Biocompatible and biodegradable energy harvesters are of significance for biomedical application as an alternative energy source without causing adverse effects to the human body. Intrinsically biocompatible diphenylalanine peptides with good piezoelectric, dielectric, and mechanical properties are promising materials for energy conversion. Herein, we report a degradable piezoelectric nanogenerator (PENG) based on a free-standing polylactic acid film with embedded diphenylalanine microrods arrays. The stiff polylactic acid polymer can remove stiff microrods from rigid silicon substrate and transfer uniformly external forces to them for energy conversion. The PENG produces a maximal output voltage of 1.78 V and a power density of 1.56 W m⁻³. Furthermore, the device exhibits full dissolution in alkaline solution, acidic solution and phosphate-buffered saline solution after 25 days at 60 ℃. The degradable PENG provides a viable solution to power transient electronics and reduce the environmental footprint of devices.

生物相容性和可生物降解的能量收集器作为替代能源对生物医学应用具有重要意义，并且不会对人体造成不利影响。具有良好压电、介电和机械性能的固有生物相容性二苯丙氨酸肽是有前途的能量转换材料。在此，我们报告了一种基于具有嵌入式二苯丙氨酸微棒阵列的独立聚乳酸薄膜的可降解压电纳米发电机 (PENG)。刚性聚乳酸聚合物可以从刚性硅基板上去除刚性微棒，并将外力均匀地传递给它们以进行能量转换。PENG 产生的最大输出电压为 1.78 V，功率密度为 1.56 W m ^-3. 此外，该装置在 60 ℃ 25 天后在碱性溶液、酸性溶液和磷酸盐缓冲盐溶液中完全溶解。可降解 PENG 提供了一种可行的解决方案，可为瞬态电子设备供电并减少设备对环境的影响。