Efficient Electrocatalytic Overall Water Splitting on a Cu-Based High Entropy Alloy: An Electrochemical Study

2021 ◽  
Author(s):  
Behnam Nourmohammadi Khiarak ◽  
Kaveh Shariati ◽  
Majdoddin Mojaddami ◽  
Zahra Zamani ◽  
Angelina Olegovna Zekiy ◽  
...  
Keyword(s):  
Water Splitting ◽  
Electrochemical Study ◽  
High Entropy Alloy ◽  
High Entropy ◽  
Overall Water Splitting

Preparation, Electrical and Electrochemical Characterizations of CuCoNiFeMn High-Entropy-Alloy for Overall Water Splitting at Neutral-pH

2021 ◽  
Author(s):  
Sivanantham Arumugam ◽  
Hansung Lee ◽  
Sung Won Hwang ◽  
Byungmin Ahn ◽  
In Sun Cho
Keyword(s):  
Water Splitting ◽  
Active Sites ◽  
Surface Composition ◽  
Electrochemical Characterizations ◽  
High Entropy Alloy ◽  
High Entropy Alloys ◽  
Equiatomic Composition ◽  
High Entropy ◽  
Neutral Ph ◽  
Overall Water Splitting

High entropy alloys (HEA), the multicomponent (5 or more) alloys with an equiatomic or a near equiatomic composition, provide a unique platform to engineer surface composition and active sites for...

Nanoporous Al‐Ni‐Co‐Ir‐Mo High‐Entropy Alloy for Record‐High Water Splitting Activity in Acidic Environments

Small ◽  
2019 ◽  
Vol 15 (47) ◽  
pp. 1904180 ◽  
Author(s):  
Zeyu Jin ◽  
Juan Lv ◽  
Henglei Jia ◽  
Weihong Liu ◽  
Huanglong Li ◽  
...  
Keyword(s):  
Water Splitting ◽  
High Water ◽  
High Entropy Alloy ◽  
High Entropy ◽  
Acidic Environments

Exploring the impact of atomic lattice deformation on oxygen evolution reactions based on a sub-5 nm pure face-centred cubic high-entropy alloy electrocatalyst

2020 ◽  
Vol 8 (24) ◽  
pp. 11938-11947 ◽  
Author(s):  
Kang Huang ◽  
Bowei Zhang ◽  
Junsheng Wu ◽  
Tianyuan Zhang ◽  
Dongdong Peng ◽  
...  
Keyword(s):  
Metal Oxides ◽  
Water Splitting ◽  
Oxygen Evolution ◽  
Noble Metals ◽  
High Entropy Alloy ◽  
Lattice Deformation ◽  
High Entropy Alloys ◽  
Atomic Lattice ◽  
High Entropy ◽  
The Impact

Multimetal high-entropy alloys (HEAs) have been recognized as potential catalysts that can possibly replace the conventional metal oxides and noble metals for use in energy conversion and water splitting such as oxygen evolution reactions (OERs).

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>

High-Entropy Effect of Metal Phosphide on Enhanced Overall Water Splitting Performance

2021 ◽  
Author(s):  
Dawei Lai ◽  
Qiaoling Kang ◽  
Feng Gao ◽  
Qingyi Lu
Keyword(s):  
Water Splitting ◽  
Structural Characteristics ◽  
Metal Phosphide ◽  
High Entropy ◽  
Overall Water Splitting ◽  
Metal Phosphides ◽  
Entropy Effect

High-entropy materials has gained extensive attention owing to their unique structural characteristics and outstanding properties. The synthesis of high-entropy compounds, especially high-entropy metal phosphides have been seldom reported because of...

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 Electrochemical Study of MoTaNbVTi High Entropy Alloy in Aqueous Environments

2019 ◽  
Vol 43 (4) ◽  
pp. 199-205
Author(s):  
Anthoula Poulia ◽  
Christina Mathiou ◽  
Alexander Karantzalis
Keyword(s):  
Electrochemical Study ◽  
High Entropy Alloy ◽  
High Entropy ◽  
Aqueous Environments

A novel ligand with –NH2 and –COOH-decorated Co/Fe-based oxide for an efficient overall water splitting: dual modulation roles of active sites and local electronic structure

2020 ◽  
Vol 10 (18) ◽  
pp. 6266-6273
Author(s):  
Yalan Zhang ◽  
Zebin Yu ◽  
Ronghua Jiang ◽  
Jung Huang ◽  
Yanping Hou ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Water Splitting ◽  
Energy Demand ◽  
Active Sites ◽  
Electrode Materials ◽  
Global Energy ◽  
Overall Water Splitting ◽  
Local Electronic Structure ◽  
Electrochemical Water Splitting

Excellent electrochemical water splitting with remarkable durability can provide a solution to satisfy the increasing global energy demand in which the electrode materials play an important role.

Interlayer confinement synthesis of Ir nanodots/dual carbon as an electrocatalyst for overall water splitting

2020 ◽  
Author(s):  
Yaru Li ◽  
Yu-Quan Zhu ◽  
Weili Xin ◽  
Song Hong ◽  
Xiaoying Zhao ◽  
...  
Keyword(s):  
Water Splitting ◽  
Noble Metal ◽  
High Efficiency ◽  
Overall Water Splitting ◽  
Highly Dispersed

Rationally designing low-content and high-efficiency noble metal nanodots offers opportunities to enhance electrocatalytic performances for water splitting. However, the preparation of highly dispersed nanodots electrocatalysts remains a challenge. Herein, we...

Instant and Persistent Hydrogen Production Using Nano High Entropy Catalyst

2019 ◽  
Author(s):  
Nirmal Kumar ◽  
Subramanian Nellaiappan ◽  
Ritesh Kumar ◽  
Kirtiman Deo Malviya ◽  
K. G. Pradeep ◽  
...  
Keyword(s):  
Formic Acid ◽  
Minimum Energy ◽  
High Entropy Alloy ◽  
Hydrogen Energy ◽  
High Entropy ◽  
Electro Oxidation ◽  
The Individual ◽  
Novel Catalyst ◽  
Cell Anode ◽  
Fuel Cell Anode

<div>Renewable harvesting clean and hydrogen energy using the benefits of novel multicatalytic materials of high entropy alloy (HEA equimolar Cu-Ag-Au-Pt-Pd) from formic acid with minimum energy input has been achieved in the present investigation. The synthesis effect of pristine elements in the HEA drives the electro-oxidation reaction towards non-carbonaceous pathway . The atomistic simulation based on DFT rationalize the distinct lowering of the d-band center for the individual atoms in the HEA as compared to the pristine counterparts. This catalytic activity of the HEA has also been extended to methanol electro-oxidation to show the unique capability of the novel catalyst. The nanostructured HEA, properties using a combination of casting and cry omilling techniques can further be utilized as fuel cell anode in direct formic acid/methanol fuel cells (DFFE).<br></div>

Sign in / Sign up

Export Citation Format

Share Document