Abstract
This paper presents a new sponge-like electrode (SLE) material structured with porous gold (PG). The fabrication process is simple and no specific equipment is required. Notably, the use of liquid metal particles enables the direct growth of PG into the pores of a flexible conductive support matrix. With a SLE sample 13 mm long, 6 mm wide and 1.5 mm thick immersed in a 10 mM glucose solution, we demonstrate that a volumetric power density of 2.4 mW·cm−3 at ≈5 mA·cm−3 and 0.48 V can be reached without using any enzymes. Because the process presented is versatile and scalable, we envision SLEs with long-term stability that could to meet the power budget of various wearable/bioelectronic devices.
Highlights
Considering the ever increasing demand for thin, lightweight and compliant electronic systems, recent research efforts have been made to develop correspondingly miniature power sources [1]
The measure was repeated later with the gray SP covered with the Galistan particles (GPs)
A distinctive feature of the new fabrication method presented in this paper is that porous gold (PG) can be grown onto flexible porous support matrices
Summary
Considering the ever increasing demand for thin, lightweight and compliant electronic systems, recent research efforts have been made to develop correspondingly miniature power sources [1]. For healthcare and/or biomedical related applications, bioelectrochemical energy sources are an attractive option. Efforts in this field, have predominantly focused on the development of enzyme-based configurations. Porous gold (PG) appears as a promising option for developing new electrodes featuring longer term stability. The hydrogen assisted electrodeposition technique (HAET) is one of the fastest and most affordable methods recently discussed to fabricate PG electrodes [4]. Most works that discussed the HAET, reported PG predominantly grown on rather thick/solid underlying substrates (e.g., gold disk electrodes). We report an alternative facile, fast and low-cost fabrication technique that can be used to grow PG of flexible porous conductive matrices in order to obtain a sponge-like electrode (SLE) material that can catalyze glucose oxidation
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