RARE METALS
·
2021
·Vol. 40
·期 9
·2455-2463
·
IF 4.003
Jia Xin-Xin,Yu Xin-Zhi,Lu Bing-An
Potassium-selenium (K-Se) batteries are a promising electrical energy storage candidate because of the cost-effectiveness and material sustainability, yet they suffer from shuttle effect, volume expansion and low powder density. The development of Se-based cathode is an effective way to overcome the above issues. Here we designed a hollow nano-spherical Co-Fe bi-metallic selenide coated with N-doped carbon (denoted as CFS@N-C) as cathode for K-Se batteries. Bimetallic selenide is benefit to improve the conductivity of composite materials; N-doped carbon layer encapsulation effectively inhibits the dissolution of poly-selenides and relieves the volume expansion. The as-prepared K-Se battery exhibits excellent rate performance (300 mAh·g –1 at 1000 mA·g –1 ) and slow-charge/ultrafast-discharge capability (discharge at 5000 mA·g –1 and charge at 100 mA·g –1 with ultrahigh capacity of 227 mAh·g –1 ) with Coulombic efficiency nearly 100%. In addition, the ex-situ high-resolution transmission electron microscopy (HRTEM) images reveal that the charge–discharge mechanism of CFS@N-C is K + replaces the bimetal and forms K 2 Se. The unique design in this work may provide certain directions on researching for high power density K-storage materials.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米材料
·
电池技术
✓ 已验证
DOI
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2023
·
IF 6.9
Haoyu Xu,Yuzhou Sun,Zhou Shen,Qing Zhou,Qingyun Zhu,Haifeng Gao,Chao Gao,Xiaoyun Teng,Yu Wei
In this paper, we prepared Na–K co-doped Cu 2 ZnSn(S,Se) 4 (CZTSSe) films by solution method. By optimizing the distribution of the K-doping (uniform or localized K-doping) in the precursor films, the efficiencies of CZTSSe solar cells were improved. The effect of the K-doping distribution on the properties of CZTSSe films and solar cells were investigated. Compared to the solar cells without K-doping, the uniform K-doping in the precursor film increased the solar cell efficiency from 10.4% to 11.7%. In comparison, the localized K-doping in the bottom and in the top of the precursor films yielded solar cells with efficiencies of 12.4% and 10.1%, respectively. It was determined that the K-doping distribution primarily had an influence on carrier recombination in the depletion regions of CZTSSe solar cells. Whereas k-doping at the top of the precursor film greatly enhances the carrier recombination in the depletion region, the bottom doping has the opposite effect. The reason could be that the variation of the K-doping distribution modified the crystallization of the CZTSSe films. As the result, the defect properties of the CZTSSe films were altered. Moreover, the effect of the bottom K-doping on the back contact properties of CZTSSe solar cells was investigated by impedance spectroscopy . Though the K-doping can reduce the back contact barrier of the solar cell, the back contact barrier still achieved the height of 228 meV. The results indicated that the back contact barrier would be an important limiting factor for the efficiency of CZTSSe solar cell.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
CATALYSIS LETTERS
·
2024
·Vol. 154
·期 8
·4618-4624
·
IF 2.3
Zheng Xiaoxia,Wang Yinwei,Feng Xiao,Cao Jieqi,Gong Xinbin,Yu Weiqiang,Wang Xinhong,Shi Song
Heterogeneous solid base catalysts have attracted widespread attention for various reactions from the perspective of green and economy chemistry due to their advantages such as low corrosiveness, high reaction efficiency, and easy separation. The unique properties of polyacrylonitrile fibers (PANF) such as good mechanical strength and a surface rich in cyanine and economy make them suitable catalytic supports. Herein, potassium oxide was introduced into PANF by redox strategy. Characterization using XRD, FT-IR, solid-state 13 C NMR, XPS, SEM, CO 2 -TPD, etc. confirmed the successful preparation of this heterogeneous base catalyst and the participation of PANF in the redox process of KNO 3 to promote the decomposition of KNO 3 . The acquired catalyst showed obvious activity for the oxidation of methylene compounds and the yield of fluorenones can reach 100% at 100 °C. This strategy provides a new development path for the application of PANF and the synthesis of heterogeneous bases. Graphical Abstract
