CHEMICAL ENGINEERING JOURNAL
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2023
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IF 15.1
Peng Liu,Jianyue Yan,Hao Huang,Wenbo Song
Electrochemical reduction of nitrate to ammonia is an eco-friendly strategy to remove the nitrate pollution in waste effluents. Developing new-type electrocatalysts with high activity for NO 3 RR has attracted worldwide attention. Owing to the numerous active single-metal sites, electric conductivity and ordered in-plane porous structure, conductive metal–organic frameworks (cMOFs) are promising alternative to construct the next-generation NO 3 RR electrocatalysts. In this work, a bimetallic cMOF (Cu x Co y HHTP) is proposed for efficient NO 3 – electroreduction to ammonia and the synergy effect between different types of single-metal sites is also revealed. As the result, the optimal Cu 1 Co 1 HHTP exhibits an outstanding electrocatalytic activity with a high NH 3 yield rate of 299.9 μmol h −1 cm −2 and a large Faradic efficiency of 96.4%. Both theoretical and experimental results reveal that the Co sites can affect the electron structure of Cu sites in Cu 1 Co 1 HHTP slab and decrease the ΔG of potential determining step in NO 3 RR process. Moreover, the Co sites bring a higher selectivity to Cu active sites for reducing *NO 2 to *NO, rather than the desorption of NO 2 – . The bimetallic c-MOFs strategy will innovate the design concept of next-generation catalyst, paving the way to investigate catalytic mechanism of single-metal-atom and open up their application prospects.
研究领域:
材料科学
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电化学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
TALANTA
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2022
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IF 6.556
Wei Huang,Yao Chen,Lingyan Wu,Mei Long,Zhifeng Lin,Qianqian Su,Fuli Zheng,Siying Wu,Huangyuan Li,Guangxia Yu
L-tryptophan (Trp) is an essential amino acid for humans and plays crucial roles in many metabolic functions. Trp levels can be used for diagnosing different kinds of metabolic disorders and the symptoms associated with those diseases. Herein, a novel, simple and sensitive sensor based on 3D peony-like bimetallic conductive MOFs (Co–Ni-MOFs) was fabricated for the electrochemical determination of Trp. The bimetallic conductive MOFs were synthesized by a facile one-pot hydrothermal process. On account of the synergy between the Ni 2+ and Co 2+ ions, the bimetallic Co–Ni-MOFs showed excellent electrochemical performance, including good conductivity, large effective surface areas, and high electrocatalytic reactivity toward the oxidation of Trp. Consequently, the Co–Ni-MOFs-modified electrodes obtained a wide linear range from 10 nmol L −1 to 300 μmol L −1 and a low detection limit of 8.7 nmol L −1 (S/N = 3) for Trp. Additionally, the prepared sensor also displayed high selectivity, long-term stability and reproducibility. Moreover, the proposed sensor was successfully applied to determine the levels of Trp in the plasma of mice after cadmium intoxication.
研究领域:
生物化学
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分析化学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INORGANIC CHEMISTRY
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2022
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IF 5.436
Xihao Lin,Shilian Lai,Guoyong Fang,Xinhua Li
Most metal–organic frameworks (MOFs) cannot be used as electrode materials for supercapacitors because of their high costs, poor stabilities in aqueous solutions, inferior intrinsic electrocatalytic activities, and poor conductivities. Herein, the application of two nickel(II) cluster-based pillar-layered MOFs, Ni-mba-Na ([Ni8(mba)6(Cl)2Na(OH–)3]n, H2mba is 2-mercaptobenzoic acid) and Ni-mba-K ([Ni8(mba)6(Cl)2K(OH–)3]n), as electrode materials are reported. They differ from conductive MOFs because they are insulators with small specific surface areas (<10 m2 g–1), and H2mba is an inexpensive raw material. The conductivities of Ni-mba-Na and Ni-mba-K at 30 °C were 4.002 × 10–10 and >10–11 S cm–1, respectively. They showed excellent supercapacitor performance and stabilities and high inherent densities and specific capacitances. The specific powers of their asymmetric supercapacitors could reach up to 16,000 W kg–1; the specific energies of Ni-mba-Na and Ni-mba-K were 16.9 and 21.8 Wh kg–1, respectively. Design recommendations for these MOFs are provided based on their structure and performance differences. This paper shows a novel application of nonconductive MOFs in the energy storage field and design of high-performance electrode materials for supercapacitors.
研究领域:
材料科学
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能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
LANGMUIR
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2024
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IF 3.7
Xiaotian Zhang,Zipeng Jin,Kunting Li,Yisheng Hu,Lei Xu,Baiyan Li
Despite their high surface area, remarkable porosity, and efficient charge transfer mechanisms, conductive MOFs have found limited utilization within the domain of photocatalysis. In this study, we synthesized a cutting-edge S-type Ni3(HITP)2/TiO2 heterojunction photocatalyst exhibiting outstanding light harvesting and prolonged lifetime of photogenerated electrons through an in situ synthesis approach. Compared with TiO2, the composite materials not only significantly increase the specific surface area by 4.07 times but also expand the visible light absorption edge from 400 to 1100 nm. The hydrogen production rate of Ti/Ni-3 reached 4.927 mmol·g–1·h–1, which is 4.51 times that of TiO2. The S-type interface charge transfer pathway of the Ni3(HITP)2/TiO2 composite material was inferred by band structure, in situ XPS, SPV, and free radical capture, which improves charge separation and extends the carrier lifetime to undergo directional migration driven by an IEF. This is the main reason for the improved photocatalytic performance of Ni3(HITP)2/TiO2 composite materials.
研究领域:
材料科学
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光化学
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催化
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）