Nanosized IrO_x–Ir Catalyst with Relevant Activity for Anodes of Proton Exchange Membrane Electrolysis Produced by a Cost‐Effective Procedure

Abstract

Abstract:We have developed ah ighly active nanostructured iridium catalyst for anodes of proton exchange membrane (PEM) electrolysis.C lusters of nanosized crystallites are obtained by reducing surfactant-stabilized IrCl 3 in water-free conditions.T he catalyst shows af ive-fold higher activity towards oxygen evolution reaction (OER) than commercial Ir-black. The improved kinetics of the catalyst are reflected in the high performance of the PEM electrolyzer (1 mg Ir cm À2 ), showing an unparalleled low overpotential and negligible degradation. Our results demonstrate that this enhancement cannot be only attributed to increased surface area, but rather to the ligand effect and low coordinate sites resulting in ahigh turnover frequency (TOF). The catalyst developed herein sets ab enchmark and as trategy for the development of ultra-low loading catalyst layers for PEM electrolysis.

Cobalt-vanadium bimetal-based nanoplates for efficient overall water splitting

“…Further, the active area (S) divided by the scanning rate gives the integrated charge of the peak Q S [46]:…”

A highly-efficient oxygen evolution electrode based on defective nickel-iron layered double hydroxide

“…However, the low efficiency and sluggish kinetics of oxygen evolution reaction (OER) catalysts have restricted the large-scale production of hydrogen [4,5]. Precious metal catalysts (such as IrO 2 and RuO 2 ) have to be involved in the electrode [6][7][8][9] to lower the overpotential and facilitate the OER process, but the limited performance (e.g., an onset potential of 1.5 V) has still hindered their commercialization [10][11][12][13]. Instead, 3d-transition metals (Ni, Co, Fe, etc.)…”

Iridium‐Based Multimetallic Porous Hollow Nanocrystals for Efficient Overall‐Water‐Splitting Catalysis

“…[6,7] Pt and Ir (or Ru)-based nanocrystals are the best metal catalysts for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), respectively, in overall water splitting device, [8][9][10][11] but unfortunately, their further applications are still hindered by their poor intrinsic electrocatalytic activities resulting from sluggish kinetics of HER and OER. [19][20][21][22][23][24][25] Alloying Ir with 3d transition metals is an interesting way to tune the oxygen adsorption energy for promoting catalytic activity for water splitting. [19][20][21][22][23][24][25] Alloying Ir with 3d transition metals is an interesting way to tune the oxygen adsorption energy for promoting catalytic activity for water splitting.…”