Investigation of cubic Pt alloys for ammonia oxidation reaction

Chan, Yat Tung; Siddharth, Kumar; Shao, Minhua

doi:10.1007/s12274-020-2712-1

Cited by 53 publications

(34 citation statements)

References 58 publications

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“…41,162,163 By introducing a metal that has a high activity towards AOR but a low affinity for N, with a metal that has a low activity but a high affinity for N, a synergistic effect is present. 155,157,158,164 Many experimental findings have demonstrated both improved AOR activity and material stability of Ni-based catalysts on introduction of another metallic species to form an alloy. Such active materials for AOR can be used as anodic components for AMFCs.…”

Section: Choice Of Anode and Cathode Electrocatalysts For Ammonia-fedmentioning

confidence: 99%

Recent progress in ammonia fuel cells and their potential applications

2021

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Section: Choice Of Anode and Cathode Electrocatalysts For Ammonia-fedmentioning

confidence: 99%

Recent progress in ammonia fuel cells and their potential applications

2021

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“…Feliu has studied Pt for this reaction and found that it is structure sensitive where Pt(100) sites are more active than (111) or (110) sites [3c] . It has also been shown that Pt−Ni nanocubes are more active than Pt nanocubes [45] in terms of current density but not onset potential. This is due to Ni favouring OH adsorption which is normally a competing reaction at Pt that blocks the active sites for NH 3 adsorption.…”

Section: Resultsmentioning

confidence: 99%

Electrochemical Synthesis of a Multipurpose Pt−Ni Catalyst for Renewable Energy‐Related Electrocatalytic Reactions

et al. 2020

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Renewable energy driven electrochemical processes are becoming increasingly important in the transition away from fossil fuels. One of the key reactions is electrochemical water splitting to generate green hydrogen which ideally could be directly integrated with a wind or solar electricity source. However, alkaline electrolysers suffer from significant degradation in performance if they are rapidly powered down under reduced sunlight conditions when directly coupled with a solar cell due to reverse current flow. In this work we address this issue by creating a truly bifunctional electrode material that is switchable between the hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER). The synthesis method is simple whereby a Pt electrode is electrochemically activated and then immersed in a nickel nitrate solution to electrolessly deposit Ni on the surface. When this electrode is electrochemically cycled, it creates an active PtÀ Ni alloy at the Pt surface. Importantly, this electrocatalyst is switchable between both reactions without loss of activity as evidenced by an accelerated stress test over a 24 h period. An added advantage is that this PtÀ Ni electrocatalyst is also more active than Pt for the oxygen reduction reaction which opens up its applicability in fuel cells. Finally, to demonstrate the multifunctionality of this PtÀ Ni material, ethanol and ammonia oxidation is demonstrated which also shows better performance than Pt.

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“…More significantly, we found that, with the addition of Ni to the PtIr surface and/or subsurface, the group d‐orbital of the density of states shifts up in energy, strengthening the adsorption of *NH intermediates and subsequently enhancing AOR activity. Beyond Pt‐Ir alloys, other PtM alloys (e.g., M = Ru, Rh, and Pd) [ 266,267 ] also exhibited increased AOR activity compared to Pt, but the relevant mechanisms are not yet precise. For the AOR, an ideal half‐reaction in alkaline solution would result in 3e − per N atom and produce only N 2 .…”

Section: The Aor For Direct Ammonia Fuel Cellsmentioning

confidence: 99%

Advanced Electrocatalysis for Energy and Environmental Sustainability via Water and Nitrogen Reactions

et al. 2020

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Clean and efficient energy storage and conversion via sustainable water and nitrogen reactions have attracted substantial attention to address the energy and environmental issues due to the overwhelming use of fossil fuels. These electrochemical reactions are crucial for desirable clean energy technologies, including advanced water electrolyzers, hydrogen fuel cells, and ammonia electrosynthesis and utilization. Their sluggish reaction kinetics lead to inefficient energy conversion. Innovative electrocatalysis, i.e., catalysis at the interface between the electrode and electrolyte to facilitate charge transfer and mass transport, plays a vital role in boosting energy conversion efficiency and providing sufficient performance and durability for these energy technologies. Herein, a comprehensive review on recent progress, achievements, and remaining challenges for these electrocatalysis processes related to water (i.e., oxygen evolution reaction, OER, and oxygen reduction reaction, ORR) and nitrogen (i.e., nitrogen reduction reaction, NRR, for ammonia synthesis and ammonia oxidation reaction, AOR, for energy utilization) is provided. Catalysts, electrolytes, and interfaces between the two within electrodes for these electrocatalysis processes are discussed. The primary emphasis is device performance of OER‐related proton exchange membrane (PEM) electrolyzers, ORR‐related PEM fuel cells, NRR‐driven ammonia electrosynthesis from water and nitrogen, and AOR‐related direct ammonia fuel cells.

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Investigation of cubic Pt alloys for ammonia oxidation reaction

Cited by 53 publications

References 58 publications

Recent progress in ammonia fuel cells and their potential applications

Recent progress in ammonia fuel cells and their potential applications

Electrochemical Synthesis of a Multipurpose Pt−Ni Catalyst for Renewable Energy‐Related Electrocatalytic Reactions

Advanced Electrocatalysis for Energy and Environmental Sustainability via Water and Nitrogen Reactions

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