Surface Phase Engineering Modulated Iron‐Nickel Nitrides/Alloy Nanospheres with Tailored d‐Band Center for Efficient Oxygen Evolution Reaction

Small ◽  
2021 ◽  
pp. 2105696
Author(s):  
Qiming Chen ◽  
Ning Gong ◽  
Tanrui Zhu ◽  
Changyu Yang ◽  
Wenchao Peng ◽  
...  
Keyword(s):  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Surface Phase ◽  
Band Center ◽  
Iron Nickel ◽  
Phase Engineering

scholarly journals Iron-Nickel Oxyhydroxide Catalyst from Watts Bath for the Oxygen Evolution Reaction in Water Electrolysis

2020 ◽  
Author(s):  
Dario Delgado ◽  
Jan Bucher
Keyword(s):  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Fossil Fuels ◽  
Electrochemical Impedance ◽  
Electrochemical Techniques ◽  
Water Electrolysis ◽  
Cost Effective ◽  
Catalyst Characterization ◽  
Iron Nickel ◽  
Nickel Oxyhydroxide

A hydrogen economy is necessary to meet the social demands for less consumption of fossil fuels and it has several barriers that need to be addressed if this technology is to become cost effective. The oxygen evolution reaction (OER) is one of these barriers and catalysts based on nickel oxyhydroxide (NiOx) are believed to be promising for alkaline OER. We report results of iron doping for NiOx, we synthesized by electrodeposition, combinations of iron in Ni Watts solution to develop Fe- NiOx catalysts. The best sample has an overpotential of 254 mV at 10 mA cm-2 , this result is competitive to the best results found for alkaline OER. Our methodology consists of: linear and cyclic voltammetry, galvanostatic stability and electrochemical impedance spectroscopy as electrochemical techniques. In addition, physical catalyst characterization techniques include: scanning electron microscopy equipped with energy-dispersive X-ray spectroscopy, Raman spectroscopy and surface elemental analysis by wet chemistry.<br>

scholarly journals Bismuth Substituted Strontium Cobalt Perovskites for Catalyzing Oxygen Evolution

2019 ◽  
Author(s):  
Denis Kuznetsov ◽  
Jiayu Peng ◽  
Livia Giordano ◽  
Yuriy Román-Leshkov ◽  
Yang Shao-Horn
Keyword(s):  
Fermi Level ◽  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Rational Design ◽  
High Stability ◽  
Inductive Effect ◽  
Specific Activity ◽  
Band Center ◽  
Highly Active ◽  
A Site

In this study, we employ the strategy of substitution with more electronegative/acidic A-site ions in the cobalt perovskites to alter O 2p-band center, surface hydroxide affinity, and oxygen evolution reaction (OER) activity and stability in the basic electrolyte. Galvanostatically charged Bi<sub>0.2</sub>Sr<sub>0.8</sub>CoO<sub>3-δ</sub> (δ close to zero) was shown to exhibit record OER specific activity exceeding not only La<sub>x</sub>Sr<sub>1-x</sub>CoO<sub>3-δ</sub> but also charged SrCoO<sub>3-δ</sub> (δ close to zero), one of the most active oxide OER catalysts reported so far. The enhanced OER activity of charged Bi<sub>0.2</sub>Sr<sub>0.8</sub>CoO<sub>3-δ</sub> can be attributed to greater hydroxide affinity facilitating the deprotonation of surface bound intermediates due to the presence of strong Lewis acidic A-site Bi<sup>3+</sup> ions, while the high stability can result from lowered O 2p-band center relative to the Fermi level. This work provides a novel example in the rational design of highly active oxide catalysts for OER by leveraging the inductive effect.

Rapid mass production of iron nickel oxalate nanorods for efficient oxygen evolution reaction catalysis

2021 ◽  
Author(s):  
Huixia Hu ◽  
xiang lei ◽  
Shumei Li ◽  
Ruzhen PENG ◽  
Jinliang Wang
Keyword(s):  
Catalytic Activity ◽  
Hydrogen Production ◽  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Mass Production ◽  
Metal Organic Framework ◽  
Iron Nickel ◽  
Metal Organic ◽  
Double Hydroxide ◽  
Rapid Mass

NiFe layered-double-hydroxide (NiFe-LDH) and the NiFe metal–organic framework (NiFe-MOF) demonstrates the best catalytic activity among NiFe-based materials for the oxygen evolution reaction (OER), which is important for efficient hydrogen production....

Phase and Morphology Engineering of Porous Cobalt-Copper Sulfide as Bifunctional Oxygen Electrode for Rechargeable Zn-Air Battery

2021 ◽  
Author(s):  
Linzhou Zhuang ◽  
Haolan Tao ◽  
Fang Xu ◽  
Cheng Lian ◽  
Honglai Liu ◽  
...  
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Copper Sulfide ◽  
Oxygen Electrode ◽  
Reduction Reaction ◽  
Energy Devices ◽  
Morphology Engineering ◽  
Air Battery ◽  
Phase Engineering

Developing efficient electrocatalysts for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) is crucial for various sustainable energy devices like rechargeable Zn-air batteries. Phase engineering has been proven to...

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