NOVELTY - An electrode (122, 124) capable of forming hydrogen gas in the presence of an anionic species comprises: a catalytic material comprising a first metal type selected to be capable of forming hydrogen gas; a second metal type selected to have an association constant of less than 103 M-1 with the anionic species; and a third metal type selected so as to increase the surface area of the catalytic material, where the anionic species is not oxide or hydroxide.    USE - As an electrode for forming hydrogen gas in the presence of an anionic species, useful in an electrolytic device, in a fuel cell or a regenerative fuel cell (claimed).    ADVANTAGE - The catalytic material is selected such that it comprises at least a first metal type, a second metal type, and a third metal type where the second metal type is selected to moderate or eliminate any adverse effects associated with the presence of the anionic species, leading to increased efficiency, stability, and/or output of the electrode comprising the catalytic material as compared to many known electrodes under certain conditions of operation. The electrode comprising the catalytic material is capable of catalytically forming hydrogen gas from water with a Faradaic efficiency of about 50%. The systems comprising the catalytic material operate at improved activity, e.g. at low absolute value of the overpotential, high current density, significant efficiency, and/or stability. The systems also operate at or near neutral pH, without necessarily requiring highly pure water sources. This provides significantly improved energy storage, energy use, and optional commercial production of hydrogen and/or oxygen gases.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) a composition of matter comprising: molybdenum (0.1-90 wt.%); zinc (0.1-90 wt.%); and nickel (0.1-90 wt %);    (2) a catalytic material capable of oxidizing hydrogen gas and/or forming hydrogen gas comprising nickel, molybdenum, and zinc;    (3) a system capable of generating hydrogen and/or oxygen gas comprising: a first electrode comprising cobalt and/or nickel ions, and anionic species comprising phosphorus and/or boron; and a second electrode comprising nickel and molybdenum;    (4) an electrode capable of oxidizing hydrogen gas comprising the a catalytic material comprising a first metal type selected to be capable of oxidizing hydrogen gas; a second metal type; and a third metal type selected so as to increase the surface area of the catalytic material;    (5) a system capable of forming hydrogen and/or oxygen gas comprising: a catalytic material comprising a first metal type selected to be capable of catalyzing the formation hydrogen gas from water, a second metal type, and a third metal type selected so as to increase the surface area of the catalytic material; and a photoactive composition; and    (6) forming hydrogen gas involving either: exposing an electrode comprising a catalytic material to water containing at least one additive and/or at least one impurity, where the pH of the water is 6-10; and causing the formation of hydrogen gas, where hydrogen gas is formed with an absolute value of the overpotential of less than or equal to 0.3 V at a current density of at least about 1 mA/cm2; or involving: exposing an electrode comprising a catalytic material to water containing at least one additive in a concentration of at least 0.1 M and/or at least one impurity in a concentration of at least 1 parts per million (ppm), where the pH of the water is 6-10; and causing the formation of hydrogen gas, where the current density of the electrode decreases by not greater than 10% over a period of 4 hours under essentially constant electrochemical conditions.    DESCRIPTION OF DRAWING(S) - The figure shows a view of a non-limiting example of an electrolytic device.    Power source (120)    First electrode (122)    Second electrode (124)    Electrolyte (126)    Electrons (130)