Controllable dispersion of cobalt phthalocyanine molecules on graphene oxide for enhanced electrocatalytic reduction of CO<sub>2</sub> to CO

Huang, Weifeng; Li, Junqiang; Xu, Xiao; Cao, Aihui; He, Yiyong; Sun, Miao; Kang, Longtian

doi:10.1039/d1nj06182h

“…We next characterized the synthesized rGO/Co and rGO‐Co samples (Figure S27) by X‐ray photoelectron spectroscopy (XPS) and X‐ray absorption to investigate the effect of the calcination on the Co catalyst [36, 37] . CoTPP showed typical Co 2+ binding signals at 780.2 eV (Co 2p 3/2 ) and 795.7 eV (Co 2p 1/2 ) in XPS (Figure 5d).…”

Section: Resultsmentioning

confidence: 99%

“…We next characterized the synthesized rGO/Co and rGO-Co samples (Figure S27) by X-ray photoelectron spectroscopy (XPS) and X-ray absorption to investigate the effect of the calcination on the Co catalyst. [36,37] CoTPP Angewandte Chemie Forschungsartikel showed typical Co 2 + binding signals at 780.2 eV (Co 2p 3/2 ) and 795.7 eV (Co 2p 1/2 ) in XPS (Figure 5d). [38] Negative shifts of the Co 2p 3/2 and Co 2p 1/2 signals by À 0.6 and À 0.8 eV respectively were observed after the formation of the rGO/Co, suggesting that CoTPP has direct electronic interaction with the rGO substrate in the composite.…”

Section: Control Experiments Confirmed the Indispensable Roles Ofmentioning

confidence: 99%

Covalently Grafting Graphene onto Si Photocathode to Expedite Aqueous Photoelectrochemical CO₂ Reduction

Wei

¹

,

Su

²

,

Pan

³

et al. 2023

Angewandte Chemie

2

0

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Silicon semiconductor functionalized with molecular catalysts emerges as a promising cathode for photoelectrochemical (PEC) CO 2 reduction reaction (CO 2 RR). However, the limited kinetics and stabilities remains a major hurdle for the development of such composites. We herein report an assembling strategy of silicon photocathodes via chemically grafting a conductive graphene layer onto the surface of n + -p Si followed by catalyst immobilization. The covalently-linked graphene layer effectively enhances the photogenerated carriers transfer between the cathode and the reduction catalyst, and improves the operating stability of the electrode. Strikingly, we demonstrate that altering the stacking configuration of the immobilized cobalt tetraphenylporphyrin (CoTPP) catalyst through calcination can further enhance the electron transfer rate and the PEC performance. At the end, the graphene-coated Si cathode immobilized with CoTPP catalyst managed to sustain a stable 1-Sun photocurrent of À 1.65 mA cm À 2 over 16 h for CO production in water at a near neutral potential of À 0.1 V vs. reversible hydrogen electrode. This represents a remarkable improvement of PEC CO 2 RR performance in contrast to the reported photocathodes functionalized with molecular catalysts.

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“…We next characterized the synthesized rGO/Co and rGO-Co samples (Figure S27) by X-ray photoelectron spectroscopy (XPS) and X-ray absorption to investigate the effect of the calcination on the Co catalyst. [36,37] CoTPP Angewandte Chemie showed typical Co 2 + binding signals at 780.2 eV (Co 2p 3/2 ) and 795.7 eV (Co 2p 1/2 ) in XPS (Figure 5d). [38] Negative shifts of the Co 2p 3/2 and Co 2p 1/2 signals by À 0.6 and À 0.8 eV respectively were observed after the formation of the rGO/Co, suggesting that CoTPP has direct electronic interaction with the rGO substrate in the composite.…”

Section: Methodsmentioning

confidence: 99%

Covalently Grafting Graphene onto Si Photocathode to Expedite Aqueous Photoelectrochemical CO₂ Reduction

Wei

¹

,

Su

²

,

Pan

³

et al. 2023

View full text Add to dashboard Cite

Silicon semiconductor functionalized with molecular catalysts emerges as a promising cathode for photoelectrochemical (PEC) CO 2 reduction reaction (CO 2 RR). However, the limited kinetics and stabilities remains a major hurdle for the development of such composites. We herein report an assembling strategy of silicon photocathodes via chemically grafting a conductive graphene layer onto the surface of n + -p Si followed by catalyst immobilization. The covalently-linked graphene layer effectively enhances the photogenerated carriers transfer between the cathode and the reduction catalyst, and improves the operating stability of the electrode. Strikingly, we demonstrate that altering the stacking configuration of the immobilized cobalt tetraphenylporphyrin (CoTPP) catalyst through calcination can further enhance the electron transfer rate and the PEC performance. At the end, the graphene-coated Si cathode immobilized with CoTPP catalyst managed to sustain a stable 1-Sun photocurrent of À 1.65 mA cm À 2 over 16 h for CO production in water at a near neutral potential of À 0.1 V vs. reversible hydrogen electrode. This represents a remarkable improvement of PEC CO 2 RR performance in contrast to the reported photocathodes functionalized with molecular catalysts.