研究领域:
催化化学
·
绿色化学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Ruifeng Wan,Hongfei Zhang,Linsheng Sheng,Peng Zheng,Xuyu Liu,Hailiang Wang,Qiaolan Fan,Liang Zheng,Wangfeng Bai,Yang Zhang
Relaxor ferroelectric ceramics are extremely encouraging materials for energy storage capacitor applications in pulse equipment. As the second largest ferroelectric ceramic system, tungsten bronze structure relaxor ferroelectric ceramics have emerged as a significant contender and garnered significant attention in the pulse capacitor research field. In this work, an Sb-modified Sr 2 KNb 5 O 15 -based tungsten bronze relaxor ferroelectric ceramic system is designed to explore its energy storage potential. XRD refinement reveals the declines in the oxygen octahedra tilting and distortion after the introduction of Sb, which significantly augments the relaxation behavior. Additionally, refined grain size and reduced oxygen vacancy concentration are observed, greatly improving the breakdown strength . Consequently, a superior energy storage density (∼4.57 J/cm 3 ) accompanied by wonderful energy storage efficiency (∼89.3 %) is received at 540 kV/cm, with wide frequency stability and great thermal stability. Moreover, amazing discharging performances are also achieved with rapid discharge speed ( τ 0.9 < 70 ns), towering discharge current density (815.2 A/cm 2 ) and surprising power density (130.4 MW/cm 3 ). All these performances indicate that the designed Sr 2 KNb 5 O 15 -based tungsten bronze relaxor ferroelectric ceramic can be one encouraging option in the dielectric energy storage field.
研究领域:
材料科学
·
电介质物理
✓ 已验证
DOI
高影响因子
Small
·
2021
·Vol. 18
·期 8
·2104296
·
IF 13.281
Shaokun Chong,Lingling Yuan,Ting Li,Chengyong Shu,Shuangyan Qiao,Shihong Dong,Zhengqing Liu,Jing Yang,Hua Kun Liu,Shi Xue Dou,Wei Huang
The investigation of carbonaceous-based anode materials will promote the fast application of low-cost potassium-ion batteries (PIBs). Here a nitrogen and oxygen co-doped yolk-shell carbon sphere (NO-YS-CS) is constructed as anode material for K-ion storage. The novel architecture, featuring with developed porous structure and high surface specific area, is beneficial to achieving excellent electrochemical kinetics behavior and great electrode stability from buffering the large volume expansion. Furthermore, the N/O heteroatoms co-doping can not only boost the adsorption and intercalation ability of K-ion but also increase the electron transfer capability. It is also demonstrated by experimental results and DFT calculations that K-ion insertion/extraction proceeds through both intercalation and surface capacitive adsorption mechanisms. As expected, the NO-YS-CS electrodes show high initial charge capacity of 473.7 mAh g −1 at 20 mA g −1 , ultralong cycling life over 2500 cycles with the retention of 85.8% at 500 mA g −1 , and superior rate performance (183.3 mAh g −1 at 1.0 A g −1 ). The K-ion full cell, with a high energy density of 271.4 Wh kg −1 and an excellent cyclic stability over 500 cycles, is successfully fabricated with K 2 Fe[Fe(CN) 6 ] cathode. This work will provide new insight on the synthesis and mechanism understanding of high-performance hard carbon anode for PIBs.
研究领域:
材料科学
·
能源存储
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2020
·
IF 2.888
Minghui Xu,Valeri Smolenski,Qi Liu,Alena Novoselova,Kewei Jiang,Jing Yu,Jingyuan Liu,Rongrong Chen,Hongsen Zhang,Milin Zhang,Jun Wang
The interaction of oxygen and cerium-free ions in molten 3LiCl-2KCl eutectic in the temperature range of (723–823) K was studied by the method of potentiometric titration using YZME electrodes. Stable states of cerium compounds in the Ce–O system and the mechanism of interaction of Ce 3+ with O 2− ions have been established. The solubility constants of cerium oxychloride and oxide compounds at different temperatures were determined. Principal thermodynamic data of CeOCl and Ce 2 O 3 were calculated. The Pourbaix (potential-pO 2− ) diagram was drawn and summarizes the properties of stable cerium species in the melt.
