The common theme that runs across different research projects in the lab, is rational discovery of energy relevant materials. The process begins with the synthesis of materials, followed by comprehensive structural, chemical, and microstructural characterization using advanced analytical techniques. The measured characteristics are then correlated with the observed physical properties, in our case electrical, optical, thermal, or electrochemical behavior, to establish structure–property-performance relationships. Insights obtained from these correlations guide the refinement of synthesis parameters and material composition, enabling continuous improvement and targeted design of materials with desired functionalities.