Hydrogen Generation via Sodium Borohydride Hydrolysis Using the Graphene Supported Platinum-Ruthenium-Cobalt Catalysts Prepared nu Microwave-Assisted Synthesis

Semasko, Miroslav; Tamašauskaitė–Tamašiūnaitė, Loreta; Stalnioniene, Irena; Žielienė, A.; Vaičiūnienė, Jūratė; Šimkūnaitė-Stanynienė, Birutė; Selskis, Algirdas; Norkus, Eugenijus

doi:10.1149/06803.0037ecst

Cited by 2 publications

(2 citation statements)

References 22 publications

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“…30 Ru metal could be modified with these nonnoble metals to increase activity due to synergetic effect and reduce the cost of the nanocatalysts by increasing the nonnoble metal ratio. [32][33][34][35] The role of the second metal and the support material is to increase the overall performance of the nanocatalyst or improve the distribution of the gas-solid reaction by preventing metal oxidation, coke release, and metal sintering. The hydrogen production performance of various ruthenium-based catalysts in the literature is given in Table 1.…”

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confidence: 99%

Untangling the cobalt promotion role for ruthenium in sodium borohydride dehydrogenation with multiwalled carbon nanotube‐supported binary ruthenium cobalt catalyst

Hansu

Şahi̇n

Çağlar

et al. 2020

Intl J of Energy Research

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In the present study, multiwalled carbon nanotube-supported Ru (Ru/MWCNT) and RuCo (RuCo/MWCNT) nanocatalysts with 3 wt% Ru loading were synthesized via sodium borohydride (SBH) reduction method for the dehydrogenation of SBH (R SBH). These nanocatalysts were characterized with XRD, XPS, SEM-EDX, and TEM. Ru/MWCNT and Ru:Co/MWCNT catalysts with varying Ru:Co atomic ratios were prepared successfully, and electronic state of Ru:Co altered compared to Ru. R SBH activities of these Ru/MWCNT and RuCo/MWCNT were examined in alkaline environment. RuCo/MWCNT at 80:20 atomic ratio exhibits superior H 2 evolution. Further experiments were performed with RuCo/MWCNT at 80:20 atomic ratio to determine how NaOH concentration (C NaOH), reaction temperature (T rxn), SBH concentration (C SBH), and amount of nanocatalyst (M c) affect R SBH activities. Activation energy (Ea) was calculated using the Arrhenius equation. RuCo/MWCNT at 80:20 atomic ratio exhibits superior H 2 evolution activities compared to the literature values. Initial rate (IR) for this nanocatalyst was found as 123.9385 mL H 2 g −1 cat min −1. As a result of these kinetic calculations, the Ea of the nanocatalysts was calculated as 35.978 kJ/mol. The degree of reaction (n) was found to be 0.53 by trial and error. RuCo/MWCNT at 80:20 atomic ratio is a promising nanocatalyst for R SBH .

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confidence: 99%

Untangling the cobalt promotion role for ruthenium in sodium borohydride dehydrogenation with multiwalled carbon nanotube‐supported binary ruthenium cobalt catalyst

Hansu

Şahi̇n

Çağlar

et al. 2020

Intl J of Energy Research

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“…For catalysis of NaBH 4 , the use of finely divided metal catalysts are often emphasized elsewhere, particularly the use of Pd [29][30][31][32], Pt [33][34][35][36] and Ru [37][38][39][40][41]. However, despite their excellent catalytic efficiencies, the use of those metal catalysts is highly cost prohibitive, which makes their usage for fuel-cells applications highly uneconomical.…”

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confidence: 99%

Synthesis of Fe-Fe2B catalysts via solvothermal route for hydrogen generation by hydrolysis of NaBH4

Baris¹,

Şimşek²,

Taşkaya³

et al. 2018

Journal of Boron

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In this study, iron sulfate (FeSO 4) and sodium borohydride (NaBH 4) were used to synthesize Fe-Fe 2 B nanocrystals via the solvothermal route. Synthesis of Fe-Fe 2 B nanocrystals was carried out under Argon (Ar) gas atmosphere with aqueous solutions of FeSO 4 .7H 2 O and NaBH 4 at various concentrations and reaction time. The phases and microstructures of nanocrystals thus formed were characterized by X-Ray diffraction (XRD) spectroscopy and scanning electron microscopy (SEM). Surface areas of nanocrystals were measured by a surface area and pore-size analyzer using nitrogen adsorption-desorption method together with Brunauer-Emmett-Teller (BET) equation. The vacuum dried nanoparticles were calcined under both Ar and air at 500 ºC. Nano-cylindrical structures of Fe-Fe 2 B were observed when calcinated under Ar atmosphere; whereas more irregular shaped particles were noticed when calcinated under air. The surface areas of Fe-Fe 2 B were determined as 12 m 2 /g, 5.5 m 2 /g and 16.5 m 2 /g, for vacuum dried, Ar-calcined and O 2-calcined products respectively. The catalytic effect of those nano-particles to generate hydrogen was studied by determining reaction rate of decomposition of NaBH 4 in aqueous alkaline solution. The catalytic activity was investigated by systematic variation of three parameters (1) the amount of Fe-Fe 2 B, (2) the concentration of NaBH 4 and (3) the concentration of NaOH. The effect of temperature on the catalytic activity was also studied separately for the most effective composition by varying the temperature from 25 to 70 °C. It was noticed that the catalytic activity of vacuum dried nanocrystals was the highest. The catalytic activity was found to increase with the increase in NaBH 4 concentration and decrease with the increase in NaOH concentration. The influence of temperature studied with 0.01 g of Fe-Fe 2 B in 1 % w/w NaBH 4 solution showed that the rate of hydrogen generation could be increased almost 5 times more by varying the temperature from 25 °C to 70 °C.

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Hydrogen Generation via Sodium Borohydride Hydrolysis Using the Graphene Supported Platinum-Ruthenium-Cobalt Catalysts Prepared nu Microwave-Assisted Synthesis

Cited by 2 publications

References 22 publications

Untangling the cobalt promotion role for ruthenium in sodium borohydride dehydrogenation with multiwalled carbon nanotube‐supported binary ruthenium cobalt catalyst

Untangling the cobalt promotion role for ruthenium in sodium borohydride dehydrogenation with multiwalled carbon nanotube‐supported binary ruthenium cobalt catalyst

Synthesis of Fe-Fe2B catalysts via solvothermal route for hydrogen generation by hydrolysis of NaBH4

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