Preparation of a Cu2O/rGO porous composite through a double-sacrificial-template method for non-enzymatic glucose detection

Xie, Haitao; Ke, Qirong; Xiong, Xiaopeng

doi:10.1007/s10853-017-0800-8

Cited by 18 publications

(3 citation statements)

References 29 publications

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“…Furthermore, the strong and sharp diffraction peaks in the patterns of all four Cu 2 O–RGO composites suggest outstanding crystallinities . These data confirm the successful syntheses of Cu 2 O–RGO composites, demonstrating the combined advantages of RGO (conductivity) and Cu 2 O (electrochemical performance), implying excellent photocatalytic activities of these samples …”

Section: Resultsmentioning

confidence: 99%

Reduced Graphene Oxide-Supported Copper(I) Oxide Composites for the Degradation of Methylene Blue: Exploring the Capacity of RGO as an Electron Capturer for Achieving Highly Stable Photocatalytic Activity

Vo,

Nguyen,

Bark

2024

ACS Appl. Electron. Mater.

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Reduced graphene oxide (RGO)-modified copper(I) oxide (Cu2O–RGO) is a high-performance composite and a low-cost photocatalyst for methylene blue (MB) degradation. To evaluate the effect of RGO on the photocatalytic performances of Cu2O–x% RGO composites (where x is the loading amount of RGO) in MB degradation, Cu2O was separately loaded with 10, 20, and 30 wt % RGO via a precipitation method. We synthesized a Cu2O–30% RGO composite with a superior surface area (S BET) of 43.701 m2/g, which provided a large active area for MB photodegradation. Cu2O–30% RGO composite was significantly more effective as a catalyst than bare Cu2O for MB photodegradation, as it degraded 99.2% MB in only 30 min under visible-light irradiation without oxidation agents as compared to the case of bare Cu2O (17.5% MB degradation). Notably, the Cu2O–30% RGO composite afforded the largest rate constant of 0.10193 L/min under visible-light irradiation, which was twice that of the Cu2O–30% RGO composite without irradiation (0.0561 L/min). Electron (e–) capture efficacy of RGO in suppressing electron (e–)–hole (h+) pairs recombination was demonstrated, and a plausible mechanism was proposed to rationalize the high photocatalytic efficiency of Cu2O–30% RGO. The RGO in Cu2O–RGO composites played crucial roles, narrowing the band gap, extending the lifetime, and substantially enhancing the photocatalytic activity of Cu2O. Durability and reusability of the catalysts were also examined, and MB degradation by the Cu2O–30% RGO composite was maintained at 95% in the second decolorization cycle followed by a decline to 87% in the fifth decolorization cycle, rendering the Cu2O–30% RGO composite appropriate for use in real-time environmental applications. This study provides an effective photocatalyst for the degradation of organic pollutants in wastewater and suggests its potential for future applications in related fields. Furthermore, herein, the role of RGO as an electron capturer in Cu2O–RGO composites for MB degradation under visible-light irradiation is comprehensively analyzed for the first time.

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Section: Resultsmentioning

confidence: 99%

Reduced Graphene Oxide-Supported Copper(I) Oxide Composites for the Degradation of Methylene Blue: Exploring the Capacity of RGO as an Electron Capturer for Achieving Highly Stable Photocatalytic Activity

Vo,

Nguyen,

Bark

2024

ACS Appl. Electron. Mater.

