Microwave-Assisted Synthesis of Stable and Highly Active Ir Oxohydroxides for Electrochemical Oxidation of Water.
Water splitting for hydrogen production in acidic media has been limited by the poor stability of the anodic electrocatalyst devoted to the oxygen evolution reaction (OER). To help circumvent this problem we have synthesized a class of novel Ir oxohydroxides by rapid microwave-asisted hydrothermal synthesis, which bridges the gap between electrodeposited amorphous IrOxfilms and crystalline IrO2electrocatalysts prepared by calcination routes. For electrode loadings two orders of magnitude below current standards, the synthesized compounds present an unrivalled combination of high activity and stability under commercially relevant OER conditions in comparison to reported benchmarks, without need for pretreatment. The best compound achieved a lifetime 33 times longer than the best commercial Ir benchmark. Thus, the reported efficient synthesis of an Ir oxohydroxide phase with superior intrinsic OER performance constitutes a major step towards the targeted design of cost-efficient Ir based OER electrocatalysts for acidic media.
Department of Inorganic Chemistry, Fritz-Haber-Institute of the Max-Planck Society, 14195, Berlin, Germany.|Department of Heterogenous Reactions, Max-Planck Institute for Chemical Energy Conversion, 45470, Mülheim-an-der-Ruhr, Germany.
Cyriac
0000-0002-1575-5057
C
Massué
Department of Inorganic Chemistry, Fritz-Haber-Institute of the Max-Planck Society, 14195, Berlin, Germany.
Xing
X
Huang
Department of Inorganic Chemistry, Fritz-Haber-Institute of the Max-Planck Society, 14195, Berlin, Germany.
Andrey
A
Tarasov
Department of Heterogenous Reactions, Max-Planck Institute for Chemical Energy Conversion, 45470, Mülheim-an-der-Ruhr, Germany.
Chinmoy
C
Ranjan
Department of Inorganic Chemistry, Fritz-Haber-Institute of the Max-Planck Society, 14195, Berlin, Germany.
Sébastien
0000-0002-9022-0757
S
Cap
Department of Inorganic Chemistry, Fritz-Haber-Institute of the Max-Planck Society, 14195, Berlin, Germany.|Department of Heterogenous Reactions, Max-Planck Institute for Chemical Energy Conversion, 45470, Mülheim-an-der-Ruhr, Germany.
Robert
R
Schlögl
D002384:Catalysis; D055664:Electrochemical Techniques / Q000379:methods*; D004566:Electrodes; D006878:Hydroxides; D007495:Iridium / Q000737:chemistry*; D008872:Microwaves; D010084:Oxidation-Reduction; D010100:Oxygen / Q000737:chemistry; D014867:Water / Q000737:chemistry*
D006878:Hydroxides; D014867:Water; C044458:iridium oxide; D007495:Iridium; D010100:Oxygen
electrocatalysis; energy storage; iridium; oxygen evolution reaction; water splitting