RARE METALS
·
2024
·
IF 9.6
Ning Hui-Long,Liang Chao-Ping,Qiang Shan-Shan,Li Jie-Xiang,Tang Sheng,Li Ye-Tao,Sun Wei,Yang Yue
Iron disulfide (FeS 2 ) has been widely used in thermal batteries because of its high theoretical specific capacity and voltage plateau. However, low thermal decomposition temperature, poor conductivity and inferior actual specific capacity limit its wide applications. Herein, we report a gold-doped FeS 2 (FeS 2 -Au), which not only reduces the band gap of the FeS 2 crystals but also enriches the electron transport path of FeS 2 by the formation of Au nanoparticles. First-principles calculation shows that the diffusion energy barrier of lithium-ion is reduced after the Au-doped FeS 2 . In addition, Au increases the electron cloud density around sulfur atoms, which helps to enhance the stability of Fe-S covalent bonds and thus results in better thermal stability of FeS 2 . When the Au content is 130 μg·g −1 (FeS 2 -Au 4 ), the thermal decomposition temperature (TG 5% ) of FeS 2 -Au is 72.2 °C higher than that of pristine FeS 2 . At a discharge temperature of 500 °C, a current density of 200 mA·cm −2 and a cutoff voltage of 1.4 V, FeS 2 -Au 4 demonstrates superior specific capacity and high specific energy compared to FeS 2 . More precisely, the specific capacity of FeS 2 -Au 4 attains a value of 379 mAh·g −1 , with a corresponding specific energy of 714 Wh·kg −1 . In contrast, the discharge specific capacity and specific energy of FeS 2 are lower, amounting to 348 mAh·g −1 and 656 Wh·kg −1 , respectively. This study offers a novel approach to enhancing the electrochemical performance of FeS 2 in high-temperature molten salt electrochemical systems (thermal batteries), thereby laying a solid foundation for its potential practical application. Graphic abstract
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 COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Huanyu Liang,Xinyu Wang,Jing Shi,Jingwei Chen,Weiqian Tian,Minghua Huang,Jingyi Wu,Yue Zhu,Huanlei Wang
The means of structural hybridization such as heterojunction construction and carbon-coating engineering for facilitating charge transfer and electron transport are considered viable strategies to address the challenges associated with the low rate capability and poor cycling stability of sulfide-based anodes in potassium-ion batteries (PIBs). Motivated by these concepts, we have successfully prepared a hydrangea-like bimetallic sulfide heterostructure encapsulated in nitrogen-doped carbon (FMS@NC) using a simple solvothermal method, followed by poly-dopamine wrapping and a one-step sulfidation/carbonization process. When served as an anode for PIBs, this FMS@NC demonstrates a high specific capacity (585 mAh g −1 at 0.05 A/g) and long cycling stability. Synergetic effects of mitigated volume expansions and enhanced conductivity that are responsbile for such high performance have been verified to originate from the heterostructured sulfides and the N -doped carbon matrix. Meanwhile, comprehensive characterization reveals existence of an intercalation-conversion hybrid K-ion storage mechanism in this material. Impressively, a K-ion capacitor with the FMS@NC anode and a commercial activated carbon cathode exhibits a superior energy density of up to 192 Wh kg −1 , a high power density, and outstanding cycling stability. This study provides constructive guidance for designing high-performance and durable potassium-ion storage anodes for next-generation energy storage devices.