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“…The voltage range from −0.015 V to +0.250 V was selected to prevent redox events from occurring, so the crystals remained Cu 2 O for the size and facet effect comparison. 29 Previously, NiO x decoration on Cu 2 O photocathode can greatly enhance its stability and photocurrent density. 30 However, no photoelectrochemical reduction issue forming metallic Cu was found for Cu 2 O/CuO photoelectrode in the range of −0.01 V to 0.55 V. 31 At −0.005 V vs. RHE in the LSV curves, the photocurrents of S-cubes, M-cubes and L-cubes are 12.2 μA cm −2 , 10.2 μA cm −2 and 10.2 μA cm −2 , respectively, showing low sensitivity or connection to particle size.…”

Section: Resultsmentioning

confidence: 99%

Size- and facet-dependent photoelectrochemical properties of Cu₂O crystals

Huang

2023

J. Mater. Chem. C

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“…Among them, cuprous oxide (Cu 2 O), an important semiconductor with a band gap of 2.2 eV [ 18 ], has exhibited promising applications in the field of sensing, which is attributed to its minimal cost, stability, and significant catalytic activity [ 19 , 20 , 21 , 22 ]. Recently, in order to introduce larger surface areas and more catalytically active sites for the electrocatalytic reactions, porous Cu 2 O nanomaterials have been prepared and used to build biosensors with improved performances [ 23 , 24 , 25 , 26 ].…”

Section: Introductionmentioning

confidence: 99%

Preparation of Cuprous Oxide Mesoporous Spheres with Different Pore Sizes for Non-Enzymatic Glucose Detection

Wang

et al. 2018

Nanomaterials

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Mass transfer plays a significant role in a sensor’s performance, because the substrate can be detected only when it contacts with the active catalytic surface. In this work, cuprous oxide mesoporous nanospheres (Cu2O MPNS) with different pore size distributions are fabricated and applied as electrocatalysts for glucose detection. The small pore Cu2O (SP-Cu2O, mean pore size of 5.3 nm) and large pore Cu2O (LP-Cu2O, mean pore size of 16.4 nm) spheres are prepared by the template method and an etching treatment. The obtained two kinds of Cu2O MPNS exhibit high porosity with a similar specific surface area of 61.2 and 63.4 (m2·g−1), respectively. The prepared Cu2O MPNS are used to construct an electrochemical non-enzymatic glucose sensor. The results show that the LP-Cu2O exhibits better performance than SP-Cu2O, which illustrates that the internal diffusion takes a great impact on the performance of the sensor. The LP-Cu2O modified electrode possesses a high and reproducible sensitivity of 2116.9 μA mM−1·cm−2 at the applied potential of 0.6 V with a wide detection range of 0.003–7.8 mM and a low detection limit of 0.42 μM.

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Preparation of a Cu2O/rGO porous composite through a double-sacrificial-template method for non-enzymatic glucose detection

Cited by 18 publications

References 29 publications

Reduced Graphene Oxide-Supported Copper(I) Oxide Composites for the Degradation of Methylene Blue: Exploring the Capacity of RGO as an Electron Capturer for Achieving Highly Stable Photocatalytic Activity

Reduced Graphene Oxide-Supported Copper(I) Oxide Composites for the Degradation of Methylene Blue: Exploring the Capacity of RGO as an Electron Capturer for Achieving Highly Stable Photocatalytic Activity

Size- and facet-dependent photoelectrochemical properties of Cu₂O crystals

Preparation of Cuprous Oxide Mesoporous Spheres with Different Pore Sizes for Non-Enzymatic Glucose Detection

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Preparation of a Cu2O/rGO porous composite through a double-sacrificial-template method for non-enzymatic glucose detection

Cited by 18 publications

References 29 publications

Reduced Graphene Oxide-Supported Copper(I) Oxide Composites for the Degradation of Methylene Blue: Exploring the Capacity of RGO as an Electron Capturer for Achieving Highly Stable Photocatalytic Activity

Reduced Graphene Oxide-Supported Copper(I) Oxide Composites for the Degradation of Methylene Blue: Exploring the Capacity of RGO as an Electron Capturer for Achieving Highly Stable Photocatalytic Activity

Size- and facet-dependent photoelectrochemical properties of Cu2O crystals

Preparation of Cuprous Oxide Mesoporous Spheres with Different Pore Sizes for Non-Enzymatic Glucose Detection

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Size- and facet-dependent photoelectrochemical properties of Cu₂O crystals