Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 15
·6928-6936
·
IF 8.867
Jingxin Zhao,Chaowei Li,Qichong Zhang,Jun Zhang,Xiaona Wang,Ziyin Lin,Juanjuan Wang,Weibang Lv,Conghua Lu,Ching-ping Wong,Yagang Yao
A series of high-performance all-solid-state, lightweight, and flexible asymmetric supercapacitors (ASC) were prepared using cabbage-like ZnCo2O4 as the positive electrode material, porous VN nanowires as the negative electrode material, and flexible carbon nanotube film (CNTF) as the collector. Excellent electrochemical performance was achieved with an areal capacitance of 789.11 mF cm−2 for the positive electrode and 400 mF cm−2 for the negative electrode. The assembled all-solid-state flexible ASC device possessed a specific capacitance of 196.43 mF cm−2, large voltage window of 1.6 V, and a volume energy density of 64.76 mW h cm−3. Moreover, the assembled device exhibited good cycling stability with 87.9% initial capacitance retention after 4000 cycles with the coulombic efficiency remaining close to 100%. In addition, the capacitance retention reached 95.7% after 2000 bending cycles, indicating its good flexible and mechanical stability.
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2025
·
IF 5.5
Tianli Han,Jing Xu,Kehao Tao,Chenchen Zhang,Lixing Li,Xu Ge,Xueke Liang,Panya Zuo,Yiwen Xie,Jinjin Li,Jinyun Liu
The shuttle effect of polysulfides is one of the most severe issues in lithium–sulfur (Li–S) batteries. Here, we develop a graphene quantum dot (GQD)-decorated hollow porous ZnO/ZnCo2O4 as a sulfur host, which effectively immobilizes polysulfides and thus achieves good electrochemical performances. Polar ZnO and ZnCo2O4 as double shields show strong adsorption toward polysulfides as demonstrated by using density functional theory calculations, GQDs in shells improve conductivity, and a hollow porous morphology accommodates volume changes of sulfur upon cycling. The ZnO/ZnCo2O4/GQDs@S cathode displays high performances including a stable capacity of 797 mAh g–1 after 200 cycles at 0.2 C, reversible rate performance after three rounds of measurements, and good tolerance under low and high temperatures. These findings will find important applications for engineering many high-performance materials for Li–S batteries and accelerating applications.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2015
·Vol. 3
·期 43
·21569-21577
·
IF 7.443
Zhaoqiang Li,Longwei Yin
A sandwich-like structure with reduced graphene oxide (RGO) wrapped MOF-derived ZnCo2O4–ZnO–C polyhedrons on nickel foam as an anode for high performance lithium ion batteries (LIBs) is for the first time reported via simply growing MOFs on Ni foam, and wrapping graphene oxide nanosheets on MOFs, and then annealing under a N2 atmosphere. It should be noted that the MOF-derived porous products are composed of carbon-coated spinel ZnCo2O4–ZnO nanoparticle polyhedrons. When tested as anodes for LIBs, the unique RGO/ZnCo2O4–ZnO–C/Ni sandwich-structured LIB anodes exhibit superior coulombic efficiency, excellent cycling stability and rate capability. The in situ formed carbon layers outside the ZnCo2O4–ZnO act as not only a conductive substrate but also a buffer layer for volume changes. The open pores in ZnCo2O4–ZnO–C polyhedrons provide sufficient electrolyte as well as serve as cushion space to further alleviate volume changes. The RGO nanosheets act as a flexible protector to firmly fix polyhedrons on the Ni foam, as well as a conductive substrate to wire up all the polyhedrons. The interconnected carbon layers and two high conductive substrates (RGO and Ni foam) together form an unhindered highway for charge transfer during discharge/charge processes, promising good electrochemical performance.