研究领域:
材料科学
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能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2013
·Vol. 3
·期 17
·6132-6140
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IF 2.562
Jian Xia,Jiqing Jiao,Bilong Dai,Wenda Qiu,Shenxian He,Weitao Qiu,Peikang Shen,Liuping Chen
Metal sulfides have received growing attention as electrode materials for lithium ion batteries. However, large volume changes often cause a sharp decrease in capacity and thus leads to poor cycling performance. Here, we developed a facile hydrothermal process for preparation of FeS2 nanocrystals (NCs) with diameter ranging from 10 to 35 nm and tested them as anode materials for lithium-ion batteries. In comparison with FeS2 micro-particles, these FeS2 NCs show higher capacity, a more stable discharge plateau and better cycling performance. Moreover, we studied the magnetic properties of these FeS2 NCs in detail for the first time. The two as-prepared FeS2 NCs have completely different magnetic properties. FeS2 NCs prepared from Fe(acac)3 show antiferromagnetism at room temperature and exhibit weak paramagnetism at low temperature. However, when nano-Fe3O4 was used as the iron source, the synthesized products show ferromagnetic and paramagnetic behaviors which is due to the formation of a trace amount of pyrrhotite in the main phase. Our results indicate that detection of the trace amount of impurity in the main FeS2 phase by traditional methods such as XRD, EDS, XPS and even room-temperature Mössbauer spectroscopy is ineffective, and that magnetic measurements alone are reliable.
研究领域:
材料科学
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纳米科技
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电化学
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能源存储
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磁学
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2021
·
IF 10.588
Xia Li,Jie He,Jian Lu,Yi Zhou,Yanbo Zhou
Fenton technology performs well in high-risk roxarsone (ROX) removal, but it is limited by the high H 2 O 2 transportation and storage risks. Herein, FeS 2 decorated resorcinol-formaldehyde resins (FeS 2 -RFR) were successfully prepared to in-situ produce and utilize H 2 O 2 for efficient removal of ROX. Under solar light illumination, resorcinol-formaldehyde resins (RFR) efficiently generated a high concentration of H 2 O 2 , with a yield of 500 μmol g −1 h −1 . FeS 2 can in-situ decompose H 2 O 2 to generate · OH, participating in the oxidation of ROX. As a result, the FeS 2 -RFR catalyst degraded more than 97% of ROX within 2 h and ROX was selectively degraded into low-toxic As(V), which can be simply removed by traditional adsorption or precipitation processes. During the degradation of ROX, · OH played a dominant role. Moreover, the cations (Na + , K + , and Ca 2+ ), anions (SO 4 2− , Cl − ), and humic acid had no noticeable inhibition effect on ROX removal. Furthermore, FeS 2 -RFR can still remove 70% of ROX even after three cycles, proving that this in-situ photo-Fenton system exhibited stability. This study innovatively proposed a double-active site FeS 2 -RFR photocatalyst for in-situ production and activation of H 2 O 2 and showed a sustainable and eco-friendly way for organoarsenic compounds degradation.
研究领域:
环境科学
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化学工程
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材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Wutao Wei,Xi Jia,Xuyan Qin,Zhikai Wang,Yide Zhang,Fang He,Liwei Mi
Magnesium/lithium-sulfur hybrid batteries (ML-SHBs) are considered to be the strongest candidate to replace lithium-ion batteries (LIBs) due to their high volumetric energy density and dendrite-free. In this study, S@FeS 2 /CoS 2 was prepared on the basis of a hollow, eggshell-shaped construction by using the less-liquid method. In this method, the reactants carry water of crystallization during the reaction to provide a liquid environment, and the metal ions on the surface of the droplets promote the formation of S@FeS 2 /CoS 2 . The configuration of the eggshell facilitates the generation of additional reaction interfaces, thereby expediting the interaction with the electrolyte and facilitating transport processes. This structure promotes efficient charge transfer and accelerates the transport rate. By implementing strategies such as heterostructure building and bimetallic doping, the controllable construction of the morphological structure can be realized. The induced effect of heterostructured interfaces can be excited within the nanocrystals to form an electric field, which effectively reduces the ion diffusion barrier and synchronously enhances the interfacial electron transfer efficiency by modulating the electronic behavior. The discharge specific capacity of the cell was found to be 1096.73 mAh g −1 at a current density of 200 mA g −1 , exhibiting a high rate capacity. The Coulombic efficiency remained at 99.8 % after 100 cycles at a current density of 500 mA g −1 .
