Atomic molar ratio optimization of carbon nanotube supported PdAuCo catalysts for ethylene glycol and methanol electrooxidation in alkaline media

Ulaş, Berdan; Çağlar, Aykut; Kıvrak, Arif; Kıvrak, Hilal

doi:10.1007/s11696-018-0601-9

Cited by 43 publications

(22 citation statements)

References 62 publications

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“…EIS experiments were conducted at −0.4 V. It is known that charge transfer resistance ( R ct ) could be interpreted based on semicircle diameter of the curves . In other words, catalysts showing curves with smaller semicircular diameters have smaller R ct and higher electrocatalytic activities . Accordingly, it is clear from Figure that the Pd 90 Ni 10 /CNT catalyst has the lowest R ct and the highest electrocatalytic activity among the other catalysts.…”

Section: Resultsmentioning

confidence: 99%

“…ICP-MS analysis was conducted to check the Pd:Ni ratio of PdNi/CNT catalysts, and Figure 4 represents the related results. It was seen that synthesis of the catalysts at targeted atomic metal compositions was accomplished since the molar Pd:Ni ratios of Pd 90 Ni 10 /CNT, Pd 70 Figure 5 represents the voltammograms of PdNi/CNTs. oxides, display positive shift by the addition of Ni.…”

Section: Characterizationmentioning

confidence: 99%

“…67,68 In other words, catalysts showing curves with smaller semicircular diameters have smaller R ct and higher electrocatalytic activities. [69][70][71] Accordingly, it is clear from Figure 8 that the Pd 90 Ni 10 /CNT catalyst has the lowest R ct and the highest electrocatalytic activity among the other catalysts. Besides, R ct of all bimetallic PdNi/CNTs was lower than that of Pd/CNT.…”

Section: Characterizationmentioning

confidence: 99%

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Determination of optimum Pd:Ni ratio for Pd _x Ni _{100‐
x} / CNT s formic acid electrooxidation catalysts synthesized via sodium borohydride reduction method

2019

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Summary The main purpose of this study is to investigate the optimum Pd:Ni molar ratio for carbon nanotube–supported PdNi (PdxNi100‐x/CNT) alloy catalysts toward formic acid electrooxidation (FAE). NaBH4 reduction method was employed for the synthesis of Pd90Ni10/CNT, Pd70Ni30/CNT, Pd50Ni50/CNT, and Pd40Ni60/CNT. Synthesized catalysts were characterized by employing advanced surface analytical techniques, namely, X‐ray diffraction (XRD), transmission electron microscopy (TEM), N2 adsorption‐desorption, and inductively coupled plasma–mass spectrometry (ICP‐MS). The characterization results showed that all catalysts were successfully synthesized at desired molar composition. Pd90Ni10/CNT displayed the highest specific and mass activities with 2.32 mA/cm2 and 613.9 mA/mg Pd, respectively. Specific activity of the Pd90Ni10/CNT was found approximately 3.6, 2.3, 11.1, and 3.4 times higher than those of Pd70Ni30/CNT, Pd50Ni50/CNT, Pd40Ni60/CNT, and Pd/CNT, respectively. The synergistic effect between Pd and Ni at optimized metal ratio was utilized to obtain an improvement in specific activity. Furthermore, Pd90Ni10/CNT showed the lowest charge transfer resistance (Rct) and a long‐term stability. To our knowledge, this is the first study reporting the optimization of atomic molar composition for PdxNi100‐x/CNT catalysts toward FAE.

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Section: Resultsmentioning

confidence: 99%

Section: Characterizationmentioning

confidence: 99%

Section: Characterizationmentioning

confidence: 99%

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Determination of optimum Pd:Ni ratio for Pd _x Ni _{100‐
x} / CNT s formic acid electrooxidation catalysts synthesized via sodium borohydride reduction method

2019

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“…However, fossil fuels will be exhausted in future and these fossil fuel exhausts lead to environmental hazards 3 Thus, fuel cells have gained great importance in recent years due to increasing energy need-related population and growing industry. [5][6][7][8][9][10][11][12][13][14] Direct glucose fuel cell (DGFC) is also an energy device converting chemical energy into electrical energy. [5][6][7][8][9][10][11][12][13][14] Direct glucose fuel cell (DGFC) is also an energy device converting chemical energy into electrical energy.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of in situ N‐, S‐, and B‐doped few‐layer graphene by chemical vapor deposition technique and their superior glucose electrooxidation activity

