The electrooxidation of borohydride: A mechanistic study on palladium (Pd/C) applying RRDE, 11B-NMR and FTIR

Grimmer, Christoph; Grandi, Maximilian; Zacharias, Robert; Cermenek, Bernd; Weber, Hansjörg; Morais, Cláudia; Napporn, Têko W.; Weinberger, Stephan; Schenk, Alexander; Hacker, Viktor

doi:10.1016/j.apcatb.2015.07.028

Cited by 32 publications

(21 citation statements)

References 34 publications

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Section: Nah + B(och 3 ) 3 → Nabh 4 + 3naochmentioning

confidence: 99%

“…At the limit of low potentials the accumulation of hydrolysis products of the borohydride was responsible to the increase of the current under stationary conditions since the products were not adsorbed on the surface and were easily removed under non-stationary diffusion condition. Recently, Grimer et al [24] performed a very complete study of the borohydride oxidation reaction at Pd/C by using cyclic voltammetry, rotating disc electrode, chronoamperometry coupled to NMR, and FTIR in situ techniques. According to the analysis of the RDE technique, the number of transferred electrons was 4 at 0.4 V vs. RHE, while at 0.8 V the number of transferred electrons increased to 8 at 0.8 V the reaction is considered complete and at 0.4 V 2 different pathways are possible: one consisting of the total oxidation to BO2 − and the production of two hydrogen molecules and through the second pathway occurred a four electron electrooxidation path resulting in BH2 − species.…”

Section: Nah + B(och 3 ) 3 → Nabh 4 + 3naochmentioning

confidence: 99%

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Ordered PtSn/C Electrocatalyst: A High Performance Material for the Borohydride Electrooxidation Reaction

Bortoloti

Angelo

2017

Catalysts

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This work used a rotating disc electrode and quasi-steady state polarization curves to investigate the sodium borohydride electrooxidation of ordered intermetallic PtSn/C in alkaline solution. Under similar experimental conditions, PtSn/C proved to be a better electrocatalyst than Pt in an overall process that involved eight electrons. Assays performed in the presence of thiourea and S 2− species evidenced that a chemical hydrolysis step took place, followed by electrochemical oxidation of the generated H 2. The results presented herein suggest that PtSn/C constitutes a promising electrode material for application in alkaline borohydride fuel cell.

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Section: Nah + B(och 3 ) 3 → Nabh 4 + 3naochmentioning

confidence: 99%

Section: Nah + B(och 3 ) 3 → Nabh 4 + 3naochmentioning

confidence: 99%

Ordered PtSn/C Electrocatalyst: A High Performance Material for the Borohydride Electrooxidation Reaction

Bortoloti

Angelo

2017

Catalysts

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“…Basic research on the anode catalyst is performed at TU Graz by combining electrochemical RRDR measurements with NMR and FTIR measurements. For a palladium (Pd/C) anode catalyst the results lead to the assumption that in the bulk no intermediates are present [13]. Based on the catalyst development a single cell was built [14].…”

Section: Direct Borohydride Fuel Cellmentioning

confidence: 99%

Progress in hydrogen production and storage technologies

Hacker

Nestl

Friedrich

2016

2016 International Conference on the Domestic Use of Energy (DUE)

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Available hydrogen production and storage technologies do not fulfil the economical, technical and environmental requirements of a hydrogen economy. Existing technological options are characterised and discussed. New technological solutions, investigated at the Institute of Chemical Engineering and Environmental Technologies of TU Graz, are presented. For hydrogen production with low environmental impact, the combination of production, purification and storage in one technology, the reformer-steam-iron process, is introduced. This process integrates conventional steam reforming with a chemical looping process in order to produce pure pressurised hydrogen. For storage a liquid chemical hydrogen storage system based on the borohydride anion is developed. The storage medium is either catalytically dehydrogenated, or is directly fed into a direct borohydride fuel cell. Index Terms-Fuel processing, fuel cells, decentralised power generation, steam-iron-process, ionic liquid. 1 METHOD -STORAGE DENSITYCompressed storage: 350 bar (type IV generation): 5.5wt%, 17.6 kgH2/m³, ambient temp. 700 bar (type IV generation): 5.2wt%, 26.3 kgH2/m³, ambient temp. Liquid storage: 5.6wt%, 70 kg/m3, 23.5 kgH2/m³, 1 bar, 21.15K. Cryo compressed: 5.5-9.2wt%, 41.8-44.7 kgH2/m³, >>1bar, 21.15K Metal Organic Framework MOF177: 4wt%, 34.6 kgH2/m³ Chemical Storage, storage at ambient temperature and pressure Sodium borohydride: 3wt%, 23 kgH2/m³ Alane 4.2wt%, 48 kgH2/m³ Ammonia borane 4.8wt%, 48 kgH2/m³

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“…This enhancement was associated with the favoring of BOR (direct oxidation) and suppression of hydrogen evolution reaction (HER). Furthermore, Grimmer et al [51] studied BOR at Pd/C by cyclic voltammetry, rotating disc electrode (RDE) measurements, chronoamperometry coupled to NMR spectrometry, and in situ Fourier transform infrared spectroscopy (FTIR). RDE results yielded n = 4 (at 0.4 V vs. reversible hydrogen electrode (RHE)) and n = 8 (at 0.8 V vs. RHE).…”

Section: Introductionmentioning

confidence: 99%

Carbon-Supported Trimetallic Catalysts (PdAuNi/C) for Borohydride Oxidation Reaction

et al. 2021

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The synthesis of palladium-based trimetallic catalysts via a facile and scalable synthesis procedure was shown to yield highly promising materials for borohydride-based fuel cells, which are attractive for use in compact environments. This, thereby, provides a route to more environmentally friendly energy storage and generation systems. Carbon-supported trimetallic catalysts were herein prepared by three different routes: using a NaBH4-ethylene glycol complex (PdAuNi/CSBEG), a NaBH4-2-propanol complex (PdAuNi/CSBIPA), and a three-step route (PdAuNi/C3-step). Notably, PdAuNi/CSBIPA yielded highly dispersed trimetallic alloy particles, as determined by XRD, EDX, ICP-OES, XPS, and TEM. The activity of the catalysts for borohydride oxidation reaction was assessed by cyclic voltammetry and RDE-based procedures, with results referenced to a Pd/C catalyst. A number of exchanged electrons close to eight was obtained for PdAuNi/C3-step and PdAuNi/CSBIPA (7.4 and 7.1, respectively), while the others, PdAuNi/CSBEG and Pd/CSBIPA, presented lower values, 2.8 and 1.2, respectively. A direct borohydride-peroxide fuel cell employing PdAuNi/CSBIPA catalyst in the anode attained a power density of 47.5 mW cm−2 at room temperature, while the elevation of temperature to 75 °C led to an approximately four-fold increase in power density to 175 mW cm−2. Trimetallic catalysts prepared via this synthesis route have significant potential for future development.

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The electrooxidation of borohydride: A mechanistic study on palladium (Pd/C) applying RRDE, 11B-NMR and FTIR

Cited by 32 publications

References 34 publications

Ordered PtSn/C Electrocatalyst: A High Performance Material for the Borohydride Electrooxidation Reaction

Ordered PtSn/C Electrocatalyst: A High Performance Material for the Borohydride Electrooxidation Reaction

Progress in hydrogen production and storage technologies

Carbon-Supported Trimetallic Catalysts (PdAuNi/C) for Borohydride Oxidation Reaction

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