ELECTROCHIMICA ACTA
·
2017
·
IF 4.798
Rong Wang,Shengxia Zhang,Yun Su,Junxia Liu,Ye Ying,Feng Wang,Xiaowei Cao
A semi-solid state electrochromic device with deep eutectic solvent gel as the electrolyte, Ethyl-viologen as the electrochromic compound, and K 4 Fe(CN) 6 as the electron donor was reported. Four kinds of silica were simply mixed with ethaline for preparing the gel electrolyte, and the hydrophilic ones were found to be capable of being used as the gelling agent . To enhance the electron transfer at the electrode/gel interface and keep the transparency of the electrode, tiny amount of Au was electrochemically deposited on the FTO electrode. The as-prepared electrochromic device shows a coloration time of ca. 60 s at −0.7 V with the coloration efficiency of 91 cm 2 /C, and a bleaching time of ca. 150 s at 0 V with the efficiency of 194 cm 2 /C. The reversible response of the electrochromic device up to 820 cycles with Δ T max > 60% was also demonstrated.
研究领域:
材料科学
·
电化学
·
能源存储与转换
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2022
·
IF 6.959
Sisi Wu,Jing Yang,Ning Qin,Yingzhi Li,Haiou Wang,Yong-Wei Zhang,Qing Wang,Zhouguang Lu
LiO2 is a critical intermediate of oxygen reduction reaction in nonaqueous Li–O2 batteries that largely determines the discharge capacity and cycling stability. Currently, functional redox mediators that can promote the solution reaction route by enhancing the solvation of LiO2 have attracted tremendous interest to increase the attainable capacity. Conversely, redox mediators that quench LiO2 and facilitate the surface reaction route receive little attention. Here, we provide an in-depth exploration of the catalytic pathway and effect of a superoxide quencher that modulates the surface growth of Li2O2. Surprisingly, the predomination of the surface reaction route by ethyl viologen helps deliver a capacity as much as that promoted by the solution reaction route. The findings of this work provide a new direction of screening and evaluating functioning redox mediators for Li–O2 batteries.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
Microsystems & Nanoengineering
·
2024
·Vol. 10
·期 1
·1-9
·
IF 7.3
Guo Shanlu,Zhu Ruihe,Chen Jingwei,Liu Weilin,Zhang Yuxiang,Li Jianmin,Li Haizeng
With the increasing demand for multifunctional optoelectronic devices, flexible electrochromic energy storage devices are being widely recognized as promising platforms for diverse applications. However, simultaneously achieving high capacitance, fast color switching and large optical modulation range is very challenging. In this study, the MXene-based flexible in-plane microsupercapacitor was fabricated via a mask-assisted spray coating approach. By adding electrochromic ethyl viologen dibromide (EVB) into the electrolyte, the device showed a reversible color change during the charge/discharge process. Due to the high electronic conductivity of the MXene flakes and the fast response kinetics of EVB, the device exhibited a fast coloration/bleaching time of 2.6 s/2.5 s, a large optical contrast of 60%, and exceptional coloration efficiency. In addition, EVB acted as a redox additive to reinforce the energy storage performance; as a result, the working voltage window of the Ti 3 C 2 -based symmetric aqueous microsupercapacitor was extended to 1 V. Moreover, the device had a high areal capacitance of 12.5 mF cm −2 with superior flexibility and mechanical stability and showed almost 100% capacitance retention after 100 bending cycles. The as-prepared device has significant potential for a wide range of applications in flexible and wearable electronics, particularly in the fields of camouflage, anticounterfeiting, and displays.
研究领域:
材料科学
·
电化学
·
能源存储
·
柔性电子
·
光电子学
✓ 已验证
DOI
PubMed
高影响因子
DYES AND PIGMENTS
·
2019
·
IF 4.018
Sixuan Xiao,Yujie Zhang,Long Ma,Shan Zhao,Nan Wu,Debao Xiao
In this paper, 1,1′-bis (2-sulfonatoethyl) viologen (SEV) and 1,1′-bis (3-sulfonatopropyl) viologen (SPV) as chromophore were synthesized and used to fabricate hydrogel-based electrochromic devices . The electrochromic hydrogel, consisting of SEV (or SPV), water, sodium carboxymethylcellulose and 1,1′-ferrocenedimethanol, was employed to fabricate all-in-one electrochromic devices. The proposed SEV/SPV-based hydrogel electrochromic devices have satisfactory coloration efficiency up to 304 cm 2 /C, response times below 3 s and driving voltages below −0.8 V. Surprisingly, SEV-based hydrogel and SPV-based hydrogel electrochromic device showed high cycling stability, attenuating 2% after 10000 cycles and attenuating 1% after 8000 cycles, respectively. The easy-to-make process for device and outstanding electrochromic properties of the hydrogel containing SEV and SPV make it promising to achieve environmentally benign electrochromic devices for smart windows and so forth.
研究领域:
材料科学
·
电化学
·
光电
✓ 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）