Asia-Pacific Journal of Chemical Engineering
·
2022
·Vol. 18
·期 1
·e2841
·
IF 1.777
Chunxiang Ma,Xiaoning Wang,Yijun Song,Haoyu Hu,Wei Li,Zhijian Qiu,Yongpeng Cui,Wei Xing
LiFePO 4 is one of the most widely used cathode materials for lithium-ion batteries, and the low-temperature performance of LiFePO 4 -based batteries has been widely studied in recent years. Herein, a 3.5 Ah pouch-type full battery was assembled using LiFePO 4 as the cathode and artificial graphite as the anode. For the LiFePO 4 -based cathode, carbon-coated aluminum foil was selected as the current collector, and a 0D–1D–2D multi-scale conductive network was introduced into the electrode. Notably, both the carbon-coated current collector and novel conductive network could significantly reduce the internal resistance of the LiFePO 4 -based battery, thus improving its electrochemical dynamics and low-temperature performance. This paper provides a theoretical basis for the development of low-temperature LiFePO 4 -based batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 20
·12331-12339
·
IF 12.732
Titao Jing,Bingang Xu,John H. Xin,Xiaoyang Guan,Yujue Yang
Flexible and stretchable electrodes have been extensively explored in recent decades, promoting remarkable advances in wearable electronics. However, for the foreseeable future it will be hard to achieve a level of conductivity of stretchable electrodes equivalent to that of metallic electrodes, which undermines the potential for practical applications, especially for fiber-shaped electrodes with long length/diameter. Herein, the basic physical concept of the small resistance of parallel circuits was applied to a triboelectric nanogenerator (TENG) fiber/textile to dilute the negative effects of the huge resistance of stretchable electrode fibers. As a demonstration of the concept, stretchable gel electrode-based fibers were woven into parallel multi-fiber TENG structures (parallel-teng), which significantly reduced electrode resistance compared to single long-fiber knitting TENG (GS-teng). The output current of parallel-teng showed an 11.8 fold enhancement compared to that of GS-teng owing to the decrease in the inner resistance by an order of magnitude. This work demonstrates an easy method to reduce the electrode resistance using parallel multi-fiber structures, which provide an approach for dealing with low conductivity electrodes in practical application. Furthermore, other wearable devices where there is the challenge of stretchable high resistance of electrode fibers, such as fiber batteries and piezoelectric fibers, could be inspired by this work because of the versatility of the physical concept.
研究领域:
材料科学
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能源技术
·
柔性电子
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2017
·
IF 4.798
Fengxia Zhang,Ping Zhang,Qiong Wu,Wenjing Xiong,Qi Kang,Dazhong Shen
Herein, we proposed a simple method to measure the inner resistance of a photoelectrochemical (PEC) sensor. Three photoanodes, including TiO 2 nanotubes array (TiO 2 NTs), g-C 3 N 4 /TiO 2 NTs and Mn 3 (BTC) 2 /g-C 3 N 4 /TiO 2 NTs (BTC = 1,3,5-benzene- tricarboxylic acid), were chosen as the models. It was shown the change in inner resistance of the photoanode is the main factor for the photocurrent response in a PEC sensor. Under light excitation, the inner resistance of the photoanode is reduced remarkably, resulting in the increment in the photocurrent. The influence of the light intensity on the inner resistance is less than that on the photocurrent, due to the synchronous change in photovoltage . With increasing concentration of hole scavengers (e.g., H 2 O 2 , ascorbic acid), the steady inner resistances of the three photoanodes are decreased. In the PEC sensor with Mn 3 (BTC) 2 /g-C 3 N 4 /TiO 2 NTs, the Mn 3 (BTC) 2 layer is served as a size-exclusion filter to prevent the diffusion of molecules with size larger than the apertures in crystals, which improves the selectivity of the PEC sensor to smaller molecules (e.g., H 2 O 2 ). The catalytic effect of Mn 3 (BTC) 2 to H 2 O 2 enhances the PEC response sensitivity to H 2 O 2 . Under optimized conditions, the reciprocal of the averaged steady effective inner resistance of Mn 3 (BTC) 2 /g-C 3 N 4 /TiO 2 NTs is in a linear correlation with the logarithmic concentration of H 2 O 2 in the range of 0.003 to 10 μM with a limit of detection of 1 nM. This PEC sensor was applied for H 2 O 2 determination in exhaled breath condensate samples.