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“…Indicative of literature trends, the SEM micrograph of the CoPc-fur shows smooth clumped particles that emphasize the aggregation occurring between the planar π-conjugated molecules (see Figure 2). 59,60 Both the SEM micrographs of PANI and PANI-CoPc-fur displayed nanofibrous morphologies. The enhanced nanofibrous aggregation seen in the SEM micrograph of the PANI-CoPc-fur showed the interconnection between PANI network fibers, which could promote charge hopping and thereby improve the electrochemical properties of PANI composite fibers.…”

Section: ■ Introductionmentioning

confidence: 99%

Electrospun Nanofiber Composite Utilized as an Electrocatalyst for the Detection of Acetaminophen in Multifarious Water Samples

Shoba,

Mambanda,

Booysen

2024

ACS Omega

3

0

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Herein, the nanofabrication and characterization of new conductive materials, PANI-CoPc-fur (1) ((PANI = polyaniline and CoPc-fur = tetra-4-(furan-2-methylthiophthalocyaninato)-Co(II)) and PANI-CoPc-fur-f-MWCNTs (2) ( f-MWCNTs = carboxylic acid-functionalized multiwalled carbon nanotubes), are reported. Subsequently, an electrospun nanofiber (ENF) composite of 2, encapsulated with a poly(vinyl acetate) shell, was fabricated. The resultant core−shell nanoconjugated fibers, ENFs-2, were adsorbed on a glassy carbon electrode (GCE), followed by the immobilization of a permeable adhesion top layer of Nafion (Nf) to render the chemically modified electrode, GCE|ENFs-2-Nf. The electron-mediating properties of the components within the film of GCE|ENFs-2-Nf synergistically aided in promoting its electrocatalytic activities. Consequently, the CME showed greater cyclic voltammetry (CV) peak currents compared to the bare GCE and other modified electrodes, indicating its higher sensitivity toward acetaminophen (APAP), an emerging water pollutant of concern. The detection of APAP at the GCE|ENFs-2-Nf attained by square-wave voltammetry (SWV) was linear from 10 to 200 μM of APAP and was reproducible (%RSD of 3.2%, N = 3). The respective calculated limits of detection and quantification (LOD and LOQ) values of 0.094 and 0.28 μM were lower than those acquired using other electrochemical techniques. Analysis of APAP in the presence of commonly associated interferences metronidazole (MTZ) and dopamine (DA) illustrated a significant separation between the SWV peak potentials of APAP and MTZ, whereas there was some degree of overlap between the SWV current responses of APAP and DA. The analytical performance of the GCE|ENFs-2-Nf rendered a comparable percentage recovery (104%) with that of liquid chromatography−mass spectrometry (LC−MS) (106%).

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Controllable dispersion of cobalt phthalocyanine molecules on graphene oxide for enhanced electrocatalytic reduction of CO₂ to CO

Abstract: Electrocatalytic reduction of CO2 with non-precious materials containing Co-N-C moiety as catalyst is considered to be a promising method for carbon neutrality. Unfortunately, metal phthalocyanine with an intrinsic Co–pyrrolic N4–C...

Cited by 13 publications

References 46 publications

Covalently Grafting Graphene onto Si Photocathode to Expedite Aqueous Photoelectrochemical CO₂ Reduction

Covalently Grafting Graphene onto Si Photocathode to Expedite Aqueous Photoelectrochemical CO₂ Reduction

Covalently Grafting Graphene onto Si Photocathode to Expedite Aqueous Photoelectrochemical CO₂ Reduction

Electrospun Nanofiber Composite Utilized as an Electrocatalyst for the Detection of Acetaminophen in Multifarious Water Samples

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Controllable dispersion of cobalt phthalocyanine molecules on graphene oxide for enhanced electrocatalytic reduction of CO2 to CO

Abstract: Electrocatalytic reduction of CO2 with non-precious materials containing Co-N-C moiety as catalyst is considered to be a promising method for carbon neutrality. Unfortunately, metal phthalocyanine with an intrinsic Co–pyrrolic N4–C...

Cited by 13 publications

References 46 publications

Covalently Grafting Graphene onto Si Photocathode to Expedite Aqueous Photoelectrochemical CO2 Reduction

Covalently Grafting Graphene onto Si Photocathode to Expedite Aqueous Photoelectrochemical CO2 Reduction

Covalently Grafting Graphene onto Si Photocathode to Expedite Aqueous Photoelectrochemical CO2 Reduction

Electrospun Nanofiber Composite Utilized as an Electrocatalyst for the Detection of Acetaminophen in Multifarious Water Samples

Contact Info

Product

Resources

About

Controllable dispersion of cobalt phthalocyanine molecules on graphene oxide for enhanced electrocatalytic reduction of CO₂ to CO

Covalently Grafting Graphene onto Si Photocathode to Expedite Aqueous Photoelectrochemical CO₂ Reduction

Covalently Grafting Graphene onto Si Photocathode to Expedite Aqueous Photoelectrochemical CO₂ Reduction

Covalently Grafting Graphene onto Si Photocathode to Expedite Aqueous Photoelectrochemical CO₂ Reduction