Effect of different alkali metal cations on the oxygen evolution activity and battery capacity of nickel electrodes in concentrated hydroxide electrolytes

Raventos, Andrea Mangel; Kortlever, Ruud

doi:10.1016/j.electacta.2022.140255

Cited by 10 publications

(21 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…A negative shift in onset potential is often attributed to improved electrical conductivity of the electrode or electrolyte, as well as cation intercalation and lattice structural differences between the alloys. 44 It has been reported that the intercalation of alkali metal ions such as K + and Na + between layers of Ni(OH) 2 during the charging process can cause a negative shift in onset potential. 45 This may lead to stabilization of α-Ni(OH) 2 , suppressing its transformation to β-Ni(OH) 2 and favoring the formation of γ-NiOOH.…”

Section: Moomentioning

confidence: 99%

Electrochemical Oxide Growth on Nickel and Commercial Nickel Alloys: Influence of Chromium and Molybdenum

Kretzmer,

Stuve

2023

J. Electrochem. Soc.

View full text Add to dashboard Cite

Nickel-chromium-molybdenum (NiCrMo) alloys are well-known for having exceptional corrosion resistance, but their electrocatalytic properties have not been extensively studied. In this paper, the development of electro-active nickel-oxyhydroxide (NiOOH) phases and kinetics of the oxygen evolution reaction (OER) have been examined on alloys G35, B3, and C276 in alkaline electrolyte at 25°C. Reproducible oxide layers were grown by potential cycling between 0 and 0.65 V vs. Hg/HgO up to 600 cycles, and the transition between Ni(OH)2 and NiOOH was monitored by cyclic voltammetry throughout. Onset potentials, Tafel slopes, and turnover frequencies (TOF) were measured at OER overpotentials between 270 and 390 mV. Alloys with dissimilar Cr:Mo ratios had significantly higher electrochemical surface area and increased γ-NiOOH formation, suggesting higher metal dissolution rates. The equal Cr:Mo concentration alloy and pure Ni developed a primarily β-NiOOH surface, and had 1.8 to 2.0 times larger TOF values than those containing significant γ-NiOOH. The NiCrMo alloys required smaller overpotentials (54-80 mV) to produce 10 mA cm−2 of OER current, and had comparable Tafel slopes to pure Ni. The findings here indicate a β-NiOOH-developed surface to be more OER-active than a γ-NiOOH-developed surface, and suggest certain NiCrMo alloys have promise as OER electrocatalysts.

show abstract

Section: Moomentioning

confidence: 99%

Electrochemical Oxide Growth on Nickel and Commercial Nickel Alloys: Influence of Chromium and Molybdenum

Kretzmer,

Stuve

2023

J. Electrochem. Soc.

View full text Add to dashboard Cite

show abstract

“…57 Raventos et al studied Ni electrode systems with a focus on higher electrolyte concentrations for potential applications in industry. 58 They found that the activity trend is similar (Rb + > Cs + > K + > Na + > Li + ) to trends put forth for low concentration electrolytes in alkaline media. The authors suggest that smaller cations can intercalate in the Ni oxyhydroxide layered double hydroxides (NiOOH-LDH) and therefore stabilize the γ-NiOOH phase which results in a higher OER onset potential.…”

Section: Oxygen Evolution and Reduction Reactionsmentioning

confidence: 59%

Recent advances in the role of interfacial liquids in electrochemical reactions

Baidoun,

Liu,

Kim

2024

Nanoscale

View full text Add to dashboard Cite

show abstract

“…Note that further increasing the concentration of alkali cations without changing pH may not result in significant improvement in catalytic activity (Figure S7), which is consistent with the previous report. [11] Furthermore, the CoOOH can operate stably over 150 h under different hydroxide electrolytes (from Li + to Cs + ) at current density of 10 mA cm À 2 (Figure S8), representing that slight cation intercalation would not significantly influence the stability of CoOOH electrocatalyst.…”

Section: Methodsmentioning

confidence: 96%

Unveiling the Electrolyte Cations Dependent Kinetics on CoOOH‐Catalyzed Oxygen Evolution Reaction

Jia,

Yao,

et al. 2023

Angew Chem Int Ed

View full text Add to dashboard Cite

The electrolyte cations‐dependent kinetics have been widely observed in many fields of electrocatalysis, however, the exact mechanism of the influence on catalytic performance is still a controversial topic of considerable discussion. Herein, combined with operando X‐ray diffraction (XRD) and high‐resolution transmission electron microscopy (HRTEM), we verify that the electrolyte cations could intercalate into the layer of pristine CoOOH catalyst during the oxygen evolution reaction (OER) process, while the bigger cations lead to enlarged interlayer spacing and increased OER activity, following the order Cs+ > K+ > Na+ > Li+. X‐ray absorption spectroscopy (XAS), in situ Raman, in situ Ultraviolet–visible (UV‐vis) spectroscopy, in situ XAS spectroscopy, cyclic voltammetry (CV), and theoretical calculations reveal that the intercalation of electrolyte cations efficiently modify the oxidation states of Co by enlarging the Co–O bonds, which in turn enhance the d‐band center of Co, optimize the adsorption strength of oxygen intermediates, facilitate the formation of OER active Co(IV) species, and reduce the energy barrier of rate‐determing step (RDS), thereby enhancing the OER activity. This work not only provides an informative picture to understand the complicated dependence of OER kinetics on electrolyte cations, but also sheds light on understanding the mechanism of other electrolyte cation‐targeted electrocatalysis.

show abstract

Effect of different alkali metal cations on the oxygen evolution activity and battery capacity of nickel electrodes in concentrated hydroxide electrolytes

Cited by 10 publications

References 31 publications

Electrochemical Oxide Growth on Nickel and Commercial Nickel Alloys: Influence of Chromium and Molybdenum

Electrochemical Oxide Growth on Nickel and Commercial Nickel Alloys: Influence of Chromium and Molybdenum

Recent advances in the role of interfacial liquids in electrochemical reactions

Unveiling the Electrolyte Cations Dependent Kinetics on CoOOH‐Catalyzed Oxygen Evolution Reaction

Contact Info

Product

Resources

About