“…As many materials cannot currently be processed directly into 3D bicontinuous microarchitectures by means of printing or lithographic processes, 3D printed polymer frameworks as structure-directing supports and sacrificial templates are utilised here. 21,22,23 Until recently, choice of templates was limited, and synthetic opals were often used as templates to create structured scaffolds of solid electrolytes 24 and electrodes 25,26 . Now, the advent of 3D printing and stereolithography permits, in principle, the controlled design and formation of a diverse range of precise microarchitectures.…”