scholarly journals Perovskite With Tunable Active-Sites Oxidation State by High-Valence W for Enhanced Oxygen Evolution Reaction

2022 ◽  
Vol 9 ◽  
Author(s):  
Jiabiao Yan ◽  
Mingkun Xia ◽  
Chenguang Zhu ◽  
Dawei Chen ◽  
Fanglin Du
Keyword(s):  
Electronic Structure ◽  
Water Splitting ◽  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Precious Metal ◽  
Active Sites ◽  
Perovskite Oxides ◽  
Intrinsic Activity ◽  
Excellent Activity ◽  
The Stability

Perovskite oxides have been established as a promising kind of catalyst for alkaline oxygen evolution reactions (OER), because of their regulated non-precious metal components. However, the surface lattice is amorphous during the reaction, which gradually decreases the intrinsic activity and stability of catalysts. Herein, the precisely control tungsten atoms substituted perovskite oxides (Pr0.5Ba0.5Co1-xWxO3-δ) nanowires were developed by electrostatic spinning. The activity and Tafel slope were both dependent on the W content in a volcano-like fashion, and the optimized Pr0.5Ba0.5Co0.8W0.2O3-δ exhibits both excellent activity and superior stability compared with other reported perovskite oxides. Due to the outermost vacant orbitals of W6+, the electronic structure of cobalt sites could be efficiently optimized. Meanwhile, the stronger W-O bond could also significantly improve the stability of latticed oxide atoms to impede the generation of surface amorphous layers, which shows good application value in alkaline water splitting.

Cathodic Corrosion Activated Fe-based Nanoglass as Highly-Active and -Stable Oxygen Evolution Catalyst for Water Splitting

2021 ◽  
Author(s):  
Kaiyao Wu ◽  
Fei Chu ◽  
Yuying Meng ◽  
Kaveh Edalati ◽  
Qingsheng Gao ◽  
...  
Keyword(s):  
Water Splitting ◽  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Amorphous Alloys ◽  
Precious Metal ◽  
Active Sites ◽  
Metal Free ◽  
Highly Active ◽  
Stable Oxygen ◽  
Surface Active

Transition metal-based amorphous alloys have attracted increasing attention as precious-metal-free electrocatalysts for oxygen evolution reaction (OER) of water splitting due to their high macro-conductivity and abundant surface active sites. However,...

scholarly journals Intrinsic activity modulation and structural design of NiFe alloy catalysts for an efficient oxygen evolution reaction

2021 ◽  
Author(s):  
Qiaoling Kang ◽  
Dawei Lai ◽  
Wenyin Tang ◽  
Qingyi Lu ◽  
Feng Gao
Keyword(s):  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Structural Design ◽  
Active Sites ◽  
Intrinsic Activity ◽  
Effective Strategies ◽  
Alloy Catalysts

Effective strategies to increase the intrinsic activity by electronic modulation and to increase the number of active sites by structural design are discussed for improving the oxygen evolution activities of NiFe alloys.

Tuning the electronic structure of NiCoVOx nanosheets through S doping for enhanced oxygen evolution

Nanoscale ◽  
2021 ◽  
Author(s):  
Haibin Ma ◽  
ChangNing SUN ◽  
Zhili Wang ◽  
Qing Jiang
Keyword(s):  
Electronic Structure ◽  
Water Splitting ◽  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Low Cost ◽  
Ni Foam ◽  
Electrochemical Water Splitting

It is of great importance to develop efficient and low-cost oxygen evolution reaction (OER) electrocatalysts for electrochemical water splitting. Herein, S doped NiCoVOx nanosheets grown on Ni-Foam (S-NiCoVOx/NF) with modified...

scholarly journals Controllable Synthesis of 2D Nonlayered Cr2S3 Nanosheets and Their Electrocatalytic Activity Toward Oxygen Evolution Reaction

2021 ◽  
Vol 3 ◽  
Author(s):  
Tofik Ahmed Shifa ◽  
Raffaello Mazzaro ◽  
Vittorio Morandi ◽  
Alberto Vomiero
Keyword(s):  
Water Splitting ◽  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Active Sites ◽  
Chemical Vapor ◽  
Great Promise ◽  
Fertile Ground ◽  
Earth Abundant ◽  
Controllable Growth ◽  
Current Densities

The design of oxygen evolution reaction (OER) electrocatalysts based on Earth-abundant materials holds great promise for realizing practically viable water-splitting systems. In this regard, two-dimensional (2D) nonlayered materials have received considerable attention in recent years owing to their intrinsic dangling bonds which give rise to the exposure of unsaturated active sites. In this work, we solved the synthesis challenge in the development of a 2D nonlayered Cr2S3 catalyst for OER application via introducing a controllable chemical vapor deposition scheme. The as-obtained catalyst exhibits a very good OER activity requiring overpotentials of only 230 mV and 300 mV to deliver current densities of 10 mA cm−2 and 30 mA cm−2, respectively, with robust stability. This study provides a general approach to optimize the controllable growth of 2D nonlayered material and opens up a fertile ground for studying the various strategies to enhance the water splitting reactions.

