Rhodium-decorated nanoconical nickel electrode synthesis and characterization as an electrochemical active cathodic material for hydrogen production

Skibińska, Katarzyna; Kutyła, Dawid; Yang, Xuegeng; Krause, Lukas; Marzec, Mateusz; Żabiński, Piotr

doi:10.1016/j.apsusc.2022.153326

Cited by 16 publications

(14 citation statements)

References 63 publications

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“…The presence of the capping agent NH 4 Cl during sample synthesis supports the formation of nanocone structures. 27,30,40,48 This aspect is also exemplified by the AFM scan visualizations in Figure 2A with increasing concentrations of c NH4Cl = 0 (sample 1), 20 (sample 2), and 40 (sample 3) g/L and reflected in the increase in the average surface roughness S a of the samples in Figure 2B. Due to the effect of the Lorentz force and the magnetic gradient force, the action of which is caused by the ferromagnetic Ni deposit, magneto-hydrodynamic flows occur, which stimulate the mass transport to the electrode.…”

Section: Resultsmentioning

confidence: 99%

“…30,39 Nanoscale conical structures were electrodeposited on samples 2 and 3 using NH 4 Cl as a capping agent at concentrations c NH4Cl of 20 and 40 g/L. 27,30,40 Both samples were produced with a deposition time t dep of 5 min and at a temperature T dep of 60 °C in an electrolyte solution of 200 g/L NiCl 2 •6H 2 O and 100 g/L H 3 BO 3 . The pH value was adjusted to 4 by adding NaOH.…”

Section: Synthesis Of the Electrocatalyst Coatingsmentioning

confidence: 99%

“…20 One-step electrodeposition, with the use of capping agents that modify the crystallization, enables the template-free, cost-effective production of highly active nanostructures that are made from inexpensive materials 27−29 and whose activity can be further enhanced by the addition of minuscule amounts of Pt group metals. 30 In addition to altering the wettability properties, the usage of micro-or nanostructuring makes it possible to enlarge the electrocatalytically active surface area (ECSA) that is involved in the reaction. 28,31−34 Structured, inexpensive electrocatalyst materials such as Ni have sometimes been reported to outperform expensive, highly active benchmark catalysts such as Pt/C.…”

Section: Introductionmentioning

confidence: 99%

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Hydrogen Bubble Size Distribution on Nanostructured Ni Surfaces: Electrochemically Active Surface Area Versus Wettability

Krause

Skibińska

Rox

et al. 2023

ACS Appl. Mater. Interfaces

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Emerging manufacturing technologies make it possible to design the morphology of electrocatalysts on the nanoscale in order to improve their efficiency in electrolysis processes. The current work investigates the effects of electrodeattached hydrogen bubbles on the performance of electrodes depending on their surface morphology and wettability. Ni-based electrocatalysts with hydrophilic and hydrophobic nanostructures are manufactured by electrodeposition, and their surface properties are characterized. Despite a considerably larger electrochemically active surface area, electrochemical analysis reveals that the samples with more pronounced hydrophobic properties perform worse at industrially relevant current densities. High-speed imaging shows significantly larger bubble detachment radii with higher hydrophobicity, meaning that the electrode surface area that is blocked by gas is larger than the area gained by nanostructuring. Furthermore, a slight tendency toward bubble size reduction of 7.5% with an increase in the current density is observed in 1 M KOH.

