Correlation between partial inhibition of hydrogen evolution using thiourea and catalytic activity of AB5-type hydrogen storage alloy towards borohydride electrooxidation

Graś, Małgorzata; Wojciechowski, Jarosław; Lota, Katarzyna; Buchwald, Tomasz; Ryl, Jacek; Lota, Grzegorz

doi:10.1016/j.jallcom.2020.154553

Cited by 9 publications

(3 citation statements)

References 61 publications

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“…The electrolyte solution is 1 mol/L NaOH solution containing 8 g/L of thiourea. Many researchers have found that thiourea can act as a hydrogen recombination inhibitor to prevent H + binding and escaping from the specimen surface [ 27 , 28 ]. The NaOH solution was chosen to prevent corrosion of the steels during electrochemical experiments.…”

Section: Methodsmentioning

confidence: 99%

Correlation between Microstructure and Hydrogen Degradation of 690 MPa Grade Marine Engineering Steel

Tian

Xin

et al. 2021

Materials

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Electrochemical H charging, hydrogen permeation, and hydrogen-induced cracking (HIC) behavior of 690 MPa grade steel substrate and different heat-treatment states (annealed, quenched, normalized, tempered) are investigated by cyclic voltammetry (CV), hydrogen permeation, electrochemical H charging, and slow strain rate tensile test (SSRT). The results show that hydrogen diffuses through the steel with the highest rate in base metal and the lowest rate in annealed steel. The hydrogen-induced cracks in base metal show obvious step shape with tiny cracks near the main crack. The cracks of annealed steel are mainly distributed along pearlite. The crack propagation of quenched steel is mainly transgranular, while the hydrogen-induced crack propagation of tempered steel is along the prior austenite grain boundary. HIC sensitivity of base metal is the lowest due to its fine homogeneous grain structure, small hydrogen diffusion coefficient, and small hydrogen diffusion rate. There are many hydrogen traps in annealed steel, such as the two-phase interface which provides accommodation sites for H atoms and increases the HIC susceptibility.

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Section: Methodsmentioning

confidence: 99%

Correlation between Microstructure and Hydrogen Degradation of 690 MPa Grade Marine Engineering Steel

Tian

Xin

et al. 2021

Materials

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“…It should be noted that this value is described by the second time constant, referring to the hydrogen adsorption (HA) on the electrode surface and the rate of electrochemical reaction. 103 Recently, very interesting works have been presented by Zhang et al 104,105 They created a 3D electrode structure by electrodeposition of Co particles on MWCNTs and supporting body which consisted of cotton cosmetic or waste plastic bag. The preparation process using commercial double-faced adhesive tape is presented in Fig.…”

Section: Role Of Carbon Materials In Dbfcmentioning

confidence: 99%

Control of hydrogen release during borohydride electrooxidation with porous carbon materials

Graś

Lota

2021

RSC Adv.

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“…As mentioned earlier, the anodic BOR is a complex reaction normally accompanied by several parasitic reactions like nonfaradaic heterogeneous hydrolysis of BH 4 − (eqs 4−6) 8 and, the competing faradaic hydrogen evolution reaction (HER) (eq 7), causing the evolution of H…”

Section: Introductionmentioning

confidence: 99%

Selective Borohydride Oxidation Reactions of Zeolitic Imidazolate Framework-Derived Bimetallic Carbon Alloy Electrocatalysts for Alkaline Fuel Cell Applications

Kottarathil

Narayanaru

Unni

et al. 2022

ACS Appl. Energy Mater.

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Direct borohydride fuel cells are a particular class of alkaline direct liquid fuel cells that show interesting performances for mobile applications owing to the use of sodium borohydride (NaBH4) as fuel. The complete electrooxidation of NaBH4 proceeds via an eight-electron pathway. However, due to the inevitable hydrolysis of borohydride at the electrode, the released electrons are usually less than 8. The use of anode catalysts with good performance and high utilization of BH4 – is therefore imperative for practical applications. In this work, we report the development of an anode catalyst derived from trimetallic zeolitic imidazolate framework (ZIF) with M–N x active centers. The trimetallic ZIF precursor (FeCoZn-ZIF) was derived by the codoping of Fe and Co on ZIF-8 synthesized through a fast, aqueous synthesis under ambient conditions. Subsequently, carbonization yielded a carbon alloy catalyst (FeCo-ZNC) with enhanced porosity. The nanotubular structure of the formed carbon assisted in faster electron transport, and the oxidation current density of FeCo-ZNC reached 56.5 mA cm–2 at 0.61 V during electrocatalytic NaBH4 oxidation under alkaline conditions. The enhanced electrocatalytic performance induced by the morphological and textural features of FeCo-ZNC along with active reaction centers such as pyridinic N, graphitic N, and Co–N x enabled NaBH4 electrooxidation via an eight-electron transfer, indicating its potential as a promising catalyst for borohydride oxidation reactions (BORs).

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Correlation between partial inhibition of hydrogen evolution using thiourea and catalytic activity of AB5-type hydrogen storage alloy towards borohydride electrooxidation

Cited by 9 publications

References 61 publications

Correlation between Microstructure and Hydrogen Degradation of 690 MPa Grade Marine Engineering Steel

Correlation between Microstructure and Hydrogen Degradation of 690 MPa Grade Marine Engineering Steel

Control of hydrogen release during borohydride electrooxidation with porous carbon materials

Selective Borohydride Oxidation Reactions of Zeolitic Imidazolate Framework-Derived Bimetallic Carbon Alloy Electrocatalysts for Alkaline Fuel Cell Applications

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