2019

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Summary At present, N‐, S‐, and B‐doped grapheme‐modified indium tin oxide (ITO) electrodes are produced and doping method effect on the glucose electrooxidation is investigated. Firstly, few‐layer graphene is produced by chemical vapor deposition (CVD) method. Then, N, S, and B doping is carried out after graphene produced by CVD to prepare N‐doped, B‐doped, and S‐doped few‐layer graphene. N, S, and B doping is carried out by two different ways as (a) doping after synthesis of few‐layer graphene and (b) in situ doping during few‐layer graphene production. These materials are characterized by X‐ray diffraction, scanning electron microscopy‐energy (SEM), Raman spectroscopy, and X‐ray photoelectron spectroscopy (XPS). One could note that graphene and nitrogen networks are clearly visible from SEM images. Raman spectra show that B, N, and S are doped on few‐layer graphene/ITO successfully. XPS results of graphene, N‐doped graphene, and in situ N‐doped graphene reveal that graphene and nitrogen atoms used in the preparation of the electrodes obtain mainly in their elemental state. Then, these N‐, S‐, B‐doped and in situ N‐, S‐, B‐doped few‐layer graphene materials are coated onto indium tin oxide (ITO) to obtain N‐, S‐, B‐doped and in situ N‐, S‐, B‐doped ITO electrodes for glucose (C6H12O6) electrooxidation. C6H12O6 electrooxidation measurements are investigated with cyclic voltammetry, chronoamperometry, and electrochemical impedance spectroscopy measurements. As a result, in situ N‐doped few‐layer graphene/ITO electrode displays the best C6H12O6 electrooxidation activity with 9.12 mA.cm−2 current density compared with other N‐, S‐, B‐doped graphene and in situ doped S and B grapheme‐modified ITO electrodes. Furthermore, this current density value for in situ N‐doped few‐layer graphene/ITO is highly above the values reported in the literature. In situ N‐doped few‐layer graphene/ITO electrode is a promising electrode for C6H12O6 electrooxidation because it exhibits the best electrocatalytic activity, stability, and resistance compared with other electrodes.

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“…However, the energy need is currently increasing due to the growth in world population and industry. Therefore, alternative energy sources are investigated to meet the energy needs . Recently, research studies have been concentrated on fuel cells as alternative energy devices.…”

Section: Introductionmentioning

confidence: 99%

Few‐layer graphene coated on indium tin oxide electrodes prepared by chemical vapor deposition and their enhanced glucose electrooxidation activity

2019

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At present, few‐layer graphene is deposited on copper (Cu) foil by chemical vapor deposition (CVD) method. Then, the few‐layer graphenes produced on the Cu foil are coated onto the indium tin oxide (ITO) electrode to investigate their glucose electrooxidation activities. Hexane and hydrogen flow rate and deposition time parameters with CVD method are examined on different Cu foils. These electrodes are characterized by scanning electron microscopy‐energy dispersive X‐ray analysis (SEM‐EDX), X‐ray photoelectron spectroscopy (XPS), and Raman spectroscopy. Furthermore, glucose electrooxidation is examined with cyclic voltammetry (CV), chronoamperometry (CA), and electrochemical impedance spectroscopy (EIS) measurements. One could note that the graphene network is clearly visible from SEM images. The deconvoluted XPS spectrum indicates that carbon appeared in the form of non‐oxygenated ring C atoms for few‐layer graphene. The few‐layer graphene structure is confirmed by Raman analysis. Few‐layer graphene/ITO produced at 5 sccm Hexane and 50 sccm hydrogen flow rate and 20 minutes deposition time (G7/ITO) reveals the best electrode activity. The specific activity of G7/ITO electrode is obtained as 6.58 mA cm−2. According to CV, CA, and EIS results, G7/ITO electrode has high electrocatalytic activity, stability, and resistance in comparison with other electrodes.

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Atomic molar ratio optimization of carbon nanotube supported PdAuCo catalysts for ethylene glycol and methanol electrooxidation in alkaline media

Cited by 43 publications

References 62 publications

Determination of optimum Pd:Ni ratio for Pd _x Ni _{100‐
x} / CNT s formic acid electrooxidation catalysts synthesized via sodium borohydride reduction method

Determination of optimum Pd:Ni ratio for Pd _x Ni _{100‐
x} / CNT s formic acid electrooxidation catalysts synthesized via sodium borohydride reduction method

Synthesis of in situ N‐, S‐, and B‐doped few‐layer graphene by chemical vapor deposition technique and their superior glucose electrooxidation activity

Few‐layer graphene coated on indium tin oxide electrodes prepared by chemical vapor deposition and their enhanced glucose electrooxidation activity

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Atomic molar ratio optimization of carbon nanotube supported PdAuCo catalysts for ethylene glycol and methanol electrooxidation in alkaline media

Cited by 43 publications

References 62 publications

Determination of optimum Pd:Ni ratio for Pd x Ni 100‐ x / CNT s formic acid electrooxidation catalysts synthesized via sodium borohydride reduction method

Determination of optimum Pd:Ni ratio for Pd x Ni 100‐ x / CNT s formic acid electrooxidation catalysts synthesized via sodium borohydride reduction method

Synthesis of in situ N‐, S‐, and B‐doped few‐layer graphene by chemical vapor deposition technique and their superior glucose electrooxidation activity

Few‐layer graphene coated on indium tin oxide electrodes prepared by chemical vapor deposition and their enhanced glucose electrooxidation activity

Contact Info

Product

Resources

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Determination of optimum Pd:Ni ratio for Pd _x Ni _{100‐
x} / CNT s formic acid electrooxidation catalysts synthesized via sodium borohydride reduction method

Determination of optimum Pd:Ni ratio for Pd _x Ni _{100‐
x} / CNT s formic acid electrooxidation catalysts synthesized via sodium borohydride reduction method