Fabrication of hierarchical CuO architectures displaying the (111) facets‐enhanced superior fenton‐like degradation of organic dyes

Hu, Hanmei; Yu, Hong; Ding, Kangze; Jiang, Zanzan; Liao, Yaping; Ge, Xinqing; Sun, Min; Deng, Chonghai

doi:10.1007/s10854-021-05829-2

Cited by 8 publications

(7 citation statements)

References 43 publications

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“…Figure 1g,h showcases HR-TEM images of CuO and Mn 2 O 3 nanoparticles, displaying interplanar spacings of 0.234 and 0.265 nm, corresponding to the (111) and (222) crystallographic facets, respectively. 33,34 Furthermore, Figure 1i highlights an interplanar spacing of 0.290 nm, aligning well with the (200) crystal plane of CuMn 2 O 4 . 35 These observations serve as the foundation for selecting the corresponding exposed crystal planes in our DFT calculation models.…”

Section: ■ Introductionsupporting

confidence: 62%

Construction of Surface Synergetic Oxygen Vacancies on CuMn₂O₄ Spinel for Enhancing NO Reduction with CO

Xu,

Liu,

et al. 2024

ACS Catal.

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The effectiveness of surface synergetic oxygen vacancy (SSOV) on a catalyst has been proposed in the selective reduction of NO to N2 by CO. In this work, we prepared fresh CuMn2O4 spinel catalyst using the freeze-assisted sol–gel method, and then engineered SSOVs through CO pretreatment (CO–CuMn2O4) at 250 °C. The catalytic performance of the CO–CuMn2O4 catalyst showed significant improvement, attributed to the presence of SSOVs, in comparison to that of the fresh CuMn2O4 sample. Additionally, our findings elucidated the limited reactivity of surface oxygen vacancies (SOVs) on a single metal oxide, emphasizing the crucial role played by SSOVs. Experimental results, including NO temperature-programmed desorption-mass spectrometry and in situ diffuse reflectance infrared Fourier transform spectroscopy, provided further insights by suggesting that SSOVs facilitate the formation of N2O and its subsequent decomposition into N2. Density functional theory calculations have unveiled the pivotal role of SSOV in stabilizing the nitrogen atom derived from gaseous NO, facilitating the NO + CO → N* + CO2 reaction. Notably, the energy barrier for this process is only 0.54 eV, which is the rate-determining step of the NO + CO reaction. In stark contrast, this reaction scarcely occurs on the SOVs of single CuO and Mn2O3 surfaces. Furthermore, the presence of SSOVs considerably lowers the energy barrier for the conversion of N2O to N2, with a minimal barrier of 0.12 eV. In contrast, the reduction of N2O by CO without SSOV assistance necessitates a significantly higher energy barrier of 2.77 eV. Extending our investigation, we engineered SSOVs on the CuFe2O4 spinel catalyst and observed similar SSOV-mediated effects in the NO + CO reaction. Our research offers a comprehensive understanding of atomic-level role of SSOV, thereby offering valuable insights for the design of efficient NO + CO catalysts.

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Section: ■ Introductionsupporting

confidence: 62%

Construction of Surface Synergetic Oxygen Vacancies on CuMn₂O₄ Spinel for Enhancing NO Reduction with CO

Xu,

Liu,

et al. 2024

ACS Catal.

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“…The XRD patterns of capsule-like CuO, as shown in Figure a, have well-matched lattice planes (JCPDS No. 05-0661) and confirm the monoclinic structure phases . The indexed powder XRD patterns with diffraction 2θ values of 32.5, 35.5, 38.7, 48.7, 58.3, 63.5, 66.3, and 68.0° corresponded to the crystal planes of CuO (1 1 0), (0 0 2), (1 1 1), (−2 0 0), (2 0 2), (−1 1 3), (0 2 2), and (3 1 0), respectively.…”

