Emerging Materials for Environment Protection and Renewable Energy includes most of the published research articles from the editors along with the work of other authors. The central theme of this book is interrelatedness. Each part of this book highlights a work contributing to environmental protection and renewable energy, with the presentation of tables, graphs, and figures. This book considers three major parts: (1) Sensors, (2) Photocatalyst and (3) Renewable Energy; it also provides an in-depth knowledge for the synthesis of nanomaterials, characterization of nanomaterials, and the possibilities for full-scale applications of these nanomaterials for environmental protection and renewable energy. The major three parts of this book are further sub-sectioned into thirty-three chapters, covering the topics of metal oxides based gas sensors (Part I, Section One), zinc oxide based chemical sensors (Part I, Section Two), titanium oxide based chemical sensors (Part I, Section Three), conducting polymers based chemical sensors (Part I, Section Four), zinc oxide based photocatalysts (Part II, Section One), titanium oxide based photocatalysts (Part II, Section Two), conducting polymers based photocatalysts (Part II, Section Three), organic solar cells (Part III, Section One), zinc oxide based DSSCs (Part III, Section Two), titanium oxide based DSSCs (Part III, Section Three) and perovskite solar cells (Part III, Section Four).