This book provides an overview of pseudocapacitive materials, including their fundamentals, synthetic methods, architectural enhancements to boost their properties, and emerging materials. It covers numerous strategies to enhance their performance, such as altering morphology, doping, introducing multivalent ions, designing devices, and utilizing emerging pseudocapacitive materials. The book also delves into fundamental approaches for fine-tuning the properties of pseudocapacitive materials and explores their applications in energy storage devices, with a specific focus on emerging pseudocapacitive materials and their utilization in energy storage devices.