Our research goal is to realize renewable energy innovations and contribute to global environmental sustainability through nanotechnology and nanoscience of advanced functional materials research. Using environmentally friendly materials processing and the exploration of advanced functional nanomaterials, the Honma laboratory investigates the frontiers of nanotechnology and nanomaterials for CO2 electrochemical conversion processes to useful compounds, all solid state batteries, critical-metal free battery, processing of functional nanomaterials and on-demand fabrication of battery devices by 3D printing technologies, thereby contributing to innovative solutions for global sustainability, renewable energy, and for a low carbon emission society. Our fundamental research is focused on advanced functional nanomaterials such as monoatomic layered materials, nanoparticles, nanoporous materials, multi-ternary compounds, metastable materials, organic molecular electrodes, novel inorganic electrolytes for all solid-state batteries, supercritical fluid & hydrothermal-electrochemical processing of advanced functional materials, and operando spectroscopy analysis for all solid state batteries using synchrotron light sources.