Structural Transformation between Rutile and Spinel Crystal Lattices in Ru-Co Binary Oxide Nanotubes: Enhanced Electron Transfer Kinetics for Oxygen Evolution Reaction

Nanoscale ◽  
2021 ◽  
Author(s):  
Areum Yu ◽  
Myung Hwa Kim ◽  
Chongmok Lee ◽  
Youngmi Lee
Keyword(s):  
Electron Transfer ◽  
Oxygen Evolution ◽  
Structural Transformation ◽  
Mixed Oxide ◽  
Oxygen Evolution Reaction ◽  
Binary Oxide ◽  
Spinel Crystal ◽  
Electron Transfer Kinetics ◽  
Crystal Lattices ◽  
Subsequent Calcination

A variety of binary Ru-Co mixed oxide nanotubes (RuxCo1−xOy with x = 0.19, 0.33, 0.47, 0.64 and 0.77) were readily synthesized via electrospinning and subsequent calcination. RuxCo1−xOy nanotubes (0 <...

The electron-transfer intermediates of the oxygen evolution reaction (OER) as polarons by in situ spectroscopy

2021 ◽  
Author(s):  
Hanna Lyle ◽  
Suryansh Singh ◽  
Michael Paolino ◽  
Ilya Vinogradov ◽  
Tanja Cuk
Keyword(s):  
Electron Transfer ◽  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Catalytic Reactions ◽  
In Situ Spectroscopy ◽  
Chemical Bonds

The conversion of diffusive forms of energy (electrical and light) into short, compact chemical bonds by catalytic reactions regularly involves moving a carrier from an environment that favors delocalization to one that favors localization.

Revealing the structural transformation of rutile RuO2via in situ X-ray absorption spectroscopy during the oxygen evolution reaction

2019 ◽  
Vol 48 (21) ◽  
pp. 7122-7129 ◽  
Author(s):  
Chia-Jui Chang ◽  
You-Chiuan Chu ◽  
Hao-Yu Yan ◽  
Yen-Fa Liao ◽  
Hao Ming Chen
Keyword(s):  
Oxygen Evolution ◽  
Structural Transformation ◽  
Absorption Spectroscopy ◽  
Oxygen Evolution Reaction ◽  
The State ◽  
X Ray ◽  
Alkaline Conditions ◽  
X Ray Absorption ◽  
State Of Art

The state-of-art RuO2 catalyst for the oxygen evolution reaction (OER) is measured by using in situ X-ray absorption spectroscopy (XAS) to elucidate the structural transformation during catalyzing the reaction in acidic and alkaline conditions.

Increased activity in the oxygen evolution reaction by Fe4+-induced hole states in perovskite La1−xSrxFeO3

2020 ◽  
Vol 8 (8) ◽  
pp. 4407-4415 ◽  
Author(s):  
Zechao Shen ◽  
Yongbin Zhuang ◽  
Weiwei Li ◽  
Xiaochun Huang ◽  
Freddy E. Oropeza ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Energy Barrier ◽  
Hole State ◽  
Reaction Intermediates ◽  
Increased Activity

Hole for faster OER: The hole state induced by Fe4+ promotes the OER process. It reduces the energy barrier for electron transfer at the interface and facilitates a faster electron transfer from reaction intermediates to the catalyst.

On the oxygen evolution reaction at IrO 2 -SnO 2 mixed-oxide electrodes

2014 ◽  
Vol 146 ◽  
pp. 257-261 ◽  
Author(s):  
Sergio Ferro ◽  
Davide Rosestolato ◽  
Carlos Alberto Martínez-Huitle ◽  
Achille De Battisti
Keyword(s):  
Oxygen Evolution ◽  
Mixed Oxide ◽  
Oxygen Evolution Reaction ◽  
Oxide Electrodes ◽  
Mixed Oxide Electrodes

scholarly journals Spin-Polarized Oxygen Evolution Reaction Under Magnetic Field

2021 ◽  
Author(s):  
Xiao Ren ◽  
Tianze Wu ◽  
Yuanmiao Sun ◽  
Yan Li ◽  
Guoyu Xian ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Electron Transfer ◽  
Triplet State ◽  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Spin Exchange ◽  
Momentum Conservation ◽  
Exclusion Principle ◽  
Fast Kinetics ◽  
Spin Polarized

<p><a></a><a>The oxygen evolution reaction (OER) is the bottleneck that limits the energy efficiency of water-splitting. The process involves four electrons’ transfer and the generation of triplet state O<sub>2</sub> from singlet state species (OH<sup>- </sup>or H<sub>2</sub>O). Recently, explicit spin selection was described as a possible way to promote OER in alkaline conditions, but the specific spin-polarized kinetics remains unclear. </a><a></a><a>Here, we report that </a><a>by using ferromagnetic ordered catalysts as the spin polarizer for spin selection under </a><a></a><a>a constant magnetic field</a>, <a>the OER can be enhanced.</a> However, it does not applicable to non-ferromagnetic catalysts. We found that the spin <a>polarization occurs at the first electron transfer step in OER</a>, where <a></a><a>coherent spin exchange happens </a>between the <a></a><a>ferromagnetic</a> catalyst and the adsorbed oxygen species <a>with fast kinetics</a>, under the principle of spin angular momentum conservation. In the next three electron transfer steps, as the adsorbed O species adopt fixed spin direction, the OER electrons need to follow the Hund rule and Pauling exclusion principle, thus to carry out spin polarization spontaneously and finally lead to the generation of triplet state O<sub>2</sub>. Here, we showcase spin-polarized kinetics of oxygen evolution reaction, which gives references in the understanding and design of spin-dependent catalysts.</p>

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