ANALYST
·
2013
·Vol. 139
·期 5
·1016-1022
·
IF 3.969
Jiarun Tu,Wensheng Cai,Xueguang Shao
Enhancing the sensitivity of analytical methods by improving the signal quality is a universal goal in analytical chemistry. In analytical electrochemistry systems, the double layer charging current has been an obstacle to the accurate measurement of the faradaic current despite theoretical and experimental efforts. In this study, a method for sensitivity enhancement for potential step voltammetry is developed using chemometric resolution. Trilinear decomposition is used to extract the net faradaic current and double layer charging current directly from the data matrix of the decaying curves measured at different potentials. The feasibility of the method is proven using simulated data and further validated by two experimental datasets of diffusion and adsorption control reactions. Compared with the conventional approach that records the current data at a later pulse time, the voltammogram of the extracted net faradaic current is an ideal sigmoid curve with a horizontal baseline, even for the samples of very low concentration. More importantly, the analytical sensitivity can be greatly improved when the net faradaic current is used for quantitative determination.
研究领域:
分析化学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF POWER SOURCES
·
2018
·
IF 6.945
Haoqing Lin,Peng liu,Shaofeng Wang,Zhenbao Zhang,Ziyang Dai,Shaozao Tan,Dengjie Chen
Perovskite LaMnO 3 is reported to be a superior electrocatalyst for oxygen reduction reaction in terms of the onset potential and intrinsic activity. However, traditionally prepared LaMnO 3 is characterized to exhibit a low specific surface area and a limited pore volume . Herein, we synthesize a three-dimensional ordered macroporous LaMnO 3 that features ordered and interconnected porous structure , in order to increase catalytic sites. The obtained three-dimensional ordered macroporous LaMnO 3 exhibits an increased specific surface area of 20.328 m 2 g −1 and pore volume of 0.126 cm 3 g −1 . Rotating-ring-disk electrode measurement reveals a more positive onset potential (0.827 V) and half-wave potential (0.686 V), and a much higher current-limited density (5.90 mA cm −2 ) of the three-dimensional ordered macroporous LaMnO 3 compared to counterparts, as well as a high electron transfer number (∼4) and a better stability. Furthermore, a Li O 2 battery employing the three-dimensional ordered macroporous LaMnO 3 as air electrode exhibits excellent electrochemical performance with a higher initial discharge capacity (5592 mAh g −1 ), a smaller discharge-charge voltage gap (1.56 V), and a higher coulombic efficiency (∼100%) in comparison with the carbon electrode. Our results suggest that traditional perovskite oxides could be effectively optimized for efficient electrocatalytic reactions .
研究领域:
材料科学
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电化学
·
能源存储
✓ 已验证
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2022
·
IF 4.598
Fangxu Hu,Yuanyuan Ren,Langlang Chen,Yijin Sheng,Cheng Zheng,De Li,Yong Chen
The electrochemical oscillation of Li-ion batteries is a novel electrochemical phenomenon, which has been discovered in two-phase materials of Li 4 Ti 5 O 12 and LiCrTiO 4 . To analyze the electrochemical oscillation in this work, a three-electrode coin cell was designed and assembled with a specialized reference electrode, based on the conventional two-electrode coin cell. In the three-electrode coin cell, a Li-deficient Li 4 Ti 5 O 12 material exhibits a distinct electrochemical oscillation during the galvanostatic charge process, and its electrochemical kinetics was studied by in-situ electrochemical impedance spectroscopy (EIS). Compared with two other Li 4 Ti 5 O 12 materials without electrochemical oscillation, the Li-deficient Li 4 Ti 5 O 12 material had an evidently larger resistance of the SEI layer (R sei ) and charge transfer resistance (R ct ) in the EIS spectra. When the electrochemical oscillation emerged, the Warburg impedance (W s ) dramatically transformed into the capacitive impedance in the EIS spectra, indicating that the intraparticle phase separation had been replaced by the interparticle phase separation. This study further confirmed the reaction process of electrochemical oscillation proposed in our previous work, so as to finally reveal the underlying mechanism of this novel phenomenon.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Journal of Advanced Dielectrics
