This book embarks on an illuminating journey into the remarkable world of nitrogen-doped graphene (N-G) with this comprehensive exploration. Part I lays the foundation, unraveling the physical and chemical intricacies of N-G, from structures and properties to synthesis methodologies, electrochemical performance, and degradation mechanisms. Seamlessly blending theory and practice, it sets the stage for deeper exploration. Part II delves into the composites of N-G with metal-organic frameworks (MOFs), exploring their unique composition, synthesis methods, and electrochemical activities. This section paints a vivid picture of their potential applications in catalysis, energy storage, sensors, and medical advancements. In Part III, the narrative shifts to the synthesis strategies and performance intricacies of N-G with a diverse spectrum of materials. From metallic substances to non-metallic counterparts and beyond, these chapters unveil a gateway to creating composite materials, sparking possibilities across various domains. Part IV unfolds the transformative impact of N-doped graphene across diverse applications, revolutionizing energy conversion technologies. From fuel cells to batteries, supercapacitors, and beyond, N-G materials emerge as catalysts for innovation, addressing contemporary challenges in water electrolysis, purification, and biomedical applications. This book paints a vibrant picture of N-doped graphene as a catalyst for innovation and a solution to contemporary energy and environmental challenges. Whether you are a researcher, student, or enthusiast, this comprehensive exploration provides profound insights into the multifaceted capabilities and potential applications of N-G materials.