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Section: Resultsmentioning

confidence: 99%

Section: Synthesis Of the Electrocatalyst Coatingsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Hydrogen Bubble Size Distribution on Nanostructured Ni Surfaces: Electrochemically Active Surface Area Versus Wettability

Krause

Skibińska

Rox

et al. 2023

ACS Appl. Mater. Interfaces

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“…This technique allows the surface’s decoration without destroying the substrate’s structure. The galvanic displacement process also forms a continuous layer, which is beneficial for durability in hydrogen/oxygen evolution reactions [ 30 , 31 , 32 , 33 ]. In this particular issue, the open-circuit potential is measured for nickel flat and porous samples, and galvanic displacement can be used for the coverage measurement of the Pd on the nickel surface.…”

Section: Resultsmentioning

confidence: 99%

Electrocatalytic Performance of Ethanol Oxidation on Ni and Ni/Pd Surface-Decorated Porous Structures Obtained by Molten Salts Deposition/Dissolution of Al-Ni Alloys

Kutyła

Nakajima

Fukumoto

et al. 2023

IJMS

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Ni coatings with high catalytic efficiency were synthesised in this work, obtained by increasing the active surface and modifying Pd as a noble metal. Porous Ni foam electrodes were obtained by electrodeposition of Al on a nickel substrate. Deposition of Al was carried out with potential −1.9 V for a time of 60 min in NaCl–KCl-3.5 mol%AlF3 molten salt mixture at 900 °C, which is connected with the formation of the Al-Ni phase in the solid state. Dissolution of Al and Al-Ni phases was performed by application of the potential −0.5 V, which provided the porous layer formation. The obtained porous material was compared to flat Ni plates in terms of electrocatalytic properties for ethanol oxidation in alkaline solutions. Cyclic voltammetry measurements in the non-Faradaic region revealed the improvement in morphology development for Ni foams, with an active surface area 5.5-times more developed than flat Ni electrodes. The catalytic activity was improved by the galvanic displacement process of Pd(II) ions from dilute chloride solutions (1 mM) at different times. In cyclic voltammetry scans, the highest catalytic activity was registered for porous Ni/Pd decorated at 60 min, where the maximum oxidation peak for 1 M ethanol achieved +393 mA cm−2 compared to the porous unmodified Ni electrode at +152 mA cm−2 and flat Ni at +55 mA cm−2. Chronoamperometric measurements in ethanol oxidation showed that porous electrodes were characterised by higher catalytic activity than flat electrodes. In addition, applying a thin layer of precious metal on the surface of nickel increased the recorded anode current density associated with the electrochemical oxidation process. The highest activity was recorded for porous coatings after modification in a solution containing palladium ions, obtaining a current density value of about 55 mA cm−2, and for a flat unmodified electrode, only 5 mA cm−2 after 1800 s.

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“…The superhydrophobic properties of coatings are also in interest of scientists [43]. Research groups have been collaborating with international groups from Germany [44][45][46][47], Japan [48][49][50][51][52], France [53], Algeria [54] [87][88][89][90][91] is also an important issue for scientists. The topic of SOFC [92] is explored as well.…”

Section: Agh University Of Science and Technologymentioning

confidence: 99%

Electrochemistry at Krakowian research institutions

Skibińska

Żabiński

2023

J Solid State Electrochem

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The electrochemistry research team activity from Poland is marked by significant increase in the last 20 years. The joining of European Community in 2004 gives an impulse for the development of Polish science. The development of electrochemistry has been stimulated by cooperation with industry and the establishment of technology transfer centers, technology parks, business incubators, etc. and the mostly by simplified international collaborations. Five research institutions from Krakow reports work in the field of electrochemistry. The achievements of all teams are briefly described.

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Rhodium-decorated nanoconical nickel electrode synthesis and characterization as an electrochemical active cathodic material for hydrogen production

Cited by 16 publications

References 63 publications

Hydrogen Bubble Size Distribution on Nanostructured Ni Surfaces: Electrochemically Active Surface Area Versus Wettability

Hydrogen Bubble Size Distribution on Nanostructured Ni Surfaces: Electrochemically Active Surface Area Versus Wettability

Electrocatalytic Performance of Ethanol Oxidation on Ni and Ni/Pd Surface-Decorated Porous Structures Obtained by Molten Salts Deposition/Dissolution of Al-Ni Alloys

Electrochemistry at Krakowian research institutions

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