Highly active and stable AuNi dendrites as an electrocatalyst for the oxygen reduction reaction in alkaline media

Wang, Jiali; Chen, Fuyi; Jin, Yachao; Johnston, Roy L.

doi:10.1039/c6ta07519c

Cited by 45 publications

(37 citation statements)

References 52 publications

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“…Very recently, Au–M (M = Cu, Ni, Co, and Zn) bimetallic nanostructures have garnered intensive interest due to their unique catalytic activity and durability in the electrocatalysis . Especially, AuNi nanostructures exhibit a promising prospect in catalyzing a variety of reactions.…”

Section: Introductionmentioning

confidence: 99%

“…Especially, AuNi nanostructures exhibit a promising prospect in catalyzing a variety of reactions. [6,12a,13] Our recent study has indicated that the AuNi dendrites by using electrodeposition and additional dealloying process (labeled as AuNi‐DD) showed superior catalytic activity and stability toward ORR compared to the commercial Pt/C. [12a] He et al prepared the carbon supported AuNi nanoparticles by the chemical method, showing that AuNi/C catalyst apparently promoted the electrode kinetics of BH 4 − oxidation.…”

Section: Introductionmentioning

confidence: 99%

“…[6,12a,13] Our recent study has indicated that the AuNi dendrites by using electrodeposition and additional dealloying process (labeled as AuNi‐DD) showed superior catalytic activity and stability toward ORR compared to the commercial Pt/C. [12a] He et al prepared the carbon supported AuNi nanoparticles by the chemical method, showing that AuNi/C catalyst apparently promoted the electrode kinetics of BH 4 − oxidation. [13a] Xiao et al successfully synthesized AuNi nanoparticles on the graphite composite, which exhibited the alloy feature and high activity for hydroquinone.…”

Section: Introductionmentioning

confidence: 99%

“…As a sharp contrast with other methods, electrodeposition offers the advantages of being relatively environmental friendliness, high deposition rate, and easily controlled composition. [12a,13b] Furthermore, electrochemical alloying and dealloying processes in a single electrolyte solution makes it facile and time saving to achieve desirable nanostructures at room temperature. It is also of great significance since such novel strategy circumvents the use of corrosive chemicals and organic surfactants.…”

Section: Introductionmentioning

confidence: 99%

“…The as‐synthesized AuNi NDs exhibit higher bifunctional electrocatalytic performance toward ORR and borohydride oxidation reaction (BOR) compared to the commercial Pt/C in alkaline media, moreover, the AuNi catalyst fabricated by the one‐pot approach shows a pronounced improvement in the ORR activity than that by using electrodeposition and subsequent dealloying process. [6,12a] To the best of author's knowledge, such facile and green one‐pot synthesis has not been reported hitherto. It is believed that this novel strategy provides new guidelines for optimizing nanostructures synthesis, which would be of great importance in investigating their promising activities in catalysis.…”

Section: Introductionmentioning

confidence: 99%

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One‐Pot Synthesis of Dealloyed AuNi Nanodendrite as a Bifunctional Electrocatalyst for Oxygen Reduction and Borohydride Oxidation Reaction

Wang

Chen

Jin

et al. 2017

Adv Funct Materials

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A novel one-pot approach for synthesizing the dealloyed nanomaterials at room temperature is introduced for the first time. In such a synthetic strategy, applying modulated potentials effectively simplifies the traditional dealloying route, which usually requires additional corrosion process to dissolve nonprecious metals. The dealloyed AuNi nanodendrites (AuNi NDs) with tunable composition and uniformly elemental distribution are well developed by the one-pot strategy. Impressively, the as-synthesized AuNi NDs exhibit a higher electrochemically active area and definite improvements in electrocatalytic activity for oxygen reduction reaction (ORR) and borohydride oxidation reaction (BOR) compared to the commercial Pt/C. In particular, the AuNi NDs are 81 mV more positive in half-wave potential and about 3.1 times higher in specific activity (at 0.85 V) for the ORR than Pt/C, together with excellent stability and methanol tolerance. The superior BOR activity is highly promising compared to the previously reported catalysts. The unique nanodendritic structure with Au-rich surface and bimetallic electronic effect is the main factor to greatly enhance the bifunctional catalytic performance for the AuNi NDs. Furthermore, such a newly developed facile method is of great significance because it is one of the first examples to effectively engineer dealloyed bimetallic nanostructures via the practical and low-cost route for electrocatalytic applications.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