研究领域:
分析化学
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材料科学
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生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED ENERGY
·
2024
·
IF 10.1
Ruhui Xu,Xinhai Li,Siqi Tang,Zhixing Wang,Huajun Guo,Wenjie Peng,Ding Wang,Jianguo Duan,Jiexi Wang,Guochun Yan
Accurate failure analysis plays a pivotal role in the optimization design and lifetime prediction of 4.45 V high-voltage LiCoO 2 /Graphite (LCO/Gr) batteries . Multiphysics coupling model brings great opportunities to conduct battery failure analysis quantitatively, although it is quite challenging because many model parameters need to be handled properly. Herein, we systematically elaborate the differences of ion and electron transport properties before and after cycling ageing of LCO/Gr batteries by constructing direct current internal resistance (DCR) decomposition model. The key parameters acquisition method is established, and the mechanism of DCR growth is elucidated. Furthermore, the aforementioned model parameters are refined by using a hybrid power pulse characteristics (HPPC) curve optimization algorithm based on DCR decomposition results obtained from the three-electrode battery system. Through analyzing the influence of single-factor parameter ageing on battery voltage output capacity and discharge temperature rise, the main factors affecting battery failure process are identified. For instance, the account of the positive electrochemical reaction resistance related to the k pos increased from the initial 22.9% of total DCR to 37.3% after ageing. This work provides a reliable quantitative analysis basis for the global optimization design of advanced LIBs .
研究领域:
电化学
·
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL RESEARCH
·
2022
·
IF 8.431
Heming Wang,Jidong Liu,Cheng Gui,Qi Yan,Luchuan Wang,Shenghan Wang,Juanjuan Li
The soil remediation by microbial fuel cells (MFCs) is still challenging due to the high mass transfer resistance limiting the overall performance. To improve the remediation of Cr(VI) contaminated soil, iron-loaded activated carbon (AC-Fe) particles were synthesized and spiked into soil to establish an enhanced MFC system . The AC-Fe particles are porous and conductive with a high specific surface area of 1166.5 m 2 /g. The addition of AC-Fe particles could reduce the overall resistance from 4269.2 Ω to 303.1 Ω with the optimum dosage of 0.3%. The maximum power generation of MFC was 11.5 mW/m 2 , and Cr(VI) removal efficiency reached as high as 84.2 ± 1.2% in 24 h. It was found that AC-Fe particles were able to simultaneously adsorb and reduce Cr(VI) to Cr(III); in the meantime, Fe(II) loaded on the AC-Fe was oxidized to Fe(III). Spiking more AC-Fe particles in the contaminated soil had a negative effect. It was probably because that AC-Fe particles working as the third electrodes would hinder the overall ion electromigration and decrease Cr(VI) reduction at the cathode. The enhanced system which coupled MFC and AC-Fe showed a synergistic removal of Cr(VI), with the maximum improvement of 22.1% compared to the sum of Cr(VI) removals by the individual ones.
研究领域:
环境微生物学
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土壤修复工程
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环境功能材料
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电化学工程
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污染生态学
·
环境化学
✓ 已验证
DOI
高影响因子
Advanced Composites and Hybrid Materials
·
2024
·Vol. 7
·期 2
·1-12
·
IF 23.2
Li Bin,Li Jian,Guo Minghui
Using biomass waste materials to prepare electrode materials with excellent properties is an effective strategy for solving current energy and environmental problems. In this work, coffee grounds were pretreated with Co(NO 3 ) 2 and Ni(NO 3 ) 2 , then KOH was used to activate the pretreated coffee grounds at a high temperature to obtain a foam-like electrode material with interconnected microporous-mesoporous-macroporous hierarchical channels. This preparation method is simple and has low energy consumption, and the resulting material has an ultra-low internal resistance of 0.31 Ω. The specific capacitance of CGC-2 is 302.65 F g −1 at a current density of 1 A g −1 . The low internal resistance and high electrical conductivity of this activated material are attributed to the presence of Co 2+ and Ni 2+ during carbonization, whose catalytic effect leads to a relatively ordered lattice structure. The interconnected structure of the final product is mainly caused by the strong activation function of KOH generating many pores. The prepared material exhibits good rate performance and cycling stability, and it has a Coulombic efficiency of nearly 93%. This work provides a novel idea for using biomass materials to fabricate high-performance electrode materials for supercapacitors. Graphical abstract
研究领域:
储能
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材料科学
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环境科学
·
电化学
·
纳米技术
✓ 已验证
DOI
高影响因子
Energy & Environmental Science
·
2023
·Vol. 16
·期 6
·2494-2504
·
IF 32.5
Nan He,Haonan Wang,Fan Li,Bo Jiang,Dawei Tang,Lin Li
Hydrovoltaic electricity generators (HEGs), powered by ubiquitous water evaporation, are emerging due to their high spontaneity and continuity. However, the current performance of most HEGs is restricted to 50.00 μA cm−2, far from commercial applications. Herein, we propose an ion-engine HEG by establishing a concentration gradient of an ionisation group in hydrogels along the direction of ion migration. The distinctively designed ion gradient acts as an engine to accelerate ion migration by enhancing diffusion, hence increasing the generated current. Notably, the ion-engine HEG generates a record-breaking current density of 466.75 μA cm−2, 10 to 100 times higher than those of previously reported HEGs. The ion-engine HEG possesses the lowest internal resistance, which is the closest to that of commercial products. In addition, the high transparency, flexibility, and customisability of hydrogels offer HEGs a wide range of applications, such as night-time lighting, sweat monitoring, and powering small unmanned boats. These findings provide a fresh perspective on high-performance HEGs, which have great potential to serve energy technology and intelligent life.
