Iron phosphate modified calcium iron oxide as an efficient and robust catalyst in electrocatalyzing oxygen evolution from seawater

2019 ◽  
Vol 215 ◽  
pp. 205-215 ◽  
Author(s):  
Wei-Hsiang Huang ◽  
Chia-Yu Lin
Keyword(s):  
Iron Oxide ◽  
High Activity ◽  
Oxygen Evolution ◽  
Iron Phosphate ◽  
Natural Seawater ◽  
Calcium Iron

CaFeOx modified with electrodeposited FePO4 exhibits high activity and stability in natural seawater splitting.

Calcium containing iron oxide as an efficient and robust catalyst in (photo-)electrocatalytic water oxidation at neutral pH

2018 ◽  
Vol 2 (1) ◽  
pp. 271-279 ◽  
Author(s):  
Hung-Chun Chiu ◽  
Wei-Hsiang Huang ◽  
Liang-Ching Hsu ◽  
Yan-Gu Lin ◽  
Yi-Hsuan Lai ◽  
...  
Keyword(s):  
Iron Oxide ◽  
High Activity ◽  
Water Oxidation ◽  
Iron Phosphate ◽  
Neutral Ph ◽  
Amorphous Nature

The amorphous nature and in situ formation of iron phosphate render CaFeOx with high activity and stability for the OER at neutral pH.

scholarly journals Effects of Annealing Temperature on the Oxygen Evolution Reaction Activity of Copper–Cobalt Oxide Nanosheets

Nanomaterials ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 657
Author(s):  
Geul Han Kim ◽  
Yoo Sei Park ◽  
Juchan Yang ◽  
Myeong Je Jang ◽  
Jaehoon Jeong ◽  
...  
Keyword(s):  
High Activity ◽  
Cobalt Oxide ◽  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Low Cost ◽  
High Surface ◽  
High Surface Area ◽  
Cobalt Hydroxide ◽  
Ni Foam ◽  
Electron Conduction

Developing high performance, highly stable, and low-cost electrodes for the oxygen evolution reaction (OER) is challenging in water electrolysis technology. However, Ir- and Ru-based OER catalysts with high OER efficiency are difficult to commercialize as precious metal-based catalysts. Therefore, the study of OER catalysts, which are replaced by non-precious metals and have high activity and stability, are necessary. In this study, a copper–cobalt oxide nanosheet (CCO) electrode was synthesized by the electrodeposition of copper–cobalt hydroxide (CCOH) on Ni foam followed by annealing. The CCOH was annealed at various temperatures, and the structure changed to that of CCO at temperatures above 250 °C. In addition, it was observed that the nanosheets agglomerated when annealed at 300 °C. The CCO electrode annealed at 250 °C had a high surface area and efficient electron conduction pathways as a result of the direct growth on the Ni foam. Thus, the prepared CCO electrode exhibited enhanced OER activity (1.6 V at 261 mA/cm2) compared to those of CCOH (1.6 V at 144 mA/cm2), Co3O4 (1.6 V at 39 mA/cm2), and commercial IrO2 (1.6 V at 14 mA/cm2) electrodes. The optimized catalyst also showed high activity and stability under high pH conditions, demonstrating its potential as a low cost, highly efficient OER electrode material.

Oxygen-evolution reactions (OER) on transition-metal-doped Fe3Co(PO4)4 iron-phosphate surfaces: a first-principles study

2021 ◽  
Author(s):  
Yogeshwaran Krishnan ◽  
Sateesh Bandaru ◽  
Niall J. English
Keyword(s):  
Density Functional Theory ◽  
Transition Metal ◽  
Oxygen Evolution ◽  
First Principles ◽  
Density Functional ◽  
Iron Phosphate ◽  
Functional Theory ◽  
First Principles Study ◽  
Metal Doped ◽  
Catalyst Surfaces

A series of transition-metal-doped Fe1−xMxCo(PO4)4(010) and Fe3Co1−xMx(PO4)4(010) electro-catalyst surfaces (with M = Mn, Os, Ru, Rh and Ir) have been modelled via density-functional theory (DFT) to gauge their oxygen-evolution reactions (OER).

scholarly journals Self-Supported Hydrous Iridium–Nickel Oxide Two-Dimensional Nanoframes for High Activity Oxygen Evolution Electrocatalysts

