Ryan O’Hayre
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Advancing proton-conducting ceramic electrochemical devices: perspectives on benchmarking and barriers to progress Open
Proton-conducting ceramic electrochemical devices (PCCs) show promise for sustainable energy conversion, yet key challenges remain. This perspective highlights critical areas for advancing PCC research. The field requires standardized prot…
Autonomous electrochemical characterization system for combinatorial thin-film solid oxide electrodes Open
The design of materials for electrochemical energy conversion is complicated by multifaceted property requirements: multi-carrier conductivity, stability, and catalytic activity are all necessary but rarely intersect. Meanwhile, the large …
Breakthrough oxygen electrode reaction kinetics using BaCe0.7Zr0.1Y0.1Yb0.1O3−δ based composite air electrodes for reversible solid oxide cells Open
For nearly half a century, composite air electrode architectures based on an oxygen-ion conducting Gd0.1Ce0.9O2–δ (GDC) electrolyte phase and a catalytically-active, electronically conductive second phase have dominated solid-oxide electro…
View article: Compositional effects on the triple conduction behavior of Ba[CoxFe0.8-xZr0.1Y0.1]O3-δ (BCFZY) - <i>Insights from neutron total scattering studies</i>
Compositional effects on the triple conduction behavior of Ba[CoxFe0.8-xZr0.1Y0.1]O3-δ (BCFZY) - <i>Insights from neutron total scattering studies</i> Open
Triple-conducting perovskite oxides are well-known for their outstanding electrocatalytic activity, thermal and chemical stability, and remarkable simultaneous ionic and electronic conduction rendering them exceptionally valuable for servi…
Insights on proton‐conducting ceramic electrochemical cell fabrication Open
This study investigates the key factors influencing sintering behavior and grain growth in (BCZYYb4411)–NiO negatrodes and BCZYYb electrolytes for protonic ceramic electrochemical cells (PCECs). Elastic net machine learning models are appl…
View article: Data-driven insights into protonic-ceramic fuel cell and electrolysis performance
Data-driven insights into protonic-ceramic fuel cell and electrolysis performance Open
Lowering the electrolyte thickness to grain size ratio, using smaller NiO particles, and removing organics before sintering boosts performance. The positrode is key for fuel cell performance, while the electrolyte impacts electrolysis.
Statistical design of experiments for efficient performance characterization of protonic-ceramic electrolysis cells Open
Obtaining a cohesive understanding of performance in protonic-ceramic electrolysis cells is difficult due to the wide operating space coupled with low-throughput diagnostic techniques, sluggish system dynamics, and cell degradation. In thi…
Advanced microstructure characterization and microstructural evolution of porous cermet electrodes in solid oxide cells: A comprehensive review Open
Solid oxide cells (SOCs), capable of interconverting electrical and chemical energy, have emerged as one of the key technologies for the future multi-energy complementary grid. However, the commercialization of SOCs is hindered by poor lon…
Towards improved stability in proton-conducting ceramic fuel cells Open
Stability of proton-conducting ceramic fuel cells (PCFCs) is not well understood. Many stable cells are reported in the literature. However, unstable cells generally go unstudied. This paper explores and identifies sources of instability, …
Improving tubular protonic ceramic fuel cell performance by compensating Ba evaporation via a Ba-excess optimized proton conducting electrolyte synthesis strategy Open
Protonic ceramic fuel cells (PCFCs) are emerging as a promising technology for reduced temperature ceramic energy conversion devices. The BaCe 0.4 Zr 0.4 Y 0.1 Yb 0.1 O 3− δ (BCZYYb4411) electrolyte is notable for its high proton conductiv…
Reliable operation of Cr2O3:Mg/β-Ga2O3 p–n heterojunction diodes at 600 °C Open
Beta gallium oxide (β-Ga2O3)-based semiconductor heterojunctions have recently demonstrated improved performance at high voltages and elevated temperatures and are, thus, promising for applications in power electronic devices and harsh env…
