Qiu Meijia, Sun Peng, Cui Guofeng, Tong Yexiang, Mai Wenjie
MOE Laboratory of Bioinorganic and Synthetic Chemistry, Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education, The Key Lab of Low-Carbon Chemistry and Energy Conservation of Guangdong Province, School of Chemistry , Sun Yat-sen University , Guangzhou 510275 , P.R. China.
Siyuan Laboratory, Guangdong Provincial Engineering Technology Research Center of Vacuum Coating Technologies and New Energy Materials, Department of Physics , Jinan University , Guangzhou 510632 , P.R. China.
ACS Nano. 2019 Jul 23;13(7):8246-8255. doi: 10.1021/acsnano.9b03603. Epub 2019 Jun 25.
With the rapid advancement in different kinds of portable electronics, self-powered systems with small volume and high-performance characteristics have attracted great attention in recent years. It would be rather exciting if one integrated system can not only convert recyclable energy or waste to electricity but also store energy at the same time. Here, flexible all-in-one energy chips composed of urea-based photocatalytic fuel cells (PFCs) and asymmetric microsupercapacitors (AMSCs) are designed on the same plane for powering small portable electronics. The planar PFC consisting of TiO photoanode and Ag counter electrode, utilizing urea as fuel, can produce a stable energy output (highest power density of 3.04 μW cm in 1 M urea solution under a UV intensity of 30 mW cm) while purify this wasted water simultaneously. Besides, the AMSC comprised of NiCoP@NiOOH positive electrode and zeolite imidazolide framework derived carbon (ZIF-C) negative electrode achieves a high areal capacitance of 54.7 mF cm at 0.5 mA cm and an excellent energy density of 13.9 μWh cm at the power density of 270.5 μW cm. Its stability can be confirmed by 86% capacitance retention after 8000 electrochemical cycles and almost no decay after 500 bending cycles. Four PFCs and two AMSCs can be easily constructed into an energy chip and power small electronics. This eco-friendly and self-sustainable system has great potential in future portable electronics.
随着各类便携式电子产品的迅速发展，近年来，具有小体积和高性能特点的自供电系统备受关注。如果一个集成系统不仅能够将可回收能源或废物转化为电能，同时还能储存能量，那将是相当令人兴奋的。在此，由基于尿素的光催化燃料电池（PFC）和不对称微型超级电容器（AMSC）组成的柔性一体化能量芯片在同一平面上设计而成，用于为小型便携式电子产品供电。由TiO光阳极和Ag对电极组成的平面PFC，以尿素为燃料，在30 mW cm的紫外光强度下，于1 M尿素溶液中可产生稳定的能量输出（最高功率密度为3.04 μW cm），同时净化这种废水。此外，由NiCoP@NiOOH正极和沸石咪唑酯骨架衍生碳（ZIF-C）负极组成的AMSC，在0.5 mA cm下实现了54.7 mF cm的高面积电容，在270.5 μW cm的功率密度下具有13.9 μWh cm的优异能量密度。其稳定性可通过8000次电化学循环后电容保持率为86%以及500次弯曲循环后几乎无衰减来证实。四个PFC和两个AMSC可轻松构建成一个能量芯片并为小型电子产品供电。这种环保且自我可持续的系统在未来便携式电子产品中具有巨大潜力。
