ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Aizhen Xu,Wen Li,Yan Yu,Yu Zhang,Zhihua Liu,Yujun Qin
For the traditional supercapacitors based on the graphene@polyaniline (PANI) film prepared by electropolymerization, the interfacial contact between the graphene substrate and PANI shell plays a vital role in improving the PANI stability and the electrochemical capacitance of the active layer. In this work, we propose a novel strategy that the reduced graphene oxide (RGO) hydrogel film with given size could be divided into two for respective PANI electrodeposition and the two graphene@PANI films are assembled parallelly on carbon cloth to obtain the supercapacitor electrode. Owing to the additional lateral RGO/PANI interface, the resulting electrode delivers a high specific capacitance of 949 F g −1 at 1 A g −1 and 760 F g −1 even at the high current density of 20 A g −1 . The corresponding binder-free symmetric supercapacitor device could attain a maximum energy density of 18.2 Wh kg −1 and a maximum power density of 4.75 kW kg −1 , with a high capacitance retention of 93.1% after 10000 charge/discharge cycles. These superior properties of the electrodes based on the parallel RGO/PANI films testify the rational design of the active layer configuration for enhanced interfacial effect. This work would provide a novel pathway towards the preparation of high-performance supercapacitor electrodes.
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
·
2025
·
IF 13.2
Xueqing Gao,Ziwei Wang,Juan Du,Aibing Chen
It is desirable that catalysts preparation and subsequent application can be driven by only one set of equipment, enabling efficient system integration, hydrogen generation and value-added chemicals acquisition. Here we demonstrate a strategy of tandem paired electrodes, which contain a deeply foaming electrode with vacancy as cathode (DF/cNF) for electroreductive water splitting, and a wrinkled NiMoO 4 -Ni(OH) 2 heterojunction electrode serving for anode (NiMo-Ni/aNF) to electrooxidize biomass conversion. For integrally paired electrodes, DF/cNF shows excellent HER performance with 43 mV overpotential at 10 mA cm −2 , and NiMo-Ni/aNF exhibits good biomass oxidation activity, such as almost 100 % 5-hydroxymethylfurfural conversion and 96.4 % 2,5-furandicarboxylic acid selectivity. Remarkably, in situ Raman spectra and operando scanning electrochemical microscopy (SECM) analysis indicate NiMoO 4 -Ni(OH) 2 heterojunctions stabilize the vital Ni III intermediate role in oxidation reaction. Density functional theory (DFT) results further prove the advantage of Ni vacancy for enhanced HER activity and interface for improving biomass oxidation performance. This work delivers a novel system of tandem paired electrodes and highlights precise control for catalysts by geometric and electronic structural engineering.
研究领域:
能源科学
·
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Yan Zhong,Jiaqi Wang,Longgang Wu,Kunshan Liu,Shengping Dai,Jing Hua,Guanggui Cheng,Jianning Ding
A microstructured surface has been applied in self-powered triboelectric pressure sensors to increase the charge-carrying sites and enhance the output performance. However, the microstructure increases the distance between the electrode and the triboelectric layer, and its influence on the output performance is unknown. Herein, we proposed a dome-conformal electrode strategy for a self-powered triboelectric nanogenerator (TENG) pressure sensor. With a simple reverse-dome adsorption process, an ultrathin triboelectric layer and Ag electrode can be made conformal to the dome PDMS structure. The TENG sensor is constructed with paper as a positive triboelectric layer. Compared with the device based on nonconformal structure, the conformal design strategy endows the device with a faster charge transfer and enhanced output voltage. By doping with BaTiO3, the outermost triboelectric layer can be easily modified to improve its ability of sustaining charge, and an ultrathin PDMS layer is coated on the triboelectric layer to expand the triboelectric polarity difference between two triboelectric layers so as to enhance the output voltage. The synergistic effects enable the optimized TENG sensor with a sensitivity of 0.75 V/kPa in the low-pressure region (0–26 kPa) and 0.19 V/kPa in the high-pressure range (26–120 kPa). Its application in human motion detection, grabbing water beakers, and noncontact distance testing has been demonstrated. This work provides a route such as a conformal structure design strategy to enhance the output performance of a microstructure-based TENG sensor.
