JOURNAL OF MATERIALS SCIENCE
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2020
·Vol. 56
·期 4
·3011-3023
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IF 3.553
Wang Jing,Li Jing,Liu Yuanyuan,Wang Meiri,Cui Hongtao
The cycling stability of electrode materials is a key for Faraday supercapacitors (FSs), especially the structure-unstable Ni(OH) 2 . There exist various strategies for stabilizing the structure of Ni(OH) 2 such as cobalt ions doping and mechanical support from substrate. However, these strategies have their own disadvantages. On the other hand, the combination of two or more strategies has the serious issues in materials synthesis. In this work, a branched nanosheets-interlaced structure of Co 2+ /Co 3+ -doped Ni(OH) 2 is built by a method of precursor template, which effectively applies two strategies including ions doping and self-supportive structure. Due to the synergistic contribution of these two strategies, the cycling stability of as-prepared material is significantly enhanced. This material also presents excellent high-rate capacity, and the as-assembled asymmetric supercapacitors (ASCs) show both high energy and power densities. These results prove that the effective combination of ions doping and self-supportive structure strategies is a promising route for the preparation of Ni(OH) 2 -based electrode materials with high performance.
研究领域:
材料科学
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电化学
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DOI
高影响因子
JOURNAL OF POWER SOURCES
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2026
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IF 8.4
Yuxin Hong,Wenwen Zhang,Chun Li,Yuchen Sun,Yuju Zhao,Yufeng Wu,Xu Feng,Jiahui Li,Chenhao Wu,Shanshan Yao
Lithium-carbon dioxide (Li-CO 2 ) batteries offer high theoretical energy density and significant potential for CO 2 utilization, yet their development is hindered by sluggish CO 2 reduction/evolution kinetics, large charge-discharge polarization, and the intrinsically poor electrical conductivity of the resulting Li 2 CO 3 discharge products. In this work, one dimensional conductive metal-organic framework, Ni 3 (hexahydroxytriphenylene) 2 (Ni 3 (HHTP) 2 ), are uniformly anchored onto a biomass-derived carbon wood (CW) membrane through a hydrothermal process to from a freestanding Ni 3 (HHTP) 2 @CW composite cathode. Benefiting from the synergistic integration of highly one dimensional conductive Ni 3 (HHTP) 2 nanorods and the hierarchical porous architecture of biomass-derived CW scaffold, the composite cathode provides abundant catalytic active sites and enables rapid electron/ion transport during electrochemical reactions. The Li-CO 2 battery employing Ni 3 (HHTP) 2 @CW cathode delivers an areal discharge capacity of 4.37 mAh cm −2 at 50 μA cm −2 with a low overpotential of 1.33 V, and demonstrates excellent cycling stability for over 800 cycles under a limited capacity of 100 μAh cm −2 at 100 μA cm −2 . In-situ XRD, in-situ EIS, and distribution of relaxation time analyses reveal enhanced charge-transfer kinetics and reversible formation/decomposition of Li 2 CO 3 on the composite cathode. This study provides a sustainable and effective strategy for designing low-cost, binder-free MOF/biomass-derived carbon composite cathodes for advanced Li-CO 2 energy storage systems.
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DOI
高影响因子
Molecular Catalysis
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2024
·
IF 3.9
Xiaoying Zhou,Shiyu Fang,Zihao Hu,Zuliang Wu,Jing Li,Wei Wang,Jiali Zhu,Shuiliang Yao,Erhao Gao
This study introduces a novel catalyst system comprising Pd nanoparticles loaded onto Mn-doped NiO for the efficient oxidation of methane (CH 4 ) at low temperatures. The loading of Pd nanoparticles onto the Mn-doped support has yielded a catalyst with exceptional activity and stability, as evidenced by the lowest T 50 temperature of 276 °C and a CH 4 conversion reaching 97% at 325 °C. The catalyst demonstrates optimized reaction kinetics with the lowest activation energy of 69.2 kJ mol –1 . The catalyst's superior performance is attributed to the synergistic effects of the Pd/Mn-NiO composite, which include a higher Pd 2+ /Pd 4+ ratio, increased adsorptive oxygen concentration (O ads /O total ), and a reduced Ni 3+ /Ni 2+ ratio. These characteristics collectively enhance the catalytic activity for CH 4 oxidation. The Mars-van Krevelen mechanism underpins the oxidation process, with Pd 2+ identified as the principal active site for CH 4 adsorption and dissociation. Diffuse reflectance infrared Fourier transform spectroscopy coupled with mass spectrometry elucidates the pathway of surface reactive oxygen species in the formation of key intermediates, such as formates, and underscores the accelerated decomposition of carbonate facilitated by the Pd modification on the Mn-NiO surface. The findings signify a significant advancement in the development of catalysts for environmental and energy-related applications, particularly in the mitigation of CH 4 emissions.
