This review article delves into the development of electrolytes for flexible zinc-air batteries (FZABs), a critical component driving the advancement of flexible electronics. We started by surveying the current advancements in electrolyte technologies, including solid-state and gel-based types, and their contributions to enhance the flexibility, efficiency, and durability of FZABs. Secondly, we explored the challenges in this domain, focusing on maintaining electrolyte stability under mechanical stress, ensuring compatibility with flexible substrates, optimizing ion conductivity, and under harsh environmental conditions. Furthermore, the key issues regarding interface details between electrolyte and the electrodes are covered as well. We then discussed the future of electrolyte development in FZABs, highlighting potential avenues such as materials development, sustainability, in-situ studies, and battery integration. This review offers an in-depth overview of the advancements, challenges, and potential breakthroughs in creating electrolytes for FZABs over the past five years. It serves as a guide for both researchers and industry professionals in this dynamic area.

Energy storage and conservation are receiving increased attention due to rising global energy demands. Therefore, the development of energy storage materials is crucial. Thermal energy storage (TES) systems based on phase change materials (PCMs) have increased in prominence over the past two decades, not only because of their outstanding heat storage capacities but also their superior thermal energy regulation capability. However, issues such as leakage and low thermal conductivity limit their applicability in a variety of settings. Carbon-based materials such as graphene and its derivatives can be utilized to surmount these obstacles. This study examines the recent advancements in graphene-based phase change composites (PCCs), where graphene-based nanostructures such as graphene, graphene oxide (GO), functionalized graphene/GO, and graphene aerogel (GA) are incorporated into PCMs to substantially enhance their shape stability and thermal conductivity that could be translated to better storage capacity, durability, and temperature response, thus boosting their attractiveness for TES systems. In addition, the applications of these graphene-based PCCs in various TES disciplines, such as energy conservation in buildings, solar utilization, and battery thermal management, are discussed and summarized.