Energy & Environmental Science
·
2024
·Vol. 17
·期 13
·4794-4802
·
IF 32.4
Zhengqiang Hu,Fengling Zhang,Feng Wu,Huirong Wang,Anbin Zhou,Yi Chen,Tianyang Xue,Renjie Chen,Li Li
In electrochemical devices, the electric double layer (EDL) theory posits that the potential difference of the Helmholtz layer significantly influences the activation energy and reaction rate of the electrochemical reaction, which determines the uniformity of metal ion deposition. In this work, we compare the differential capacitance of metal cationic sulfate, along with factors such as cost as well as safety, and Ce(SO4)2 is selected to adjust the EDL at the Zn anode/electrolyte interface. Molecular dynamics simulations show the formation of a more compressed diffuse layer with the help of Ce4+, resulting in a decreased potential difference of the Helmholtz layer, an improved Zn2+ deposition overpotential and a reduced Zn electrode corrosion rate. In situ XRD and Raman spectroscopy reveal that Zn2+ deposition is favored along the (002) crystal plane, and hydrogen evolution is hindered. The Ce4+ modified electrolyte enables a Zn anode with high coulombic efficiency (99.6%) over 600 cycles at 10 mA cm−2. The compressed EDL extends the lifespan of the Zn–Zn cell to 2500 hours at 5 mA cm−2 and stable cycling for 300 cycles at 20 mA cm−2 and 10 mA h cm−2. Assembling Zn full cells with high-loading cathodes shows enhanced long-term cycling performance. Our findings reveal the potential of using high-valence metal cations like Ce4+ to regulate the EDL and uniform Zn2+ deposition in ZIBs, which suggests a promising direction for developing electrolytes for practical ZIBs.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Device
·
2024
·
IF 0
Huping Yan,Ronghui Qi,Zhen Liu,Han Wang,Chuanshuai Dong,Li-zhi Zhang
Ambient moisture-enabled generators (MEGs) present significant potential but suffer from low efficiency. This study explored the synergistic enhancement of an electrical double layer (EDL) at the hydrogel-electrode interface in hydrogel-based MEGs, which improves directional ion movement to achieve excellent performance. Our MEGs feature asymmetric electrodes made of carbon nanotubes and a poly(acrylamide-co-acrylic acid) hydrogel as the conductive medium. The interaction between the COOH-rich hygroscopic hydrogel and the salt-doped upper electrode established a humidity gradient within the hydrogel and a strong interfacial EDL. Results indicate that the generator (1 × 1 cm 2 ) achieved an open-circuit voltage of 1.3 V, an instantaneous short-circuit current of 55.7 μA/cm 2 , and a usable power output of 2.34 μW/cm 2 . It also exhibited robust environmental adaptability, maintaining 0.8 V below 30% relative humidity (RH) and over 0.65 V between −10°C and 60°C. Unlocking the potential of EDLs significantly enhances MEG performance, broadening application prospects in distributed self-powered devices and large-scale moisture-to-energy generation.
研究领域:
材料科学
·
能源技术
·
环境工程
✓ 已验证
DOI
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Xiang Feng,Mingyan Li,Junyi Yin,Tianyi Cui,Fuxiang Li,Yonghong Cheng,Shujiang Ding,Xin Xu,Jianhua Wang
Amino acids are considered effective additives for regulating the electric double layer (EDL) in zinc-ion battery (ZIB) electrolytes. In comparison to their polar counterparts, nonpolar amino acids have received less attention in research. We demonstrated that isoleucine (ILE), benefiting from its nonpolar alkyl chain, emerges as a highly suitable electrolyte additive for aqueous ZIBs. ILE molecules preferentially adsorb onto the anode surface of zinc metal, subsequently creating a locally hydrophobic EDL facilitated by the alkyl chain. On one hand, this enhances the thermodynamic stability at the anode, while on the other hand, it accelerates the desolvation process of zinc ions, thereby improving the kinetics. Benefiting from the unique properties of ILE molecules, Cu//Zn cells with the ILE additive ultimately achieved an extended cycle life of 2600 cycles with an average coulombic efficiency of 99.695%, significantly outperforming other amino acid additives reported in the literature.
