Advanced Materials Technologies
·
2023
·Vol. 8
·期 11
·2201967
·
IF 6.8
Jiping Zhao,Youlong Xu,Wenqiang Hou,Yizhuo Li,Xiangdong Ding
Although embedded capacitors have been applied and researched for many years, their large-scale application still faces challenges such as low capacitance density, high thickness, high cost, and incompatibility with integrated processes. In this work, a breakthrough has been made in the fabrication of ultra-thin tantalum (Ta) capacitors with ultra-high capacitance density that can be used for 3D packaging. The key to these excellent performances is the application of Ta foil with nano-porous structure to the anode of the capacitor. The Ta foil with high specific surface area (SSA) is successfully prepared by direct current pulse etching. At a current density of 15 mA cm −2 , a pulse frequency of 50 Hz, and a duty cycle of 30%, the SSA of Ta foil is increased by 76 times after etching in an electrolyte with 0.01 v% TOA for 30 min. Based on this, Ta capacitors with a form factor of less than 40 µm, showing a capacitance density of 750 nF mm −2 and a leakage current of less than 2.1 × 10 −7 A at 8 V is successfully fabricated. To the best of the authors’ knowledge, this is the highest capacitance density reported to date for the mentioned form factors.
研究领域:
电子材料学
·
微电子技术
✓ 已验证
DOI
高影响因子
LANGMUIR
·
2024
·
IF 3.7
Liye Ni,Guangjie Yang,Chenweijia He,Tiancheng Lan,Shuijian He,Haoqi Yang,Nan Wu,Rulan Chen,Li Liu,Fangdi Wu,Qian Zhang
The preparation of porous carbon is constrained by the extensive use and detrimental impact of activators and dopants. Therefore, developing green and efficient strategies that leverage the intrinsic properties and pretreatment of the materials to achieve self-activation and self-doping is particularly crucial for porous carbon materials. Herein, potassium histidine was utilized as the molecular salt precursor, attaining the efficient and streamlined preparation of porous carbon through a one-step carbonization process that enables self-activation, self-doping, and self-templating. More interestingly, the carbonization temperature significantly impacts the porous structure of the molecular salt precursors, the properties of the heteroatoms, and electrochemical performance. The designed electrodes exhibit high accessibility to electrolyte ions and effective ion-electron transport channels. Therefore, the optimal carbon material (KHis800) has an excellent mass-specific capacitance of 305.2 F g–1 at 0.2 A g–1, and a high capacitance retention rate of 115.6% (50,000 cycles at 5 A g–1). Notably, KHis800 also shows a maximum energy density of 19.6 Wh kg–1. This research is dedicated to exploring a more efficient preparation method for porous carbon material via molecular salts, offering insights for the sustainable development of carbon materials.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Xingxing Li,Yanan Ma,Yang Yue,Guosheng Li,Chuankun Zhang,Minglei Cao,Yongchen Xiong,Jintao Zou,Yongheng Zhou,Yihua Gao
In recent years, the metal ion hybrid micro-supercapacitor (MSC) comprised of the battery-type Faradaic cathode based electrode and capacitor-type anode based electrode, can realize both high power and energy density, which becomes one of the most hottest areas of energy device. Herein, we demonstrated a zinc-ion hybrid micro-supercapacitor (ZIHMSC) by designing a Ti 3 C 2 T x MXene based electrode as capacitor-type anode and vanadium pentoxide (V 2 O 5 ) based electrode as battery-type cathode. In addition, the polyacrylamide (PAM) hydrogel where ZnSO 4 dissolved was chosen as the electrolyte, which effectively avoids the security risks, unlike other hybrid MSC based on the organic electrolytes. Meanwhile, the flexible ZIHMSC also exhibits well electrochemical properties, displaying a remarkable capacitance (129 mF cm −2 under 0.34 mA cm −2 ), high energy density (48.9 μWh cm −2 at 673 μW cm −2 ) and well-cycle stability (retaining ~ 77% capacitance after 10,000 cycles). This work supports a prospective routine for constructing the new-generation flexible micro-energy storage systems.
研究领域:
能量存储
·
材料科学
·
电化学
·
纳米技术
✓ 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
MICROPOROUS AND MESOPOROUS MATERIALS
·
2017
·
IF 3.615
Xiaojun He,Xiaojing Li,Jingxian Wang,Hao Ma,Hao Zhang,Yuanyang Xie,Nan Xiao,Jieshan Qiu
3D interconnected graphene nanocapsules (IGNCs) were prepared by a template strategy coupled with in-situ chemical activation technique via using diverse polycyclic aromatic molecules as building blocks for supercapacitors . Benefiting from the synergistic effects of nano-MgO-template and in-situ KOH activation, the 3D IGNCs feature seemingly incompatible advantages of conductive and porous properties, possessing interconnected thin networks for high electron conduction, short hierarchical pores for fast ion transport, and abundant accessible active sites for ion adsorption. The specific surface area, pore size and pore volume mainly depend on the mass of raw materials and the annealing temperatures. When evaluated as electrodes for supercapacitors, IGNCs exhibit remarkably enhanced electrochemical characteristics such as high capacitance, good rate performance and cycle stability. This work opens up a facile way for high-efficiency preparation of 3D IGNCs from diverse aromatic hydrocarbon sources for energy storage to substitute conventional porous carbons .
研究领域:
材料科学
·
能源存储
·
纳米技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）