Low-cost high entropy alloy (HEA) for high-efficiency oxygen evolution reaction (OER)

Nano Research ◽  
2021 ◽  
Author(s):  
Lalita Sharma ◽  
Nirmal Kumar Katiyar ◽  
Arko Parui ◽  
Rakesh Das ◽  
Ritesh Kumar ◽  
...  
Keyword(s):  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
High Efficiency ◽  
Low Cost ◽  
High Entropy Alloy ◽  
High Entropy

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

2020 ◽  
Author(s):  
Lalita Sharma ◽  
Nirmal Kumar ◽  
Rakesh Das ◽  
Khushu Tiwari ◽  
Chandra Sekhar Tiwary ◽  
...  
Keyword(s):  
Water Splitting ◽  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
High Efficiency ◽  
Low Cost ◽  
Synergetic Effect ◽  
High Entropy Alloy ◽  
Electron Microscopic ◽  
High Entropy

<p>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 (IrO<sub>2</sub>, RuO<sub>2</sub>, 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<sup>-2</sup> with a very small Tafel slope of 71 mV dec<sup>-1</sup> 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 RuO<sub>2</sub>. 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.</p>

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

2020 ◽  
Author(s):  
Lalita Sharma ◽  
Nirmal Kumar ◽  
Rakesh Das ◽  
Khushu Tiwari ◽  
Chandra Sekhar Tiwary ◽  
...  
Keyword(s):  
Water Splitting ◽  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
High Efficiency ◽  
Low Cost ◽  
Synergetic Effect ◽  
High Entropy Alloy ◽  
Electron Microscopic ◽  
High Entropy

<p>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 (IrO<sub>2</sub>, RuO<sub>2</sub>, 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<sup>-2</sup> with a very small Tafel slope of 71 mV dec<sup>-1</sup> 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 RuO<sub>2</sub>. 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.</p>

Constructing oxygen vacancy-enriched Fe2O3@NiO heterojunctions for highly efficient electrocatalytic alkaline water splitting

CrystEngComm ◽  
2021 ◽  
Author(s):  
Yan Sang ◽  
Xi Cao ◽  
Gaofei Ding ◽  
Zixuan Guo ◽  
Yingying Xue ◽  
...  
Keyword(s):  
Oxygen Vacancy ◽  
Water Splitting ◽  
Oxygen Evolution ◽  
High Purity ◽  
Oxygen Evolution Reaction ◽  
High Efficiency ◽  
Low Cost ◽  
Dual Function ◽  
Alkaline Water ◽  
High Purity Hydrogen

Electrolysis of water to produce high-purity hydrogen is a very promising method. The development of green, high-efficiency, long-lasting and low-cost dual function electrocatalysts for oxygen evolution reaction (OER) and hydrogen...

scholarly journals Hydroxylated high-entropy alloy as highly efficient catalyst for electrochemical oxygen evolution reaction

2020 ◽  
Vol 63 (12) ◽  
pp. 2613-2619
Author(s):  
Peiyan Ma ◽  
Shichao Zhang ◽  
Mutian Zhang ◽  
Junfeng Gu ◽  
Long Zhang ◽  
...  
Keyword(s):  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
High Entropy Alloy ◽  
Efficient Catalyst ◽  
High Entropy ◽  
Highly Efficient ◽  
Electrochemical Oxygen

scholarly journals High intrinsic activity of the oxygen evolution reaction in low-cost NiO nanowall electrocatalysts

2020 ◽  
Vol 1 (6) ◽  
pp. 1971-1979
Author(s):  
Salvatore Cosentino ◽  
Mario Urso ◽  
Giacomo Torrisi ◽  
Sergio Battiato ◽  
Francesco Priolo ◽  
...  
Keyword(s):  
Oxygen Evolution ◽  
Thermal Annealing ◽  
Chemical Bath Deposition ◽  
Oxygen Evolution Reaction ◽  
High Efficiency ◽  
Low Cost ◽  
Intrinsic Activity

NiO nanowalls grown by low-cost chemical bath deposition and thermal annealing are a high-efficiency and sustainable electrocatalytst for OER.

Unique nanosheet–nanowire structured CoMnFe layered triple hydroxide arrays as self-supporting electrodes for a high-efficiency oxygen evolution reaction

2019 ◽  
Vol 7 (21) ◽  
pp. 13130-13141 ◽  
Author(s):  
Meichen Guo ◽  
Lingxi Zhou ◽  
Yao Li ◽  
Qiaoji Zheng ◽  
Fengyu Xie ◽  
...  
Keyword(s):  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
High Efficiency ◽  
Low Cost ◽  
Highly Active

Developing highly active and low-cost electrocatalysts for the oxygen evolution reaction (OER) to meet industrial criteria is vitally essential.

High entropy alloy/C nanoparticles derived from polymetallic MOF as promising electrocatalysts for alkaline oxygen evolution reaction

2022 ◽  
Vol 429 ◽  
pp. 132410
Author(s):  
Shiqi Wang ◽  
Wenyi Huo ◽  
Feng Fang ◽  
Zonghan Xie ◽  
Jian Ku Shang ◽  
...  
Keyword(s):  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
High Entropy Alloy ◽  
High Entropy

A novel phosphide derived from metal-organic frameworks as cost-effective electrocatalyst for oxygen evolution reaction

2021 ◽  
pp. 1-19
Author(s):  
Yi-Wen Yang ◽  
Bing-Ye Song
Keyword(s):  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
High Efficiency ◽  
Low Cost ◽  
Metal Organic Frameworks ◽  
Carbon Matrix ◽  
Metal Catalyst ◽  
Ni Doping ◽  
Positive Effects ◽  
Metal Organic

Abstract Developing an efficient, green and low-cost non noble metal catalyst towards oxygen evolution reaction (OER) has been urgent for new generation of sustainable energy technologies. Herein, the Co/Ni metal-organic frameworks (MOFs) derived metal phosphides/ carbon matrix composites are successfully produced by the precipitation-carbonization-phosphorization processes. The obtained samples are characterized and analyzed for structural and morphological investigation. Electrochemical tests for OER are performed in alkaline medium. The positive effects of P, Ni doping in MOFs on the structure and properties of composites have been analyzed. Benefitting from the unique structure of three-dimensional flower-like polyhedron with rich structure and higher porosity, the NiCo-P/NC catalyst exhibits the lowest overpotential of 0.32 V compared with the commercial IrO2 (0.34V) at 10 mA cm−2, as well as outstanding stability and kinetic mechanism. Besides, the cost of the proposed novel material is calculated to be 4.337 US$/g, which is only 1.57 % of that of commercial IrO2 (276 US$/g). The results obtained from the MOF-derived low-cost and high-efficiency OER catalyst would provide a new perspective on application of electrochemical storage and batteries.

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