4 , the regenerated LiFePO 4 exhibits good electrochemical performance. Finally, an economic analysis reveals that the designed regeneration pathway possesses significant recovery value potential. This study proposes an efficient, economical, and sustainable closed-loop recycling technology for used lithium-ion batteries, facilitating resource recovery and environmental protection.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
RARE METALS
·
2024
·
IF 9.6
Deng Li-Ying,Zhang Qing,Li Wang-Yang,Ye Xiao-Yuan,Zhao Yi-Fan,Chen Shen-Zhong,Wang Yu-Lan,Wang Xing-Hui,Chen Hui-Peng,Yu Zhi-Yang,Yan Qun,Cheng Shu-Ying,Guo Tai-Liang,Hu Wen-Ping,Ding Feng,Sun Jie
Two-dimensional (2D) metal oxides (2DMOs), such as MoO 2 , have made impressive strides in recent years, and their applicability in a number of fields such as electronic devices, optoelectronic devices and lasers has been demonstrated. However, 2DMOs present challenges in their synthesis using conventional methods due to their non-van der Waals nature. We report that KCl acts as a flux to prepare large-area 2DMOs with sub-millimeter scale. We systematically investigate the effects of temperature, homogeneous time and cooling rate on the products in the flux method, demonstrating that in this reaction a saturated homogenous solution is obtained upon the melting of the salt and precursor. Afterward, the cooling rate was adjusted to regulate the thickness of the target crystals, leading to the precipitation of 2D non-layered material from the supersaturated solution; by applying this method, the highly crystalline non-layered 2D MoO 2 flakes with so far the largest lateral size of up to sub-millimeter scale (~ 464 μm) were yielded. Electrical studies have revealed that the 2D MoO 2 features metallic properties, with an excellent sheet resistance as low as 99 Ω·square −1 at room temperature, and exhibits a property of charge density wave in the measurement of resistivity as a function of temperature. Graphical abstract TOC (Table of Content)
研究领域:
材料科学
·
电子器件
·
晶体生长
✓ 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）