全生物可降解超级电容器(FBSC)属于瞬态电子学研究范畴，其物理形态和功能在外界触发下会发生完全降解消失，在植入式医疗电子设备等领域具有广阔应用前景。目前国际报道的FBSC电化学性能比常规SC低两个数量级，如何提升FBSC能量密度是当前主要研究热点之一。基于此，本项目拟提出以下研究思路：1）采用氧空位增强机制，改善MoO3薄膜电极导电性、增强电化学反应动力学行为，显著提高FBSC能量密度；2）全部选用生物可降解材料，以蚕丝蛋白纤维布为衬底、MoO3为赝电容物质，采用物理气相沉积工艺路线构筑MoO3薄膜基FBSC器件；3）详细研究富含氧空位MoO3薄膜的生物降解行为，实现FBSC器件可控降解。通过对MoO3薄膜沉积工艺系统研究，重点解决氧空位类型/浓度调制半导体薄膜导电性的规律与机制、增强电化学反应动力学行为机制两个科学问题。本项目的实施将为高能量密度FBSC的设计提供实验依据和理论基础。

Fully biodegradable supercapacitor (FBSC) belongs to the research field of transient electronics. Due to its excellent response in terms of physical form and function upon triggering, FBSC has bright future in many applications such as implantable medical electronics. At present, the energy density of FBSC is two orders of magnitude lower than that of conventional supercapacitor (SC). Therefore, developing strategy to enhance the energy density of FBSC is the key to their future applications. Based on this, we propose the following research routes to approach this goal. First, we propose to utilize the advantages of oxygen vacancy defects in improving the electrical conductivity and electrochemical reaction kinetics of MoO3 films, and boost the energy density in FBSC devices as a result. Second, we propose to choose fully biodegradable materials during device fabrication. Specifically, the pseudocapacitive MoO3 semiconductor films are prepared on the silk protein fiber cloth through physical vapor deposition. Third, the biodegradation behavior of the pseudocapacitive MoO3 films with rich oxygen vacancy defects is investigated in detail to realize the controllable degradation of FBSC devices. Through the systematic investigation on the film fabrication process, we hopefully address two fundamental issues related to oxygen vacancy defects. One is the modulation mechanism of electrical conductivity for MoO3 films, the other is the enhancement mechanism regarding on the electrochemical reaction kinetics of MoO3 electrodes. As such, the proposed project can provide a guideline for the design of FBSC with high energy density, both scientifically and practically.