Iron-Based Molecular Water Oxidation Catalysts: Abundant, Cheap, and Promising

2018 ◽  
Vol 14 (1) ◽  
pp. 31-43 ◽  
Author(s):  
Tianqi Liu ◽  
Biaobiao Zhang ◽  
Licheng Sun
Keyword(s):  
Water Oxidation ◽  
Molecular Water ◽  
Oxidation Catalysts ◽  
Iron Based

scholarly journals Design of Molecular Water Oxidation Catalysts Stabilized by Ultrathin Inorganic Overlayers—Is Active Site Protection Necessary?

Inorganics ◽  
2018 ◽  
Vol 6 (4) ◽  
pp. 105 ◽  
Author(s):  
Laurent Sévery ◽  
Sebastian Siol ◽  
S. Tilley
Keyword(s):  
Water Oxidation ◽  
Atomic Layer ◽  
Deposition Process ◽  
Operating Conditions ◽  
Molecular Water ◽  
Side Reactions ◽  
Aqueous Environment ◽  
Oxidation Catalysts ◽  
Initial Onset ◽  
Anchoring Groups

Anchored molecular catalysts provide a good step towards bridging the gap between homogeneous and heterogeneous catalysis. However, applications in an aqueous environment pose a serious challenge to anchoring groups in terms of stability. Ultrathin overlayers embedding these catalysts on the surface using atomic layer deposition (ALD) are an elegant solution to tackle the anchoring group instability. The propensity of ALD precursors to react with water leads to the question whether molecules containing aqua ligands, such as most water oxidation complexes, can be protected without side reactions and deactivation during the deposition process. We synthesized two iridium and two ruthenium-based water oxidation catalysts, which contained an aqua ligand (Ir–OH2 and Ru–OH2) or a chloride (Ir–Cl and Ru–Cl) that served as a protecting group for the former. Using a ligand exchange reaction on the anchored and partially embedded Ru–Cl, the optimal overlayer thickness was determined to be 1.6 nm. An electrochemical test of the protected catalysts on meso-ITO showed different behaviors for the Ru and the Ir catalysts. The former showed no onset difference between protected and non-protected versions, but limited stability. Ir–Cl displayed excellent stability, whilst the unprotected catalyst Ir–OH2 showed a later initial onset. Self-regeneration of the catalytic activity of Ir–OH2 under operating conditions was observed. We propose chloride ligands as generally applicable protecting groups for catalysts that are to be stabilized on surfaces using ALD.

scholarly journals Molecular water-oxidation catalysts for photoelectrochemical cells

2009 ◽  
pp. 9374 ◽  
Author(s):  
Robin Brimblecombe ◽  
G. Charles Dismukes ◽  
Gerhard F. Swiegers ◽  
Leone Spiccia
Keyword(s):  
Water Oxidation ◽  
Photoelectrochemical Cells ◽  
Molecular Water ◽  
Oxidation Catalysts

Fast and Simple Preparation of Iron-Based Thin Films as Highly Efficient Water-Oxidation Catalysts in Neutral Aqueous Solution

2015 ◽  
Vol 127 (16) ◽  
pp. 4952-4957 ◽  
Author(s):  
Yizhen Wu ◽  
Mingxing Chen ◽  
Yongzhen Han ◽  
Hongxia Luo ◽  
Xiaojun Su ◽  
...  
Keyword(s):  
Thin Films ◽  
Aqueous Solution ◽  
Water Oxidation ◽  
Oxidation Catalysts ◽  
Highly Efficient ◽  
Simple Preparation ◽  
Neutral Aqueous Solution ◽  
Iron Based

Insights into Ru-Based Molecular Water Oxidation Catalysts: Electronic and Noncovalent-Interaction Effects on Their Catalytic Activities

2013 ◽  
Vol 52 (14) ◽  
pp. 7844-7852 ◽  
Author(s):  
Lele Duan ◽  
Lei Wang ◽  
A. Ken Inge ◽  
Andreas Fischer ◽  
Xiaodong Zou ◽  
...  
Keyword(s):  
Water Oxidation ◽  
Interaction Effects ◽  
Noncovalent Interaction ◽  
Molecular Water ◽  
Oxidation Catalysts ◽  
Catalytic Activities

scholarly journals Rational Design Rules for Molecular Water Oxidation Catalysts based on Scaling Relationships

2017 ◽  
Vol 23 (65) ◽  
pp. 16413-16418 ◽  
Author(s):  
Joeri Hessels ◽  
Remko J. Detz ◽  
Marc T. M. Koper ◽  
Joost N. H. Reek
Keyword(s):  
Water Oxidation ◽  
Rational Design ◽  
Molecular Water ◽  
Oxidation Catalysts ◽  
Design Rules ◽  
Scaling Relationships

Highly efficient and robust molecular water oxidation catalysts based on ruthenium complexes

2014 ◽  
Vol 50 (85) ◽  
pp. 12947-12950 ◽  
Author(s):  
Lei Wang ◽  
Lele Duan ◽  
Ying Wang ◽  
Mårten S. G. Ahlquist ◽  
Licheng Sun
Keyword(s):  
Catalytic Activity ◽  
Dicarboxylic Acid ◽  
Water Oxidation ◽  
Ruthenium Complexes ◽  
Molecular Water ◽  
Oxidation Catalysts ◽  
Turnover Number ◽  
High Turnover ◽  
Molecular Catalyst ◽  
Highly Efficient

The molecular catalyst Ru(bda)L2 (H2bda = 2,2′-bipyridine-6,6′-dicarboxylic acid, L = 6-bromophthalazine) shows excellent catalytic activity for water oxidation. By using Ce(NH4)2(NO3)6 as an oxidant, the catalyst reached a high turnover number TON = 100 000 in 3 hours.

Molecular Water Oxidation Catalysts from Iron

2014 ◽  
pp. 153-162 ◽  
Author(s):  
W. Chadwick Ellis ◽  
Neal D. McDaniel ◽  
Stefan Bernhard
Keyword(s):  
Water Oxidation ◽  
Molecular Water ◽  
Oxidation Catalysts
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