Amorphous NiCo2O4 decorated Pd/C as electrocatalysts for boosting ethanol oxidation reaction in alkaline media

Wang, Meiling; Liu, Dong; Jia, Wen-yu; Zhao, Jin; Ma, Jiwei; Ma, Dongze; Tang, Tao; Hu, Tianjun; Jia, Jianfeng; Wu, Huang

doi:10.1016/j.electacta.2022.140048

Cited by 9 publications

(4 citation statements)

References 59 publications

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“…Notably, this method of decorating Pd nanoparticles on NiCo 2 O 4 nanoplates, which does not require any reducing agents or surfactants, is advantageous for maintaining a clean catalyst surface. This approach is anticipated to promote the exposure of more surface-active sites, thereby enhancing the electrocatalytic activity. , …”

Section: Resultsmentioning

confidence: 99%

“…This approach is anticipated to promote the exposure of more surface-active sites, thereby enhancing the electrocatalytic activity. 45,56 The crystallographic structure of the synthesized samples was revealed using the XRD technique. The resulting XRD patterns of the synthesized NiCo-LDH, NiCo 2 O 4 , and different Pd/NiCo 2 O 4 composite samples are displayed in Figure 1b.…”

Section: Methodsmentioning

confidence: 99%

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Revealing the Impact of Pulsed Laser-Produced Single-Pd Nanoparticles on a Bimetallic NiCo₂O₄ Electrocatalyst for Energy-Saving Hydrogen Production via Hybrid Water Electrolysis

Senthil,

Jung,

Min

et al. 2024

ACS Catal.

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Nowadays, the assembling of hybrid water electrolysis using a hydrazine oxidation reaction (HzOR) instead of a slow anodic oxygen evolution reaction (OER) has been established as a favorable technology for efficient hydrogen (H 2 ) production. Nevertheless, it is still critical to develop highly effective bifunctional electrocatalysts for both hydrogen evolution reaction (HER) and HzOR. In this work, we propose a facile approach for the design and synthesis of single-Pd-nanoparticles-decorated bimetallic NiCo 2 O 4 nanoplates as a bifunctional electrocatalyst for both HER and HzOR. Initially, the NiCo 2 O 4 nanoplates are synthesized by a combination of hydrothermal reaction and high-temperature calcination. Subsequently, single-Pd nanoparticles with varying proportions are decorated on NiCo 2 O 4 nanoplates via facile pulsed laser irradiation (PLI), leading to the formation of Pd/NiCo 2 O 4 composites. The optimized Pd/NiCo 2 O 4 composite shows a remarkable electrocatalytic ability with a low overpotential of 294 mV for the HER and an ultrasmall working potential of −6 mV (vs RHE) for the HzOR at 10 mA cm −2 in a 1 M KOH electrolyte. Thus, an overall hydrazine splitting (OHzS) electrolyzer with the Pd/NiCo 2 O 4 ∥Pd/NiCo 2 O 4 system presents the current densities of 10 and 100 mA cm −2 at respective low cell voltages of 0.35 and 0.94 V. Notably, in situ/operando Raman spectroscopy confirms the surface formation of α-Co(OH) 2 during the HER and γ-NiOOH during the HzOR. Furthermore, the density function theory (DFT) calculations demonstrate that the decoration of Pd onto NiCo 2 O 4 facilitates the optimization of both the hydrogen adsorption free energy (ΔG H* ) and enhancement of hydrazine dehydrogenation kinetics. This work introduces a facile strategy for fabricating bifunctional electrocatalysts, potentially useful in energy-saving H 2 production.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Revealing the Impact of Pulsed Laser-Produced Single-Pd Nanoparticles on a Bimetallic NiCo₂O₄ Electrocatalyst for Energy-Saving Hydrogen Production via Hybrid Water Electrolysis

Senthil,

Jung,

Min

et al. 2024

ACS Catal.

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“…For example, Zhang et al 62 reported palladium-based amorphous alloy nanoparticles for efficient EOR. Wang et al 63 synthesized Pd/C decorated on amorphous NiCo 2 O 4 as a highly active electrocatalyst for the EOR. The amorphous structure of NiO x /CN x was confirmed by SAED and HRTEM images (Figure 1d,e).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Electrocatalytic Oxidation of Urea and Ethanol on Two-Dimensional Amorphous Nickel Oxide Encapsulated on N-Doped Carbon Nanosheets

Shekhawat

Samanta

Panigrahy

et al. 2023

ACS Appl. Energy Mater.

