Multi-component (Ag–Au–Cu–Pd–Pt) alloy nanoparticle-decorated p-type 2D-molybdenum disulfide (MoS2) for enhanced hydrogen sensing

Creative approaches towards the fabrication of metal nanomaterials for catalysis are highly demanded. In this context, integrating multiple elements into single nanosized alloys opens up a new route for tailoring catalytic performance. Particularly, nanosized high‐entropy alloys (HEAs) with five or more metallic components have emerged as a new platform for catalyst discovery in broad cases, such as ammonia decomposition, ammonia oxidation, and various electrochemical reactions. In this minireview, the vigorous current activity on the synthesis of HEAs nanoparticles (NPs) and their catalytic applications have been summarized. Theoretically, the rational design of heterogeneous HEAs catalysts has also been briefly discussed.

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“…HEA has been explored in various electrochemical activities as CO2 reduction 23 , for OER 6 , for HER 24 (hydrogen evolution reaction) due to its unique properties 25 . Our previous studies have found AgAuPtPdCu alloys having exceptional electrochemical catalyst properties [26][27][28] .…”

Section: Introductionmentioning

confidence: 95%

Low Cost, Easy Scalable High Entropy Alloy (HEA) FeCoNiZnGa for High-Efficiency Oxygen Evolution Reaction (OER)

Sharma¹,

Kumar²,

R³

et al. 2020

Preprint

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Oxygen evolution reaction (OER) is the key step involved both in water splitting devices as well as in rechargeable metal-air batteries and there is an urgent requirement for a highly stable and low-cost material for efficient OER. In this article, for the first time, electrocatalyst based on high entropy alloy (HEA) of FeCoNiZnGa has been reported for OER. Nano-crystalline high entropy alloys materials withdrew the attention of the research academia due to their emerging unique properties due to the cocktail effect and synergetic effect between the constituent elements. The existing materials (IrO2, RuO2, etc.) being utilized in the OER reaction contain precious metals. Thus, high entropy alloy made up of low-cost elements has been formulated and tested for the OER, which is found to be highly stable and more efficient. The formulation of nanocrystalline HEA (FeCoNiZnGa) utilized a unique recipe casting-cum-comminution (CCC). After electrochemical CV activation, transition metal oxides formation at the HEA surface helps in OER activities. HEA exhibits a low overpotential of 370 mV to achieve a current density of 10 mA cm-2 with a very small Tafel slope of 71 mV dec-1 and exceptional long term stability of electrolysis for over 10 h in 1 M KOH alkaline solution, which is extremely stable in comparison to the state-of-the-art OER electrocatalyst RuO2. Transmission electron microscopic (TEM) studies after 10 h of long term chronoamperometry testing confirmed high stability of HEA as no change in the crystal structure observed. Our work highlights the great potential of HEA towards oxygen evolution reaction which is primary reaction involved in water splitting.

show abstract

“…Till now, HEA has been explored in various electrochemical activities as CO2 reduction 23 , for OER 6 , for HER 24 (hydrogen evolution reaction) due to its unique properties 25 . Our previous studies have found AgAuPtPdCu alloys having exceptional electrochemical catalyst properties [26][27][28] .…”

Section: Introductionmentioning

confidence: 95%

Low Cost, Easy Scalable High Entropy Alloy (HEA) FeCoNiZnGa for High-Efficiency Oxygen Evolution Reaction (OER)

Sharma¹,

Kumar²,

Das³

et al. 2020

Preprint

Self Cite

1

0

View full text Add to dashboard Cite

Oxygen evolution reaction (OER) is the key step involved both in water splitting devices as well as in rechargeable metal-air batteries and there is an urgent requirement for a highly stable and low-cost material for efficient OER. In this article, for the first time, electrocatalyst based on high entropy alloy (HEA) of FeCoNiZnGa has been reported for OER. Nano-crystalline high entropy alloys materials withdrew the attention of the research academia due to their emerging unique properties due to the cocktail effect and synergetic effect between the constituent elements. The existing materials (IrO2, RuO2, etc.) being utilized in the OER reaction contain precious metals. Thus, high entropy alloy made up of low-cost elements has been formulated and tested for the OER, which is found to be highly stable and more efficient. The formulation of nanocrystalline HEA (FeCoNiZnGa) utilized a unique recipe casting-cum-comminution (CCC). After electrochemical CV activation, transition metal oxides formation at the HEA surface helps in OER activities. HEA exhibits a low overpotential of 370 mV to achieve a current density of 10 mA cm-2 with a very small Tafel slope of 71 mV dec-1 and exceptional long term stability of electrolysis for over 10 h in 1 M KOH alkaline solution, which is extremely stable in comparison to the state-of-the-art OER electrocatalyst RuO2. Transmission electron microscopic (TEM) studies after 10 h of long term chronoamperometry testing confirmed high stability of HEA as no change in the crystal structure observed. Our work highlights the great potential of HEA towards oxygen evolution reaction which is primary reaction involved in water splitting.

show abstract

Multi-component (Ag–Au–Cu–Pd–Pt) alloy nanoparticle-decorated p-type 2D-molybdenum disulfide (MoS₂) for enhanced hydrogen sensing

Abstract: The nanoscale interface between multi-component (Ag–Au–Cu–Pd–Pt) alloy nanoparticles on MoS2 sheets increase its work function making an ohmic contact into Schottky with gold electrodes. This drastically enhances response towards hydrogen gas.

Cited by 48 publications

References 46 publications

The Synthesis and Catalytic Applications of Nanosized High‐Entropy Alloys

The Synthesis and Catalytic Applications of Nanosized High‐Entropy Alloys

Low Cost, Easy Scalable High Entropy Alloy (HEA) FeCoNiZnGa for High-Efficiency Oxygen Evolution Reaction (OER)

Low Cost, Easy Scalable High Entropy Alloy (HEA) FeCoNiZnGa for High-Efficiency Oxygen Evolution Reaction (OER)

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