·
2023
·
IF 3.1
Hailan Qin,Jianwei Zhao,Xiaoxin Chen,Hongtian Li,Shenghao Wang,Yuxiao Du,Peifeng Li,Huanfu Zhou,Dawei Wang
BiFeO 3 –BaTiO 3 is a promising lead-free piezoelectric ceramic, exhibiting high Curie temperature and superior electrochemical characteristics. In this work, ( 1 − x ) BiFeO 3 – x BaTiO 3 (BF– x BT, x = 0 . 2 6 , 0.28, 0.30, 0.32, 0.34, 0.36) ceramics were fabricated using the conventional solid-state reaction method through precise composition control. Multiple characterization techniques, including X-ray powder diffraction (XRD), scanning electron microscope (SEM), and electrical property testing systems, were applied to systematically examine the crystallographic structure, microstructure, as well as the dielectric, ferroelectric and piezoelectric properties of the BF– x BT ceramics. The XRD results confirm that all compositions exhibit a typical perovskite structure, transitioning from a single rhombohedral phase to a rhombohedral–cubic phase mixture as the BT content increases. SEM shows apparent core–shell microstructures in the ceramics. Notably, the results demonstrated that the BF–0.30BT ceramic exhibits the maximum piezoelectric constant ( d 3 3 ) ∼ 2 1 7 pC/N, while the BF–0.34BT ceramic displays the maximum converse piezoelectric constant ( d 3 3 ∗ ) ∼ 3 2 3 pm/V, which highlights the suitability of BF–BT ceramics for high-performance piezoelectric applications.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2025
·
IF 7.9
Shiheng Liu,Yizhuo Li,Jie Zhu,Jingyi An,Ruida Zhao,Youlong Xu
The rapid advancement of artificial intelligence (AI) technology is creating new requirements for supply voltage stability and power conversion efficiency, necessitating electrolytic capacitors with conductive polymer cathode films. A study examines how different doping anions, pH levels, and current densities affect the constant-current electropolymerization of poly(3,4-ethylenedioxythiophene) (PEDOT) on poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) substrates. Highly doped PEDOT films with smooth surfaces and a conductivity of 313 S cm −1 are obtained at pH 2 and 0.5 mA cm −2 using dodecyl benzene sulfonate (DBS − ) as a doping anion. A PEDOT:PSS conductive substrate is created on the dielectric surface of anodized aluminum foil. Low current density and then high current density electropolymerization of PEDOT cathodes on substrate allow for more efficient capacitors with high capacitance and low leakage current. Based on this, the chip capacitor is obtained with a capacitance of 80 μF cm −2 level, a loss of 0.65 % at 100 Hz, an equivalent series resistance (ESR) of 4.16 mΩ at 100 kHz, and a leakage current of 0.8 μA at 16 V. This work is significant for the research of ultra-low loss and ESR chip aluminum solid electrolytic capacitors.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Yini Yan,Tianqi Yang,Menglu Lu,Yongquan Zheng,Qingru Zhou,Wenkui Zhang,Yang Xia,Hui Huang,Xinhui Xia,Yao Wang,Xinyong Tao,Jun Zhang
The design of an oxidation-resistant electrolyte is crucial for achieving a high-voltage sodium metal battery (SMB) system. However, traditional ester-based electrolyte systems demonstrate limitations in oxidative stability and interfacial compatibility with both high-voltage cathode materials and sodium metal anodes. Herein, we propose a novel sulfolane (SL)-based electrolyte that incorporates a film-forming co-solvent fluoroethylene carbonate and low-viscosity dimethyl carbonate as diluent co-solvent. This innovative design not only broadens the electrochemical window of the electrolyte, but also promotes the formation of a unique weakly-solvated structure. Therefore, the electrolyte can induce in-situ formation of high-quality cathode electrolyte interphase and solid electrolyte interphase on electrodes during battery cycling, along with faster Na + transport kinetics. Consequently, the designed electrolyte achieves a high Coulombic efficiency of 97.9% in Na||Cu cells and a substantial lifespan of 1000 h in Na||Na symmetric cells. Furthermore, Na||Na 3 V 2 (PO 4 ) 2 O 2 F cells exhibit a capacity retention of 93.6% after 300 cycles at a high cut-off voltage of 4.5 V. This study provides valuable insights into the future design of SL-based weakly solvated electrolytes for high-voltage SMBs.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Yujing Liu,Qi Liu,Xin Zhou,Xiaohui Liu,Mingyue Li,Zhongqiu Liu,Anguo Ying