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Hydrogen production from water electrolysis is of great interest for attaining sustainable clean energy storage and conversion, but the required working voltage (>1.23 V) in water splitting limits its applications in industrial expansion. Therefore, replacing the oxygen evolution reaction (OER) with a more favorable anodic oxidation reaction, which can provide more valuable products and less working voltage, will be of great significance for the upcoming expansion of hydrogen production in industrial applications. In this report, a two-dimensional (2D) amorphous sheet-like nickel oxide encapsulated on the nitrogendoped carbon (NiO x /CN x ) composite was synthesized for the urea oxidation reaction (UOR) and ethanol oxidation reaction (EOR). Remarkably, the catalyst shows 1.647, 1.378, and 1.354 V vs. reversible hydrogen electrode (RHE) potential at 10 mA/cm 2 current density for OER, UOR, and EOR, respectively, with good stability. The overall water, urea, and ethanol electrolyses of NiO x /CN x were carried out by coupling with commercial Pt/C as a cathode which shows only 1.626, 1.43, and 1.414 V cell potential at 20 mA/cm 2 current density. The catalyst also shows excellent chronopotentiometric and dynamic stability toward all the electrolyses. The high catalytic activity of NiO x /CN x may be attributed to the synergistic interaction between the support and materials, amorphous structure, 2D sheet-like morphology, porous structure, and high electrochemical surface area. This finding shows that NiO x /CN x nanosheets can replace noble metal-based catalysts for efficient anodic oxidation reactions.

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“…Pd/NiCo 2 O 4 /C --3541 [36] NaNbO 3 @Pd/C À 0.35 [a] -1157 [37] Pd/Ni-SnO 2 /C --3101 [38] PdSn/TiO 2 -GO --3000 [39] [a] the onset recorded against RHE.…”

Section: Experimental Section Materialsmentioning

confidence: 99%

Nano‐Nickel Doped Carbon Xerogel: Synthesis, Characterization and Catalytic Performance towards Ethanol Fuel Electro‐oxidation

et al. 2023

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In this work, the synergism between the nano nickel particles and its carbon xerogel support, CX, together with their graphite substrate, G, leads to an efficient Nickel/CX/G electrode for electrocatalysis of ethanol oxidation reaction, EOR. The preparation conditions are optimized. The optimum electrode is made of 6 % weight of Ni doped in CX matrix and drop‐casted on a graphite surface, Ni‐6/CX/G. The catalyst structure and morphology are investigated using XRD, SEM, TEM and FTIR techniques. The electrochemical activity towards EOR is tested in 1 M NaOH+1 M Ethanol solutions by cyclic voltammetry combined with a rotating ring disk electrode. The optimum electrode shows an oxidation peak current density value of 5925 normalA.gnormalNnormali-1 ${{\rm A}.{{\rm g}}_{{\rm N}{\rm i}}^{-1}}$ and considerable stability. This electrode may serve as a good candidate for the anode in the Direct Alkaline Ethanol Fuel Cell, DAEFC.

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Amorphous NiCo2O4 decorated Pd/C as electrocatalysts for boosting ethanol oxidation reaction in alkaline media

Cited by 9 publications

References 59 publications

Revealing the Impact of Pulsed Laser-Produced Single-Pd Nanoparticles on a Bimetallic NiCo₂O₄ Electrocatalyst for Energy-Saving Hydrogen Production via Hybrid Water Electrolysis

Revealing the Impact of Pulsed Laser-Produced Single-Pd Nanoparticles on a Bimetallic NiCo₂O₄ Electrocatalyst for Energy-Saving Hydrogen Production via Hybrid Water Electrolysis

Electrocatalytic Oxidation of Urea and Ethanol on Two-Dimensional Amorphous Nickel Oxide Encapsulated on N-Doped Carbon Nanosheets

Nano‐Nickel Doped Carbon Xerogel: Synthesis, Characterization and Catalytic Performance towards Ethanol Fuel Electro‐oxidation

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Amorphous NiCo2O4 decorated Pd/C as electrocatalysts for boosting ethanol oxidation reaction in alkaline media

Cited by 9 publications

References 59 publications

Revealing the Impact of Pulsed Laser-Produced Single-Pd Nanoparticles on a Bimetallic NiCo2O4 Electrocatalyst for Energy-Saving Hydrogen Production via Hybrid Water Electrolysis

Revealing the Impact of Pulsed Laser-Produced Single-Pd Nanoparticles on a Bimetallic NiCo2O4 Electrocatalyst for Energy-Saving Hydrogen Production via Hybrid Water Electrolysis

Electrocatalytic Oxidation of Urea and Ethanol on Two-Dimensional Amorphous Nickel Oxide Encapsulated on N-Doped Carbon Nanosheets

Nano‐Nickel Doped Carbon Xerogel: Synthesis, Characterization and Catalytic Performance towards Ethanol Fuel Electro‐oxidation

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Product

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Revealing the Impact of Pulsed Laser-Produced Single-Pd Nanoparticles on a Bimetallic NiCo₂O₄ Electrocatalyst for Energy-Saving Hydrogen Production via Hybrid Water Electrolysis

Revealing the Impact of Pulsed Laser-Produced Single-Pd Nanoparticles on a Bimetallic NiCo₂O₄ Electrocatalyst for Energy-Saving Hydrogen Production via Hybrid Water Electrolysis