Section: Resultsmentioning

confidence: 61%

“…05-0661) and confirm the monoclinic structure phases. 22 The indexed powder XRD patterns with diffraction 2θ values of 32.5, 35.5, 38.7, 48.7, 58.3, 63.5, 66.3, and 68.0°corresponded to the crystal planes of CuO (1 1 0), (0 0 2), (1 1 1), (−2 0 0), (2 0 2), (−1 1 3), (0 2 2), and (3 1 0), respectively. The CuO@CD composite exhibited similar diffraction peaks of CuO with the addition of 26°, corresponding to the plane of CuO (0 0 2) to confirm the presence of graphitic CDs, for the CuO@CD nanocomposite.…”

Section: Resultsmentioning

confidence: 99%

Enhanced Electrochemical Performance of CuO Capsules@CDs Composites for Solid-State Hybrid Supercapacitor

et al. 2023

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Capsule-like CuO/CDs (CuO@CDs) with a surface area of 33.12 m2 g–1 were synthesized by the hydrothermal treatment, compared to 19.02 m2 g–1 for pristine CuO. An anode was then fabricated from capsule-like CuO@CDs to form a hybrid solid-state supercapacitor (HSSC) with the activated carbon (AC) cathode and PVA/1M KOH as an electrolyte. Three electrode system offered 1208.88 F/g (specific capacitance at 2 A/g current density) and unveiled a remarkable life cycle (retention) and Coulombic efficiency (CF): 93 and 98% after 5000 charge–discharge cycles at 10 A/g. In terms of performance, the HSSC delivered 1.5 V and 102.60 F/g (50.74 C/g) at 2 A/g, 8437.50 W/kg (power density), and 36.90 Wh/kg (energy density). The HSSC still retained 92% of cyclic stability and 83% of CF after 10,000 cycles.

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“…7 exhibits the dominance of (111) and (À111) diffraction peaks of CuO nanowires, indicating the largest exposure of ( 111) and (À111) crystal facets. 38 According to the previous study, the surface energies of (111) and (À111) crystallographic planes of CuO are the lowest under ambient conditions, which can result in the preferential nucleation on these specic facets. 39 In other words, the growth rate may be accelerated along ( 111) and (À111) directions due to lower surface energies, resulting in the anisotropic growth on these facets to form nanowires.…”

Section: The Growth and Transformation Mechanismmentioning

confidence: 89%

Facile and scaleable transformation of Cu nanoparticles into high aspect ratio Cu oxide nanowires in methanol

et al. 2022

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Fabrication of hierarchical CuO architectures displaying the (111) facets‐enhanced superior fenton‐like degradation of organic dyes

Cited by 8 publications

References 43 publications

Construction of Surface Synergetic Oxygen Vacancies on CuMn₂O₄ Spinel for Enhancing NO Reduction with CO

Construction of Surface Synergetic Oxygen Vacancies on CuMn₂O₄ Spinel for Enhancing NO Reduction with CO

Enhanced Electrochemical Performance of CuO Capsules@CDs Composites for Solid-State Hybrid Supercapacitor

Facile and scaleable transformation of Cu nanoparticles into high aspect ratio Cu oxide nanowires in methanol

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Fabrication of hierarchical CuO architectures displaying the (111) facets‐enhanced superior fenton‐like degradation of organic dyes

Cited by 8 publications

References 43 publications

Construction of Surface Synergetic Oxygen Vacancies on CuMn2O4 Spinel for Enhancing NO Reduction with CO

Construction of Surface Synergetic Oxygen Vacancies on CuMn2O4 Spinel for Enhancing NO Reduction with CO

Enhanced Electrochemical Performance of CuO Capsules@CDs Composites for Solid-State Hybrid Supercapacitor

Facile and scaleable transformation of Cu nanoparticles into high aspect ratio Cu oxide nanowires in methanol

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Construction of Surface Synergetic Oxygen Vacancies on CuMn₂O₄ Spinel for Enhancing NO Reduction with CO

Construction of Surface Synergetic Oxygen Vacancies on CuMn₂O₄ Spinel for Enhancing NO Reduction with CO