ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Xiaohui Peng,Mingzhe Li,Lihua Huang,Qizhe Chen,Weiwei Fang,Yuyang Hou,Yusong Zhu,Jilei Ye,Lili Liu,Yuping Wu
Developing ideal Li–O2 batteries (LOBs) requires the discharge product to have a large quantity, have large contact area with the cathode, and not passivate the porous surface after discharge, which put forward high requirement for the design of cathodes. Herein, combining the rational structural design and high activity catalyst selection, minor amounts of RuO2-incorporated Co3O4 nanoneedles grown on carbon cloth are successfully synthesized as binder-free integrated cathodes for LOBs. With this unique design, plenty of electron–ion–oxygen tri-phase reaction interface is created, the side reaction from carbon is isolated, and oxygen reduction reaction/oxygen evolution reaction (OER) kinetics are significantly facilitated. Upon discharge, film-like Li2O2 is observed growing on the needle surface first and eventually ball-like Li2O2 particles form at each tip of the needle. The cathode surface remains porous after discharge, which is beneficial to the OER and is rare in the previous reports. The battery exhibits a high specific discharge capacity (7.64 mAh cm–2) and a long lifespan (500 h at 0.1 mA cm–2). Even with a high current of 0.3 mA cm–2, the battery achieves a cycling life of 200 h. In addition, punch-type LOBs are fabricated and successfully operated, suggesting that the cathode material can be utilized in ultralight, flexible electronic devices.
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
GREEN CHEMISTRY
·
2024
·
IF 9.3
Genyan Hao,Tao Zhao,Qiang Fang,Yunzhen Jia,Dandan Li,Dazhong Zhong,Jinping Li,Qiang Zhao
Exploring Earth-abundant and efficient electrocatalysts to replace Ir and Ru for the acidic oxygen evolution reaction (OER) is essential to reduce the cost of clean hydrogen production. Here, we show that trace amounts of electronegative non-metallic element fluorine (F)-doped Co3O4 nanoneedles improve the activity and stability of Co3O4. The F-doped Co3O4 nanoneedles supported on carbon paper (F-Co3O4/CP) exhibit an overpotential of 350 mV at 10 mA cm−2 for the acidic OER. In addition, their performance remains consistent after continuous operation for 80 h. Detailed investigations reveal that introducing an anion promotes the enrichment of OH on the surface of Co3O4 and prevents acid corrosion, thereby enhancing the intrinsic OER activity and stability. Theoretical calculations further indicate that F doping can effectively improve electron transfer and optimize the energy barrier for the formation of *OOH intermediates, which significantly improves OER performance. This study provides guidance for designing efficient and stable non-noble metal acidic water oxidation catalysts.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Donghua Jia,Feng Zheng,Yaxuan Li,Yingying Niu,Yue Yang,Xiaodong Mao,Qiang Zhen,Peng Li,Yi Yu
In this work, two-dimensional V 2 O 5 nanosheet arrays/one-dimensional Co 3 O 4 nanoneedle arrays (2D VNSAs/1D CNNAs) composite is successfully prepared on nickel foam substrate. A variety of structural characterization techniques (SEM, XRD, EDS, TEM, and XPS) show that the as-prepared composite is V 2 O 5 monocrystal with a layered structure grafting by Co 3 O 4 polycrystal with a 1D needle-like structure. The VNSAs/CNNAs composite is used as supercapacitor electrode material. In a three-electrodes system, it shows high specific capacitance (C s ) values (1023 F g −1 @5 mV s −1 from CV curve and 826 F g −1 @0.5 A/g from GCD curve), a high coulombic efficiency (98.6 %@10 A/g), a good cyclic stability (92.7 % after 6000 cycles), a low charge transfer resistance (2.7 Ω), and a fast ionic diffusion rate (2.01 × 10 −8 cm 2 s −1 ). In a two-electrodes system, the assembled VNSAs/CNNAs//VNSAs/CNNAs symmetric supercapacitor has C s values of 445 F g −1 @5 mV s −1 and 363 F g −1 @0.5 A/g. Its cycle stability and rate capability could reach up to 92.3 % and 90.7 % after 6000 cycels, respectively. It also shows a high energy density (E d ) of 127.3 Wh kg −1 @400 W kg −1 and can retain 72.2 Wh kg −1 @8000 W kg −1 . The excellent electrochemical properties indicate that VNSAs/CNNAs composite can greatly increase the E d of supercapacitors.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 7
