Self-Grown Ni(OH)<sub>2</sub> Layer on Bimodal Nanoporous AuNi Alloys for Enhanced Electrocatalytic Activity and Stability

Han, Gao‐Feng; Xiao, Beibei; Lang, Xing‐You; Wen, Zi; Zhu, Yongfu; Zhao, Ming; Li, Jian-Chen; Jiang, Q.

doi:10.1021/am504541a

Cited by 25 publications

(11 citation statements)

References 46 publications

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“…The electrochemical redox mechanism of glucose at Co(OH) 2 /GCE can be illustrated by the following process: first, glucose is transported to the Co(OH) 2 -modified electrode surface by diffusion. [11] Next, glucose is adsorbed on to the Co(OH) 2 /GCE surface active sites, which is in preparation for the reaction. Then, Co(OH) 2 is electrochemically oxidized to form CoOOH, which reacts with adsorbed glucose, and this causes electrochemical oxidation of glucose.…”

Section: Resultsmentioning

confidence: 99%

Fast Synthesis of Hierarchical Co(OH)2 Nanosheet Hollow Spheres with Enhanced Glucose Sensing

Cao

Chen

et al. 2016

Eur J Inorg Chem

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Abstract:In this report, hierarchical cobalt hydroxide [Co(OH) 2 ] hollow spheres composed of nanosheets were synthesized by fast etching of polycrystalline cuprous oxide and were then applied for the nonenzymatic electrochemical detection of glucose. The fabricated hierarchical Co(OH) 2 nanosheet hollow spheres were characterized by X-ray photoelectron spectroscopy, X-ray diffraction, field-emission scanning electron microscopy, transmission electron microscopy, and selected area electron diffraction. The electrochemical performance of the hierarchical Co(OH) 2 nanosheet hollow spheres modified

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Section: Resultsmentioning

confidence: 99%

Fast Synthesis of Hierarchical Co(OH)2 Nanosheet Hollow Spheres with Enhanced Glucose Sensing

Cao

Chen

et al. 2016

Eur J Inorg Chem

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“…The boundaries/interface between Au and metal oxide acted as active sites for CO oxidation, thus a maximum activity were achieved by building a high density of Au/oxide boundaries 41 . Similar structures have been considered in many Au-metal oxide catalyst systems 5,36,42 . In this layered structure, Au nanoparticles were dispersed on the Ni atom layer which then created a large Au/Ni(OH) 2 interface for the CO oxidation during the electrochemical treatment.…”

Section: Resultsmentioning

confidence: 71%

“…It also further confirms the charge-transfer of O 2 . As previously reported 42 , the Au atoms on Ni(OH) 2 were considered moved via fast surface diffusion during Ni redox in the potential cycling, while Ni atoms was exposed to the alkaline electrolytes for the production of Ni(OH) 2 on the surface. These atoms are then further attracted to the surface of ligaments via vacancy exchange due to their strong affinity for OH − in the electrochemical system.…”

Section: Resultsmentioning

confidence: 99%

Efficient Dual-Site Carbon Monoxide Electro-Catalysts Via Interfacial Nano-Engineering

Huang

Wang

2017

Meet. Abstr.

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Durable, highly efficient, and economic sound electrocatalysts for CO electrooxidation (COE) are the emerging key for wide variety of energy solutions, especially fuel cells and rechargeable metal−air batteries. Herein, we report the novel system of nickel−aluminum double layered hydroxide (NiAl-LDH) nanoplates on carbon nanotubes (CNTs) network. The formulation of such complexes system was to be induced through the assistance of gold nanoparticles in order to form dual-metal active sites so as to create a extended Au/NiO two phase zone. Bis (trifluoromethylsulfonyl)imide (NTf 2 ) anion of ionic liquid electrolyte was selected to enhance the CO/O 2 adsorption and to facilitate electrocatalyzed oxidation of Ni (OH) 2 to NiOOH by increasing the electrophilicity of catalytic interface. The resulting neutral catalytic system exhibited ultra-high electrocatalytic activity and stability for CO electrooxidation than commercial and other reported precious metal catalysts. The turnover frequency (TOF) of the LDH-Au/CNTs COE catalyst was much higher than the previous reported other similar electrocatalysts, even close to the activity of solid-gas chemical catalysts at high temperature. Moreover, in the long-term durability testing, the negligible variation of current density remains exsisting after 1000 electrochemistry cycles.Advanced electrocatalysts can power sustainable and efficient fuel cells, metal-air batteries, and electrolyzers. Major advances have been made arising from the emerging field of "surface electrocatalysis" in terms of not only electrocatalysis, but also energy conversion. Low-temperature CO electrooxidation (COE) is one of the most significant processes that critical for the large scale production and storage of natural gas in the chemical form. However, CO catalytic oxidation proceeds at the gas-solid interface through a multi-step kinetically sluggish electron transfer, which may result in deteriorating CO electrocatalysis, and so forth. Effective and sustainable electrocatalysts can reduce the over-potential, expedite the reaction, and maintain the stability, all of which can largely boost the energy conversion efficiency. Traditional Pt/Ru-based alloys in acidic solution have been used as alternatives to more active and CO tolerant electrocatalysts 1 . However, the CO tolerance and activity is still insufficient for commercialization.The heterogeneous catalysts with enhanced activities at high temperatures have been recently studied due to the development of multicomponent active sites, particularly Au-metal hydroxide and oxide interfaces. In this condition, dual-metal catalytic sites with Au adjacent to oxide have shown higher catalytic activity for CO oxidation via two pathways, (1) increasing the perimeter of the boundary area for gas adsorption, and (2) forming higher activity metal complex with designed metal/ligands combination 2-6 . However, most high activity catalysis systems are in solid/gas-phase chemical system at high temperatures. Promoted electrocatalyst/electrolyte system at room ...