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DOI
高影响因子
Materials
·
2019
·Vol. 12
·期 20
·3364
·
IF 2.972
Kefeng Pan,Yingying Zhai,Jiawei Zhang,Kai Yu
Electrolytic water splitting with evolution of both hydrogen (HER) and oxygen (OER) is an attractive way to produce clean energy hydrogen. It is critical to explore effective, but low-cost electrocatalysts for the evolution of oxygen (OER) owing to its sluggish kinetics for practical applications. Fe-based catalysts have advantages over Ni- and Co-based materials because of low costs, abundance of raw materials, and environmental issues. However, their inefficiency as OER catalysts has caused them to receive little attention. Herein, the FeS2/C catalyst with porous nanostructure was synthesized with rational design via thein situelectrochemical activation method, which serves as a good catalytic reaction in the OER process. The FeS2/C catalyst delivers overpotential values of only 291 mV and 338 mV current densities of 10 mA/cm2and 50 mA/cm2, respectively, after electrochemical activation, and exhibits staying power for 15 h.
研究领域:
材料科学
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电化学
·
纳米科技
·
能源化学
·
催化化学
✓ 已验证
DOI
高影响因子
Joule
·
2023
·
IF 39.8
Zhendong Li,Ge Zhou,Shuai Li,Hongyu Liu,Liping Wang,Hong Li
Conversion-type cathodes for lithium metal batteries are considered long-term targets due to their low cost and high energy density. However, they suffer from poor cycling life. In this study, we present an interface engineering strategy that involves constructing a three-dimensional (3D) ionic-electronic network to overcome this challenge. In detail, we fabricate a cathode-electrolyte interphase (CEI) as an ionic conductor using a specially designed localized high-concentration electrolyte (LHCE). Additionally, we construct a durable electronic network by applying a functional binder and carbon nanotubes (CNTs) onto the surface of the active material. We demonstrate that micro-sized FeS 2 cathode achieves a capacity retention of 72.6% after 700 cycles at a current rate of 0.5 C and 4 mAh/cm 2 . This work addresses the construction of a stable ionic-electronic network that is key to achieving stable performance. Moreover, it reveals the potential of conversion cathodes, even in micro-size, for practical applications.
研究领域:
材料科学
·
电化学
·
能源存储
·
锂金属电池
·
纳米材料
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界面化学
·
固态离子学
✓ 已验证
DOI
高影响因子
Materials
·
2025
·Vol. 18
·期 17
·4058
·
IF 3.2
Fan Zhang,Qiang Lu,Jiachen Li,Qiongyue Zhang,Haotian Yu,Yahao Wang,Jinrui Li,Haodong Ren,Huirong Liang,Fei Shen,Xiaogang Han
Lithium–iron disulfide (Li-FeS2) batteries are plagued by the polysulfide shuttle effect and cathode structural degradation, which significantly hinder their practical application. This study proposes a dual-strategy design that combines a polyacrylonitrile–carbon nanotube (PAN-CNT) composite cathode and a polyvinylidene fluoride (PVDF)-conductive carbon-coated separator to synergistically address these bottlenecks. The PAN-CNT binder establishes chemical anchoring between polyacrylonitrile and FeS2, enhancing electronic conductivity and mitigating volume expansion. Specifically, the binder boosts the initial discharge capacity by 35% while alleviating the stress-induced pulverization associated with volume changes. Meanwhile, the PVDF-conductive carbon-coated separator enables effective polysulfide trapping via dipole–dipole interactions between PVDF’s polar C-F groups and Li2Sxspecies while maintaining unobstructed ion transport with an ionic conductivity of 1.23 × 10−3S cm−1, achieving a Coulombic efficiency of 99.2%. The electrochemical results demonstrate that the dual-modified battery delivers a high initial discharge capacity of 650 mAh g−1at 0.5 C, with a capacity retention rate of 61.5% after 120 cycles, significantly outperforming the control group’s 47.5% retention rate. Scanning electron microscopy and electrochemical impedance spectroscopy confirm that this synergistic design suppresses polysulfide migration and enhances interfacial stability, reducing the charge transfer resistance from 26 Ω to 11 Ω. By integrating polymer-based functional materials, this work presents a scalable and cost-effective approach for developing high-energy-density Li-FeS2batteries, providing a practical pathway to overcome key challenges in their commercialization.
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产品关联
DOI
PubMed
高影响因子
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