Systems and methods for high-rate electrochemical arsine generation

A gas generator comprising:

• a shell having a top interior surface and a bottom interior surface opposite the top interior surface;
• and
• a cathode-anode assembly horizontally positioned in the shell and forming an elongated structure substantially parallel to the top interior surface and the bottom interior surface, the cathode-anode assembly comprising:
• a first electrode;
• and
• a second electrode surrounding the first electrode and forming a gap between the second electrode and the first electrode, the second electrode including a plurality of channels along a length of the second electrode, one or more first channels of the plurality of channels being open towards the top interior surface of the shell,
• wherein the first electrode is a cathode and comprises an outer layer formed of elemental arsenic and a core formed of a metallic material, and wherein the second electrode is an anode, and
• wherein the plurality of channels allow circulation of electrolyte within and around at least a portion of the cathode-anode assembly, and the one or more first channels allow gases, generated in response to current applied to the cathode-anode assembly and directed towards the one or more first channels, to escape from the cathode-anode assembly.