FUEL
·
2022
·
IF 8.035
Yanfei Chen,Yukun Lu,Zekun Guan,Shoujie Liu,Chao Feng,Guangxun Sun,Jilei Liang,Yuan Pan,Chenguang Liu,Yunqi Liu
Herein, a novel single-molecule confinement-sulfurization strategy was proposed to construct ultrafine Co-MoS 2 monolayer catalysts by using oil-soluble single-molecule polyoxometalates (POMs), (DODA) 6 Co 2 Mo 10 , as precursors. Well-defined Co 2 Mo 10 -POM, acting as molecular pre-assembling platform, is introduced for the atomically precise construction of bimetallic sites. Highly efficient conversion of VR under severe condition is realized with (DODA) 6 Co 2 Mo 10 . The origin of prominent catalytic performance can be attributed to the in-situ formation of ultrafine single-layered Mo-based nanosheets with abundant exposed CoMoS active sites. By combining synchrotron radiation-based X-ray absorption spectroscopy and density functional theory calculations, we further discover that there is clearly intimate interaction between Mo and Co atoms and the dissociation of molecular hydrogen at CoMoS phases is energetically preferred, leading to remarkable hydrogenation and coke suppression activity. This work highlights an idea on the rational design and targeted synthesis of ultrafine bimetallic catalysts for slurry phase HCK with dramatically synergistic catalysis.
研究领域:
化学工程
·
催化材料科学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Meilan Pan,Xue Zhang,Chenglei Pan,Jiong Wang,Bingjun Pan
Strategies for harmonizing the construction of an active site and the building of electron transport for a hybrid MoS2 catalyst are crucial for its application in electrochemical reactions. In this work, an accurate and facile hydrothermal strategy was proposed to fabricate the active center of Co–O–Mo on a supported MoS2 catalyst by forming a CoMoSO phase on the edge of MoS2, yielding (Co–O)x-MoSy (x = 0, 0.3, 0.6, 1, 1.5, or 2.1). The results show that the electrochemical performances (hydrogen evolution reaction (HER), oxygen evolution reaction (OER), and electrochemical degradation) of the yielded MoS2-based catalysts were positively correlated with the Co–O bonds, verifying the significant role of Co–O–Mo as the active center. The fabricated (Co–O)-MoS0.9 presented an extremely low overpotential and Tafel slope in both HER and OER, and it also demonstrated excellent BPA removal in the electrochemical degradation reaction. As compared with the Co–Mo–S configuration, the configuration of Co–O–Mo not only serves as the active center but also provides a conducting channel to facilitate electron conductivity with more accessible charge transfer at the electrode/electrolyte interface, which is favorable for electrocatalytic reaction. This work offers a new perspective for the active mechanism of metallic-heteroatom-dopant electrocatalysts and further boosts research on the development of noble/non-noble hybrid electrocatalysts in the future.
研究领域:
电化学
·
材料科学
·
催化
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF CATALYSIS
·
2023
·
IF 7.3
Zhenping Cai,Yongxin Ding,Jiayin Zhang,Panjie Yu,Yongde Ma,Yanning Cao,Ying Zheng,Kuan Huang,Lilong Jiang
Dispersed metal sulfides are promising catalysts for the hydroconversion of biolipids to produce second-generation biodiesel. In this work, oil-soluble Mo-based ionic liquids (ILs) were innovatively utilized as the precursors for in situ generation of MoS 2 catalysts for the hydroconversion of biolipids. Taking methyl palmitate as the model compound, the excellent activity of in situ generated MoS 2 from ionic liquid Mo-based precursors was obtained. The turnover frequencies (TOFs) reached up to 1.6 × 10 2 h −1 for methyl palmitate conversion and 83 h −1 for hexadecane (C 16 ) yield at 320 °C and 0.5 h (42% conversion) under solvent-dilute conditions. The structures of in situ generated MoS 2 catalysts were characterized to provide explanations for the catalytic results. Based on the product distributions, the pathway of methyl palmitate hydroconversion was proposed, and the kinetics of methyl palmitate hydroconversion was analyzed in further detail. Applying the Mo-based ILs in the hydroconversion of methyl palmitate and palm oil under solvent-free condition also granted high conversions of feeds and selectivities of HDO products.
研究领域:
催化
·
化学工程
·
可再生能源
·
绿色化学
✓ 已验证
产品关联
DOI
高影响因子
Energy Storage Materials
·
2023
·
IF 20.4
Zhanwei Xu,Yuchuan Ren,Xuetao Shen,Kai Yao,Jiayin Li,Hao Luo,Liang Li,Zhi Li,Jianfeng Huang
Lithium-sulfur batteries attract great interest due to their high energy density, sulfur abundance and environment friendly. However, the shuttle effect of lithium polysulfide and serious capacity fading especially at high sulfur loading remains a challenge for their commercial applications. In this work, we propose a scalable and feasible strategy to construct a flexible host for sulfur and catalyst carrier, in which polytetrafluoroethylene is employed as a precursor and in-situ polymerized into nanofibers to link acetylene black (PTFE NF/AB) through a blend and low temperature (∼ 180 °C) treatment process. The PTFE NF/AB exhibits semi-confined architecture for sulfur accommodation, electrolyte infiltration and electron transformation. Impressively, the electrode achieves a high areal capacity of 14.6 mAh cm −2 at the current density of 4.82 mA cm −2 with a sulfur loading of 20.6 mg cm −2 . Moreover, the PTFE NF/AB architecture can be employed as the catalyst supports. The capacity can be further enhanced to 17.4 mAh cm −2 when MoS 2 fabricated into the PTFE NF/AB using a ball mill approach. Assembled into a pouch cell, the PTFE NF/AB architecture delivers a high capacity of 825.4 mAh g −1 in the folded state, showing its excellent potential in the high-energy flexible territory.
研究领域:
储能技术
·
材料科学
·
纳米技术
·
电化学
·
柔性电子学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）