▎ 摘　　要

NOVELTY - Membrane element configured comprises at least one selectively permeable membrane configured to at least partially purify feed water when pressure difference is provided across the membrane. The membrane element includes at least one anode electrode and at least one cathode electrode. USE - Membrane element configured for use in system, and water filtration module for osmotic and gauge pressure driven filtration of water and electrochemical splitting of at least proportion of water for co-generation of hydrogen (all claimed). DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for: 1. a water filtration module configured for pressure driven filtration of water and electrochemical splitting of at least a proportion of the water for the co-generation of hydrogen, which comprises: a feed water inlet, at least one membrane element, a product water outlet, and optionally a reject water outlet; 2. a method for pressure driven water purification with co-generation of hydrogen, which involves: (a) supplying feed water from a feed water inlet to a membrane element or module according to any one of the preceding claims; (b) applying a pressure differential across the selectively permeable membrane of the membrane element to draw feed water through the membrane to form a product water and optionally a reject flow; (c) applying a potential difference between the electrodes of the membrane element to cause electrochemical splitting of at least a portion of at least one of the feed and/or product water for form hydrogen and oxygen, and (d) collecting the product water and optionally a reject flow, and hydrogen; and 3. a system for pressure-driven water purification with the co-generation of hydrogen, which comprises: a feed water inlet, at least one membrane element or module, at least one pump to apply a pressure to the feed water, a power source to provide a potential difference to the electrodes of the membrane element, a product water outlet, and optionally a reject flow outlet, and, a hydrogen outlet within the product and/or reject flow. DESCRIPTION OF DRAWING(S) - The drawing shows a three-dimensional view of the semi-permeable membrane. 5Support layer 6Draw solution stream 8Permeate 9, 10Electrode 11Hydrogen