ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Weifeng Jing,Mei Wang,Ying Li,Hai-Ru Li,Huinian Zhang,Shengliang Hu,Huiqi Wang,Yan-Bing He
The pore structural designability of wood-derived hard carbons (WDHCs) lays an optimal foundation for acquiring a cost-efficient and green anode material for sodium-ion batteries. Here, a WDHCs material was reported for high-capacity and cycling-stable sodium storage through a pore forming-opening strategy. Associated with the natural holey texture of wood, the WDHCs displays a hierarchical pore structure by a precise chemical treatment and a high-temperature carbonization, creating the straight channels and plentiful closed nanopores. This well-constructed channel structure is conducive to the penetration of electrolyte and the transport of sodium ions. The closed nanopores constructed by the curved graphene layers are gradually unfolded upon cycling, thus providing higher reversible capacity in the platform zone. The surface-controlled pseudocapacitive reaction favored ultrafast ion transport mainly contributes to sodium storage capacity. As a result, the developed optimal anodes harvest a high sodium storage capacity of 439 mAh g −1 at 0.1 A g −1 , and excellent long-term cycling stability of 248 mA h g −1 at 0.1 A g −1 over 500 cycles as well as the capacity retention close to 100%. The galvanostatic intermittent titration technique combined with electrochemical impedance spectroscopy proved that the WDHCs anode has fast charge transport kinetics, thus exhibiting excellent rate performance.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
Nano Energy
·
2022
·
IF 19.069
Cheng Yan,Xiankan Zeng,Qungui Wang,Xiaodong Peng,Wen Li,Jingjing Cao,Yue Gao,Xiang Chu,Xuehai Fu,Shiyu Yang,Yongjian Chen,Weiqing Yang
To fundamentally understand the underlying interfacial physics of hole transporting layer is a key to rotationally engineer high-performance light-emitting diodes (LEDs). Here, we unravel the hole interlayer-dependent interfacial energetics of LEDs via combining imaged contact potential/polarization difference, and multi-time scale capacitance/voltage response. A universally existing but undesired stagnation of current density with voltages, under the direct contact of light-emitting Poly-TPD with electrodes, was proved to be rooted from the alternant dominance of capacitance/resistance behaviors with alternating strong/weak polarizations of Poly-TPD. The introduction of hole interlayer (PEDOT:PSS) with more disordered polarization direction and greater intensity can build plentiful carrier hopping channels and ensure the rapidly dynamic charge transfer from electrodes to Poly-TPD, conducing to the increased capacitive reactance contribution at low voltages and inductive effects at high voltages. Also, we clarify its frequency-response difference for emerging high-speed modulation application. This discovery might enable us to explore the next-generation high-efficiency display and optical data-communication.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 7
·1-13
·
IF 2.8
Yu Haichao,Chen Xuan,Zhou Jie,Wang Hui
Zn-ion hybrid capacitors (ZIHCs) have been deemed a promising candidate for energy storage equipment to overcome the primary drawback of supercapacitors—low energy density. Herein, inspired by the laminated structure of chitin fibrils, molten salt strategy is proposed to engineer functional carbon as cathode material for ZIHCs, for the first time. Orthogonal design was adopted to ascertain the optimum synthetic conditions for the chitin-derived NaCl-templated and NaNO 3 -activated carbons (CNNs). The resultant C2NN1-800-1-5 possesses high surface area of 1256 m 2 g −1 and rich surface heteroatom content of 11.3 at%, as well as numerous thin intertwined nanofibre bundles. Associated with the synergy of surface capacitive reaction and diffusion battery behavior, the Zn//ZnSO 4 ( aq , 2 M)//C2NN1-800-1-5 ZIHC can be conducted in a relatively broad potential window ranging from 0 to 1.8 V and manifests remarkable energy density of 133.4 Wh kg −1 at 180 W kg −1 . Moreover, charge/discharge cycling further revealed that this device can retain 100% of its initial capacity, together with almost 100% coulombic efficiency after 10,000 cycles at 6 A g −1 . The study emphasizes the green synthesis of heteroatom-doped hierarchical porous carbon cathode material, notably facilitating the rapidly increasing popularity of Zn-ion hybrid energy storage devices.
研究领域:
材料科学
·
能源存储
·
绿色化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Wenqian Yan,Kunmeng Zhu,Yi Cui,Yanhan Li,Tao Dai,Sheng Cui,Xiaodong Shen
A new material of Ag-SnO 2 /rGO aerogel is fabricated by the sol-gel method and freeze-drying technique. The SnO 2 particles are tightly arranged on the rGO sheets to form a p-n heterojunction , and the rGO aerogel possesses abundant pore structures for effective adsorption. Besides, the Ag particles are dispersed on the surface as a catalyst to improve the internal electron mobility, further promoting the gas-sensing performance. To be noted, the Ag-SnO 2 /rGO aerogel can exhibit a response of 2.13 towards 50 ppm NO 2 at RT instead of heating conditions, and shows a cyclic capacitance property of redox. Moreover, the non-linear growth between gas concentration and response is observed, which proves the chemical adsorption that results in the high selectivity.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）