APPLIED SURFACE SCIENCE
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2023
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IF 6.7
Chuanqiang Li,Xiang Liu,Tao Peng,Tong Zhang,Chuanchuan Lin,Yangyang Zhang,Qianqian Chai,Wenge Qiu,Liyun Song
A Co/Mn-based metal – organic framework was used as a precursor to synthesize oxygen-rich defects in binary Co – Mn oxides using mechanical-coordination chemistry method. The samples were characterized using X-ray diffraction, Raman spectroscopy, N 2 adsorption–desorption analysis, scanning-electron microscopy, X-ray photoelectron spectroscopy, electron paramagnetic resonance, and transmission-electron microscopy. H 2 -temperature-programmed reduction and O 2 -temperature-programmed desorption analyses were performed to examine the redox properties and mobility of the oxygen species in the catalysts, respectively. The sample obtained from Co/Mn-BTC-2/3 exhibited the highest catalytic activity for the total oxidation of propane, with a T 90 of 255 ℃ at 120 L g −1 h −1 . The considerable performance of the sample is associated with its smaller grain size , larger specific surface area, and abundant interface and oxygen defects. This study offers a simple strategy for the synthesis of Co/Mn-BTC with hexanuclear SBUs, further deriving to oxygen-deficient and high-performance propane elimination catalysts, which could potentially be applied on an industrial scale.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2021
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IF 5.816
Tuo Wang,Yifei Cao,Huimin Wu,Chuanqi Feng,Yu Ding,He Mei
In this work, N-Ni 1 Co 3 Mn 0.4 O/NF is synthesized as multifunctional electrocatalyst for hydrogen evolution (HER), urea oxidation reaction (UOR) and hydrazine oxidation reaction (HzOR). The optimal Ni/Co (molar ratio) and the amount of doping Mn are investigated, the sample with Ni/Co = 1:3 and the addition of 0.4 mmol Mn exhibits the best catalytic activity with the largest specific surface area. Then the two-electrode electrolyzers composed of N-Ni 1 Co 3 Mn 0.4 O/NF are constructed, and the results from experiments show that the voltage required for overall hydrazine splitting (OHzS) at 100 mA cm −2 is 0.272 V, 1.614 V lower than that of overall water splitting (OWS, 1.886 V), while the overall urea splitting (OUS) needs 1.669 V, 0.187 V lower than that of OWS, revealing the outstanding thermodynamic and kinetic advantages of OUS and OHzS. The superior performance may be attributed to the heterostructure between metal and metal oxide and N-doping, which can promote electron transfer and optimizes the decomposition of urea and hydrazine hydrate and hydrogen production , and the research on mechanism will be carried out in the future.
研究领域:
材料科学
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电化学
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催化化学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2019
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IF 6.393
Xiaodan Zhang,Ai Yuan,Xuanxiang Mao,Qiumeng Chen,Yuming Huang
We report that the Co/Mn oxides nanocomposite, obtained by directly pyrolying cobalt doped Mn-BTC precursor, is a new oxidase mimetic for colorimetric sensing of acid phosphatase (ACP). By tuning the molar ratios of cobalt ions to Mn-BTC (BTC = 1,3,5-benzenetricarboxylate) precursor, four bimetal Co/Mn-BTCs and their derivatives were obtained. These Co/Mn oxides showed 1.4-fold to 2.6-fold higher oxidase-like activity than that of Mn 2 O 3 derived from Mn-BTC, indicating that Co-doping is an effective way for improving and tuning oxidase-like activity of manganese oxides. The rambutan-like Co/Mn oxides with Co/Mn molar ratio of 0.33 (denoted CMO-0.33) in the MOFs precursors exhibited the highest oxidase-like activity. The estimated Michaelis constant for 3,3′,5,5′-tetramethylbenzidine (TMB) was 2.26-fold lower than that of Mn 2 O 3 , indicating its stronger affinity to TMB. Based on the inhibitory effect of ascorbic acid (AA) on the TMB-CMO-0.33 system, a new colorimetric strategy was paved for screening ACP activity when coupled with L-ascorbic acid 2-phosphate trisodium salt (AAP) because ACP could catalyze hydrolysis of AAP to generate AA. The proposed colorimetric biosensor allows detection of ACP in the range 0.02–1.0 U/L with a limit of detection of 8.2 mU/L. Its potential utilization in ACP assay in human serum samples is successfully demonstrated.
研究领域:
材料科学
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纳米技术
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分析化学
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生物化学
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICA CHIMICA ACTA
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2022
·
IF 6.911
Xue Wang,Futing Wen,Liu He,Jiangyu Su,Ping Jiang,Daiping He
Defects engineering as an effective strategy was widely utilized to modulate catalytic performance for heterogeneous catalysts through tuning surface electronic surface and creating more active sites. In this work, porous Co–Mn oxide nanosheets with abundant oxygen vacancies (OVs-CMO NSs) were prepared via a simple “one-stone-two-birds” method. OVs were verified by various characterizations and found more favorable for O 2 absorption and activation to produce more reactive O2•- radical, resulting in an improved oxidase-like activity in initiating 3,3′,5,5′-tetramethylbenzidine (TMB) oxidation , with a lower K m value of 0.00717 mM and a higher V max of 2.086 × 10 −7 M/s. Since heparin (Hep) shows an inhibition effect on OVs-CMO NSs-TMB chromogenic system due to strong absorption, a colorimetric sensing platform for Hep detection was established. The present colorimetric detection shows high sensitivity, good selectivity and reliability for normal goat serum. This work not only provides a high-performance non-precious metal oxidase mimic prepared by simple surface defect engineering, but also builds a sensitive colorimetric method for Hep detection.
研究领域:
材料科学
·
纳米技术
·
分析化学
·
生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
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