Fast microwave-induced synthesis of solid cobalt hydroxide nanorods and their thermal conversion into porous cobalt oxide nanorods for efficient oxygen evolution reaction

2019 ◽  
Vol 3 (7) ◽  
pp. 1713-1719 ◽  
Author(s):  
Dattatray S. Dhawale ◽  
Pradnya Bodhankar ◽  
Neharani Sonawane ◽  
Pradip B. Sarawade
Keyword(s):  
Cobalt Oxide ◽  
Water Splitting ◽  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Thermal Conversion ◽  
Cobalt Hydroxide ◽  
Highly Efficient ◽  
Oxide Nanorods ◽  
Electrochemical Devices ◽  
Nonprecious Metal

Oxygen evolution reaction (OER) in water splitting is one of the most critical and more demanding half-reactions in electrochemical devices; therefore, the design of highly efficient and nonprecious metal-based electrocatalysts is required.

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.

Template-directed synthesis of sulphur doped NiCoFe layered double hydroxide porous nanosheets with enhanced electrocatalytic activity for the oxygen evolution reaction

2018 ◽  
Vol 6 (7) ◽  
pp. 3224-3230 ◽  
Author(s):  
Li-Ming Cao ◽  
Jia-Wei Wang ◽  
Di-Chang Zhong ◽  
Tong-Bu Lu
Keyword(s):  
Water Splitting ◽  
Oxygen Evolution ◽  
Layered Double Hydroxide ◽  
Oxygen Evolution Reaction ◽  
Electrocatalytic Activity ◽  
Hydrogen Energy ◽  
Highly Efficient ◽  
Porous Nanosheets ◽  
Directed Synthesis ◽  
Double Hydroxide

The development of readily available, highly efficient and stable electrocatalysts for the oxygen evolution reaction (OER) is extremely significant to facilitate water splitting for the generation of clean hydrogen energy.

A layered Na1−xNiyFe1−yO2double oxide oxygen evolution reaction electrocatalyst for highly efficient water-splitting

2017 ◽  
Vol 10 (1) ◽  
pp. 121-128 ◽  
Author(s):  
Baicheng Weng ◽  
Fenghua Xu ◽  
Changlei Wang ◽  
Weiwei Meng ◽  
Corey R. Grice ◽  
...  
Keyword(s):  
Solar Cell ◽  
Water Splitting ◽  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Perovskite Solar Cell ◽  
Highly Efficient

Novel layered Na1−xNiyFe1−yO2OER catalysts outperform IrO2, RuO2, and NiFe-LDH, reaching an 11.22% solar/H2efficiency for a perovskite solar cell.

Mo-doped Ni2P hollow nanostructures: highly efficient and durable bifunctional electrocatalysts for alkaline water splitting

2019 ◽  
Vol 7 (13) ◽  
pp. 7636-7643 ◽  
Author(s):  
Qin Wang ◽  
Hongyang Zhao ◽  
Fumin Li ◽  
Wenyan She ◽  
Xiaoming Wang ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Water Splitting ◽  
Oxygen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Oxygen Evolution Reaction ◽  
Alkaline Water ◽  
Highly Efficient ◽  
Bifunctional Electrocatalysts ◽  
Hollow Nanostructures ◽  
Reaction Performance

It was found that Mo-doped Ni2P hollow nanostructures display excellent hydrogen evolution reaction and oxygen evolution reaction performance.

scholarly journals Protic Imidazolium Polymer as Ion Conductor for Improved Oxygen Evolution Performance

Polymers ◽  
2019 ◽  
Vol 11 (8) ◽  
pp. 1268 ◽  
Author(s):  
Fangfang Zhang ◽  
Minchen Yang ◽  
Siyi Zhang ◽  
Pengfei Fang
Keyword(s):  
Water Splitting ◽  
Oxygen Evolution ◽  
Conceptual Design ◽  
Oxygen Evolution Reaction ◽  
Ion Conductor ◽  
Electrocatalytic Performance ◽  
New Ideas ◽  
Electrochemical Devices ◽  
Acidic Conditions ◽  
Ion Conductors

Improving the electrocatalytic performance of oxygen evolution reaction (OER) is essential for oxygen-involved electrochemical devices, including water splitting and rechargeable metal–air batteries. In this work, we report that the OER performance of commercial catalysts of IrO2, Co3O4, and Pt-C can be improved by replacing the traditional Nafion® ionomer with newly synthesized copolymers consisting of protonated imidazolium moieties such as ion conductors and binders in electrodes. Specifically, such an improvement in OER performance for all the tested catalysts is more significant in basic and neutral environments than that under acidic conditions. We anticipate that the results will provide new ideas for the conceptual design of electrodes for oxygen-involved electrochemical devices.

Non-precious cobalt oxalate microstructures as highly efficient electrocatalysts for oxygen evolution reaction

2015 ◽  
Vol 3 (18) ◽  
pp. 9707-9713 ◽  
Author(s):  
Xiaomin Liu ◽  
Jing Jiang ◽  
Lunhong Ai
Keyword(s):  
Oxygen Evolution ◽  
Alkaline Medium ◽  
Oxygen Evolution Reaction ◽  
Highly Efficient ◽  
Cobalt Oxalate ◽  
Nonprecious Metal

CoC2O4·2H2O microstructures as nonprecious metal-based electrocatalysts exhibited remarkable activity for catalyzing OER in alkaline medium.

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