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(a, top) Preparation of the OPV-based PEC electrode with a Co catalyst by “click” chemistry. (a, down) The energy level diagram depicts the relevant energy levels under flat band conditions of all materials used in the photocathode. (b) Chemical structure of Co-N3 (HER4). (c) Transient photocurrent response curves of the OPV photocathodes with and without the Co catalyst. Adapted with permission from ref (231). Copyright 2015 Royal Society of Chemistry.