研究领域:
材料科学
·
电化学
·
生物化学
✓ 已验证
DOI
高影响因子
ACS Nano
·
2021
·
IF 15.881
Luyao Jia,Zi Hao Guo,Longwei Li,Chongxiang Pan,Panpan Zhang,Fan Xu,Xiong Pu,Zhong Lin Wang
The electric double layer (EDL) at liquid–solid interfaces is fundamental to many research areas ranging from electrochemistry and microfluidics to colloidal chemistry. Here, we demonstrate the electricity generation by mechanically modulating the EDL at the hydrogel–dielectric polymer interfaces. It is found that contact electrification between the hydrogel and the dielectric polymer could charge the dielectric polymer surface at first; the mechanical deformation of the pyramid-shaped hydrogel results in the periodic variation of the EDL area and capacitance, which then induces an alternative current in the external circuits. This mechano-to-electrical energy conversion mechanism is then utilized to construct soft stretchable self-powered pressure sensors by designing dynamic EDL at hydrogel–dielectric elastomer interfaces. The sensitivity is optimized to 1.40 kPa–1 in the low-pressure range of 31–300 Pa by increasing the elastomer roughness. Its antifreeze performance is also improved by adding ethylene glycol into the hydrogel. The capability in detecting subtle human activities is further demonstrated. This mechano-electrical energy conversion and the corresponding self-powered sensor can be widely applied in future soft electronics.
研究领域:
材料科学
·
生物医学工程
·
软体电子学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Quan Yue,Songhua Xiao,Zhibin Li,Jing Yang,Bin Chen,Jiansong Feng,Xu Zhang,Qianling Chen,Taihong Wang
Electrohydrodynamic (EHD) preparation of micro-nano fibers has significant advantages in the application of ultra-sensitive detection. However, far-field EHD always has the problem of jet instability, which limits its further application. In this study, we excellently realize the generated single jet deposition of aligned fibers by constructing auxiliary electric fields and creatively designed an ultra-sensitive structure based on large alveolar deep tooth electrodes with oriented TPU fiber membrane. As the isolation layer, the oriented fiber membrane controls the formation of the electric double layers by adjusting the contact area between the tooth-shaped electrodes and the polyelectrolyte membrane. Meanwhile, with increasing the pressure, the tooth-shaped electrodes with large alveolar depth bring more sidewall surfaces contact and expand the capacitance adjustment range. Therefore, we can continuously adjust the capacitance of the pressure sensor through the oriented fiber membrane to achieve an ultra-broad linear range (1.1–100 kPa) with ultra-high sensitivity of 230 kPa −1 .
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
Frontiers in Physics
·
2024
·
IF 1.9
Lu Liqun,Wang Fengjuan,Wang Yuncheng,Zhang Jiawen,Xiang Li,Liu Zhiyong,Jiang Jinyang
Hydrophobic interactions are widely applied in diverse fields, yet the effect of the degree of hydrophobicity on the interactions between hydrophobic surfaces is still unaddressed, limiting the development of functional hydrophobic surfaces. In this study, the interfacial interactions and configuration of hydrophobic chains on surfaces with ranging hydrophobicity are surveyed by surface forces apparatus. Our findings revealed that with partial hydrophobicity, a long-range electrical double-layer repulsive force pertains between surfaces, while between fully hydrophobized surfaces, only steric hindrance is observed, and the hydrophobic chains maintain configuration even after long time compression. Our findings provide useful implications for understanding hydrophobic interactions.
