Multifunctional MOF-derived Au, Co-doped porous Carbon Electrode for Wearable Sweat Energy Harvesting-storage Hybrid System.

As an efficient alternative for harnessing the energy from human's biofluid, the wearable energy harvesting-storage hybrid supercapacitor-biofuel cell (SC-BFC) microfluidic system is established with one multifunctional electrode. The electrode integrates the metal-organic framework (MOF) derived carbon nanoarrays with embedded Au, Co nanoparticles on the flexible substrate, and is used for symmetric supercapacitor as well as enzyme nanocarriers of biofuel cell. The electrochemical performance of the proposed electrode is evaluated, and the corresponding working mechanism is studied in depth according to the cyclic voltammetry and density functional theory calculation. The multiplexed microfluidic system is designed to pump and store natural sweat to maintain the continuous biofuel supply in hybrid SC-BFC system. The biofuel cell module harvests the electricity from lactate in sweat, and symmetric supercapacitor module to accommodate the bioelectricity for subsequent utilization. W e develop a numerical model to validate the normal operation in poor and rich sweat under variable situations for microfluidic system. One single SC-BFC unit can be self-charged to ∼0.8 V with superior mechanical durability in on-body testing, as well as the energy and power value of 7.2 mJ and 80.3 μW, respectively. It illustrates the promising scenery of energy harvesting-storage hybrid microfluidic system. This article is protected by copyright. All rights reserved.