David A Cullen Senior R&D Staff Contact cullenda@ornl.gov | 865.576.0230 All Publications Unveiling mechanism of surface-guided platinum nanowire growth Tracking Degradation in Individual Catalyst Nanoparticles Under Fuel Cell-Relevant Cycling Conditions by Identical-Location STEM Tracking Nanoparticle Degradation across Fuel Cell Electrodes by Automated Analytical Electron Microscopy... Imaging Sensitive Catalyst Active Site Structure by 30 keV Electron Ptychography... Improved Throughput, Statistics, and Instrument Utilization with Automated Analytical Electron Microscopy... Understanding Recoverable vs Unrecoverable Voltage Losses and Long-Term Degradation Mechanisms in Anion Exchange Membrane Fue... Elucidating the Roles of Amorphous Alumina Overcoat in Palladium-Catalyzed Selective Hydrogenation Electrolyzer Performance Loss from Accelerated Stress Tests and Corresponding Changes to Catalyst Layers and Interfaces... Coupled continuum and network model framework to study catalyst layers of polymer electrolyte fuel cells Standardized protocols for evaluating platinum group metal-free oxygen reduction reaction electrocatalysts in polymer electro... Forum on Materials and Interfaces for Energy Storage and Conversion Efficient conversion of low-concentration nitrate sources into ammonia on a Ru-dispersed Cu nanowire electrocatalyst... Recovering carbon losses in CO2 electrolysis using a solid electrolyte reactor... Chemical preintercalation synthesis approach for the formation of new layered tungsten oxides... Recreating Fuel Cell Catalyst Degradation in Aqueous Environments for Identical-Location Scanning Transmission Electron Micro... Exploring the Impacts of Conditioning on Proton Exchange Membrane Electrolyzers by In Situ Visualization and Electrochemistry... Tuning Catalyst Activation and Utilization Via Controlled Electrode Patterning for Low-Loading and High-Efficiency Water Elec... Mesoporous textured Fe-N-C electrocatalysts as highly efficient cathodes for proton exchange membrane fuel cells Covalent Organic Framework (COF) Derived Ni-N-C Catalysts for Electrochemical CO2 Reduction: Unraveling Fundamental Kinetic a... Pt Particle Size Affects Both the Charge Separation and Water Reduction Efficiencies of CdS–Pt Nanorod Photocatalysts for L... Insights into the rapid two-phase transport dynamics in different structured porous transport layers of water electrolyzers t... Nanocolumnar Pt:Ni Alloy Thin Films by High Pressure Sputtering for Oxygen Reduction Reaction... W-induced morphological modification of NiFe layered double hydroxides as efficient electrocatalysts for overall water splitt... Slow Auger Recombination of Trapped Excitons Enables Efficient Multiple Electron Transfer in CdS–Pt Nanorod Heterostructure... Effects of Ink Formulation on the Structure and Performance of PGM-Free Catalyst Layer in PEMFCs Pagination First page « First Previous page ‹‹ … Page 2 Current page 3 Page 4 … Next page ›› Last page Last » Key Links Curriculum Vitae ORCID Organizations Physical Sciences Directorate User Facilities Center for Nanophase Materials Sciences Nanomaterials Characterization Section Materials Microanalysis Group