研究领域:
材料科学
·
电化学
·
纳米材料
·
能源存储
·
功能材料
·
固态化学
·
电极工程
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Jiawei Long,Tianli Han,Yingyi Ding,Chaoquan Hu,Jinyun Liu
Biomimetic materials are receiving increasing attention as potential candidates for secondary battery systems owing to unique structures and properties. Here, we develop a biomimetic composite composing of sea anemone-shaped hollow SnO 2 in-situ co-coating with ZnCo 2 O 4 nanoparticles encapsulated by a carbon shell. The biomimetic SnO 2 @ZnCo 2 O 4 @C-based Li-ion battery anode shows a stable capacity of 700 mAh g −1 after 350 cycles, a Coulombic efficiency exceeding 99% and a repeatable rate-performance. Low reaction barriers and rapid diffusion kinetics of Li ions are verified by using galvanostatic intermittent titration technique analysis. Moreover, a full cell composing of a SnO 2 @ZnCo 2 O 4 @C anode and a LiCoO 2 cathode exhibits 520 mAh g −1 ; while working as a slurry battery anode, the sea anemone-shaped SnO 2 @ZnCo 2 O 4 @C also displays high capacity and Coulombic efficiency after 100 cycles. The high performances of the biomimetic composite when working at different battery systems enable it to be applicable broadly.
研究领域:
材料科学
·
能源技术
·
电化学
✓ 已验证
DOI
高影响因子
TALANTA
·
2025
·
IF 6.1
Shaowen Chen,Dongfei Chen,Yujie Shi,Renjie He,Xiaochan Wang,Gang Liu,Guo Zhao
Accurate detection of Hg(II) in soil is critical due to their severe environmental and heath risks. However, interference from soil organic matter, particularly humic acid (HA), complicates electrochemical detection by forming stable complexes with Hg(II), suppressing signal in square wave anodic stripping voltammetry (SWASV). This study introduces a novel pretreatment method using oxygen vacancy-rich ZnCo 2 O 4 nanocages (OVs-ZnCo 2 O 4 HNCs) to activate peroxymonosulfate (PMS) and generate sulfate radicals (·SO 4 − ). These radicals disrupt HA-Hg(II) complexes, restoring Hg(II) to its free, electroactive state for accurate detection. Optimized parameters, including ZnCo 2 O 4 loading (9 mg), PMS concentration (6 mg/L), and activation pH (3), enabled maximum signal recovery within 1.5 min. Comprehensive characterization confirmed the efficient catalytic activity of OVs-ZnCo 2 O 4 HNCs. The method demonstrated high sensitivity (LOD = 0.27 μg/L) and robustness in real soil samples, highlighting its potential for environmental monitoring and heavy metal analysis.
研究领域:
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Physical Chemistry C
·
2023
·
IF 3.7
Nguyen Ngoc Huyen,Le Minh Tung,Tuan Anh Nguyen,Thi Lan Huong Phung,Pham Duc Thang,Nguyen Thanh Vinh,Quy Van Nguyen,Thi Kim Oanh Vu,Vu Dinh Lam,Vinh Khanh Le,Ngo Xuan Dinh,Anh-Tuan Le
The recent advancement in designing novel spinel nanostructures has opened virtually infinite possibilities for the development of high-performance electrochemical sensors to detect target species. The electrocatalytic activity of spinel structures can be enhanced by tuning the cation distribution; however, the role of cation distribution at tetrahedral ions on the electrochemical sensing responses has rarely been considered. Herein, the effect of cation distribution at tetrahedral sites (Td) in the spinel nanostructure ZnCo2O4 on the electrochemical sensing performance toward carbaryl (CBR) was first investigated. The ZnCo2O4 nanoflake samples with different cation ratios of Zn/Co at tetrahedral sites were designed by using a facile solvothermal method. We found that a higher Zn ion content at tetrahedral sites significantly enhanced the electron transfer ability through the electrolyte/electrode interface. More interestingly, a higher Co ion ratio between octahedral sites and tetrahedral (CoOh/CoTd) promoted the electrochemical oxidation process of CBR with a higher catalytic rate constant (kcat). Under optimized conditions, the ZnCo2O4-NF-based electrochemical nanosensor showed a linear response from 0.15 to 100 μM with a limit of detection of 0.05 μM and a high electrochemical sensitivity of 2.04 μA μM–1cm–2. The designed nanosensor also exhibited good repeatability, long-time stability, high anti-interference ability, and excellent recovery with fruit and vegetable samples. Furthermore, this study offers insights into the cation distribution-dependent electrocatalytic activities of spinel nanostructures, which is helpful to the design of advanced spinel nanostructure-based electrocatalysts for improving the electrochemical sensing performance.
研究领域:
材料科学
·
分析化学
·
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）