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Title: Increasing Iridium Oxide Activity for the Oxygen Evolution Reaction with Hafnium Modification

Journal Article · · Journal of the American Chemical Society
DOI:https://doi.org/10.1021/jacs.1c03473· OSTI ID:1838123

Synthesis and implementation of highly active, stable, and affordable electrocatalysts for the oxygen evolution reaction (OER) is a major challenge in developing energy efficient and economically viable energy conversion devices such as electrolyzers, rechargeable metal-air batteries, and regenerative fuel cells. The current benchmark electrocatalyst for OER is based on iridium oxide (IrOx) due to its superior performance and excellent stability. However, large scale applications using IrOx are impractical due to its low abundance and high cost. In this work, we report a highly active hafnium-modified iridium oxide (IrHfxOy) electrocatalyst for OER. The IrHfxOy electrocatalyst demonstrated ten times higher activity in alkaline conditions (pH = 11) and four times higher activity in acid conditions (pH = 1) than a IrOx electrocatalyst. The highest intrinsic mass activity of the IrHfxOy catalyst in acid conditions was calculated as 6950 A gIrOx-1 at an overpotential (η) of 0.3 V. Combined studies utilizing operando surface enhanced Raman spectroscopy (SERS) and DFT calculations revealed that the active sites for OER are the Ir-O species for both IrOx and IrHfxOy catalysts. The presence of Hf sites leads to more negative charge states on nearby O sites, and shortening the bond lengths of Ir-O, and lowering free energies for OER intermediates to accelerate the OER process.

Research Organization:
Princeton Univ., NJ (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division; National Science Foundation (NSF); Simons Foundation; John Templeton Foundation
Grant/Contract Number:
SC0007347; AC02-05CH11231; CHE-1800376; DMR-2011750; 377485; 58851
OSTI ID:
1838123
Journal Information:
Journal of the American Chemical Society, Vol. 143, Issue 38; ISSN 0002-7863
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

References (46)