研究领域:
能源技术
·
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2021
·Vol. 38
·期 4
·1065-1072
·
IF 1.307
Yang Zhichen,Kang Xiaoting,Zou Bo,Yuan Xuna,Li Yajie,Wu Qin,Guo Yupeng
The massive discharge of biomass wastes not only causes waste of resources, but also pollutes the environment. Therefore, converting biomass wastes into carbon materials is an effective way to solve the above problems. Here, using biomass waste pig nails as raw materials and K 2 CO 3 as chemical activators, the N-doped porous carbon(KPNC) is prepared by direct pyrolysis. As an electrode for supercapacitors, the electrochemical tests of KPNCs showed that they exhibited good electrochemical performance and excellent cycling stability. When the current density is 0.2 A/g, the specific capacitance is up to 344.6 F/g. Moreover, it still maintains 97.6% initial capacitance retention after 2000 cycles at a high current density of 5 A/g. Above exceptional electrochemical performances may be ascribed to an appropriate porous structure( S micro / S total =80.31%, V micro / V total =76.19%), high nitrogen contents(4.44%, atomic fraction), oxygen contents(9.13%, atomic fraction) as well as small internal resistance. The above experimental results show that the conversion of pig nails to porous carbon can reduce the waste of resources and alleviate environmental pollution.
研究领域:
材料科学
·
环境科学
·
能源存储
✓ 已验证
DOI
高影响因子
Science Bulletin
·
2018
·
IF 4.136
Funian Mo,Hongfei Li,Zengxia Pei,Guojin Liang,Longtao Ma,Qi Yang,Donghong Wang,Yan Huang,Chunyi Zhi
Thermal runaway has been a long-standing safety issue impeding the development of high-energy-density batteries. Physical safety designs such as employing circuit-breakers and fuses to batteries are limited by small operating voltage windows and no resumption of original working condition when it is cooled down. Here we report a smart thermoresponsive polymer electrolyte that can be incorporated inside batteries to prevent thermal runaway via a fast and reversible sol-gel transition, and successfully combine this smart electrolyte with a rechargeable Zn/ α -MnO 2 battery system. At high temperature, battery operation is inhibited as a result of the increased internal resistance caused by the gelation of liquid electrolyte. After cooling down, the electrolyte is spontaneously reversed to sol state and the electrochemical performance of the battery is restored. More importantly, sol-gel transition enables the smart battery to experience different charge-discharge rates under various temperature levels, providing a smart and active strategy to achieve dynamic and reversible self-protection.
研究领域:
储能技术
·
材料科学
·
电化学
·
智能材料
·
电池安全
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2022
·
IF 9.794
Yue Qin,Huiyu Li,Yaxin Sun,Shiquan Guo,Chunhong Shi,Yuanfeng Liu,Congju Li
Sluggish kinetics of the cathodic oxygen reduction reaction (ORR) is one of the major challenges hindering the development of microbial fuel cells (MFCs). In this work, a three-dimensional (3D) cellular scaffolds structure is fabricated by in-situ growth of conductive Ni/Co-catecholate bimetal metal-organic frameworks (MOFs) on multiwalled carbon nanotubes (NiCo-CAT/MWCNTs). Such specific structure successfully achieves favorable electronic channels and fast charge-transfer capacity and displays an ultra-low ohmic internal resistance of 7.27 Ω. Meanwhile, NiCo-CAT/MWCNTs exhibit a superior ORR half-wave potential (−0.442V vs. Hg/HgCl 2 ), onset potential (−0.064V vs. Hg/HgCl 2 ) and high limiting current density (8.25 mA cm −2 ), which exceed that of commercial Pt/C. In the MFC with the NiCo-CAT/MWCNTs cathode, the maximum power density is 130% higher than Pt/C cathode. The outstanding performance of MFC is mainly due to the optimized electronic structure and fully exposure of the Ni, Co synergistic catalytic active sites. In addition, oxygen permeability is greatly improved by electrospun polyvinylidene fluoride (PVDF) air diffusion layer replacing the traditional carbon cloth cathode. This study provides a new perspective for MFCs performance improvement by ORR conductive MOFs catalysts.