Improving the voltage window of aqueous supercapacitors beyond 2.5 V without diminishing their capacitance performance is a big challenge to achieve excellent energy density because of the undesirable water decomposition. Herein, this study developed a novel vanadium phosphate (VPO) of the VO(PO 3 ) 2 aerogel as the electrode to enlarge the device voltage, which could effectively raise HER/OER overpotentials and thus achieving a stable wide electrochemical window of −1 ∼ 1 V (vs. SCE) with remarkably improved capacitance. The VPO microstructure is organized by nanowire-stacked lamellar bricks via engineering a controllable phase-transformation using the V-P-citric acid-aerogel as the precursor. Examined as the supercapacitor electrode, in-situ X-ray powder diffraction analysis uncovers that the VO(PO 3 ) 2 undergoes a reversible phase-transformation reaction associated with Na + intercalation/de-intercalation in Na 2 SO 4 and a typical redox pseudocapacitance process in KOH. For the first time, a 2.8 V symmetric aqueous supercapacitor was further assembled with an energy density of 123.1 Wh kg −1 at the power density of 580 W kg −1 , which is much superior to those of all reported V-base supercapacitors. The underlying mechanisms of the VO(PO 3 ) 2 on ultrahigh voltage window and charge storage are further elucidated, which provide the fundamental guidance for structuring VPO-based electrodes used for commercial energy storage devices.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
Small
·
2025
·
IF 12.1
Zhuang-zhuang Zhou,Meng-meng Li,Ning Wei,Zheng Sun,Hao Liu,Jia-Cheng Feng,Xu Xia,Bing-jie Li,Hong Xia
Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) hydrogel are promising for applications in electromagnetic interference (EMI) shielding, energy storage, and electrochromic (EC) devices. However, challenges such as low conductivity at reduced solid content, limited charge storage, poor mechanical properties, and structural distortion during solvent treatment limit their high-performance applications. To address these issues, a high-fidelity, high-conductivity and multifunctional PEDOT:PSS hydrogel is developed by an ice crystal-assisted skeleton stacking and stepwise treatment strategy, achieving ultrahigh conductivity of 87,249 S m −1 at 5.8 wt% solid content. The PEDOT:PSS hydrogel also features a charge storage capacity of 35.66 mC cm −2 and a capacitance density of 587.6 mF cm −2 . Additionally, The PEDOT:PSS hydrogel demonstrates exceptional EMI shielding effectiveness, achieving 81.2 dB, and also exhibits an ultrahigh specific surface shielding efficiency of 30,769.23 dB cm 2 g −1 . Notably, The PEDOT:PSS maintains high EMI shielding stability even after undergoing various harsh conditions. Using femtosecond laser direct writing, the highly stable all-solid-state EC reflective displays are developed with ultrafast response (<0.3 s) and superior durability.
研究领域:
材料科学
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电子工程
·
能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
·
2020
·Vol. 217
·期 8
·1900806
·
IF 1.759
Jingbo Li,Yu Liu,Fang Xu,Junping Hu,Nan Chen,Guoping Du,Changshuang Jiang
As a 2D material, Ti 3 C 2 (MXene) has been recently used as electrodes for electrochemical capacitors. Herein, a two-step procedure is used to obtain a highly opened layer structure for Ti 3 C 2 , which differs from the methods used in the literature for synthesizing exfoliated MXene. First, the mild NH 4 HF 2 etching agent is used to prepare the regular Ti 3 C 2 MXene. Second, KOH is added into the obtained solution for K + to intercalate the MXene. The K + intercalation is found to greatly increase the (002) crystal planar spacing of the Ti 3 C 2 from 10.8 to 12.4 Å. More importantly, this K + -intercalated MXene exhibits a highly opened layer structure, whereas the regular MXene only has a partially opened layer structure. Consequently, the former is expected to allow much more active sites exposed to liquid electrolyte, and also facilitates remarkably higher ion and electron transport efficiency. To investigate their electrochemical capacitance properties, the regular and K + -intercalated Ti 3 C 2 MXenes are used to fabricate binder-free electrodes on nickel foams by an electrophoretic deposition method. The K + -intercalated MXene-based electrode is found to have twice higher specific capacitance than the regular MXene. Furthermore, the K + -intercalated Ti 3 C 2 MXene-based electrode exhibits an excellent cyclic stability.