研究领域:
催化
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环境科学
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能源
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DOI
高影响因子
Sustainable Energy & Fuels
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2020
·Vol. 4
·期 4
·1780-1788
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IF 5.503
Jing Wang,Jing Li,Meiri Wang,Yuanyuan Liu,Hongtao Cui
Battery-type electrode materials such as Ni(OH)2 applied in Faraday supercapacitors could present a low cycling stability due to the microstructure damage of materials, originating from their cyclic volume swelling and shrinking. It is well established that the structural stability of materials is crucial for their cycling stability. However, the lack of knowledge about the structural relevance of materials to their cycling stability somehow results in a chaotic understanding on the material design. In this study, we try to reveal the structural relevance by comparing an orderly built nanostructure with a randomly packed nanostructure using Ni(OH)2 as the target material. It is found that the branched nanosheet-interlaced nanostructure of Ni(OH)2 has its self-supportive function in favor of its structural stability, thus promoting its cycling stability. Also, the orderly nanostructured Ni(OH)2 presents high electrochemical performance due to the reduced interfacial charge-transfer resistance and Warburg resistance.
研究领域:
材料科学
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电化学
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DOI
高影响因子
Journal of Materials Chemistry A
·
2021
·Vol. 10
·期 3
·1369-1379
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IF 12.732
Yegui Fang,Yusheng Fang,Ruoqi Zong,Zhouyang Yu,Youkun Tao,Jing Shao
One core reaction involved in many electrochemical energy conversion systems is the oxygen evolution reaction (OER), which usually dominates the overall polarization loss due to its sluggish kinetics. Activating O2 electrocatalysis on the catalyst surface requires effective regulation of the surface spatial and electronic structure to facilitate the in situ generation of active species. Here, we report an in situ surface reconstruction method to boost the activity of a Ni-based perovskite hydroxide, NiSn(OH)6, for OER catalysis. The surface reconstruction is modulated by anodic polarization during the OER process, building a Ni3+-containing amorphous layer with selective Sn etching. Taking advantage of the in situ surface amorphization that facilitates the generation of active metal oxy(hydroxide) species, a significant performance enhancement is achieved on NiSn(OH)6. Theoretical calculations further demonstrate that the Sn vacancies on the surface optimize the electronic structure of the Ni sites and promote the adsorption of the reaction intermediates.
研究领域:
电化学
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催化
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材料科学
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表面科学
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2023
·Vol. 58
·期 23
·9633-9645
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IF 4.5
Hu Rongqin,Mu Zhaode,Gong Feng,Qing Min,Yuan Yonghua,Bai Lijuan
Human epididymis protein 4 (HE4) is a highly sensitive and specific biomarker for diagnosing ovarian cancer. In this work, a new electrochemical aptasensor for rapid and sensitive detection of HE4 was constructed. Firstly, metal–organic framework/ketjen black (NH 2 -MIL-53(Al)/KB) composite with abundant amino groups and large specific surface area was prepared as signal amplifier to anchor gold nanoparticles (AuNPs). Subsequently, signal probe (SP) and a large amount of electroactive toluidine blue (Tb) were attached on AuNPs to form the tracer label, producing a distinct electrochemical detection signal. Moreover, Ni 3 (HITP) 2 was modified by poly(diallyldimethylammonium chloride, PDDA) to obtain PDDA/Ni 3 (HITP) 2 , and then it was covered with deposited gold nanocrystals (DpAu) to form the sensing platform, which increased the electrical conductivity, specific surface area and the loading of triple-helix assembled probes (TAP). Target HE4 was bound to its aptamer in the outer layer of the TAP, leaving a separate capture probe (CP) on the electrode surface that can bind with the tracer label. The proposed aptasensor for HE4 detection showed a wide linear range from 1 to 10 nM with a detection limit of 0.41 fM. In addition, the aptasensor has good selectivity, stability and reproducibility. More importantly, this method showed satisfactory results in clinical serum sample analysis compared with ELISA, possessing application prospects in ovarian cancer diagnosis.
研究领域:
生物传感器
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分析化学
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纳米技术
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癌症诊断
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电化学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）