A5072919330- Electrocatalysts for Energy Conversion
- Fuel Cells and Related Materials
- Hybrid Renewable Energy Systems
- MXene and MAX Phase Materials
- Inorganic Chemistry and Materials
- Electronic and Structural Properties of Oxides
- Advanced Photocatalysis Techniques
- Supercapacitor Materials and Fabrication
- Gas Sensing Nanomaterials and Sensors
- Perovskite Materials and Applications
- Advanced battery technologies research
- Machine Learning in Materials Science
- Metal and Thin Film Mechanics
- Advanced Condensed Matter Physics
- Electrochemical Analysis and Applications
- Magnetic and transport properties of perovskites and related materials
- Electric Vehicles and Infrastructure
- Advanced Battery Technologies Research
Argonne National Laboratory
2025
Northwestern University
2022-2024
Abstract An improved understanding of catalyst dynamics for the oxygen evolution reaction (OER) in acid is critical informing development highly efficient, stable, and cost‐effective OER catalysts proton exchange membrane water electrolysis applications. Herein tunable, active, dynamic Ir 5+ materials are studied, Ln 3 IrO 7 (Ln = Pr, Nd, Sm, Eu). Leveraging a combination situ ex characterization, as well an advanced mercury underpotential deposition technique surface site quantification,...
Anion exchange membrane water electrolysis (AEMWE) is an emerging technology for the low-cost production of hydrogen. However, efficiency and durability AEMWE devices currently insufficient to compete with other low-temperature technologies. The porous transport layer (PTL) a critical cell component that remains relatively unoptimized AEMWE. In this study, we demonstrate device performance significantly affected by morphology composition PTL. For Ni fiber-based PTLs ∼2 μm Co3O4 oxygen...
Heteroanionic materials exhibit great structural diversity with adjustable electronic, magnetic, and optical properties that provide immense opportunities for design. Within this material family, perovskite oxynitrides incorporate earth-abundant nitrogen differing size, electronegativity, charge into oxide, enabling a unique approach to tuning metal-anion covalency energy of metal cation electronic states, thereby achieving functionality may be inaccessible from their oxide counterparts,...
Abstract Carbon‐supported Pt nanoparticles are the leading catalysts for cathode oxygen reduction reaction (ORR) in polymer electrolyte membrane fuel cells. However, these ORR suffer from poor electrochemical durability, particularly loss of surface area (ECSA) due to nanoparticle dissolution and agglomeration. Here, is mitigated through a Pickering emulsion‐processing strategy that employs graphene nanoplatelet dispersions stabilized by ethyl cellulose. The resulting graphene‐Pt/Vulcan...
The formation and study of oxygen vacancies are critical for the development enhanced functional oxides; in evolution reaction (OER), proposed to influence activity degradation electrocatalysts. We use thin films state-of-the-art OER catalyst $\mathrm{SrIr}{\mathrm{O}}_{3}$ deposited on crystal substrates with varied lattice parameters demonstrate effect epitaxial strain vacancy formation. Through situ x-ray diffraction under elevated temperatures reducing conditions 3%...
Perovskite oxynitrides, in addition to being promising electrocatalysts and photoabsorbers, present an interesting case study crystal symmetry. Full or partial ordering of the O N anions affects global symmetry influences material performance functionality; however, anion is challenging detect experimentally. In this work, we synthesize a novel perovskite oxynitride CaW(O,N)
Hydrogen is positioned to play a pivotal role in the future energy landscape, bolstered by increasing adoption of renewable sources. The U.S. Department Energy (DOE) has initiated earth shot, with goal achieving cost target $1 per kilogram hydrogen within decade. Polymer electrolyte membrane water electrolyzers (PEMWE) are at forefront enabling production from electricity. Yet, 80000 h operational lifetime remains critical challenge for commercial viability PEMWE. 1 An in-depth understanding...
Anion exchange membrane water electrolyzers (AEMWEs) present a lower cost option for hydrogen generation with respect to their proton counterpart due the possibility of utilizing platinum group metal-free catalysts drive oxygen evolution reaction (OER) at anode. The addition iron (Fe) nickel-(oxy)hydroxides has been shown significantly enhance OER catalytic activity, although precise mechanisms are still under debate. A clearer picture structure these catalysts, particularly during...
Molybdenum nitrides and oxynitrides have been increasingly realized as (electro)catalysts for a variety of reactions. In this context, the cubic "γ-Mo2N", also known to contain oxygen in bulk, is particular interest. The γ phase typically derived from ammonolysis MoO3, high temperature needed fully react stable MoO2 intermediate that often forms along reaction pathway. study, atypical bronze (HxMoO3) peroxo (H2MoO5) precursors was undertaken avoid formation undesired with aim synthesizing...