Abstract: The present aspects of an embodiment make more efficient use of hydrogen on-demand (hereinafter “HoD”) systems, thereby improving fossil-fuel-powered systems on the market. One main aspect uses a disposable cartridge in which the electrolytic process takes place to separate gas molecules from a solution that uses a substantially dry-cell design. Generally, the aspects include a replaceable and reusable cartridge for the flow of electrolyte solution using a pump, which may include a variety of safety features. A HoD cartridge generator has a plurality of staggered conductive material members that require electrolyte solution to flow between them, from one or more inlets to one or more outlets, using one or more specified paths. A conventional or specially-formulated electrolyte solution may be used. One or more sensors allow the generator to have a steady flow of solution in and a steady flow of liquid-gas mixture out of the system.