研究领域:
材料科学
·
传感器技术
✓ 已验证
DOI
PubMed
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 72
·41657-41662
·
IF 2.936
Rui Feng,Yang Liu,Shipu Li,Hanbin Chen,Chengyi Song,Peng Tao,Jianbo Wu,Peng Zhang,Tao Deng,Wen Shang
This paper presents the study on the hydrogen evolution reaction (HER) of the silicon nanowire (SiNW)-based surfaces. Large-area SiNWs with different lengths were fabricated on the silicon surfaces by a cost effective and scalable wet-etching method. The SiNW-based surfaces promoted the photoelectrocatalytical performance of the electrodes due to the increased effective surface area for electrolyte diffusion and the fast release of hydrogen bubbles that formed on the electrodes. In addition, at different applied potentials, the nanostructured electrodes showed different behaviour that depended on the SiNWs' with different lengths and morphologies. For example, surfaces with longer SiNWs performed better in the low potential region, while surfaces with shorter SiNWs presented improved performance in the high potential region. The findings in this study provide new insights into designing electrodes with desired nanostructures for improved HER performance.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
Small
·
2024
·Vol. 20
·期 29
·2310978
·
IF 13
Chenyu Ma,Wenting Feng,Debin Kong,Xinru Wei,Xuelei Gong,Jianhang Yang,Junwei Han,Linjie Zhi
Rechargeable sodium chloride (Na-Cl 2 ) batteries have emerged as promising alternatives for next-generation energy storage due to their superior energy density and sodium abundance. However, their practical applications are hindered by the sluggish chlorine cathode kinetics related to the aggregation of NaCl and its difficult transformation into Cl 2 . Herein, the study, for the first time from the perspective of electrode level in Na-Cl 2 batteries, proposes a free-standing carbon cathode host with customized vertical channels to facilitate the SOCl 2 transport and regulate the NaCl deposition. Accordingly, electrode kinetics are significantly enhanced, and the deposited NaCl is distributed evenly across the whole electrode, avoiding the blockage of pores in the carbon host, and facilitating its oxidation to Cl 2. With this low-polarization cathode, the Na-Cl 2 batteries can deliver a practically high areal capacity approaching 4 mAh cm −2 and a long cycle life of over 170 cycles. This work demonstrates the significance of pore engineering in electrodes for mediating chlorine conversion kinetics in rechargeable alkali-metal-Cl 2 batteries.
研究领域:
电化学
·
能源材料
·
纳米结构材料
·
储能技术
·
电极工程
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Xiao-ying Xu,Jia-hua Liu,Xing Ouyang,Lifeng Cui,Jiaoling Hong,Xiao Meng,Siyin Qin,Chen Liu,Jiaoning Tang,Da-Zhu Chen
Benefiting from the on-going update of wearable electrical devices, flexible supercapacitors have attracted extensive attention in energy storage devices. However, the challenge still exists in achieving high electrochemical performance and cycling stability at high operating temperatures. Herein, an innovative in-situ thermal management system by rationally implanting microencapsulated phase change materials (MPCMs) into three-dimensional porous reduced graphene oxide/polyaniline (GP) frameworks on the surface of carbon nanotube film (CNF) was developed for flexible all-solid-state supercapacitors via facile one-pot electrochemical co-deposition method. The flexible sandwich-shaped all-solid-state supercapacitors using hybrid CNF/GP/MPCMs as electrodes and PVA-H 2 SO 4 as the gel electrolyte were successfully assembled. The incorporation of MPCMs effectively suppressed the temperature fluctuation of the supercapacitor and promoted its operation stability at high temperatures. The supercapacitor containing MPCMs showed superior long-term cyclic stability in comparison with the counterpart without MPCMs. Moreover, the as-prepared supercapacitor was capable of enduring deformations of various angles and maintained 94.1% of the initial capacitance after 500 bending cycles, manifesting excellent mechanical performance. The study paves a feasible way of facilely constructing temperature regulation mechanism based on MPCMs for flexible high-performance supercapacitors.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2022
·
IF 9.794
Qichao Wang,Zhuo Chen,Xiangxin Zhang,Changxin Lin,Yanhua Feng,Yining Zhang
To improve the energy density of the batteries , constructing electrode structure should also be considered besides developing high specific capacity electrode materials. As the active material loading increases, the electrode rate performance worsens due to the long distance of electron transport and ion diffusion. This study proposes a simple and effective strategy to construct a high-load LiFePO 4 electrode with excellent rate performance by using a double-layer structure. The bottom layer with more conductive additives forms a rich conductive network to improve the ability of electronic collection, the top layer with fewer conductive additives increases the porosity to facilitate ion diffusion. The capacity of the double-layer electrode (active material loading 11.4 mg cm −2 ) with imparity distribution of conductive additives achieves 98 mAh g −1 at 425 mA g −1 (2.5C). However, the capacity of the single-layer electrode is zero even at a lower loading (7.1 mg cm −2 ). The vertical imparity distribution of conductive additives in the double-layer structure can reduce the polarization and maintain the excellent rate performance of the high-load electrode. This strategy can be used not only in lithium-ion batteries but also for other energy storage systems possibly.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米结构工程
