Synthesis and electrochemical evaluation of nickel hydroxide nanosheets with phase transition to nickel oxide

Lee, Minjeong; Jang, Yeongeun; Yoon, Gayoung; Lee, Seonghwa; Ryu, Gyeong Hee

doi:10.1039/d4ra01120a

RSC Adv.

2024

DOI: 10.1039/d4ra01120a

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Synthesis and electrochemical evaluation of nickel hydroxide nanosheets with phase transition to nickel oxide

Minjeong Lee,

Yeongeun Jang,

Gayoung Yoon

et al.

Abstract: Nickel hydroxide nanosheets are perfectly synthesized, are 3–6 nm thin and exhibit a curly and wrinkled morphology with increasing surfactant concentration. They demonstrate OER activity and are transformed into nickel oxides via heat treatment.

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Cited by 2 publications

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Outstanding Activity and Durability of Supported NiCo₂O₄ Nanoparticles for Direct Ethanol Fuel Cells

Afify,

Hameed,

Mohamed

et al. 2024

Applied Organom Chemis

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The rational design of noble metal‐free electrocatalysts represents one of the basic stones for fuel cell development. With the exploration of eco‐friendly nanomaterials for the investigated alcohol oxidation process, nickel‐based electrodes have been recognized as the most auspicious anodes with promoted activity and stability. In this work, a series of NiCo2O4 nanoparticles were deposited onto graphite sheets (NiCo2O4/T) introducing varied proportions of cobalt oxide species. Co‐precipitation protocol of the respective metallic hydroxides onto the carbonaceous support was followed with consecutive annealing in an air atmosphere at 400°C. The fabricated mixed metallic oxide nanopowder was physically studied using X‐ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive X‐ray analysis (EDX), X‐ray photoelectron spectroscopy (XPS), and selected area electron diffraction (SAED). Uniformly arranged nanoparticles were observed on graphite surface as evidenced by SEM and TEM. The cubic lattice structure of formed NiCo2O4 crystals was also confirmed by XRD through the defined peaks of binary metallic oxides clarifying their successful preparation scheme. The electrocatalytic properties of these NiCo2O4/T nanocatalysts were evaluated for oxidizing ethanol molecules in basic solution. Pronounced oxidation current densities were remarkably measured at NiCo2O4/T electrodes in relation to that at NiO/T. Differing the introduced cobalt oxide content into the synthesized nanocatalyst significantly controlled its catalytic performance. NiCo2O4/T‐20 exhibited the highest activity and stability among the prepared nanomaterials. Much decreased charge transfer resistances were also recorded at this electrode demonstrating its promoted electron transfer characteristics. This work could provide a reasonable route for the simple synthesis of comparable transition metallic oxides with promising attitudes for energy generation purposes.

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Outstanding Activity and Durability of Supported NiCo₂O₄ Nanoparticles for Direct Ethanol Fuel Cells

Afify,

Hameed,

Mohamed

et al. 2024

Applied Organom Chemis

View full text Add to dashboard Cite

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Hydrothermal-Induced Cationic Vacancies in NiAl Hydroxide for Enhanced Oxygen Evolution Activities through Optimization of e_g* Band Broadening

Meng,

Li,

et al. 2024

ACS Appl. Mater. Interfaces

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Nickel-based hydroxides [Ni(OH) 2 ] have attracted significant attention as effective oxygen evolution reaction (OER) catalysts. In recent years, defect engineering has been extensively utilized in Ni(OH) 2 modification research. Numerous studies have confirmed that the generation of defects can expose more active sites and regulate electronic states, particularly through the introduction of Al cationic vacancies, which enhance conductivity and thereby improve the catalytic performance. The traditional method for producing cationic vacancies is electrochemical etching. However, this method generates a limited number of vacancies in the catalysts and has the complex etching process. Herein, we found that when NiAl layered double hydroxides were treated using a hydrothermal process at 100 °C in a KOH solution, more Al cationic vacancies were generated. Compared to the traditional method with an Al leaching efficiency of 24%, our proposed method achieved an Al leaching efficiency of 44%. Meanwhile, the electrochemical results showed that the overpotential was reduced by 110 mV at 10 A/g. Further experiments showed that the enhanced OER activities resulting from an increased number of cationic defects lead to structural distortions, which broaden the e g * band, significantly affecting the rate of electron transfer between the electrocatalyst and external circuitry, thereby enhancing the OER activity. This work presents a promising approach to creating cationic defects in Ni(OH) 2 for high-performance electrocatalysts.

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Synthesis and electrochemical evaluation of nickel hydroxide nanosheets with phase transition to nickel oxide

Abstract: Nickel hydroxide nanosheets are perfectly synthesized, are 3–6 nm thin and exhibit a curly and wrinkled morphology with increasing surfactant concentration. They demonstrate OER activity and are transformed into nickel oxides via heat treatment.

Cited by 2 publications

References 73 publications

Outstanding Activity and Durability of Supported NiCo₂O₄ Nanoparticles for Direct Ethanol Fuel Cells

Outstanding Activity and Durability of Supported NiCo₂O₄ Nanoparticles for Direct Ethanol Fuel Cells

Hydrothermal-Induced Cationic Vacancies in NiAl Hydroxide for Enhanced Oxygen Evolution Activities through Optimization of e_g* Band Broadening

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Synthesis and electrochemical evaluation of nickel hydroxide nanosheets with phase transition to nickel oxide

Abstract: Nickel hydroxide nanosheets are perfectly synthesized, are 3–6 nm thin and exhibit a curly and wrinkled morphology with increasing surfactant concentration. They demonstrate OER activity and are transformed into nickel oxides via heat treatment.

Cited by 2 publications

References 73 publications

Outstanding Activity and Durability of Supported NiCo2O4 Nanoparticles for Direct Ethanol Fuel Cells

Outstanding Activity and Durability of Supported NiCo2O4 Nanoparticles for Direct Ethanol Fuel Cells

Hydrothermal-Induced Cationic Vacancies in NiAl Hydroxide for Enhanced Oxygen Evolution Activities through Optimization of eg* Band Broadening

Contact Info

Product

Resources

About

Outstanding Activity and Durability of Supported NiCo₂O₄ Nanoparticles for Direct Ethanol Fuel Cells

Outstanding Activity and Durability of Supported NiCo₂O₄ Nanoparticles for Direct Ethanol Fuel Cells

Hydrothermal-Induced Cationic Vacancies in NiAl Hydroxide for Enhanced Oxygen Evolution Activities through Optimization of e_g* Band Broadening