Addressing Critical Problems in Materials Science Through Multiscale and Multimode Characterization (Project 1); Characterization and Optimization of Novel Triple-Conducting Oxide Materials for Energy Applications (Project 2) (CRADA Final Report) Open
PROJECT 1: Address critical problems in materials science and simultaneously advance the state-of-the-art in multiscale and multimode characterization using the combined advanced analytical capabilities and expertise of Colorado School of …
Predicting Thermochemical Equilibria with Interacting Defects: Alloys for Water Splitting Open
Solar thermochemical hydrogen is one of the few potential routes towards direct fuel production from renewable energy sources, but the thermodynamic boundary conditions for efficient and economic energy conversion are challenging. Success …
Reliable operation of Cr$_2$O$_3$:Mg/ $β$-Ga$_2$O$_3$ p-n heterojunction diodes at 600$^\circ$C Open
$β$-Ga$_2$O$_3$-based semiconductor heterojunctions have recently demonstrated improved performance at high voltages and elevated temperatures and are thus promising for applications in power electronic devices and harsh-environment sensor…
View article: New Strategy for Boosting Cathodic Performance of Protonic Ceramic Fuel Cells Through Incorporating a Superior Hydronation Second Phase
New Strategy for Boosting Cathodic Performance of Protonic Ceramic Fuel Cells Through Incorporating a Superior Hydronation Second Phase Open
For protonic ceramic fuel cells, it is key to develop material with high intrinsic activity for oxygen activation and bulk proton conductivity enabling water formation at entire electrode surface. However, a higher water content which bene…
View article: Ultrathin stable Ohmic contacts for high-temperature operation of <i>β</i>-Ga2O3 devices
Ultrathin stable Ohmic contacts for high-temperature operation of <i>β</i>-Ga2O3 devices Open
Beta gallium oxide (β-Ga2O3) shows significant promise in high-temperature, high-power, and sensing electronics applications. However, long-term stable metallization layers for Ohmic contacts at high temperatures present unique thermodynam…
View article: Roadmap on exsolution for energy applications
Roadmap on exsolution for energy applications Open
Over the last decade, exsolution has emerged as a powerful new method for decorating oxide supports with uniformly dispersed nanoparticles for energy and catalytic applications. Due to their exceptional anchorage, resilience to various deg…
View article: Ultrathin Stable Ohmic Contacts for High-Temperature Operation of $β$-Ga$_2$O$_3$ Devices
Ultrathin Stable Ohmic Contacts for High-Temperature Operation of $β$-Ga$_2$O$_3$ Devices Open
Beta gallium oxide ($β$-Ga$_2$O$_3$) shows significant promise in the high-temperature, high-power, and sensing electronics applications. However, long-term stable metallization layers for Ohmic contacts at high temperature present unique …
Understanding the effects of fabrication process on BaZr<sub>0.9</sub>Y<sub>0.1</sub>O<sub>3−<i>δ</i></sub> grain-boundary chemistry using atom probe tomography Open
We investigate how four different processing routes influence the grain boundary chemistry of the proton-conducting oxide BaZr 0.9 Y 0.1 O 3− δ (BZY10) via atom probe tomography (APT). Differing processing routes can cause large variations…
Combinatorial impedance spectroscopy with Bayesian analysis for triple ionic-electronic conducting perovskites Open
We construct an empirical map of oxide electrode materials performance relevant to intermediate-temperature electrochemical devices.
Organic ligand-facilitated<i>in situ</i>exsolution of CoFe alloys over Ba<sub>0.5</sub>Sr<sub>0.5</sub>Co<sub>0.8</sub>Fe<sub>0.2</sub>O<sub>3−<i>δ</i></sub>perovskite toward enhanced oxygen electrocatalysis for rechargeable Zn-air batteries Open
Organic ligand facilitated in situ exsolution of CoFe alloys over Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3 perovskite toward enhanced oxygen electrocatalysis for rechargeable Zn-air batteries.