power source manufacturers and users of the cells described here could potentially commercialize this type of enhanced power source technology improvements in the art provided by the proposed power sources in accordance with the present invention lie within the power energy density output as well as in the environmental friendliness of the systems presented a specific embodiment of the present invention involves the dissolution of a capsule in which a solid has been trapped in is known in the art that dissolvable gelatin capsules can control the release of the material within the capsule as the capsule dissolves such that the release can be made at a rate controlled by using such capsules in a particular embodiment solid sodium peroxide was encapsulated using commercial capsules for a food supplement such as a gelatin capsule fig1 illustrates the results of an exemplary embodiment of the present invention in which a solid sodium peroxide material is encapsulated and then dissolved using a water solution to control the potential output of the electrochemical cell at a constant load in this embodiment the electrochemical includes an aluminum anode and a composite silver carbon cathode a microbial fuel cell mfc or biological fuel cell is a bio electrochemical system that drives a current by mimicking bacterial interactions found in nature in an mfc micro.