·
功能材料
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2024
·
IF 8.1
Danmin Cai,Meiting Gao,Sifei Luo,Xueyin Wu,Yuhan Yang,Yong Xie,Licai Zhu,Xiaolong Deng,Yajuan Ji,Zhongzhi Yuan
We have applied a scalable multilayer coating method to design three porous cathodes (90 μm thickness, areal loading ca. 25 mg cm −2 , areal capacity ca. 5.3 mAh cm −2 ) based on LiNi 0.9 Co 0.05 Mn 0.05 O 2 active materials in the form of small single-crystal (SSC) particles, large polycrystalline (LPC) secondary particles, and small polycrystalline (SPC) secondary particles. The V-type electrode facilitates Li + transport, has a high characteristic thickness (46–57 μm), long cycle life with an active material utilization of 49.67% and a capacity retention of 88.24% after 100 cycles. The A-type electrode exhibits restricted Li + transport, lower characteristic thickness (23–30 μm), fast cyclic capacity decay with an active material utilization of 26.31% and a capacity retention of 68.76% after 100 cycles. The small particles on the upper layer of the A-type electrode exhibit high-rate characteristics, exceeding 82.5% of the discharge capacity of a single-layer electrode with a uniform mixture of LPC and SSC at a 4C discharge rate. The combination of SSC and LPC particles facilitates high specific energy and cycling stability with optimum stability when stored at 60 °C under 100% state of charge (SOC). The design strategy that is proposed offers a commercial route to boosting battery energy density from 220 Wh kg −1 to above 300 Wh kg −1 .
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米技术
·
应用物理
·
化学工程
·
先进制造
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Xiaosha Cui,Yaxiong Zhang,Situo Cheng,Yupeng Liu,Zhipeng Shao,Zhenheng Sun,Yin Wu,Hongzhou Guo,Jiecai Fu,Erqing Xie
The mild electrolyte working environment of rechargeable aqueous Zn-ion batteries (AZIBs) features its promising characteristic and potential application for large-scale energy storage system. However, the poor cycling stability significantly hinders the broad application of AZIBs due to the complex electrochemical conversion reactions during charge-discharge process. Herein, we propose a strategy to improve the electrochemical performance of AZIB by enhancing the successive electrochemical conversion reactions. With a rational design of electrode, an even homogeneous electric field can be achieved in the cathode side, resulting to significantly enhanced efficiency of successive electrochemical conversion reactions. Charge storage mechanism studies reveal that the reversibility behaviors of byproducts alkaline zinc sulfate (ZHS) can dramatically determine the H + /Zn 2+ de/intercalation process, and a high reversibility characteristic ensures the facilitated electrochemical kinetics. As expected, the resultant AZIB possesses outstanding electrochemical performance with a high specific capacity of 425.08 mAh⋅g −1 at 0.1 A⋅g −1 , an excellent rate capacity of about 60% (246.6 mAh⋅g −1 at 1 A⋅g −1 ) and superior cycling stability of 93.7% after 3000 cycles (at 3 A⋅g −1 ). This effective strategy and thinking proposed here may open a new avenue for the development of high-performing AZIBs.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
Nature Communications
·
2025
·Vol. 16
·期 1
·1-12
·
IF 15.7
Yang Yaqian,Ran Wenhao,Li Ying,Chen Yancheng,Chen Di,Shen Guozhen
Biological vision system-inspired optoelectronic synapses integrate sensing, memory, and processing for external information perception. However, most efforts focus on spatial expansion while overlooking critical dimensions like polarization and temporal evolution, which are critical for information extraction in complex environments. Inspired by the polarization-sensitive properties of kingfisher vision, we develop a polarization-sensitive optoelectronic synapse array device based on PEA 2 SnI 4 microwires array. Their anisotropic properties ensure polarization recognition, achieving a dichroic ratio of 1.38. And the asymmetric electrode designs create differentiated contact barriers, facilitating efficient charge storage and erasure under low power consumption. By employing four polarization-state-dependent convolutional kernels, the device demonstrates edge extraction capabilities even under 50% salt pepper noise. Furthermore, it enables high-precision in-sensor reservoir computing, with 100% accuracy in extracting fish trajectories under complex light environments. This work demonstrates motion perception in complex environments and provides a foundation for developing multi-dimensional, time-resolved visual systems for intelligent sensing and recognition.
