Novel palladium-guanine-reduced graphene oxide nanocomposite as efficient electrocatalyst for methanol oxidation reaction

Ng, Jen Chao; Tan, Chou Yong; Ong, Boon Hoong; Matsuda, Atsunori; Basirun, Wan Jefrey; Tan, Wei; Singh, Ramesh; Yap, Boon Kar

doi:10.1016/j.materresbull.2018.12.029

Cited by 15 publications

(4 citation statements)

References 37 publications

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“…3a, Raman spectra of GO and PtNi/PANI@rGO show the G peaks at 1593 cm −1 from in-plane vibration of the sp 2 carbon atoms in graphene and simultaneously the D peaks observed at 1331 cm −1 are generally attributed to the disordered vibration of graphene existing the structural defects or edges. 47 The intensity ratio (I d /I g ) of the D and G peaks for PtNi/ PANI@rGO is about 1.38, and is higher than I d /I g of 1.16 for GO, remarking the decrease in crystal structure and the increase in sp 2 domain disorder. [48][49][50][51] In Fig.…”

Section: Resultsmentioning

confidence: 90%

Pt/Ni Catalyst Supported by Composite of Graphene and Polyaniline Microtubes Boosting Methanol Electrochemical Oxidation

Jin

et al. 2021

J. Electrochem. Soc.

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The development of durable and efficient anode electrocatalysts is crucial for direct methanol fuel cells. In this paper, polyaniline (PANI) microtubes are firstly prepared by removing the polystylene (PS) core from PANI coated electrospun PS. The catalyst of PtNi/PANI@rGO is built by two steps: graphene oxide (GO) is mixed with PANI microtubes to obtain PANI@GO and then PANI@GO is used as a support material to load PtNi nanoparticles by reductive reaction while GO is reduced into rGO. The morphology, electronic structure and chemical structure of the catalysts are characterized by SEM, TEM, XPS and Raman spectroscopy, respectively. The electrochemical analysis of electrochemical impedance spectroscopy, cyclic voltammetry and chronoamperometric measurement are performed to analyze the electrocatalytic performance. The electrochemical results indicate that as-synthesized PtNi/PANI@rGO has the high activity toward methanol oxidation, and its mass activity is 1.7, 1.3 and 4.1 times higher than that of PtNi/PANI, PtNi/rGO and commercial Pt/C catalysts, respectively. The PANI microtubes not only improve the electron transfer kinetic but also help avoid the accumulation of graphene layers. The doping of Ni into Pt changes the surface electronic structure to elevate the catalytic activity and helps effectively improve the resistance to CO poisoning.

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Section: Resultsmentioning

confidence: 90%

Pt/Ni Catalyst Supported by Composite of Graphene and Polyaniline Microtubes Boosting Methanol Electrochemical Oxidation

Jin

et al. 2021

J. Electrochem. Soc.

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“…PANI showed negligible peak current during the CV measurements in PBS alone, as also reported in the literature ( Figure 4A ) ( 45 , 46 ). However, rGO-PANI showed a reduction peak at the potential of approximately -0.1 V with a current response of 0.62 mA, attributed to the electrocatalytic effects of rGO ( 47 – 49 ). The reduction potential slightly shifted in the range 0.5 – 0.6 V in Ni-rGO-PANI.…”

Section: Resultsmentioning

confidence: 99%

Development of ESAT-6 Based Immunosensor for the Detection of Mycobacterium tuberculosis

2021

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Early secreted antigenic target of 6 kDa (ESAT-6) has recently been identified as a biomarker for the rapid diagnosis of tuberculosis. We propose a stable and reusable immunosensor for the early diagnosis of tuberculosis based on the detection and quantification of ESAT-6 via cyclic voltammetry (CV). The immunosensor was synthesized by polymerizing aniline dispersed with the reduced graphene oxide (rGO) and Ni nanoparticles, followed by surface modification of the electroconductive polyaniline (PANI) film with anti-ESAT-6 antibody. Physicochemical characterization of the prepared materials was performed by several analytical techniques, including FE-SEM, EDX, XRD, FT-IR, Raman, TGA, TPR, and BET surface area analysis. The antibody-modified Ni-rGO-PANI electrode exhibited an approximately linear response (R2 = 0.988) towards ESAT-6 during CV measurements over the potential range of -1 to +1 V. The lower detection limit for ESAT-6 was approximately 1.0 ng mL-1. The novelty of this study includes the development of the reusable Ni-rGO-PANI-based electrochemical immunosensor for the early diagnosis of tuberculosis. Furthermore, this study successfully demonstrates that electro-conductive PANI may be used as a polymeric substrate for Ni nanoparticles and rGO.

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“…The peaks at 3896.65 cm -1 , 3763.58 cm -1 and 3443.92 cm -1 are ascribed to the stretching vibration of the hydroxyl group. 31,32 The peak at 2883.19 cm -1 confirms the existence of out-of-phase stretching vibration of -CH2-alkane, while the peak at 1809.47 cm -1 is attributed to the C-C stretching of a benzene ring. 26,33 The peaks related to the C=C aromatic ring and O-H bending vibration of phenols appeared at 1609.86 cm -1 and 1423.27 cm -1 , respectively.…”

Section: 𝐷 =mentioning

confidence: 87%

The electrochemical reduction of hydrogen peroxide on a palladium-amorphous carbon composite in an alkaline medium

Čović,

Mirčeski,

Zarubica

et al. 2023

Maced. J. Chem. Chem. Eng.

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The study of hydrogen peroxide reduction in an alkaline aqueous medium on a composite of palladium particles dispersed in an amorphous carbon matrix (Pd@AC) was performed. Scanning Electron Microscopy (SEM), Energy-dispersive X-ray spectroscopy (EDX), Fourier-transform infrared spectroscopy (FTIR), and X-ray Powder Diffraction (XRD) were used to examine morphology, composition, and crystalline structure. The crystalline structure and size of palladium were analyzed using XRD. The reduction of hydrogen peroxide was studied through cyclic and square-wave voltammetry in an alkaline solution in the absence and presence of dissolved oxygen. The overall electrocatalytic effect of Pd@AC toward hydrogen peroxide reduction strongly depends on the presence of oxygen and the hydrogen peroxide disproportionation reaction in the three-phase system of amorphous carbon, palladium particles, and electrolyte solution.

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Novel palladium-guanine-reduced graphene oxide nanocomposite as efficient electrocatalyst for methanol oxidation reaction

Cited by 15 publications

References 37 publications

Pt/Ni Catalyst Supported by Composite of Graphene and Polyaniline Microtubes Boosting Methanol Electrochemical Oxidation

Pt/Ni Catalyst Supported by Composite of Graphene and Polyaniline Microtubes Boosting Methanol Electrochemical Oxidation

Development of ESAT-6 Based Immunosensor for the Detection of Mycobacterium tuberculosis

The electrochemical reduction of hydrogen peroxide on a palladium-amorphous carbon composite in an alkaline medium

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