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 Energy Materials
·
2021
·Vol. 11
·期 33
·2101156
·
IF 29.368
Ding-Rong Deng,Ru-Ming Yuan,Pei-Kai Yu,Fei Xue,Xiao-Xiang Fan,Jie Lei,Jie-Ling Zhang,Xiao-Dong Lin,Qi-Hui Wu,Jing-Min Fan,Jeng-Kuei Chang,Wen-Jing Hong,Ming-Sen Zheng,Quan-Feng Dong
An electron conductive matrix, or collector, facilitates electron transport in an electrochemical device. It is stationary and does not change during the entire operation once it is built. The interface of this matrix and an electrode is constructed at a 2D level at the micro-scale, and naturally limits the breadth and depth of electrochemical reactions. Herein, the idea of an enhanced electrode coupled with a conducting molecule that can extend interfacial reactions is first introduced. With a spatialized interspace, this electrode can change the present understanding of the electrode process and opens up a new realm of electrode-based reaction chemistry. A lithium–sulfur (Li–S) battery is used as the target for implementing the enhanced electrode owing to the complex multi-electron reaction. Through the interaction of π–π stacking between graphite-based carbon and iron (II) phthalocyanine (FePc), soluble FePc can be decorated on the surface of an electrode that has the capability of transporting electrons. The scanning tunneling microscope break junction characterization and density functional theory indicate that FePc has a strong molecular electronic conductivity. The reactants obtain electrons more easily from the conducting molecule than from the collector directly. As a result, the performance of the corresponding Li–S battery considerably improves.
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
Nature Communications
·
2023
·Vol. 14
·期 1
·1-11
·
IF 16.6
Zhang Xiangyong,Wei Hua,Li Shizhen,Ren Baohui,Jiang Jingjing,Qu Guangmeng,Lv Haiming,Liang Guojin,Chen Guangming,Zhi Chunyi,Li Hongfei,Liu Zhuoxin
Aqueous copper-based batteries have many favourable properties and have thus attracted considerable attention, but their application is limited by their low operating voltage originating from the high potential of copper negative electrode (0.34 V vs. standard hydrogen electrode). Herein, we propose a coordination strategy for reducing the intrinsic negative electrode redox potential in aqueous copper-based batteries and thus improving their operating voltage. This is achieved by establishing an appropriate coordination environment through the electrolyte tailoring via Cl − ions. When coordinated with chlorine, the intermediate Cu + ions in aqueous electrolytes are successfully stabilized and the electrochemical process is decoupled into two separate redox reactions involving Cu 2+ /Cu + and Cu + /Cu 0 ; Cu + /Cu 0 results in a redox potential approximately 0.3 V lower than that for Cu 2+ /Cu 0 . Compared to the coordination with water, the coordination with chlorine also results in higher copper utilization, more rapid redox kinetics, and superior cycle stability. An aqueous copper-chlorine battery, harnessing Cl − /Cl 0 redox reaction at the positive electrode, is discovered to have a high discharge voltage of 1.3 V, and retains 77.4% of initial capacity after 10,000 cycles. This work may open up an avenue to boosting the voltage and energy of aqueous copper batteries.
研究领域:
电化学
·
材料科学
·
电池技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
npj 2D Materials and Applications
·
2024
·Vol. 8
·期 1
·1-6
·
IF 9.1
Cui Yuanyuan,Wang Tingjun,Hu Deng,Wang Zhiwei,Hong Jiawang,Wang Xueyun
2-dimensional (2D) piezoelectric materials have gained significant attention due to their potential applications in flexible energy harvesting and storage devices. Recently, niobium oxide dihalides NbOI 2 stands out as a multifunctional anisotropic semiconductor family with an exceptionally high lateral piezoelectric constant (~21.8 pm/V), making it a promising candidate for energy conversion applications. Here we report the experimental observation of anisotropic in-plane piezoelectricity in multilayer NbOI 2 . Current-voltage relationships reveal a significant piezotronic effect in two typical crystalline orientations. Additionally, cyclic tensile and release experiments demonstrate an intrinsic current output of up to 140 pA when subjected to a tensile strain of 0.51%. A flexible piezoelectric nanogenerator prototype is demonstrated on the human finger and wrist, which opens up new avenues for the development of wearable electronic devices and provides valuable insights for further exploration in this field.
研究领域:
材料科学
·
纳米技术
·
能量收集
·
可穿戴技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）