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“…The rGO use increases the surface area providing dense active sites, electrical conductivity, durability and mechanical stability 29,30 . The combination of gold with nickel in electrochemical sensors, as already reported in studies, yields excellent results regarding the electrocatalytic activity, durability, poisoning resistance and increased charge transfer 28,[31][32][33] .…”

Section: Introductionmentioning

confidence: 56%

Electrochemical Sensor for Ethylene Glycol using Reduced Graphene Oxide/AuNp/Ni(OH)2 Modified Glassy Carbon Electrode

et al. 2021

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An electrochemical sensor based on a modified glassy carbon electrode (GCE) with reduced graphene oxide and Ni-Au nanoparticles (Ni(OH) 2 /AuNp/rGO/GCE) was developed for the determination of ethylene glycol. The graphene oxide was reduced electrochemically at the electrode surface by chronoamperometry, the gold nanoparticles were deposited by chronopotentiometry while the nickel hydroxide nanoparticles were deposited by cyclic voltammetry. The characterization of graphene oxide was performed by Raman spectroscopy, X-ray diffraction (XRD) and transmission-mode scanning electron microscopy (TSEM), while the modified electrodes were characterized by scanning electron microscopy (SEM) and electron dispersive spectroscopy (EDS) analysis. The determination of ethylene glycol was performed by cyclic voltammetry due to the regeneration of the active sites, preventing loss of the sensor signal. The modified GCE with rGO and Ni(OH) 2 /AuNp showed a good performance obtaining a linear range of 0.24 to 1.4 mmol L -1 with a correlation coefficient of 0.9903, limits of detection and quantification (49 and 162 µmol L -1 , respectively) and high stability with 500 continuous analysis cycles.

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Self-Grown Ni(OH)₂ Layer on Bimodal Nanoporous AuNi Alloys for Enhanced Electrocatalytic Activity and Stability

Cited by 25 publications

References 46 publications

Fast Synthesis of Hierarchical Co(OH)2 Nanosheet Hollow Spheres with Enhanced Glucose Sensing

Fast Synthesis of Hierarchical Co(OH)2 Nanosheet Hollow Spheres with Enhanced Glucose Sensing

Efficient Dual-Site Carbon Monoxide Electro-Catalysts Via Interfacial Nano-Engineering

Electrochemical Sensor for Ethylene Glycol using Reduced Graphene Oxide/AuNp/Ni(OH)2 Modified Glassy Carbon Electrode

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Self-Grown Ni(OH)2 Layer on Bimodal Nanoporous AuNi Alloys for Enhanced Electrocatalytic Activity and Stability

Cited by 25 publications

References 46 publications

Fast Synthesis of Hierarchical Co(OH)2 Nanosheet Hollow Spheres with Enhanced Glucose Sensing

Fast Synthesis of Hierarchical Co(OH)2 Nanosheet Hollow Spheres with Enhanced Glucose Sensing

Efficient Dual-Site Carbon Monoxide Electro-Catalysts Via Interfacial Nano-Engineering

Electrochemical Sensor for Ethylene Glycol using Reduced Graphene Oxide/AuNp/Ni(OH)2 Modified Glassy Carbon Electrode

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Product

Resources

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Self-Grown Ni(OH)₂ Layer on Bimodal Nanoporous AuNi Alloys for Enhanced Electrocatalytic Activity and Stability