Free‐standing and Flexible MoS 2 /rGO Paper Electrode for Amperometric Detection of Folic Acid

2019

ChemistrySelect

Self Cite

The flexible, free-standing and durable highly rough nickel metal-organic framework/reduced graphene oxide (NiMOF/ rGO) composite paper electrode was prepared with a simple electrochemical deposition of NiMOF structures on the surface of the rGO paper electrode. NiMOF/rGO composite paper electrode was characterized by using scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), Raman spectroscopy and electrochemical impedance spectroscopy (EIS) techniques. As-prepared NiMOF/ rGO composite paper was used in the electrochemical detection of catechol (CC). The rough and flower-like three-dimensional (3D) NiMOF nanostructures on the rGO paper electrode surface greatly increased the catalytic performance of the paper electrode by providing a large active surface area. CC was detected on NiMOF/rGO composite paper in a very wide linear range from 0.02 to 760 μM, a low detection limit of 1.8 nM (S/N = 3), with a high sensitivity of 0.158 mA μM cm À 2 and very high selectivity, especially in the presence of phenolderived materials. Furthermore, it was determined that NiMOF/ rGO composite paper also had high stability, flexibility, and durability, which may enable this material to be used in-vivo applications.[a] Dr. durability, which makes it possible to use this material in in vivo applications. The interference study performed with the rGO paper electrode was shown to prove that the NiMOF/rGO composite paper electrode was very selective for CC compared to rGO paper.

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of Highly Flexible, Free‐Standing, Three‐Dimensional and Rough NiMOF/rGO Composite Paper Electrode for Determination of Catechol

2019

ChemistrySelect

Self Cite

“…As a result, the S/N ratio will increase, hence, reducing both the detection limit and the limit of quantification of the electrode . Also, these flexible materials provide the convenience of utilization in many applications due to possessing shapeable, cuttable and rollable features . In this regard, combining MOFs and carbon‐based materials (such as graphene, carbon nanotubes and activated carbon) has drawn increasing attention because this combination exhibits highly mechanical, electronic, thermal and optical properties .…”

Section: Introductionmentioning

confidence: 99%

Graphene Paper with Sharp‐edged Nanorods of Fe−CuMOF as an Excellent Electrode for the Simultaneous Detection of Catechol and Resorcinol

Topç̧u

2019

Electroanalysis

Self Cite

A flexible composite paper Fe−Cu‐based metal‐organic framework (MOF)/reduced graphene oxide (rGO) (Fe−CuMOF/rGO) electrode was prepared by using a simple electrochemical method for the simultaneous detection of catechol (CC) and resorcinol (RC). Free‐standing, flexible and double‐sided Fe−CuMOF/rGO composite paper was obtained by applying the electrochemical deposition process on the rGO paper electrode in the solution containing Fe−CuMOF composite. The morphological analysis of Fe−CuMOF/rGO composite paper showed that sea urchin‐like structures formed on the rGO electrode surface consist of numerous sharp‐edged nanorods of Fe−CuMOF. Flexible Fe−CuMOF/rGO paper electrode exhibited high sensitivity, wide linear range and low detection limit for the simultaneous determination of CC and RC. The linear ranges of concentration for CC and RC were 0.1–800 and 0.1–720 μM, respectively, and the corresponding limits of detection (S/N=3) were 0.016 and 0.020 μM. The outstanding performance of this flexible electrode could be attributed to the sharp‐edged urchin‐like Fe−CuMOF structures which provide an increment of the surface area and the electrochemical activity of the composite paper electrode. Stability tests showed that Fe−CuMOF/rGO composite paper electrode has excellent flexibility, high durability, and good reproducibility. Furthermore, this electrode exhibited high sensitivity and selectivity for the determination of CC and RC in real sample analysis.

“…Also, these flexible materials provide the convenience of utilization in many applications due to possessing shapeable, cuttable and rollable features. In addition, graphene‐based papers show synergistic and collective properties when they are integrated with nanostructured materials while exhibiting the properties of graphene layers …”

Section: Introductionmentioning

confidence: 99%

“…In addition, graphene-based papers show synergistic and collective properties when they are integrated with nanostructured materials while exhibiting the properties of graphene layers. [20][21][22][23] Gold (Au)-coated surfaces have an increasing interest in applications such as fuel cells, electrochemical sensing, electrochemical energy storage and catalysis. 24,25 Gold nanoparticles (NPs) and Au thin films (TFs) are excellent candidates for HER electrocatalysts because they possess high catalytic activity.…”

Section: Introductionmentioning

confidence: 99%

Flexible gold nanoparticles/rGO and thin film/rGO papers: novel electrocatalysts for hydrogen evolution reaction

Topç̧u

J of Chemical Tech & Biotech

2019

Self Cite

BACKGROUND Fabrication of cost‐effective and durable materials for efficient hydrogen production in splitting water (hydrogen evolution reaction) is of importance for the successful utilization of hydrogen‐based green energy technologies. Therefore, electrocatalytic materials have been designed with a simple approach using electrodeposition of gold nanoparticles (AuNPs) and thin film (AuTF) directly on reduced graphene oxide (rGO) paper. As‐prepared paper electrocatalysts (AuNPs/rGO and AuTF/rGO) were characterized by X‐ray photoelectron spectroscopy (XPS), X‐ray diffraction (XRD), Raman spectroscopy and scanning electron microscopy (SEM). RESULTS Free‐standing and flexible AuNPs/rGO and AuTF/rGO electrocatalysts have exhibited excellent performances on HER with low Tafel slopes (88 and 112 mV dec−1), low onset potentials (−47 and −55 mV), small overpotentials of only −176 and −204 mV to drive 10 mA cm−2, respectively, and high durability even with the rolled design. The outstanding performance of these two electrocatalysts can be attributed to the uniform distribution of 20‐nm‐sized AuNPs and the deposition of well‐ordered AuTF on rGO paper, providing an increment in the surface area and an enhancement of the electron density. CONCLUSION The controllable design of AuNPs/rGO and AuTF/rGO electrocatalysts, together with their high flexibility, good stability and promising results, suggest potential use in future applications of H2 production in splitting water. © 2019 Society of Chemical Industry