Understanding Structure-Dependent Catalytic Performance of Nickel Selenides for Electrochemical Water Oxidation

ACS Catalysis ◽  
2016 ◽  
Vol 7 (1) ◽  
pp. 310-315 ◽  
Author(s):  
Kun Xu ◽  
Hui Ding ◽  
Haifeng Lv ◽  
Shi Tao ◽  
Pengzuo Chen ◽  
...  
Keyword(s):  
Water Oxidation ◽  
Catalytic Performance

scholarly journals Water-Oxidation Electrocatalysis by Manganese Oxides: Syntheses, Electrode Preparations, Electrolytes and Two Fundamental Questions

2020 ◽  
Vol 234 (5) ◽  
pp. 925-978 ◽  
Author(s):  
Jens Melder ◽  
Peter Bogdanoff ◽  
Ivelina Zaharieva ◽  
Sebastian Fiechter ◽  
Holger Dau ◽  
...  
Keyword(s):  
Water Oxidation ◽  
Manganese Oxides ◽  
Catalyst Support ◽  
Catalytic Performance ◽  
Alkaline Solutions ◽  
Oxygen Evolving Complex ◽  
Conducting Oxides ◽  
First Choice ◽  
The Right ◽  
Number Of Equilibria

AbstractThe efficient catalysis of the four-electron oxidation of water to molecular oxygen is a central challenge for the development of devices for the production of solar fuels. This is equally true for artificial leaf-type structures and electrolyzer systems. Inspired by the oxygen evolving complex of Photosystem II, the biological catalyst for this reaction, scientists around the globe have investigated the possibility to use manganese oxides (“MnOx”) for this task. This perspective article will look at selected examples from the last about 10 years of research in this field. At first, three aspects are addressed in detail which have emerged as crucial for the development of efficient electrocatalysts for the anodic oxygen evolution reaction (OER): (1) the structure and composition of the “MnOx” is of central importance for catalytic performance and it seems that amorphous, MnIII/IV oxides with layered or tunnelled structures are especially good choices; (2) the type of support material (e.g. conducting oxides or nanostructured carbon) as well as the methods used to immobilize the MnOx catalysts on them greatly influence OER overpotentials, current densities and long-term stabilities of the electrodes and (3) when operating MnOx-based water-oxidizing anodes in electrolyzers, it has often been observed that the electrocatalytic performance is also largely dependent on the electrolyte’s composition and pH and that a number of equilibria accompany the catalytic process, resulting in “adaptive changes” of the MnOx material over time. Overall, it thus has become clear over the last years that efficient and stable water-oxidation electrolysis by manganese oxides can only be achieved if at least four parameters are optimized in combination: the oxide catalyst itself, the immobilization method, the catalyst support and last but not least the composition of the electrolyte. Furthermore, these parameters are not only important for the electrode optimization process alone but must also be considered if different electrode types are to be compared with each other or with literature values from literature. Because, as without their consideration it is almost impossible to draw the right scientific conclusions. On the other hand, it currently seems unlikely that even carefully optimized MnOx anodes will ever reach the superb OER rates observed for iridium, ruthenium or nickel-iron oxide anodes in acidic or alkaline solutions, respectively. So at the end of the article, two fundamental questions will be addressed: (1) are there technical applications where MnOx materials could actually be the first choice as OER electrocatalysts? and (2) do the results from the last decade of intensive research in this field help to solve a puzzle already formulated in 2008: “Why did nature choose manganese to make oxygen?”.

Ruthenium catalysts for water oxidation involving tetradentate polypyridine-type ligands

2015 ◽  
Vol 185 ◽  
pp. 87-104 ◽  
Author(s):  
Lianpeng Tong ◽  
Ruifa Zong ◽  
Rongwei Zhou ◽  
Nattawut Kaveevivitchai ◽  
Gang Zhang ◽  
...  
Keyword(s):  
Water Oxidation ◽  
Catalytic Performance ◽  
Ruthenium Catalysts ◽  
Oxidation States ◽  
Coordination Geometry ◽  
Tetradentate Ligand ◽  
Catalytic Behavior ◽  
Axial Ligands ◽  
Substituted Pyridines ◽  
Equatorial Ligand

A series of RuII complexes that behave as water oxidation catalysts were prepared involving a tetradentate equatorial ligand and two 4-substituted pyridines as the axial ligands. Two of these complexes were derived from 2,9-di-(pyrid-2′-yl)-1,10-phenanthroline (dpp) and examine the effect of incorporating electron-donating amino and bulky t-butyl groups on catalytic activity. A third complex replaced the two distal pyridines with N-methylimidazoles that are more electron-donating than the pyridines of dpp and potentially stabilize higher oxidation states of the metal. The tetradentate ligand 2-(pyrid-2′-yl)-6-(1′′,10′′-phenanthrol-2′′-yl)pyridine (bpy–phen), possessing a bonding cavity similar to dpp, was also prepared. The RuII complex of this ligand does not have two rotatable pyridines in the equatorial plane and thus shows different flexibility from the [Ru(dpp)] complexes. All the complexes showed activity towards water oxidation. Investigation of their catalytic behavior and electrochemical properties suggests that they may follow the same catalytic pathway as the prototype [Ru(dpp)pic2]2+ involving a seven-coordinated [RuIV(O)] intermediate. The influence of coordination geometry on catalytic performance is analyzed and discussed.