研究领域:
材料科学
·
电化学
·
能源技术
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2019
·Vol. 54
·期 7
·5584-5594
·
IF 3.442
Lv Tingjian,Guan Li,Xiao Peng,Zhang Dongyun,Chang Chengkang
In this work, we report the preparation and the enhanced electrochemical performance of P2-type Na 0.67 Li x (Mn 0.5 Fe 0.25 Co 0.25 ) 1− x O 2 layered cathode materials with different Li substitutions via a nanomilling-assisted solid-state method. The experimental results show that the introduced lithium ions can greatly improve the performance of the material after entering the transition metal layer. Among these synthesized samples, the Na 0.67 Li 0.03 (Mn 0.5 Fe 0.25 Co 0.25 ) 0.97 O 2 electrode exhibits an exceptionally high specific capacity of 190.6 mAh g −1 at 0.1 C rate and a capacity retention of 89.5% after 30 cycles. Obviously, the specific capacity retention is improved by 15.3% compared with the pristine Na 0.67 (Mn 0.5 Fe 0.25 Co 0.25 )O 2 without Li incorporation (the specific capacity retention is only 74.2% after 30 cycles). Simultaneously, the sample also shows a large increase in rate performance compared to the pristine material. All of the enhancement can be explained by the fact that the introduced Li ions suppress the phase transition during the charge–discharge process and avoid the volume expansion of the electrode, which significantly reduce the occurrence of micro-cracks within the electrode. The reduced polarization, the decreased internal resistance of the prepared electrodes and the increased sodium ion diffusion coefficient, as confirmed from the CV and EIS measurements, can be regarded as the three major reasons for the enhanced electrochemical performance of the Li ion-substituted materials.
研究领域:
材料科学
·
电化学
·
储能技术
·
固态化学
·
纳米技术
✓ 已验证
DOI
高影响因子
CELLULOSE
·
2023
·
IF 5.7
Yang Junjie,Wang Siyong,Yao Jintong,Jiang Zhen,Fang Mingjian,Yu Tao,Wei Kang
This study focuses on investigating a novel category of paper actuators, aiming to attain a favorable equilibrium between substantial electrically actuated force and extended service lifetime ( T s ) for the soft electric-responsive artificial muscle. Consequently, the present research has developed an Electro-responsive Biomass Paper Actuator (ERBPA) utilizing calcium alginate hydrogel, employing absolute ethanol (CH 3 CH 2 OH) as the slow-release agent, through a straightforward and viable preparation procedure. Moreover, a comprehensive investigation was carried out on the electro-mechano-chemical behaviors and strengthening mechanism of the ERBPA with varying volume fractions of CH 3 CH 2 OH, under the electrical actuation of 4 V DC voltage. The experimental findings revealed a gradual decrease in the density of electrically actuated force, elastic modulus, and yield strength with the increasing volume fraction of CH 3 CH 2 OH. Specifically, at a volume fraction of 30%, these properties reached their respective minimum values of approximately 15.152 mN/g, 6.5 MPa, and 0.0999 MPa. In contrast to the internal resistance ( R g ) of the ERBPA, the specific capacitance ( C p ) and the T s exhibited an initial improvement followed by a reduction, while the rise time ( T r ) demonstrated a positive correlation with the volume fraction of CH 3 CH 2 OH but a negative correlation with the reaction velocity ( V f ). Specifically, at a volume fraction of 25%, C p , T s and T r reached their maximum values of 96.2 mF/g, 1287 s, and 170 s, respectively, whereas R g and V f attained their minimum values of 2.39 Ω and 0.044 mN/g·s, respectively. The slow-release effect of CH 3 CH 2 OH inherently contributed to the protection of certain free Ca 2+ ions, thereby causing a gradual and consistent coordination process with sodium alginate molecules. This, in turn, greatly enhanced the internal structure of ERBPA, resulting in exceptional T s stability and operational performance.
研究领域:
材料科学
·
电化学
·
机械工程
·
生物技术
✓ 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）