NOVELTY - Electrochemical cell (10) comprises: fuel electrode comprising metal fuel; oxidant electrode (14) spaced from fuel electrode; ionically conductive medium for conducting ions between the fuel and oxidant electrodes to support electrochemical reactions at fuel and oxidant electrodes; and catch tray positioned to be contacted by particulates of metal fuel separating from fuel electrode, where fuel electrode and oxidant electrode are configured to, during discharge, oxidize metal fuel at the fuel electrode and reduce an oxidant at oxidant electrode.    USE - Used as electrochemical cell.    ADVANTAGE - The electrochemical cell: exhibits improved efficiency by providing a more even distribution of the particulates across the surface of the fuel electrode; prevents a congestion of the precipitates in the ionically conductive medium, or the waste of electrically disconnected fuel and/or additives and retain the capacity and performance of the cell; reversibly reduces the reaction by-product generated during discharge mode and electrodeposits as the fuel during recharge; and can be use where the reducible fuel species is different from the reaction by-product and is supplied separately.    DETAILED DESCRIPTION - Electrochemical cell (10) comprises: a fuel electrode comprising a metal fuel; an oxidant electrode (14) spaced from the fuel electrode; an ionically conductive medium for conducting ions between the fuel and oxidant electrodes to support electrochemical reactions at the fuel and oxidant electrodes; and a catch tray positioned to be contacted by particulates of the metal fuel separating from the fuel electrode, where the fuel electrode and the oxidant electrode are configured to, during discharge, oxidize the metal fuel at the fuel electrode and reduce an oxidant at the oxidant electrode to generate a discharge potential difference between them for application to a load, and the catch tray comprises a catalyst material for catalyzing, locally at the catch tray, oxidation of particulates of the metal fuel contacting the catch tray, and reduction of cations in the ionically conductive medium.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of electrical connections between the electrochemical cell and an external load and a power supply.    Electrochemical cell (10)    Permeable electrode bodies (12a-12c)    Oxidant electrode (14)    Electrode holder (16)    Switch (60)