Biofuel Cells: The Design and Application of Biological Catalysts presents a detailed examination of biofuel cells, from their fundamentals and basic principles through to the latest technological, materials, and bioengineering developments. Chapters 1 and 2 provide a detailed review of the fundamentals and basic principles of microbial and biofuel cells, including the electrochemistry, materials and mechanics, and applications. Chapter 3 provides an in-depth examination of catalyst evolution and chapter 4 explains all aspects of electron transfer in enzymatic biofuel cells. Chapter 5 reviews all types of hybrid biofuel cell, including fabrication and design strategies for thermoelectric and triboelectric energy devices. In chapter 6, advanced manufacture techniques for biofuel cells and bio-devices are explained, including the working principles and methodologies for printing, microfluidics, fiber, microneedle, and others. Finally, chapter 7 explores the diverse applications of biofuel cells and bio-devices, from biosensors and bioelectronics to capacitive biofuel cells. Chapters are supported by computational tools, working manuals for the techniques discussed, and detailed schematics and flowcharts for BCF fabrication.