INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Xiutong Yan,Biyun Lin,Chuangyu Ning,Xin Wang,Zhihong Chen
CdS is a promising candidate for visible-light-driven photocatalytic H 2 -evolution, but its practical application is still limited by self-photo-corrosion and noble co-catalysts needing. Herein, CdS/NiCo-MOFs (CM) heterojunction was synthesized by an in-situ hydrothermal method , where NiCo-MOFs (BMOFs) acted as platform to inhibit the aggregation of CdS nanoparticles . Furthermore, BMOFs provided dual-reaction sites to improve the photocatalytic H 2 -evolution speed and suppress the photo-corrosion of CdS by taking its Ni-linker as catalytic active sites for water splitting and Co-linker as hole trapping sites to suppress the self-oxidation between S 2− and holes. Therefore, the optimal CM-20% exhibited a remarkable photocatalytic H 2 -evolution rate of 1.810 mmol g −1 h −1 under sunlight irradiation, which is 4.55 times higher than that of CdS. Moreover, CM-20% maintained this high photocatalytic H 2 -evolution rate for 100 h reaction, which for CdS is just 50 h. This research provides insight into designing high-efficiency and photo-stable sulfide-based photocatalyst systems for H 2 -evolution.
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
高影响因子
Journal of Energy Storage
·
2023
·
IF 9.4
Shengnan Lin,Tingan Zhang
With the upgrading of mobile and portable electronic devices, people have higher requirements for the performance of batteries , and anode materials, as one of the factors affecting the electrochemical performance of lithium ion storage, have become a hot spot of widespread concern. This paper illustrates a creative and effective strategy to synthesize four different NiCo-MOFs materials. After studying their respective unique structural features, it was found that, unlike the topologies of NiCo-PTA (terephthalic acid) and NiCo-H 3 BTC (trimesic acid), the substitution of Ni and Co for N occurred in NiCo-EDTA (ethylenediaminetetraacetic acid) and NiCo-BI (benzimidazole). Electrochemical studies show that NiCo-PTA, NiCo-EDTA, NiCo-H 3 BTC, and NiCo-BI all have high initial discharge specific capacities of 1770.41576.11905.1 and 1877.5 mAh/g at a current density of 100 mA/g. When NiCo-EDTA and NiCo-BI are cycled at a current density of 100 mA/g, the specific capacity decreases more slowly than NiCo-PTA and NiCo-H 3 BTC. Similarly, the capacity of NiCo-PTA and NiCo-H 3 BTC almost began to rise at the 70th cycle, the capacity of NiCo-BI began to rise at the 67th cycle, and NiCo-EDTA showed the slowest rise at the 78th cycle, they all showed excellent cycle performance.
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
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Shuang Liang,Guanzhihui Wang,Likun Dong,Xiaobo Yang,Bao Zhou,Zhuoqi Duan,Zaixin Xie,Yongmao Hu
Metal-organic frameworks (MOFs) are great precursors and templates for preparing adsorbents, catalysts and electrodes due to the porous structure and high specific surface area. We report a promising approach to prepare nanocrystalline Co, Ni sulfides (CNS) embedded and N self-doped porous carbon (NPC) matrix composites derived from NiCo-MOFs. The CNS@NPC composite was investigated as electrodes for hybrid supercapacitors (HSCs). The prepared electrode achieved specific capacitance of 2789 F g −1 at 1 A/g, and high capacitance retention of 88.93% after 6000 galvanostatic charge–discharge (GCD) cycles under 10 A/g. The HSC structured with CNS@NPC//AC achieved an energy density of 46.79 Wh kg −1 at power density of 800 W kg −1 . Meanwhile, specific capacitance of 131.56 F g −1 at 1 A/g and capacitance retention of 99.17% over 6000 GCD cycles under 3 A/g were obtained. Space confinement by the carbon skeleton effectively prevents the aggregation of the redox active nanocrystalline and improves the durability of the electrode. Meanwhile, the carbon skeleton provides abundant charge transfer channels to enhance the redox reaction. In other words, synergistic effect of the carbon skeleton and the active redox nanocrystalline significantly improves the electrochemical properties of the composite.
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
FUEL
·
2022
·
IF 8.035
Minghao Zhou,Chengjun Tang,Jing Li,Haihong Xia,Peng Liu,Junming Xu,Changzhou Chen,Jianchun Jiang
Ni-based MOFs catalysts are promising candidates that can be used to achieve biomass valorization following the process of selective hydrogenolysis process. Here we report a spherical NiCo-based MOFs catalyst, which provides a larger BET surface to enhance 2-phenoxy-1-phenylethan-1-ol molecules enrichment and promote the hydrogenolysis on spherical NiCo-based MOFs catalyst surface. In addition, the synergistic interaction between Ni and Co species also shows great effect on catalytic hydrogenolysis of 2-phenoxy-1-phenylethan-1-ol molecules and enzymatic lignin. The yields of ethylcyclohexane and cyclohexanol are dramatically improved to more than 90 mol% over Ni3Co1-based MOFs catalyst under nitrogen atmosphere. Various lignin dimers derivatives are investigated over Ni3Co1-based MOFs catalyst, which indicates oxygen-containing functional groups played a critical role in the hydrogenolysis process. Isopropanol is used as solvent in the hydrogenolysis of 2-phenoxy-1-phenylethan-1-ol molecules and enzymatic lignin. 21% of H 2 is observed in the GC/MS, suggesting that it is a catalytic transfer hydrogenolysis process. Catalytic hydrogenolysis of enzymatic lignin is also carried out under 280 ℃ over optimal Ni3Co1-based MOFs catalyst for 6 h, giving highest lignin oil yield (75.6 wt%) and lower O/C ratio (0.17). This work can be extended to different biomass valorizations to promote the catalytic behavior of spherical MOFs catalysts.
研究领域:
催化化学
·
生物质能
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2026
·
IF 3.2
Jianan Liu,Xiangning Chen,Jiandi Huang,Menghan Li
DMF-CH 3 OH solvothermal mixed solvent. • High capacitance value of 2495 F/g at 1 A/g. • Capacitance value 175 F/g at 1 A/g of the ASC device. • Energy density of 54.3 Wh·kg −1 at power density of 744.5 W kg −1 of ASC device. Metal-organic frameworks (MOFs) have attracted great research attention as electrode materials for supercapacitors due to their unique advantages. In this work, a series of NiCo-MOFs were synthesized through a simple solvothermal method. This work mainly adopts DMF and methanol as the mixed solvent in the solvothermal process. By adjusting the ratio of DMF to methanol (1:1-4:1), NiCo-MOFs with similar morphologies but different electrochemical properties were obtained. Among the four solvent ratios, NiCo 21 -MOF (DMF:CH 3 OH = 2:1) exhibits excellent electrochemical performance with a specific capacitance of 2495 F/g at 1 A/g. The NiCo 21 -MOF//AC asymmetric supercapacitor (ASC) device exhibits a specific capacitance of 175 F/g at 1 A/g, and the energy density and power density are 54 Wh kg −1 and 744 W kg −1 , respectively. After 5000 cycles, the ASC device still retains 85% of its initial capacitance, with good stability. In conclusion, this work achieves excellent electrochemical performance of NiCo-MOFs by adjusting the solvent ratio, providing a new strategy for synthesizing NiCo-MOFs with excellent electrochemical properties. Download: Download high-res image (313KB) Download: Download full-size image
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）