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The text is an editorial from the Journal of Materials Science discussing a cover paper titled "High-performance, water-resistant and ion-conducting gel used as underwater ECG electrodes" by Shi et al. The paper addresses the challenges of sensing underwater and describes the synthesis and characterization of a single-layer hydrogel electrode that is resistant to swelling in water. The paper is accessible to non-experts and includes photographs, curves, and electrocardiograms to support the findings. Although the article is not open access, it can be accessed through a SharedIt link provided by the publisher. [Extracted from the article]

A droplet forming microfluidic chip was used to create droplets of precisely controlled size that contained a photocurable monomer as well as nanoparticles of magnetite and manganese dioxide. Manganese dioxide nanoparticles were shown to be effective for decomposing hydrogen peroxide to form oxygen bubbles that provided propulsion, which increased the rate of methylene blue decomposition by the magnetite nanoparticles through enhanced mixing. Dissolving the alginate fiber released the microparticles that contain base-metal catalysts for both the decomposition of hydrogen peroxide, and methylene blue, a common water contaminant [[2]]. [Extracted from the article]