David A Cullen Senior R&D Staff Contact cullenda@ornl.gov | 865.576.0230 All Publications Construction of Inverse Metal–Zeolite Interfaces via Area-Selective Atomic Layer Deposition... Effects of Ink Formulation on the Structure and Performance of PGM-Free Catalyst Layer in PEMFCs Bridging Thermal Catalysis and Electrocatalysis: Catalyzing CO2 Conversion with Carbon-Based Materials... Quantifying the projected unit cell size variation of off-axis PtCo catalyst nanoparticles through 4D-STEM... Automated methods for improved characterization of alloy nanoparticle catalysts... Atomic-scale Imaging of PGM-free Catalyst Active Sites by 30 keV 4D-STEM... General synthesis of single-atom catalysts with high metal loading using graphene quantum dots... Chemical vapour deposition of Fe–N–C oxygen reduction catalysts with full utilization of dense Fe–N4 sites... Hollow Silica Particles: A Novel Strategy for Cost Reduction... Electrochemical ammonia synthesis via nitrate reduction on Fe single atom catalyst... Impact of Carbon Support Structure on the Durability of PtCo Electrocatalysts... Impact of Catalyst Ink Dispersing Solvent on PEM Fuel Cell Performance and Durability... Porphyrin Aerogel Catalysts for Oxygen Reduction Reaction in Anion-Exchange Membrane Fuel Cells... Ultrathin platinum nanowire based electrodes for high-efficiency hydrogen generation in practical electrolyzer cells... Constructing Ultrathin W-Doped NiFe Nanosheets via Facile Electrosynthesis as Bifunctional Electrocatalysts for Efficient Wat... Effect of Catalyst and Catalyst Layer Composition on Catalyst Support Durability... Highly Efficient Plasmon Induced Hot-Electron Transfer at Ag/TiO2 Interface... Synthesis strategies toward improved ordering of [MnO6] octahedra in tunnel structured 2 × 3 and 2 × 4 MnO2... Single Atomic Iron Site Catalysts via Benign Aqueous Synthesis for Durability Improvement in Proton Exchange Membrane Fuel Ce... New roads and challenges for fuel cells in heavy-duty transportation... Promoting Atomically Dispersed MnN 4 Sites via Sulfur Doping for Oxygen Reduction: Unveiling Intrinsic Activity and Degradati... Dynamically Unveiling Metal–Nitrogen Coordination during Thermal Activation to Design High-Efficient Atomically Dispersed C... AuPd Nanoicosahedra: Atomic-Level Surface Modulation for Optimization of Electrocatalytic and Photocatalytic Energy Conversio... Status and challenges for the application of platinum group metal-free catalysts in proton-exchange membrane fuel cells... Tailoring the Radionuclide Encapsulation and Surface Chemistry of La(223Ra)VO4 Nanoparticles for Targeted Alpha Therapy... Pagination First page « First Previous page ‹‹ … Page 3 Current page 4 Page 5 … 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