Achieving electronic structure reconfiguration in metallic carbides for robust electrochemical water splitting

2020 ◽  
Vol 8 (5) ◽  
pp. 2453-2462 ◽  
Author(s):  
Lulu Qiao ◽  
Anquan Zhu ◽  
Weixuan Zeng ◽  
Rui Dong ◽  
Pengfei Tan ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Water Splitting ◽  
Active Sites ◽  
Metallic Copper ◽  
Structure Modification ◽  
Dual Source ◽  
Electrochemical Water Splitting

The electronic structure modification of metallic carbide is achieved by introducing dual-source transition metallic copper and cobalt atoms, thus contributing abundant active sites to afford decent water splitting performances.

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.

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...

Nanoboxes endow non-noble-metal-based electrocatalysts with high efficiency for overall water splitting

2021 ◽  
Author(s):  
Cheng Wang ◽  
Hongyuan Shang ◽  
Hui Xu ◽  
Yukou Du
Keyword(s):  
Water Splitting ◽  
Noble Metal ◽  
Active Sites ◽  
High Efficiency ◽  
Synergistic Effects ◽  
Electron Mass ◽  
Electronic Effects ◽  
Promising Candidate ◽  
Surface Active ◽  
Electrochemical Water Splitting

Non-noble-metal nanoboxes with abundant surface active sites, facilitated electron/mass transport, favorable synergistic effects and electronic effects, serving as promising candidate materials for boosting electrochemical water splitting.

scholarly journals Construction of FeCo2O4@N-Doped Carbon Dots Nanoflowers as Binder Free Electrode for Reduction and Oxidation of Water

Materials ◽  
2020 ◽  
Vol 13 (14) ◽  
pp. 3119
Author(s):  
Aniruddha Kundu ◽  
Akhmad Irhas Robby ◽  
Arnab Shit ◽  
Hyeong Jun Jo ◽  
Sung Young Park
Keyword(s):  
Water Splitting ◽  
Carbon Dots ◽  
Active Sites ◽  
Nickel Foam ◽  
Alkaline Media ◽  
Superior Performance ◽  
Catalytic Support ◽  
Electrochemical Water Splitting ◽  
Electron Transfer Processes ◽  
Doped Carbon Dots

Electrochemical water splitting is known as a potential approach for sustainable energy conversion; it produces H2 fuel by utilizing transition metal-based catalysts. We report a facile synthesis of FeCo2O4@carbon dots (CDs) nanoflowers supported on nickel foam through a hydrothermal technique in the absence of organic solvents and an inert environment. The synthesized material with a judicious choice of CDs shows superior performance in hydrogen and oxygen evolution reactions (HER and OER) compared to the FeCo2O4 electrode alone in alkaline media. For HER, the overpotential of 205 mV was able to produce current densities of up to 10 mA cm−2, whereas an overpotential of 393 mV was needed to obtain a current density of up to 50 mA cm−2 for OER. The synergistic effect between CDs and FeCo2O4 accounts for the excellent electrocatalytic activity, since CDs offer exposed active sites and subsequently promote the electrochemical reaction by enhancing the electron transfer processes. Hence, this procedure offers an effective approach for constructing metal oxide-integrated CDs as a catalytic support system to improve the performance of electrochemical water splitting.

scholarly journals Fe(III) Ions-Assisted Aniline Polymerization Strategy to Nitrogen-Doped Carbon-Supported Bimetallic CoFeP Nanospheres as Efficient Bifunctional Electrocatalysts toward Overall Water Splitting

Materials ◽  
2021 ◽  
Vol 14 (6) ◽  
pp. 1473
Author(s):  
Changhao Zhao ◽  
Fen Wei ◽  
Haolin Lv ◽  
Dengke Zhao ◽  
Nan Wang ◽  
...  
Keyword(s):  
Water Splitting ◽  
Water Oxidation ◽  
Active Sites ◽  
Alkaline Media ◽  
Alkaline Electrolyte ◽  
Nitrogen Doped ◽  
Overall Water Splitting ◽  
Electrochemical Water Splitting ◽  
Acidic And Alkaline Media ◽  
Aniline Polymerization

It remains an urgent demand and challenging task to design and fabricate efficient, stable, and inexpensive catalysts toward sustainable electrochemical water splitting for hydrogen production. Herein, we explored the use of Fe(III) ion-assisted aniline polymerization strategy to embed bimetallic CoFeP nanospheres into the nitrogen-doped porous carbon framework (referred CoFeP-NC). The as-prepared CoFeP-NC possesses excellent hydrogen evolution reaction (HER) performance with the small overpotential (η10) of 81 mV and 173 mV generated at a current density of 10 mA cm−2 in acidic and alkaline media, respectively. Additionally, it can also efficiently catalyze water oxidation (OER), which shows an ideal overpotential (η10) of 283 mV in alkaline electrolyte (pH = 14). The remarkable catalytic property of CoFeP-NC mainly stems from the strong synergetic effects of CoFeP nanospheres and carbon network. On the one hand, the interaction between the two can make better contact between the electrolyte and the catalyst, thereby providing a large number of available active sites. On the other hand, it can also form a network to offer better durability and electrical conductivity (8.64 × 10−1 S cm−1). This work demonstrates an efficient method to fabricate non-noble electrocatalyst towards overall water splitting, with great application prospect.

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.

Elucidating the electronic structures of β-Ag2MoO4 and Ag2O nanocrystals via theoretical and experimental approaches towards electrochemical water splitting and CO2 reduction

2021 ◽  
Vol 23 (15) ◽  
pp. 9539-9552
Author(s):  
Afsaneh Zareie-Darmian ◽  
Hossein Farsi ◽  
Alireza Farrokhi ◽  
Reza Sarhaddi ◽  
Zhihai Li
Keyword(s):  
Experimental Study ◽  
Electronic Structure ◽  
Electrochemical Properties ◽  
Water Splitting ◽  
Electronic Structures ◽  
Co2 Reduction ◽  
Experimental Approaches ◽  
Electrochemical Water Splitting

In this paper, we demonstrate a combined theoretical and experimental study on the electronic structure, and the optical and electrochemical properties of β-Ag2MoO4 and Ag2O as significant Ag-containing compounds.

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