Publication date: 17th July 2025
While most focus on entropy designed single-phase materials, we are exploring the potential to design and utilize secondary phases in high-entropy oxides (HEOs) to introduce tunable and reversible composite properties [1. Vahidi (2024) Adv. Func. Mater.]. I will discuss our recent works developing high-entropy-oxide-derived nanocomposite electroceramic thin films using a flexible approach – “exsolution self-assembly” (ESA) – that combines traditional immiscibility driven self-assembly concepts with defect-chemistry-governed exsolution phenomena into [2. Guo (2024) Matter; 3. Guo (2024) Appl. Phys. Lett]. During physical vapor deposition, ESA yields HEO-based nanocomposite thin films with intricate multi-element nanostructures and precisely tailorable surfaces. In an ongoing study, we’ve used this approach for high-throughput electrocatalyst library synthesis coupled with CO2 reduction reaction activity screening by electrochemical cell microscopy [4. Xuan (In revision)]. Importantly, by utilizing a suite of multiscale characterization down to the atomic-scale, these works provide a set of design guidelines for novel self-assembled nanocomposite oxide thin films incorporating entropy-designed materials, which offer a vast compositional landscape to explore and develop.
Portions of this research was primarily supported by the National Science Foundation Materials Research Science and Engineering Center program through the UC Irvine Center for Complex and Active Materials (NSF MRSEC CCAM DMR-2011967). We acknowledge the use of facilities and instrumentation at the UC Irvine Materials Research Institute (IMRI) supported in part by the same NSF MRSEC (DMR-2011967). Additional funding was provided from the Research Corporation for Scientific Advancement under the Scialog Award on Negative Emissions Sciences. Portions of this research was primarily supported by the National Science Foundation CAREER (DMR-2042638) and American Chemical Society Petroleum Research Fund (61961-DNI).
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