INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Samuel Guemou,Fuying Wu,Pengzhou Chen,Jiaguang Zheng,Ting Bian,Danhong Shang,Alexei Pavlovich Levtsev,Liuting Zhang
Transition metal-based oxides have been proven to have a substantial catalytic influence on boosting the hydrogen sorption performance of MgH 2 . Herein, the catalytic action of Ni 6 MnO 8 @rGO nanocomposite in accelerating the hydrogen sorption properties of MgH 2 was investigated. The MgH 2 + 5 wt% Ni 6 MnO 8 @rGO composites began delivering H 2 at 218 °C, with about 2.7 wt%, 5.4 wt%, and 6.6 wt% H 2 released within 10 min at 265 °C, 275 °C, and 300 °C, respectively. For isothermal hydrogenation at 75 °C and 100 °C, the dehydrogenated MgH 2 + 5 wt% Ni 6 MnO 8 @rGO sample could absorb 1.0 wt% and 3.3 wt% H 2 in 30 min, respectively. Moreover, as compared to addition-free MgH 2 , the de/rehydrogenation activation energies for doped MgH 2 composites were lowered to 115 ± 11 kJ/mol and 38 ± 7 kJ/mol, and remarkable cyclic stability was reported after 20 cycles. Microstructure analysis revealed that the in-situ formed Mg 2 Ni/Mg 2 NiH 4 , Mn, MnO 2 , and reduced graphene oxide synergically enhanced the hydrogen de/absorption properties of the Mg/MgH 2 system.
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 7
·2712-2720
·
IF 6.4
Shuang Luo,Jien Li,Pengfei Xu,Xiangyu Han,Lin Chen,Chenguo Hu
Ni–Mn-based binary oxides are deemed as a promising commercial electrode material for supercapacitors (SCs) due to their low price, environmental friendliness and high theoretical capacitance. However, their low electrical conductivity and narrow potential window limit their electrochemical performance. Herein, we prepare a composite of Ni6MnO8 and MnCO3 grown in situ on activated carbon cloth (NMO-x@ACC, x = 1, 2, 3) at a low temperature as an electrode for aqueous supercapacitors. By a component optimization and morphology control strategy, nano-flake and wheat-shaped NMO-2@ACC (Ni/Mn = 1) shows outstanding capacitance performance up to 1450 mF cm−2 at 2 mA cm−2 within the 0–1 V potential window. The assembled NMO-2@ACC aqueous SC displays a wide potential window of 1.8 V in 1 mol L−1 LiNO3 electrolyte, and the maximum energy density reaches 4.061 mW h cm−3. After 6000 cycles, the capacitance remains at 90.1%, showing good stability. In addition, two devices connected in series can light up 72 LEDs for more than 2 minutes, which demonstrates an excellent practical application prospect. This strategy of proportion control and morphology optimization provides a new strategy for the preparation of high-performance Ni–Mn based electrode materials.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
Materials
·
2022
·Vol. 15
·期 24
·8847
·
IF 3.748
Jiying Li,Jiawei Long,Tianli Han,Xirong Lin,Bai Sun,Shuguang Zhu,Jinjin Li,Jinyun Liu
Semiconductor-based composites are potential anodes for Li-ion batteries, owing to their high theoretical capacity and low cost. However, low stability induced by large volumetric change in cycling restricts the applications of such composites. Here, a hierarchical SnO2@Ni6MnO8composite comprising Ni6MnO8nanoflakes growing on the surface of a three-dimensional (3D) SnO2is developed by a hydrothermal synthesis method, achieving good electrochemical performance as a Li-ion battery anode. The composite provides spaces to buffer volume expansion, its hierarchical profile benefits the fast transport of Li+ions and electrons, and the Ni6MnO8coating on SnO2improves conductivity. Compared to SnO2, the Ni6MnO8coating significantly enhances the discharge capacity and stability. The SnO2@Ni6MnO8anode displays 1030 mAh g−1at 0.1 A g−1and exhibits 800 mAh g−1under 0.5 A g−1, along with high Coulombic efficiency of 95%. Furthermore, stable rate performance can be achieved, indicating promising applications.Keywords:lithium-ion batteries;anode;semiconductor;hierarchical structure;capacity
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
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Wei Guo,Tao Yang,Lianjie Huang,Shuang Wang,Jinping Li