研究领域:
化学
·
材料科学
✓ 已验证
DOI
高影响因子
Particuology
·
2015
·
IF 2.11
Rongjin Sun,Peiyu Qiu,Ting Yin,Guo Gao,Hualin Fu,Kan Wang,Chunlei Zhang,Daxiang Cui
Highly-dispersed BaLuF 5 :Yb 3+ /Er 3+ nanocrystals were prepared by a facile potassium sodium tartrate-assisted hydrothermal method. The average particle size was approximately 20–25 nm. The formation mechanism is discussed. Potassium sodium tartrate led to form a complex with an approximately three-dimensional network structure, which insured largely concurrent nucleation. As a result, we acquired uniform nanoparticles. The hydrothermal temperature, holding time, and pH value were important factors affecting the formation of the BaLuF 5 :Yb 3+ /Er 3+ nanocrystals. We investigated their influence on the formation and realized the optimal reaction parameters. Remarkably, potassium sodium tartrate also contributed to the biocompatibility and potential biomedical applications of BaLuF 5 :Yb 3+ /Er 3+ nanocrystals by decomposing into small organic groups attached to the nanoparticles.
研究领域:
材料科学
·
纳米医学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2019
·Vol. 31
·期 1
·572-580
·
IF 2.195
Zhou Hongming,Guan Hao,Yin Chengjie,Liu Bin,Li Jian
Li-rich layered oxide has drawn attention due to its high capacity, low cost and environmental friendliness. However, its application as cathode material of lithium ion battery is impeded by its poor rate and cycling performance. In this work, a K, Cl co-doped Li-rich layered cathode material Li 1.18 K 0.02 Ni 0.2 Mn 0.6 O 1.98 Cl 0.02 (LLO-KCl) was successfully synthesized via a rapid nucleation followed by hydrothermal method. The resulting LLO-KCl cathode material was investigated using X-ray diffraction, scanning electron microscopies, X-ray photoelectron spectroscopy, cyclic voltammetry, electrochemical impedance spectroscopy, and charge/discharge tests. For comparison, Li 1.2 Ni 0.2 Mn 0.6 O 2 (LLO) samples were prepared under the same condition. LLO-KCl delivered the initial discharge capacity of 265.1 mAh g −1 at a rate of 0.1 C and the capacity retention of 88.4% at 1 C after 100 cycles. Even at the rate of 10 C, the specific capacity was 98.9 mAh g −1 . The enhanced electrochemical performance was mainly benefited from expanded Li + migration path and stabilized crystal lattice via K + and Cl − simultaneously doped into crystal structure. This finding provides a strategy to explore a cathode material to build high specific battery systems.
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Yu Lei,Yenchi Chen,Huwei Wang,Junyang Hu,Da Han,Jiahui Dong,Wenxin Xu,Xiaojing Li,Yuxin Wang,Yiying Wu,Dengyun Zhai,Feiyu Kang
Nowadays, alkali metal-oxygen batteries such as Li-, Na-, and K-O2 batteries have been investigated extensively because of their ultrahigh energy density. However, the oxygen crossover of oxygen batteries and the intrinsic drawbacks of the metal anodes (i.e., large volume changes and dendrite issues) have still been unsolved key problems. Here, we demonstrate a novel design of the K-ion oxygen battery using a graphite intercalation composite as the anode in a highly concentrated ether-based electrolyte. Instead of the metal K anode, the potassium graphite intercalation compound as the anode is depotassiated/potassiated in a binary form below 0.3 V (vs. K+/K); correspondingly, the discharged product KO2 is formed/decomposed at the carbon nanotube cathode, and an all-carbon full cell exhibits impressive cycling stability with a working voltage of 2.0 V. Furthermore, the utilization of graphite intercalation chemistry has been demonstrated to be applicable in Li-O2 batteries as well. Therefore, this study may provide a new strategy to resolve the key problems of the alkali metal-oxygen batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF CATALYSIS
·
2022
·
IF 8.047
Yuan Liang,Shaoxiang Xu,Meihua Zhu,Jiamin Jiang,Jiao Zhang,Goubing Zhou,Na Hu,Xiangshu Chen,Hidetoshi Kita
In the absence of boric acid, the tubular Ti-MWW zeolite membranes are prepared with dual organic template agents and potassium carbonate by secondary hydrothermal synthesis. 12MR cage and 10 MR of the MWW zeolite topology structure is stabilized by TMAdaOH and HMI organic template agents, K + cations is a critical mineralization agent for preparing Ti-MWW zeolite membrane with bi-layer Ti-MWW zeolites layer in this work. Besides, ion-exchange could greatly improve the catalytic performance of the Ti-MWW zeolite membrane for phenol hydroxylation with H 2 O 2 , influences of ammonium salt, ion-exchange time and temperature on the micro-structure and catalytic performance are investigated. The upper network-like Ti-MWW zeolite layer could be dissolved and removed by ion-exchange with 0.5 M (NH 4 ) 2 SO 4 solution at 60 °C for 24 h, and the “lying” Ti-MWW zeolites layer is kept on the mullite support. On the other hand, ion-exchange could promote the transformation of hexacoordinated extra-framework titanium species to tetracoordinated state in the framework, part of K + cations of Ti-MWW zeolites are replaced with NH 4 + cations. Total flux and phenol conversion of the ion-exchanged Ti-MWW zeolite membrane are 14.89 kg·m −2 ·h −1 and 36.49 % for phenol hydroxylation by H 2 O 2 at 50 °C.
