Abstract: According to one aspect, a power storage system may include an enclosure, and one or more modules disposed in the enclosure. Each of the one or more modules may include a plurality of electrochemical cells electrically coupled to one another, each one of the plurality of electrochemical cells including an oxygen evolution electrode (OEE), an anode, a gas diffusion electrode (GDE), an electrolyte, and a vessel and, within the vessel, the OEE, the anode, and the GDE at least partially immersed in the electrolyte.

Abstract: According to an aspect, an electrochemical cell may include a vessel, at least two instances of an anode assembly, at least two instances of an oxygen evolution electrode (OEE), and a gas diffusion electrode (GDE). In the vessel, the GDE may be disposed between mirrored arrangements of the at least two instances of the OEE and the at least two instances of the anode assembly.

Abstract: A provider of content may provide access to portions of content from a source, but not the source content in its entirety. In some embodiments, one or more access rules or criteria may be implemented that enable users to access portions of the source content up to an allowed limit or threshold (e.g., number or percentage of pages), after which access is prevented to the remaining content that has not previously been accessed. In other embodiments, one or more access rules or criteria may be implemented that enable users to access portions of content of only a certain type (e.g., index, bibliography, introduction, certain chapters, etc.). Unauthorized portions are suppressed or access to them is denied. The content source may be a textual work, an audio work, or a video work of any form. For example, the content may be in electronic form, such as images of pages of content.