·3228-3237
·
IF 10.733
Yu Ouyang,Haitao Ye,Xifeng Xia,Xinyan Jiao,Guangmin Li,Sadaf Mutahir,Liang Wang,Daniel Mandler,Wu Lei,Qingli Hao
Binder-free electrodes with core–shell structures have shown great potential in a variety of important energy storage systems. In order to endow the core–shell hierarchical structure with enhanced electrochemical properties, rationally designed and fabricated hierarchical structures with controllable morphology and great electrical conductivity are highly desired. In this work, a uniform dendritic S-Co3O4@NiCo2S4 hierarchical structure grown on Ni foam was successfully designed and synthesized via sulfur-doping of Co3O4 (S-Co3O4) as the inner core with enhanced conductivity. The hierarchical electrode exhibited high areal capacity (10.9 mA h cm−2 at a current density of 8 mA cm−2), a good rate performance (72.5% retention after increasing the current densities from 8 to 30 mA cm−2), and excellent cycling stability (97.3% retention after 5000 cycles). Moreover, a hybrid energy storage battery-supercapacitor device, constructed from a S-Co3O4@NiCo2S4 positive electrode and an active carbon (AC) negative electrode, showed high energy density and power density. Contributing to short ion diffusion, large electroactive sites and low contact resistance, our work not only demonstrates a promising electrode for energy storage battery-supercapacitor hybrid (BSH) devices, but also provides an attractive strategy for the design of electrode materials.
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
JOURNAL OF SOLID STATE CHEMISTRY
·
2025
·
IF 3.5
Xiao Duan,Fusen Lv,Jiaqi Liu,Tie Liu,Shuang Yuan
MXenes exhibit a distinctive two-dimensional (2D) open-layered architecture, characterized by an extensive specific surface area, abundant surface functional groups, and excellent electrical conductivity, rendering them a promising candidate for the anode material in lithium-ion capacitors (LICs). However, the inherent tendency of MXenes towards interlayer restacking and structural degradation severely impedes ion transport kinetics, leading to compromised electrochemical performance. To address this issue, a straightforward hydrothermal synthesis strategy was proposed for fabricating porous Co 3 O 4 nanoneedle/MXene composites via in-situ grown self-assembly. The two-dimensional layered structure, high electrical conductivity, and abundant surface functional groups of MXene enable efficient ion intercalation, while Co 3 O 4 contributes enhanced theoretical capacity and rich oxidation states. These two components form a mutually supportive synergistic effect. This synergy not only shortens the ion/electron transport pathways within the MXene matrix but also mitigates the agglomeration and volume expansion phenomena associated with the Co 3 O 4 nanoneedles. Therefore, the obtained Co 3 O 4 MXene electrode maintained a specific capacity of 632 mA h g −1 after 1000 cycles at a high current density of 1 A g −1 , far exceeding the original MXene electrode. Assembled with activated carbon to form Co 3 O 4 nanoneedles/MXene//AC lithium-ion capacitors (LIC), achieving a high energy density of 254 Wh k g −1 and a maximum power density of 4000 W kg −1 . The excellent performance of the porous and porous Co 3 O 4 nanoneedle/MXene composite reflects its potential as a high-performance anode material for LIC.
研究领域:
材料科学
·
电化学
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储能技术
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纳米技术
·
无机化学
✓ 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）