L. Wu, Y. Kang, X.Y. Shi,* E.D. Yang, J.X. Ma, X.F. Zhang, S.H. Wang, Z.-S. Wu*

ACS Nano, 2023, 17.

DOI: 10.1021/acsnano.3c06442 [PDF]

The biodegradable and biocompatible microscale energy storage devices are highly crucial for environmentally friendly microelectronics and implantable medical application. Herein, a biodegradable and biocompatible micro-supercapacitor (BB-MSC) with satisfying overall performance is realized via the combination of 3D printing technique and biodegradable materials. Due to the 3D-interconnected structure of electrodes and elaborated design of electrolyte, the as-prepared BB-MSC exhibits superior overall performance than most of biodegradable devices, including a wide operation voltage of 1.8 V, high areal specific capacitance of 251 mF/cm2, good cycle stability, and favorable low-temperature resistance (-20 ℃), demonstrative of reliability and practicality of our devices even in frosty environments. Importantly, the smooth degradation has been realized for the BB-MSC after buried in natural soil for approximately 90 days, and its implantation does not affect the healthy status of SD rats. Therefore, this work explores the avenues for the design and construction of environmentally friendly and biocompatible microscale energy storage devices.