Graphene (for multiple applications) and perovskites (for solar cells) are two very exciting materials that have captured the attention of the scientific community and are being intensively investigated. They could significantly change our current technologies and our society. But apart from these two, there are other very interesting materials somewhat less popular. In this link a list of six materials that could change the world has being composed. Among them you will find aerogels, self-healing polymers, stanene, light manipulators and thermoelectrics.
Regarding the latter class of materials, the company Alphabet Energy has recently fabricated a powerful generator that can be used directly in exhaust pipes. The video above shows all the generator's features and design.