In this study, a MnNiO 3 /Ni 6 MnO 8 composite is synthesized under the hydrothermal condition of 120–160 ℃ through different growth time. The three-dimensional (3D) flower-like MnNiO 3 /Ni 6 MnO 8 nanospheres are successfully obtained under the reaction condition of 140 ℃ for 10 h. The unique 3D spherical structure of MnNiO 3 /Ni 6 MnO 8 with mesopores can facilitate the transport of electrolyte ions and generate more redox active sites. The specific capacity of MnNiO 3 /Ni 6 MnO 8 can reach 70.6 mAh/g at 1 A/g, and reserve 70.1% even at 10 A/g. What's more, the MnNiO 3 /Ni 6 MnO 8 composite displays excellent cycling stability that the capacity has almost no degradation after 6000 cycles at 3 A/g. In addition, the energy storage mechanism of MnNiO 3 /Ni 6 MnO 8 is also studied and the results show that it is a battery type electrode material dominated by diffusion-controlled process . Moreover, the as-prepared MnNiO 3 /Ni 6 MnO 8 nanospheres are further used to assemble a hybrid device. The device can provide a specific energy of 22.3 Wh/kg at a specific power of 1074.7 W/kg. The specific capacity of 122% is kept after 10000 cycles at 8 A/g, revealing its superior cycling stability. As expected, the commercial LEDs with different colors can be lit up by MnNiO 3 /Ni 6 MnO 8 //AC device, indicating that the as-prepared MnNiO 3 /Ni 6 MnO 8 electrode has good application potential.
研究领域:
材料科学
·
能源存储
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ChemSusChem
·
2019
·Vol. 13
·期 7
·1890-1899
·
IF 7.804
Jie Zhu,Guolin Cao,Yuan Zhou,Yunjiao Li,Junchao Zheng,Dianwei Zhang
Graphical Spray pyrolysis and a solvothermal method were used to prepare two types of NiO–MnCo 2 O 4 –Ni 6 MnO 8 hybrid anode materials to compare their physical and electrochemical properties. The samples had similar hierarchical nanostructures, but that prepared by the solvothermal method had a smaller and more uniform particle size and larger BET surface area whereas those prepared by spray pyrolysis exhibited more regular morphology and more stable surface chemical states. New materials with different morphologies, nanostructures, and components can have structural advantages for application in materials science. Multicomponent-active hybrid nanostructured materials are among the best candidates for application in electrode materials. Spray pyrolysis and solvothermal synthesis are two popular methods for the preparation of multicomponent-active hybrid nanostructured materials. In this study, the two types of NiO-MnCo 2 O 4 -Ni 6 MnO 8 hybrid anode materials for use in lithium-ion batteries were synthesized by two different methods (spray pyrolysis and solvothermal synthesis), and the differences in their physical and electrochemical properties were compared. The two types of anode material exhibited the same hierarchical hybrid composition, but some different physical characteristics, which affected their electrochemical performance.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Liping Wu,Min Qing,Zhaode Mu,Jing Zhou,Jianli Zuo,Lijuan Bai
As one of the specific markers for small cell lung cancer (SCLC), the clinical value for serum neuron-specific enolase (NSE) detection in diagnosis, monitoring and therapy of SCLC is considerable. Herein, a sensitive amperometric aptasensor was developed for the detection of NSE based on nickel-manganese oxide@acetylene black/platinum nanoparticles (Ni 6 MnO 8 @AB/PtNPs) composite as signal amplifier. The combination of Ni 6 MnO 8 , AB and PtNPs not only showed synergistically catalytic activity to hydrogen peroxide (H 2 O 2 ), but also possessed lots of binding sites for loading the thiol-terminated signal probes (TSPs) through Pt-S bonds. Additionally, nitrogen-doped carbon nanotubes/poly (diallyldimethylammonium chloride)/ZnO microflowers (N-CNTs/P/ZnO MFs) exhibited outstanding electric conductivity and was used as substrate material to load more biotin-terminated capture probes (BCPs). In the presence of the NSE, the TSPs and BCPs specifically recognized the NSE to form a sandwich-type electrochemical aptasensor, which exhibited a broad linear response range from 0.00001 ∼ 100 ng mL −1 and a low detection limit of 2.86 fg mL −1 (S/N = 3). In addition, the electrochemical aptasensor obtained favorable detection results in diluted human serum, indicating that it had potential application in clinical NSE detection.
研究领域:
生物医学工程
·
癌症诊断
·
材料科学
✓ 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）