Nanomaterials have gained notoriety in recent years in the scientific and technological field, mainly due to the significant differences in their chemical, physicochemical, and physical properties concerning mass materials. Consequently, several investigations have taken advantage of these properties to develop nanomaterials focused on their application in significant research areas, such as clean or renewable energy. In clean or renewable energy, nanomaterials have played an essential role in developing more effective devices for collecting solar energy, wind energy, fuel cells, and the harvesting and storage of energy.

There are three large families in nanomaterials: ceramic, metallic, and polymeric nanomaterials. According to the required properties, these materials have been mainly used individually. However, they have sometimes been combined to look at the synergistic effects between different nanomaterials. Nonetheless, these types of nanomaterials have been created for many years using a traditional approach based on intuition. In recent years, researchers have developed new strategies based on the use of high-performance computing technologies (e.g., inverse design) to accelerate the discovery of new nanomaterials for applying in clean energy.

The aim of this Special Issue is to solicit state-of-the-art original research articles and review articles discussing future challenges in developing ceramic, metallic, and polymeric nanomaterials in clean energy. Submissions discussing the fabrication of nanomaterials and their applications in renewable and nuclear energy, carbon capture, thermal and electrical energy storage, and fuel cells are particularly encouraged.

Potential topics include but are not limited to the following:

• Synthesis and characterisation of ceramic, metal, and polymer nanomaterials
• Synthesis, modification, and characterisation of nanomaterials for the development of nanofilters
• Nanomaterials for nuclear energy applications
• Nanomaterials for carbon capture
• Nanostructured ceramic, polymer, and polymer/ceramic hybrid coatings for corrosion, and biofouling protection
• Nanomaterials for applications in fuel cells
• Nanomaterials applied in thermal and electrical storage
• Nanocomposites for energy applications
• Modelling and simulation of nanostructured materials
• Inverse design of nanomaterials