Morphology-dependent formaldehyde detection of porous copper oxide hierarchical microspheres at near-room temperature

Zi, Baoye; Chen, Mingpeng; Qiu, Rong; Hu, Jicu; Wang, Huapeng; He, Jingcheng; Zhou, Shiqiang; Zhang, Dongming; Zhang, Jin; Liu, Qingju

doi:10.1016/j.micromeso.2020.110232

“…Both peaks of Cu 2p 1/2 and Cu 2p 3/2 respectively located at 952.6 eV and 932.8 eV in the high‐resolution spectrum (Figure 3 h, bottom) can be assigned to elemental copper. While as exhibited in the high‐resolution Cu 2p spectrum of CuONS/CF (Figure 3 h, top), the strong shake‐up peaks at 940.5 eV and 961.3 eV suggest the presence of Cu 2+ , which cannot be found in the spectrum of copper foam [18] . The main band of Cu 2p 3/2 can be further divided into two contributions at 933.7 eV assigned to Cu 2+ from CuO and 932.7 eV assigned to Cu 0 for inevitable minor flaws of materials from the process of synthesis (Figure S2).…”

Section: Resultsmentioning

confidence: 91%

Formic Acid Electro‐Synthesis by Concurrent Cathodic CO₂ Reduction and Anodic CH₃OH Oxidation

Wei

¹

,

Li

²

,

Chen

³

et al. 2020

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The electrochemical conversion of carbon dioxide into energy‐carrying compounds or value‐added chemicals is of great significance for diminishing the greenhouse effect and the efficient utilization of carbon‐dioxide emissions, but it suffers from the kinetically sluggish anodic oxygen evolution reaction (OER) and its less value‐added production of O2. We report a general strategy for efficient formic‐acid synthesis by a concurrent cathodic CO2 reduction and anodic partial methanol‐oxidation reaction (MOR) using mesoporous SnO2 grown on carbon cloth (mSnO2/CC) and CuO nanosheets grown on copper foam (CuONS/CF) as cathodic and anodic catalysts, respectively. Anodic CuONS/CF enables an extremely lowered potential of 1.47 V vs. RHE (100 mA cm−2), featuring a significantly enhanced electro‐activity in comparison to the OER. The cathodic mSnO2/CC shows a rather high Faraday efficiency of 81 % at 0.7 V vs. RHE for formic‐acid production from CO2. The established electrolyzer equipped with CuONS/CF at the anode and mSnO2/CC at the cathode requires a considerably low cell voltage of 0.93 V at 10 mA cm−2 for formic‐acid production at both sides.

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“…In addition, an all-around comparison between the sensing performance of the V O -rich ZnO sensor fabricated in this work and other recent reports about HCHO gas sensors 13 , 22 , 39 , 70 , 80 − 86 is summarized in Table 2 . The performance indexes showed by the V O -rich ZnO sensor were considered to be pre-eminent on the whole.…”

Section: Resultsmentioning

confidence: 95%

Visible Light-Induced Room-Temperature Formaldehyde Gas Sensor Based on Porous Three-Dimensional ZnO Nanorod Clusters with Rich Oxygen Vacancies

Zhang

¹

,

Wang

²

,

Wei

³

et al. 2022

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Oxygen vacancy (V O ) is a kind of primary point defect that extensively exists in semiconductor metal oxides (SMOs). Owing to some of its inherent qualities, an artificial manipulation of V O content in one material has evolved into a hot research field, which is deemed to be capable of modulating band structures and surface characteristics of SMOs. Specific to the gas-sensing area, V O engineering of sensing materials has become an effective means in enhancing sensor response and inducing light-enhanced sensing. In this work, a high-efficiency microwave hydrothermal treatment was utilized to prepare a V O -rich ZnO sample without additional reagents. The X-ray photoelectron spectroscopy test revealed a significant increase in V O proportion, which was from 9.21% in commercial ZnO to 36.27% in synthesized V O -rich ZnO possessing three-dimensional and air-permeable microstructures. The subsequent UV–vis–NIR absorption and photoluminescence spectroscopy indicated an extension absorption in the visible region and band gap reduction of V O -rich ZnO. It turned out that the V O -rich ZnO-based sensor exhibited a considerable response of 63% toward 1 ppm HCHO at room temperature (RT, 25 °C) under visible light irradiation. Particularly, the response/recovery time was only 32/20 s for 1 ppm HCHO and further shortened to 10/5 s for 10 ppm HCHO, which was an excellent performance and comparable to most sensors working at high temperatures. The results in this work strongly suggested the availability of V O engineering and also provided a meaningful candidate for researchers to develop high-performance RT sensors detecting volatile organic compounds.

