Transient electrode coatings, including (A) PEG, (B) gelatin, (C) PVA/PLGA, (D) silk, (E) sucrose, (F) CMC, (G) tyrosine-derived polycarbonate E5005(2 K), and (H) maltose. Images reproduced with permission from [118] (Copyright IOP, 2015) [119], (Copyright, Frontiers Media SA, 2015) [120], (Copyright, IOP, 2018) [121], (Copyright, Wiley, 2018) [122], (Copyright, Wiley, 2009) [123], (Copyright, Elsevier, 2016) [124], (Copyright, Springer 2015), and [93] (Copyright, IOP, 2014).