研究领域:
神经形态工程
·
光电子学
·
人工智能
·
传感器技术
·
材料科学
·
计算机视觉
·
信息处理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2022
·
IF 7.336
Yifan Zhang,Laifu Yang,Wenqiang Wang,Gengchao Wang
LiNbO 3 is an intercalation material with high theoretical specific capacity, which is promising for lithium-ion capacitor (LIC) anode. However, the poor charge transfer dynamics makes LiNbO 3 unable to match the capacitive cathode in rate performance and cycle stability, resulting in poor electrochemical performance of the device. Herein, through the integrated process of in-situ nitrogen-doping with polypyrrole as the nitrogen source and hydrothermal deposition, the coaxial heterostructure of ultrafine LiNbO 3 nanoparticles and nitrogen-doped carbon nanotubes (NCNT) was realized. The large lithium-ion accessible surface and the bonding with the conductive channel significantly enhance the pseudocapacitive behavior of LiNbO 3 (capacitance contribution of 78.5% at 1 mV s −1 ). After 1000 cycles at a current density of 2 A g −1 , NCNT@LiNbO 3 still has a specific capacity of 154.9 mAh g −1 (89.8%). Thus, the assembled NCNT@LiNbO 3 //AC devices can charge and discharge up to 10000 cycles at a current density of 2 A g −1 , and the capacity retention rate can still reach 90.3%, and can provide an energy density of 142 Wh kg −1 . This work provides ideas for the interface and structure design of nanocomposite electrode materials.
研究领域:
材料科学
·
电化学
·
纳米复合材料
·
能源存储
·
界面工程
·
电极设计
✓ 已验证
DOI
高影响因子
Advanced Energy Materials
·
2019
·Vol. 9
·期 15
·1803627
·
IF 24.884
Dongjiang Chen,Ziqi Zhou,Chao Feng,Weiqiang Lv,Zhaohuan Wei,Kelvin H. L. Zhang,Bin Lin,Songhao Wu,Tianyu Lei,Xuyun Guo,Gaolong Zhu,Xian Jian,Jie Xiong,Enrico Traversa,Shi Xue Dou,Weidong He
Structural/compositional characteristics at the anode/electrolyte interface are of paramount importance for the practical performance of lithium ion batteries, including cyclic stability, rate capacity, and operational safety. The anode-electrolyte interface with traditional separator technology is featured with inevitable phase discontinuity and fails to support the stable operation of lithium ion batteries based on large-capacity anodes with structural change in charges/discharges, such as transition metal oxide anodes. In this work, an anode/electrolyte framework based on an oxide anode and an active-oxide-incorporated separator is proposed for the first time and investigated for lithium ion batteries. The architecture builds a robust anode-separator interface in LIBs, shortens Li + diffusion path, accelerates electron transport, and mitigates the volume change of the oxide anode in electrochemical reactions. Remarkably, 4 wt% CuO addition in the separator leads to a 17% enhancement in the overall capacity of a battery with a CuO anode. The battery delivers an unparalleled record reversible capacity of 637.2 mAh g −1 with a 99% capacity retention after 100 charge/discharge cycles at 0.5 C. The high performance are attributed to the robust anode-separator interface, which gives rise to enhanced interaction between the oxide anode and the same-oxide-incorporated composite in the separator.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米材料
·
功能高分子
·
界面工程
·
电极设计
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）