Synthesis and oxygen evolution reaction (OER) catalytic performance of Ni2−xRuxP nanocrystals: enhancing activity by dilution of the noble metal

2017 ◽  
Vol 5 (33) ◽  
pp. 17609-17618 ◽  
Author(s):  
D. Ruchira Liyanage ◽  
Da Li ◽  
Quintin B. Cheek ◽  
Habib Baydoun ◽  
Stephanie L. Brock
Keyword(s):  
Oxygen Evolution ◽  
Noble Metal ◽  
Oxygen Evolution Reaction ◽  
Water Oxidation ◽  
Catalytic Performance ◽  
Redox Behavior

Incorporation of Ru into Ni2P nanoparticles moderates the redox behavior of Ni and lowers the kinetic barrier for water oxidation.

Normal-pulse-voltage-assisted in situ fabrication of graphene-wrapped MOF-derived CuO nanoflowers for water oxidation

2020 ◽  
Vol 56 (62) ◽  
pp. 8750-8753 ◽  
Author(s):  
Ying Wang ◽  
Shiqi Wang ◽  
Dayan Liu ◽  
Lin Zhou ◽  
Ran Du ◽  
...  
Keyword(s):  
Water Oxidation ◽  
Catalytic Performance ◽  
Pulse Voltage ◽  
High Quality ◽  
In Situ Fabrication

Herein, a normal-pulse-voltage-assisted method is proposed for preparation of high quality graphene-wrapped CuO nanoflowers on CF. The as-obtained CuO NF@G/CF electrode exhibits a competitive OER catalytic performance in 1.0 M KOH solution.

Unravelling the Role of Ceria in Improving the Stability of Mo2C Based Catalyst for Steam Reforming of Dimethyl Ether

2021 ◽  
Author(s):  
Jing-Hong Lian ◽  
Hongyi Tan ◽  
Changqing Guo ◽  
Li-sha Shen ◽  
Zhuo-Xin Lu ◽  
...  
Keyword(s):  
Dimethyl Ether ◽  
Steam Reforming ◽  
Water Oxidation ◽  
Molybdenum Carbide ◽  
Catalytic Performance ◽  
Significant Problem ◽  
The Stability

The inactivation of molybdenum carbide catalyst by water oxidation is a significant problem in steam reforming of dimethyl ether (SRD) reaction. In this work, the catalytic performance and stability of...

scholarly journals Enhanced water oxidation catalytic performance of graphene oxide by gamma ray irradiation post-treatment

2019 ◽  
Vol 241 ◽  
pp. 31-34
Author(s):  
Anitha Devadoss ◽  
Subramaniyan Ramasundaram ◽  
K. Asokan ◽  
Byungki Kim ◽  
Sudhagar Pitchaimuthu
Keyword(s):  
Graphene Oxide ◽  
Water Oxidation ◽  
Gamma Ray ◽  
Catalytic Performance ◽  
Post Treatment ◽  
Gamma Ray Irradiation

Binding Energy Optimization Strategy Inducing Enhanced Catalytic Performance on MIL-100(FeNi) To Catalyze Water Oxidation Directly

2019 ◽  
Vol 7 (8) ◽  
pp. 7496-7501 ◽  
Author(s):  
Changqing Li ◽  
Yiwen Liu ◽  
Guo Wang ◽  
Lihao Guan ◽  
Yuqing Lin
Keyword(s):  
Binding Energy ◽  
Water Oxidation ◽  
Energy Optimization ◽  
Catalytic Performance ◽  
Optimization Strategy

Water Oxidation Catalysis: Influence of Anionic Ligands upon the Redox Properties and Catalytic Performance of Mononuclear Ruthenium Complexes

2012 ◽  
Vol 51 (6) ◽  
pp. 3388-3398 ◽  
Author(s):  
Lianpeng Tong ◽  
Ying Wang ◽  
Lele Duan ◽  
Yunhua Xu ◽  
Xiao Cheng ◽  
...  
Keyword(s):  
Water Oxidation ◽  
Ruthenium Complexes ◽  
Catalytic Performance ◽  
Redox Properties ◽  
Oxidation Catalysis ◽  
Anionic Ligands ◽  
Water Oxidation Catalysis

Nitrogen-doped mesoporous carbon nanosheet/carbon nanotube hybrids as metal-free bi-functional electrocatalysts for water oxidation and oxygen reduction

2016 ◽  
Vol 4 (34) ◽  
pp. 13133-13141 ◽  
Author(s):  
Xinzhe Li ◽  
Yiyun Fang ◽  
Shiling Zhao ◽  
Juntian Wu ◽  
Feng Li ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Oxygen Reduction ◽  
Water Oxidation ◽  
Mesoporous Carbon ◽  
Catalytic Performance ◽  
Nitrogen Doped ◽  
Metal Free

Nitrogen-doped mesoporous carbon nanosheet/carbon nanotube hybrids are prepared. This metal-free catalyst exhibits remarkable catalytic performance for both OER and ORR in 0.1 M KOH solution.

scholarly journals Effects of Br substituent on catalytic performance of Ru-bda (H2bda = 2,2'-bipyridine-6,6'-dicarboxylic acid) catalysts for water oxidation

2015 ◽  
Vol 36 (10) ◽  
pp. 1742-1749 ◽  
Author(s):  
Zhao Liu ◽  
Yan Gao ◽  
Ze Yu ◽  
Min Zhang ◽  
Jianhui Liu
Keyword(s):  
Dicarboxylic Acid ◽  
Water Oxidation ◽  
Catalytic Performance ◽  
Acid Catalysts
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