NixCo3−xO4 Nanowire Arrays for Electrocatalytic Oxygen Evolution journal February 2010
Validation of binuclear descriptor for mixed transition metal oxide supported electrocatalytic water oxidation journal March 2013
Key role of chemistry versus bias in electrocatalytic oxygen evolution journal November 2020
Balancing activity, stability and conductivity of nanoporous core-shell iridium/iridium oxide oxygen evolution catalysts journal November 2017
Synthesis and Activities of Rutile IrO 2 and RuO 2 Nanoparticles for Oxygen Evolution in Acid and Alkaline Solutions journal January 2012
Hydroxide oxidation and peroxide formation at embedded binuclear transition metal sites; TM = Cr, Mn, Fe, Co journal January 2011
Oxygen and hydrogen evolution reactions on Ru, RuO 2 , Ir, and IrO 2 thin film electrodes in acidic and alkaline electrolytes: A comparative study on activity and stability journal March 2016
Self-Supported Hydrous Iridium–Nickel Oxide Two-Dimensional Nanoframes for High Activity Oxygen Evolution Electrocatalysts journal September 2018
A unique oxygen ligand environment facilitates water oxidation in hole-doped IrNiOx core–shell electrocatalysts journal October 2018
The Electrocatalysis of Oxygen Evolution on Perovskites journal January 1984
Electrocatalytic Oxygen Evolution Reaction (OER) on Ru, Ir, and Pt Catalysts: A Comparative Study of Nanoparticles and Bulk Materials journal July 2012
Double perovskites as a family of highly active catalysts for oxygen evolution in alkaline solution journal September 2013
Insight on Tafel slopes from a microkinetic analysis of aqueous electrocatalysis for energy conversion journal September 2015
Synthesis of 3D IrRuMn Sphere as a Superior Oxygen Evolution Electrocatalyst in Acidic Environment journal April 2020
Influence of Adsorbed Water on the Oxygen Evolution Reaction on Oxides journal December 2014
Electrochemical Catalyst–Support Effects and Their Stabilizing Role for IrO x Nanoparticle Catalysts during the Oxygen Evolution Reaction journal September 2016
Regulating Electrocatalysts via Surface and Interface Engineering for Acidic Water Electrooxidation journal October 2019
Co3O4 nanocrystals on graphene as a synergistic catalyst for oxygen reduction reaction journal August 2011
Fundamental Studies of Planar Single-Crystalline Oxide Model Electrodes (RuO 2 , IrO 2 ) for Acidic Water Splitting journal July 2021
Hydrothermal Continuous Flow Synthesis and Exfoliation of NiCo Layered Double Hydroxide Nanosheets for Enhanced Oxygen Evolution Catalysis journal January 2015
Oxygen evolution reaction on IrO2-based DSA® type electrodes: kinetics analysis of Tafel lines and EIS journal July 2004
3D nanoporous iridium-based alloy microwires for efficient oxygen evolution in acidic media journal May 2019
Role of Defects in the Interplay between Adsorbate Evolving and Lattice Oxygen Mechanisms of the Oxygen Evolution Reaction in RuO 2 and IrO 2 journal February 2020
Atomic Iridium Incorporated in Cobalt Hydroxide for Efficient Oxygen Evolution Catalysis in Neutral Electrolyte journal March 2018
Materials for solar fuels and chemicals journal December 2016
An Ir/Ni(OH) 2 Heterostructured Electrocatalyst for the Oxygen Evolution Reaction: Breaking the Scaling Relation, Stabilizing Iridium(V), and Beyond journal May 2020
Remarkable Mass Activities for the Oxygen Evolution Reaction at Iridium Oxide Nanocatalysts Dispersed on Tin Oxides for Polymer Electrolyte Membrane Water Electrolysis journal January 2017
Rational Design of Rhodium–Iridium Alloy Nanoparticles as Highly Active Catalysts for Acidic Oxygen Evolution journal October 2019
In Situ Iridium L III -Edge X-ray Absorption and Surface Enhanced Raman Spectroscopy of Electrodeposited Iridium Oxide Films in Aqueous Electrolytes journal April 2002
Water oxidation intermediates on iridium oxide electrodes probed by in situ electrochemical SHINERS journal January 2020
A highly active and stable IrO x /SrIrO 3 catalyst for the oxygen evolution reaction journal September 2016
Charge-Redistribution-Enhanced Nanocrystalline Ru@IrOx Electrocatalysts for Oxygen Evolution in Acidic Media journal February 2019
pH dependence of OER activity of oxides: Current and future perspectives journal March 2016
Iridium-Based Nanowires as Highly Active, Oxygen Evolution Reaction Electrocatalysts journal January 2018
Iridium As Catalyst and Cocatalyst for Oxygen Evolution/Reduction in Acidic Polymer Electrolyte Membrane Electrolyzers and Fuel Cells journal April 2014
In-situ identification of RuO4 as the corrosion product during oxygen evolution on ruthenium in acid media journal August 1984
The active site for the water oxidising anodic iridium oxide probed through in situ Raman spectroscopy journal January 2017
A Perovskite Oxide Optimized for Oxygen Evolution Catalysis from Molecular Orbital Principles journal October 2011
Nanoporous Iridium-Based Alloy Nanowires as Highly Efficient Electrocatalysts Toward Acidic Oxygen Evolution Reaction journal October 2019
Probing the Structure of a Water-Oxidizing Anodic Iridium Oxide Catalyst using Raman Spectroscopy journal November 2016
Dynamic stability of active sites in hydr(oxy)oxides for the oxygen evolution reaction journal March 2020
Oxide-supported Ir nanodendrites with high activity and durability for the oxygen evolution reaction in acid PEM water electrolyzers journal January 2015
Inductive effect between atomically dispersed iridium and transition-metal hydroxide nanosheets enables highly efficient oxygen evolution reaction journal September 2020
Influence of Surface Adsorption on the Oxygen Evolution Reaction on IrO 2 (110) journal February 2017
Oxygen electrocatalysts in metal–air batteries: from aqueous to nonaqueous electrolytes journal January 2014
Characterization of IrO2 thin films by Raman spectroscopy journal June 1997