Lee, Geumbee Kang, Seung-Kyun Won, Sang Min Gutruf, Philipp Jeong, Yu Ra Koo, Jahyun Lee, Sang-Soo Rogers, John A. Ha, Jeong Sook 2024-01-20T00:32:31Z 2024-01-20T00:32:31Z 2021-09-05 2017-09-20 1614-6832 https://pubs.kist.re.kr/handle/201004/122270 In this work, the authors report materials, fabrication strategies, and applications of biodegradable microsupercapacitors (MSCs) built using water-soluble (i.e., physically transient) metal (W, Fe, and Mo) electrodes, a biopolymer, hydrogel electrolyte (agarose gel), and a biodegradable poly(lactic-co-glycolic acid) substrate, encapsulated with polyanhydride. During repetitive charge/discharge cycles, the electrochemical performance of these unusual MSCs is dramatically enhanced, following from the role of pseudocapacitance that originates from metal-oxide coatings generated by electrochemical corrosion at the interface between the water-soluble metal electrode and the hydrogel electrolyte. Systematic studies reveal the dissolution kinetics/behaviors of each individual component of the MSCs, as well as those of the integrated devices. An encapsulation strategy that involves control over the thickness, chemistry, and molecular weight of the constituent materials provides a versatile means to engineer desired functional lifetimes. Demonstration experiments illustrate potential applications of these biodegradable MSCs as transient sources of power in the operation of light-emitting diodes and as charging capacitors in integrated circuits for wireless power harvesting. English WILEY-V C H VERLAG GMBH ELECTROCHEMICAL ENERGY-STORAGE IN-VITRO ASSESSMENT MICRO-SUPERCAPACITORS GEL ELECTROLYTE DEGRADATION KINETICS SILICON ELECTRONICS OXIDE MATERIALS CHARGE STORAGE PURE IRON SOL-GEL Fully Biodegradable Microsupercapacitor for Power Storage in Transient Electronics Article 10.1002/aenm.201700157 1 ADVANCED ENERGY MATERIALS, v.7, no.18 ADVANCED ENERGY MATERIALS 7 18 scie scopus 000411182500018 2-s2.0-85019615131 Chemistry, Physical Energy & Fuels Materials Science, Multidisciplinary Physics, Applied Physics, Condensed Matter Chemistry Energy & Fuels Materials Science Physics Article ELECTROCHEMICAL ENERGY-STORAGE IN-VITRO ASSESSMENT MICRO-SUPERCAPACITORS GEL ELECTROLYTE DEGRADATION KINETICS SILICON ELECTRONICS OXIDE MATERIALS CHARGE STORAGE PURE IRON SOL-GEL biodegradable metals biodegradable materials flexible energy storage devices microsupercapacitors transient electronics