NOVELTY - Electrochemical energy conversion involves generating electrons and protons in an anode chamber of a fuel cell (14), where anode chamber includes at least one anode (12); transferring electrons from anode chamber to a cathode chamber (18) of fuel cell via external circuit; driving an electrical current through external circuit with a lead or manganese-containing cathode catalyst and at least one cathode in cathode chamber; connecting anode chamber and cathode chamber with at least one proton exchange connector; and generating electrical power.    USE - For electrochemical energy conversion in fuel cell such as hydrogen fuel cell, a microbial fuel cell, an enzyme fuel cell, a biofuel cell, a light fuel cell, and a hybrid fuel cell based on any hydrogen fuel cell, microbial fuel cell, enzyme fuel cell, biofuel cell, or light fuel cell; for remediating hydrogen, enzymes, microorganisms, glucose, sulfur, iron, acetate, wastewater, subsurface contaminants, sulfide, petroleum hydrocarbons, diesel range organics, glucose, sewage sludge, organic compounds, inorganic compounds, gasoline and diesel found in underground environment, a saturated subsurface, an unsaturated subsurface, wastewater, soil, groundwater, sediment, surface water, and petroleum-impacted saturated soils; for generation of waste remediation and energy using multi-purpose in-situ microbial fuel cell functions (claimed).    ADVANTAGE - The method provides improved fuel cell systems which provide faster degradation of contaminant substances in environmental media such as perhaps petroleum hydrocarbon in groundwater with microbial fuel cells; provides improve power generation of microbial fuel cells; and lowering production costs of fuel cells.    DETAILED DESCRIPTION - Electrochemical energy conversion involves generating electrons and protons in an anode chamber of a fuel cell (14), where anode chamber includes at least one anode (12); transferring electrons from anode chamber to a cathode chamber of fuel cell via external circuit; driving an electrical current through external circuit with a lead or manganese-containing cathode catalyst and at least one cathode in cathode chamber (18); connecting anode chamber and cathode chamber with at least one proton exchange connector; and generating electrical power. The method further comprises utilizing ambient air as an oxygen supply in cathode chamber; utilizing electrons transferred from anode chamber to cathode chamber with a cathode electron acceptor; generating electrons and protons in anode chamber involves generating by anaerobic degradation of substances or by oxidation of substances; connecting anode chamber and cathode chamber with at least one proton exchange connector involves connecting anode chamber and cathode chamber with a proton exchange membrane between both chamber, with at least one proton bridge, with a conductive liquid medium between both chambers, connecting multiple anodes in anode chamber to at least one cathode in cathode chamber with multiple proton bridges. INDEPENDENT CLAIMS are included for following:    (1) electrochemical energy conversion device comprising at least one anode; at least one cathode; a lead or manganese-containing cathode catalyst; at least one proton exchange connector between at least one anode and cathode; and an external circuit between anode and cathode providing electrons from anode to cathode; and    (2) double chamber dual acting in-situ microbial fuel cell device for waste remediation and energy generation comprising at least one anode; at least one anaerobic microbial population and at least one contaminant; an open cathode chamber; a proton exchange connector and open cathode chamber to transfer protons from anode of closed anaerobic anode chamber to at least one cathode of open cathode chamber; and an external circuit to create electrical power over a potential difference from closed anaerobic anode chamber and open cathode chamber.    DESCRIPTION OF DRAWING(S) - The figure shows view of fuel cell.    Anode (12)    Anaerobic anode chamber (13)    Fuel cell (14)    Cathode (17)    Cathode chamber (18)