Room-temperature synthesis of Ni1−xFex (oxy)hydroxides: structure–activity relationship for the oxygen evolution reaction

2020 ◽  
Vol 4 (2) ◽  
pp. 932-939 ◽  
Author(s):  
Xiaodong Yan ◽  
Qing-Tao Hu ◽  
Wen-Da Zhang ◽  
Tao Li ◽  
Haiyan Zhu ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Phase Structure ◽  
Room Temperature ◽  
Activity Relationship ◽  
Intrinsic Activity ◽  
Temperature Synthesis ◽  
Room Temperature Synthesis ◽  
Structure Activity

It is found that phase structure plays an important role in determining the intrinsic activity of Ni–Fe (oxy)hydroxides and that Fe/Ni ratio affects the phase structure and the electronic structure for optimized performance.

Enhancing hydrogen evolution reaction through modulating electronic structure of self-supported NiFe LDH

2020 ◽  
Vol 10 (13) ◽  
pp. 4184-4190 ◽  
Author(s):  
Xiao-Peng Li ◽  
Wen-Kai Han ◽  
Kang Xiao ◽  
Ting Ouyang ◽  
Nan Li ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Hydrogen Evolution ◽  
Water Splitting ◽  
Oxygen Evolution ◽  
Layered Double Hydroxide ◽  
Hydrogen Evolution Reaction ◽  
Oxygen Evolution Reaction ◽  
Alkaline Electrolyte ◽  
Overall Water Splitting ◽  
Double Hydroxide

NiFe-layered double hydroxide (NiFe LDH), as an efficient oxygen evolution reaction (OER) electrocatalyst, has emerged as a promising electrocatalyst for catalyzing overall water splitting in alkaline electrolyte.

Self-Supported NiCo2O4/CuxO Nanoforest with Electronically Modulated Interfaces as Efficient Electrocatalyst for Overall Water Splitting

2021 ◽  
Author(s):  
Qi Ouyang ◽  
Zuotao Lei ◽  
Qun Li ◽  
Mingyang Li ◽  
Chun-hui Yang
Keyword(s):  
Hydrogen Evolution ◽  
Water Splitting ◽  
Oxygen Evolution ◽  
Alkaline Medium ◽  
Hydrogen Evolution Reaction ◽  
Oxygen Evolution Reaction ◽  
Precious Metal ◽  
Metal Catalysts ◽  
Overall Water Splitting ◽  
Precious Metal Catalysts

Developing non-precious metal catalysts capable of both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in alkaline medium is of great significance to facilitate the electrocatalytic water-splitting industry. Herein,...

scholarly journals Surface reconstruction establishing Mott-Schottky heterojunction and built-in space-charging effect accelerating oxygen evolution reaction

Nano Research ◽  
2021 ◽  
Author(s):  
Yao Kang ◽  
Shuo Wang ◽  
Kwan San Hui ◽  
Shuxing Wu ◽  
Duc Anh Dinh ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Oxygen Evolution ◽  
Surface Reconstruction ◽  
Oxygen Evolution Reaction ◽  
Active Sites ◽  
Density Functional ◽  
Electrochemical Process ◽  
Ex Situ ◽  
Catalytic Activities ◽  
Spectroscopy Studies

AbstractStructural reconstruction of nanomaterials offers a fantastic way to regulate the electronic structure of active sites and promote their catalytic activities. However, how to properly facilitate surface reconstruction to overcome large overpotential that stimulate the surface reconstruction has remained elusive. Herein, we adopt a facile approach to activate surface reconstruction on Ni(OH)2 by incorporating F anions to achieve electro-derived structural oxidation process and further boost its oxygen evolution reaction (OER) activity. Ex situ Raman and X-ray photoemission spectroscopy studies indicate that F ions incorporation facilitated surface reconstruction and promotes the original Ni(OH)2 transformed into a mesoporous and amorphous F-NiOOH layer during the electrochemical process. Density functional theory (DFT) calculation reveals that this self-reconstructed NiOOH induces a space-charge effect on the p-n junction interface, which not only promotes the absorption of intermediates species (*OH, *O, and *OOH) and charge-transfer process during catalysis, but also leads to a strong interaction of the p-n junction interface to stabilize the materials. This work opens up a new possibility to regulate the electronic structure of active sites and promote their catalytic activities.

Polyaniline Coating Enables Electronic Structure Engineering in Fe3O4 to Promote Alkaline Oxygen Evolution Reaction

2021 ◽  
Author(s):  
Yang Zou ◽  
Yuan Huang ◽  
Liwen Jiang ◽  
Arindam Indra ◽  
Yongqing Wang ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Active Sites ◽  
Simple Process ◽  
Molecular Modification ◽  
Mild Conditions ◽  
Novel Strategy ◽  
Structure Engineering

Abstract The electronic structure of active sites is of importance for catalysts to achieve an optimized interaction with the intermediates. In this study, a unique organic-inorganic hybrid oxygen evolution reaction (OER) electrocatalyst composed of electrochemically inactive conducting polyaniline (PANI) and non-precious Fe-based oxide Fe3O4 is presented. PANI molecules were in-situ loaded on Fe3O4 nanoparticles through an efficient and simple process under mild conditions. The electronic structure of Fe3O4 was modulated by creating a strong interaction with PANI molecules, leading to enhanced activity and stability of the catalyst to achieve 10 mA cm-2 geometrical current density at overpotential of 265 mV in 1 M aqueous KOH solution. This work demonstrates that a highly efficient electrocatalyst can be achieved by molecular modification and provides a novel strategy for the optimization of the inactive non-precious catalysts.

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