One‐Pot Synthesis of Dealloyed AuNi Nanodendrite as a Bifunctional Electrocatalyst for Oxygen Reduction and Borohydride Oxidation Reaction

Wang

Chen

Jin

et al. 2017

Adv Funct Materials

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Self‐Supported Worm‐like PdAg Nanoflowers as Efficient Electrocatalysts towards Ethylene Glycol Oxidation

Yan

Zhang

et al. 2017

ChemElectroChem

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Advancing the intrinsic catalytic performances of electrocatalysts is believed to be an efficient approach for alleviating the energy crisis and environmental pollution. However, many drawbacks of the newly established catalysts such as large size, poor corrosion resistance, and anti‐poisoning make them exhibit limited electrocatalytic performances. To address these challenges, we herein embody the advantages of both composition and morphology to successfully fabricate self‐supported worm‐like PdAg nanoflowers (PdAg NFs) with the assistance of cetyltrimethylammonium bromide. Such special PdAg NFs with a high active surface area of 42.36 m2 g−1 display much better electrocatalytic performances with mass and specific activities of 5545 mA mg−1 and 12.82 mA cm−2 towards ethylene glycol oxidation, which are 6.9 and 2.1 times higher than that of commercial Pd/C, respectively. Our efforts in this work may open up a new way to maximize the electrocatalytic performance of catalysts by designing and adjusting their morphologies. We also trust that the electrocatalysts fabricated in this work can be applied as potential anodic catalysts and beyond.

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Time Resolved Measurements of pH in Aqueous Magnesium‐Air Batteries during Discharge and Its Impact for Future Applications

et al. 2022

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In aqueous magnesium air batteries, the influence of the electrochemical behavior on pH of the electrolyte has not been investigated yet, which has a critical effect on the cell performance. We have monitored the evolution of the pH at various discharge current densities in situ in the Mg‐air primary cells, which produce sparingly soluble magnesium hydroxide (Mg(OH)2). These experiments show the temporal evolution of the pH of the electrolyte in the cell discharge, depending on the current density. The pH first increases rapidly to a maximum of pH 11 and then drops down slowly to the equilibrium at pH 10.7. At the peak pH oversaturation of Mg(OH)2 is paramount, leading to the precipitation which balances the Mg(OH)2 concentration in the electrolyte. This precipitation process coats both cathode and anode which leads to a decrease in cell efficiency and voltage. The results show that the cell design of Mg‐air batteries is important for their lifetime and cell performance. The performance of the aqueous magnesium cell is increased several folds when the design is changed to a simple electrolyte flow cell.

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Highly active and stable AuNi dendrites as an electrocatalyst for the oxygen reduction reaction in alkaline media

Abstract: AuNi hierarchical dendrites were fabricated by a facile electrodeposition and dealloying method with exceptional ORR activity and remarkable long-term stability.

Cited by 45 publications

References 52 publications

One‐Pot Synthesis of Dealloyed AuNi Nanodendrite as a Bifunctional Electrocatalyst for Oxygen Reduction and Borohydride Oxidation Reaction

One‐Pot Synthesis of Dealloyed AuNi Nanodendrite as a Bifunctional Electrocatalyst for Oxygen Reduction and Borohydride Oxidation Reaction

Self‐Supported Worm‐like PdAg Nanoflowers as Efficient Electrocatalysts towards Ethylene Glycol Oxidation

Time Resolved Measurements of pH in Aqueous Magnesium‐Air Batteries during Discharge and Its Impact for Future Applications

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