ACS Catalysis ◽  
2018 ◽  
Vol 8 (11) ◽  
pp. 10498-10520 ◽  
Author(s):  
Fernando Godínez-Salomón ◽  
Luis Albiter ◽  
Shaun M. Alia ◽  
Bryan S. Pivovar ◽  
Luis E. Camacho-Forero ◽  
...  
Keyword(s):  
Nickel Oxide ◽  
High Activity ◽  
Oxygen Evolution ◽  
Two Dimensional

The synergetic effect of h-BN shells and subsurface B in CoBx@h-BN nanocatalysts for enhanced oxygen evolution reactions

2018 ◽  
Vol 6 (23) ◽  
pp. 10644-10648 ◽  
Author(s):  
Siru Chen ◽  
Yanqiang Li ◽  
Zhihua Zhang ◽  
Qiang Fu ◽  
Xinhe Bao
Keyword(s):  
High Activity ◽  
Oxygen Evolution ◽  
Synergetic Effect ◽  
Core Shell ◽  
Alloy Nanoparticles

CoBx@h-BN core–shell nanocatalysts were prepared via ammonization of Co–B alloy nanoparticles showing high activity and stability in oxygen evolution reactions.

Microstructure, Stiffness and Corrosion of Bare and Phosphated Specimens Made by Sintering of Structured Iron-Iron Oxide Spheres

2020 ◽  
Vol 405 ◽  
pp. 411-416
Author(s):  
Miriam Kupková ◽  
Martin Kupka ◽  
Renáta Oriňáková ◽  
Radka Gorejová
Keyword(s):  
Iron Oxide ◽  
Iron Oxides ◽  
Metallic Iron ◽  
Galvanic Corrosion ◽  
Iron Phosphate ◽  
Reduction Reaction ◽  
Diffusion Control ◽  
Iron Oxide Particles ◽  
Flow Through ◽  
Iron Iron

Granulated iron oxide particles were incompletely reduced to structured particles comprised metallic iron and residual iron oxides. Structured particles were pressed into prismatic compacts and sintered. Some of sintered specimens were subsequently phosphatized and calcined. Specimens with an iron phosphate coating were found stiffer than specimens without coating. In Hanks' solution, a galvanic corrosion was induced by more noble iron oxides coupled to a less noble metallic iron. This could explain higher corrosion potentials and higher rates of iron dissolution in comparison with a pure iron. The coating of specimens with iron phosphates shifted corrosion potentials towards more negative values and slowed down the dissolution of iron. This was most likely caused by a reduction in oxygen flow through the coating to iron-oxide cathodes, which has enhanced the influence of diffusion control on the kinetics of reduction reaction.

High topological tri-metal phosphide of CoP@FeNiP toward enhanced activities in oxygen evolution reaction

Nanoscale ◽  
2021 ◽  
Author(s):  
Jianzhi Wang ◽  
Chen Chen ◽  
Ning Cai ◽  
Miao Wang ◽  
Hui Li ◽  
...  
Keyword(s):  
High Activity ◽  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Precious Metal ◽  
Low Cost ◽  
Metal Phosphide

The development of non-precious metal electrocatalysts with high activity, good durability and low cost to replace precious metal electrocatalysts is highly demanded for oxygen evolution reaction (OER).

Self-supported Co-doped FeNi carbonate hydroxide nanosheet array as a highly efficient electrocatalyst towards the oxygen evolution reaction in an alkaline solution

Nanoscale ◽  
2019 ◽  
Vol 11 (22) ◽  
pp. 10595-10602 ◽  
Author(s):  
Yu-Feng Qi ◽  
Qian Wang ◽  
Xiu-Guang Wang ◽  
Zheng-Yu Liu ◽  
Xiao-Jun Zhao ◽  
...  
Keyword(s):  
High Activity ◽  
Oxygen Evolution ◽  
Alkaline Solution ◽  
Oxygen Evolution Reaction ◽  
Nickel Foam ◽  
Highly Efficient ◽  
Nanosheet Array ◽  
Carbonate Hydroxide ◽  
Co Doped ◽  
Excellent Stability

A Co-doped FeNi carbonate hydroxide nanosheet array supported on nickel foam served as an efficient oxygen evolution electrocatalyst with a high activity and excellent stability.

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