研究领域:
材料科学
·
界面化学
✓ 已验证
产品关联
DOI
高影响因子
CARBON
·
2020
·
IF 8.821
Kunlin Liu,Ting Yang,Xuewen Zheng,Chengyang Wang,Mingming Chen
Low energy density is a fatal disadvantage of electric double-layer capacitor (EDLC). The improvement of the operation voltage of EDLCs is a more effective method to increase the energy density of EDLCs. When the operation voltage of EDLCs is higher than 2.7 V, the oxygen-containing functional groups on the surface of electrode materials (porous carbon) will decompose or chemically react with the electrolyte, causing significant deterioration of EDLC performance. In this paper, porous carbon with low oxygen content is prepared by using the potassium-assisted carbonization of chlorobenzene in Ar/H 2 mixed gas to improve withstanding voltage characteristic of porous carbon. By constructing a relatively closed and stable pyrolysis environment (employing the nickel crucible with a lid), using the carbonaceous precursor without oxygen atoms (chlorobenzene) and selecting reasonable carbonization operation atmosphere (Ar/H 2 ), the oxygen content of the as-prepared porous carbon (PC-KC-1000) is only 4.02 wt%. When the PC-KC-1000 sample is used as the electrode material of EDLCs, the operation voltage of EDLCs in the TEABF 4 /PC and EMIMBF 4 electrolytes is respectively 3.3 and 3.5 V, and the maximum energy density is respectively 53.5 and 64.4 Wh kg −1 . This strategy provides a new idea for the preparation of porous carbon with low oxygen content.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
Chem
·
2024
·
IF 19.1
Long Chen,Haikuo Zhang,Ruhong Li,Shuoqing Zhang,Tao Zhou,Baochen Ma,Chunnan Zhu,Xuezhang Xiao,Tao Deng,Lixin Chen,Xiulin Fan
The electric double layer (EDL) plays a pivotal role in the interfacial reactions that occur within lithium batteries. However, theoretical models beyond the empirical Guy-Chapman-Stern (GCS) model to understand reaction mechanisms and tuning principles are lacking. Herein, we introduce a quantitative parameter of region d within the EDL, which successfully elucidates the correlation between the EDL functional domain and the oxidation resistance of electrolytes. The reduced spatial scale of d results in a rapid decay of interface potential to the bulk level, effectively suppressing the continuous decomposition of the electrolyte. By precisely modulating the functional area represented by d, the designed 1.5 M LiFSI in a (3,3,3-Trifluoropropyl) trimethoxysilane (TFTMS) electrolyte exhibits remarkably high oxidation stability of >5.5 V and enables simultaneous stabilization of Li metal, graphite, and high-voltage layered cathodes. The EDL model incorporated with quantitative functional area d offers a promising path to guide the advancement of high-energy Li batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
ANALYTICAL CHEMISTRY
·
2022
·
IF 8.008
Peng He,Yi Shao,Zhengyou Yu,Xu Liang,Junjie Liu,Yixuan Bian,Zhiwei Zhu,Meixian Li,Carlos M. Pereira,Yuanhua Shao
Charge (ion and electron)-transfer reactions at a liquid/liquid interface are critical processes in many important biological and chemical systems. An ion-transfer (IT) process is usually very fast, making it difficult to accurately measure its kinetic parameters. Nano-liquid/liquid interfaces supported at nanopipettes are advantageous approaches to study the kinetics of such ultrafast IT processes due to their high mass transport rate. However, correct measurements of IT kinetic parameters at nanointerfaces supported at nanopipettes are inhibited by a lack of knowledge of the nanometer-sized interface geometry, influence of the electric double layer, wall charge polarity, etc. Herein, we propose a new electrochemical characterization equation for nanopipettes and make a suggestion on the shape of a nano-water/1,2-dichloroethane (nano-W/DCE) interface based on the characterization and calculation results. A theoretical model based on the Poisson–Nernst–Planck equation was applied to systematically study how the electric double layer influences the IT process of cations (TMA+, TEA+, TPrA+, ACh+) and anions (ClO4–, SCN–, PF6–, BF4–) at the nano-W/DCE interface. The relationships between the wall charge conditions and distribution of concentration and potential inside the nanopipette revealed that the measured standard rate constant (k0) was enhanced when the polarity of the ionic species was opposite to the pipette wall charge and reduced when the same. This work lays the right foundation to obtain the kinetics at the nano-liquid/liquid interfaces.