研究领域:
材料科学
·
催化化学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Yaping Yan,Dongbin Xiong,Bingbing Tian,Lifu Zhang,Yan-Fang Zhu,Jian Peng,Shao-Wei Chen,Yao Xiao,Shu-Lei Chou
Improving the electrochemical kinetics and the intrinsic poor conductivity of transition metal dichalcogenide (TMD) electrodes is meaningful for developing next-generation energy storage systems. As one of the most promising TMD anode materials, ReS2 shows attractive performance in potassium-ion batteries (PIBs). To overcome the poor kinetic ion diffusion and limited cycling stability of the ReS2-based electrode, herein, the interlayer distance expanding strategy was employed, and reduced graphene oxide (rGO) was introduced into ReS2. Few-layered ReS2 nanosheets were grown on the surface of the rGO with expanded interlayer distance. The prepared ReS2 nanosheets show an expanded distance (∼0.77 nm). The synthesized EI-ReS2@rGO composites were used in PIBs as anode materials. The K-ion storage mechanism of the ReS2-based anode was investigated by in situ X-ray diffraction (XRD) technology, which shows the intercalation and conversion types. The EI-ReS2@rGO nanocomposites show high specific capacities of 432.5, 316.5, and 241 mAh g–1 under 0.05, 0.2, and 1.0 A g–1 current densities and exhibit excellent reversibility at 1.0 A g–1. Overall, this strategy, which finely tunes the local chemistry and orbital hybridization for high-performance PIBs, will open up a new field for other materials.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Zhentao Bian,Guangzhen Zhao,Long Chao,Chengcheng Liu,Mingkun Zhao,Hongyan Wang,Yong Xie,Guang Zhu,Chong Chen
Due to the unique physicochemical properties, heteroatom doping of porous carbon has attracted wide attention. However, the complicated synthesis process and high cost limit its mass production. In this work, nitrogen and oxygen co-doped porous carbon materials (N-O-PCMs) derived from pine mushroom (PM) were prepared using a “one-step” carbonization and activation approach with potassium hydroxide (KOH) as active agent and at different PM/KOH mass ratios. The as-prepared hierarchical porous carbon materials are shown to not only contain rich N and O species, but also have an appropriate mesopore ratio and a narrow mesopore size distribution. Among all samples, the sample N-O-PCM -3 exhibits the largest specific surface area (935.8 m2 g −1 ), greatest total pore volume (0.56 cm 3 g −1 ), highest content of oxygen (20.1 at.%) and nitrogen (4.9 at.%) as well as optimal hierarchical porous structure. The N-O-PCMs were tested in two electrode systems using 1 M Na 2 SO 4 aqueous electrolyte. N-O-PCM -3 shows an energy density of up to 35.9 Wh kg −1 at 360 W kg −1 and an outstanding long-term stability (89.7 % after 10,000 cycles). This work proposes a facile and low-cost method for synthesizing multiple heteroatom-doped hierarchical porous carbon for supercapacitors.
研究领域:
材料科学
·
能源存储
·
环境科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）