Complex performance of novel CoNiMnB electrodeposits in alkaline borohydride solutions

Mitov, Mario; Hristov, Georgi; Hristova, Elitsa; Rashkov, R.; Arnaudova, Marina; Zielonka, A.

doi:10.1007/s10311-008-0153-2

Cited by 16 publications

(12 citation statements)

References 13 publications

(17 reference statements)

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“…As expected, VS substrate covered with CoMn (red curve) shows the best catalytic activity. The properties of this electrode are better than for CoMn, deposited on Ni foam [5,6], because the authors were not able to cover the foam from inside the pores. So first, the effect of the catalyst layer composition was lowered with at the same time increased substrate influence.…”

Section: Resultsmentioning

confidence: 95%

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New Cathode Materials for the Anion Exchange Membrane Electrolyzer (AEM)

Manolova¹,

Schoeberl²,

Bretzler³

et al. 2014

Fuel Cells

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An anion exchange membrane electrolyzer (AEM) should combine the positive qualities of the Alkaline Water Electrolysis and the proton exchange membrane (PEM) Electrolysis – compactness, environmentally friendly, effectively and being economically priced. Here, we present improvements of the used substrate materials and of the deposited coatings for developing an AEM with such characteristics. Ni‐wire mesh, stainless steel non‐woven fabrics and stainless steel web were tested as cathode substrate. Base alloys of NiWTiOx, CoNiMoW, CoMn, porous Ni, and porous Ni with TiOx were potentiostatically and galvanostatically deposited. The effect of a single substrate and electrolyte component is graphically shown. We established that, the rougher the structure of an alloy is, the better the electrochemical properties are. The cathode separators were analyzed through EDS‐analysis, light microscopy and REM‐investigations. The electrochemical characterizing was performed galvanostatically in 1 M KOH. The combination substrate‐alloy, which shows the very best electrochemical properties, will be tested in real conditions.

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Section: Resultsmentioning

confidence: 95%

“…CoMnB-multilayers on Ni-foam were used as catalyst at the NaBH 4 -hydrolysis [5,6] and their activity for the hydrogen evolution reaction (HER) is comparable with other Co based substrates or Ni-electrodes [7].…”

Section: Introductionmentioning

confidence: 99%

New Cathode Materials for the Anion Exchange Membrane Electrolyzer (AEM)

Manolova¹,

Schoeberl²,

Bretzler³

et al. 2014

Fuel Cells

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“…Such catalysts generally show high reactivity in terms of hydrogen generation rate (HGR) and total conversion (TC) of NaBH 4 . To further gain reactivity, Co z B can be doped by F [26], P [11], Cr [27], Mn [28], Ni [29], Fe [30], Pd [31] or W [32].…”

Section: Cobalt Catalysts In Various Statesmentioning

confidence: 99%

Cobalt, a reactive metal in releasing hydrogen from sodium borohydride by hydrolysis: A short review and a research perspective

et al. 2010

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1) According to the definition given by the U.S. Department of Energy, a gravimetric hydrogen storage capacity (GHSC) is the capacity of the storage system taken as a whole (i.e. hydride, tank, valves, pipes and so on). It is different from the gravimetric hydrogen density (HD) of a hydride as it takes into account the H content only. Hence, the HD cannot be directly compared to the GHSC.2) One might assume that the hydride weight represents about 50 % of the weight of the filled storage system.Cobalt is commonly admitted as being a promising catalyst in accelerating NaBH 4 hydrolysis, being as reactive as noble metals and much more cost-effective. This is the topic of the present paper. Herein, we survey (i) the NaBH 4 -devoted literature while especially focusing on the Co catalysts and (ii) our work on the same topic. Finally, we report (iii) reactivity results of newly developed Co-based catalysts. From both surveys, it mainly stands out that Co has been investigated as catalysts in various forms: namely, as chlorides, reduced nanoparticles (metal Co, Co boride, Co-B alloy), supported over supports and shaped. In doing so the reactivity can be easily varied achieving H 2 generation rates from few to >1000 L(H 2 )/min·g (metal). Nevertheless, our work can be distinguished from the NaBH 4 literature. Indeed, we are working on strategies that focus on making alternative Co-based catalysts. One of these strategies is illustrated here as we report new reactivity data of Co-based bimetallic supported catalysts. For example, we show that 20 wt% Co 90 Y 10 /Al 2 O 3 -20 wt% Co 95 Hf 5 /Al 2 O 3 > 20 wt% Co 99 Zr 1 /Al 2 O 3 > 20 wt% Co/Al 2 O 3 , the best catalysts showing HGRs of about 245 mL(H 2 )/min or 123 L(H 2 ) /min·g (metals). bimetallic catalyst, cobalt, heterogeneous catalysis, hydrogen, hydrolysis, sodium borohydride, sodium tetrahydroborate

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“…Complete replacement of the precious metal by a non-precious one in the binary catalyst followed by their supporting on a relevant non-precious substrate with pronounced outstanding properties has been tested. Nowadays, non-precious systems, such as Ni-Cr [37], Ni/ ZnNi/Ni/Cu [38] and CoNiMnB [39], are particularly attractive; however, they have not yet been adequately studied and call for further investiga-tions. Alternative techniques of partial or full replacement of a non-precious metal by the precious one have also been used.…”

Section: Introductionmentioning

confidence: 99%

Investigation of stability of gold nanoparticles modified zinc–cobalt coating in an alkaline sodium borohydride solution

Zabielaitė¹,

Šimkūnaitė²,

Balčiūnaitė³

et al. 2020

chemija

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The electrochemical stability and durability of ZnCo alloy thin layers deposited on the titanium surface (denoted as ZnCo/Ti) and those modified by small amounts of Au nanoparticles (denoted as AuZnCo/Ti) prepared via the electrochemical metal deposition technique and a simple galvanic displacement have been investigated in alkaline sodium borohydride (NaBH4) solutions. The physical properties of the fabricated AuZnCo/Ti catalysts have been examined using field emission scanning electron microscopy (FESEM), energy dispersive X-ray analysis (EDX) and inductively coupled plasma optical emission spectroscopy (ICP-OES). The electrocatalytic activity of the ZnCo/Ti and AuZnCo/Ti catalysts toward the oxidation of NaBH4 has been evaluated in an alkaline medium using cyclic voltammetry (CV) and chronoamperometry (CA), whereas the catalytic efficiency of the catalysts for the hydrolysis reaction of NaBH4 has been also examined by measuring the amount of generated hydrogen via the classic water-displacement method. It has been determined that the modification of the ZnCo alloy coating by Au nanoparticles apparently improves not only the morphology and structure of the catalyst, but also the activity and stability of the one for the oxidation of NaBH4 in an alkaline medium as compared to those of ZnCo/Ti and bare Au. The AuZnCo/Ti catalysts that have Au loadings of 63 and 306 µg cm–2 give ca. 12 and 11, respectively, times higher NaBH4 oxidation current densities as compared to those of the bare Au catalyst. Moreover, the AuZnCo/Ti catalysts catalyze the hydrolysis reaction of NaBH4 in alkaline solutions.

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Complex performance of novel CoNiMnB electrodeposits in alkaline borohydride solutions

Cited by 16 publications

References 13 publications

New Cathode Materials for the Anion Exchange Membrane Electrolyzer (AEM)

New Cathode Materials for the Anion Exchange Membrane Electrolyzer (AEM)

Cobalt, a reactive metal in releasing hydrogen from sodium borohydride by hydrolysis: A short review and a research perspective

Investigation of stability of gold nanoparticles modified zinc–cobalt coating in an alkaline sodium borohydride solution

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