研究领域:
电化学
·
生物化学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2020
·Vol. 8
·期 17
·5913-5922
·
IF 7.059
Xiaoping Shen,Kangchen Nie,Li Zheng,Zhaosong Wang,Zhe Wang,Song Li,Chunde Jin,Qingfeng Sun
Taking inspiration from skeletal muscle with highly oriented myofibers, we developed a tough wood aerogel/poly(ionic liquid) (WA/PIL) hydrogel directly from wood via delignification, impregnation and gelation for the formation of a tactile sensor of electric double-layer capacitive configuration. The WA/PIL hydrogels integrated the representative properties of both wood and ionic liquids, being a promising candidate for both polyelectrolyte and separator materials. The influences of the wood texture and cross-linker (Bis) content on the mechanical and sensing performances of the hydrogels were investigated. The results showed that the tangential hydrogel slice with a 1.0 mol% Bis content (tan 1.0) displayed the most significant improvement in compressive stress (1.65 MPa) and deformation (73.3%) at fracture, suggesting the best compressibility. Electrodes also played a significant role in the sensitivity and stability of the sensor devices. While tan 1.0 with reduced graphene oxide (rGO) electrodes displayed the largest sensitivities (1.13–19.70 MPa−1), tan 1.0 with Ni foams possessed much more stable ionic signals within the whole stress range with sensitivities of 0.33–9.67 MPa−1. Due to the wide-stress-range responsiveness of our hydrogel sensor from gentle finger contact to vigorous hitting modes, it will find promising applications in various human–machine interfaces in the fields of electronics, recreation, sports, etc.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
IONICS
·
2018
·Vol. 24
·期 10
·3287-3290
·
IF 2.347
Zhang Bin,Zheng Yangong,Chen Weiwei,Jian Jiawen
Ionic liquid-gated organic transistors have been reported to have high mobility and low operational voltage; they mainly benefit from the capacitance of electric double layers (EDLs) at the interface of an electrolyte and a semiconductor. Although the capacitance of EDLs is usually considered a fixed value, contrary to the theory of EDLs, EDL capacitance is tunable by the electrode potential. In this study, we prepared organic transistors with ionic liquid mixed with polymer as the dielectric. We found that the conductance parameter of the semiconductor channel decreased with decreasing gate voltage. Then, to examine the changes in interfacial capacitance under various gate voltages, the impedance of the whole transistor was measured, and an equivalent circuit model was applied to extract the differential capacitance. The decreased EDL capacitance with the gate potential is ascribed to the finite ion volume in the ionic liquid gel based on Kornyshev’s theory.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 16
·1-11
·
IF 2.8
Yan Xunchang,Wang Sai,Nie Guangzhi,Gao Yuyu,Li Lin,Zhang Tong,Long Yun-Ze,Han Wenpeng
With the development of flexible wearable pressure sensors, capacitive pressure sensors using electric double-layer (EDL) effect have attracted much attention due to their advantages such as high sensitivity. In this study, an all-nanofiber ionic liquid EDL capacitive pressure sensor based on biodegradable polymer Polycaprolactone (PCL) is prepared by electrospinning technology. Based on the control of ionic liquid content in nanofibrous membranes, the performance of EDL capacitive pressure sensors has been investigated. The optimized device has a sensitivity of up to 26.4 kPa −1 in the range of below 10 kPa and 6.2 kPa −1 in the pressure range of 10 to 200 kPa. A detection limit as low as 8.53 Pa also gives it an advantage in detecting small pressures. Based on it, the prepared EDL capacitive pressure sensors have been successfully used to detect various physiological signals such as pulse, heartbeat, breathing, etc. In addition, the excellent mechanical properties and gas permeability also lay the foundation for its application in wearable electronics.
研究领域:
生物医学工程
·
材料科学
✓ 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）