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“…While as exhibited in the high-resolution Cu 2p spectrum of CuONS/CF (Figure 3h,top), the strong shake-up peaks at 940.5 eV and 961.3 eV suggest the presence of Cu 2+ , which cannot be found in the spectrum of copper foam. [18] The main band of Cu 2p 3/2 can be further divided into two contributions at 933.7 eV assigned to Cu 2+ from CuO and 932.7 eV assigned to Cu 0 for inevitable minor flaws of materials from the process of synthesis ( Figure S2). Besides, the O1 ss pectrum (Figure 3i)c an be deconvolved to two To investigate the electrocatalytic performance of asprepared CuONS/CF for the partial methanol oxidation to formic acid at the anode,aseries of electrochemical measurements have been carried out in at hree-electrode setup.…”

Section: Resultsmentioning

confidence: 99%

Formic Acid Electro‐Synthesis by Concurrent Cathodic CO₂ Reduction and Anodic CH₃OH Oxidation

Wei

¹

,

Li

²

,

Chen

³

et al. 2020

View full text Add to dashboard Cite

The electrochemical conversion of carbon dioxide into energy‐carrying compounds or value‐added chemicals is of great significance for diminishing the greenhouse effect and the efficient utilization of carbon‐dioxide emissions, but it suffers from the kinetically sluggish anodic oxygen evolution reaction (OER) and its less value‐added production of O2. We report a general strategy for efficient formic‐acid synthesis by a concurrent cathodic CO2 reduction and anodic partial methanol‐oxidation reaction (MOR) using mesoporous SnO2 grown on carbon cloth (mSnO2/CC) and CuO nanosheets grown on copper foam (CuONS/CF) as cathodic and anodic catalysts, respectively. Anodic CuONS/CF enables an extremely lowered potential of 1.47 V vs. RHE (100 mA cm−2), featuring a significantly enhanced electro‐activity in comparison to the OER. The cathodic mSnO2/CC shows a rather high Faraday efficiency of 81 % at 0.7 V vs. RHE for formic‐acid production from CO2. The established electrolyzer equipped with CuONS/CF at the anode and mSnO2/CC at the cathode requires a considerably low cell voltage of 0.93 V at 10 mA cm−2 for formic‐acid production at both sides.

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Morphology-dependent formaldehyde detection of porous copper oxide hierarchical microspheres at near-room temperature

Cited by 23 publications

References 36 publications

Formic Acid Electro‐Synthesis by Concurrent Cathodic CO₂ Reduction and Anodic CH₃OH Oxidation

Formic Acid Electro‐Synthesis by Concurrent Cathodic CO₂ Reduction and Anodic CH₃OH Oxidation

Visible Light-Induced Room-Temperature Formaldehyde Gas Sensor Based on Porous Three-Dimensional ZnO Nanorod Clusters with Rich Oxygen Vacancies

Formic Acid Electro‐Synthesis by Concurrent Cathodic CO₂ Reduction and Anodic CH₃OH Oxidation

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Morphology-dependent formaldehyde detection of porous copper oxide hierarchical microspheres at near-room temperature

Cited by 23 publications

References 36 publications

Formic Acid Electro‐Synthesis by Concurrent Cathodic CO2 Reduction and Anodic CH3OH Oxidation

Formic Acid Electro‐Synthesis by Concurrent Cathodic CO2 Reduction and Anodic CH3OH Oxidation

Visible Light-Induced Room-Temperature Formaldehyde Gas Sensor Based on Porous Three-Dimensional ZnO Nanorod Clusters with Rich Oxygen Vacancies

Formic Acid Electro‐Synthesis by Concurrent Cathodic CO2 Reduction and Anodic CH3OH Oxidation

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Formic Acid Electro‐Synthesis by Concurrent Cathodic CO₂ Reduction and Anodic CH₃OH Oxidation

Formic Acid Electro‐Synthesis by Concurrent Cathodic CO₂ Reduction and Anodic CH₃OH Oxidation

Formic Acid Electro‐Synthesis by Concurrent Cathodic CO₂ Reduction and Anodic CH₃OH Oxidation