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Biomass‐based hydrogels have attracted great attention in flexible and sustainable self‐powered power sources but struggled to fabricate in a green, high‐efficiency, and low‐cost manner. Herein, a novel and facile alkali‐polyphenol synergetic self‐catalysis system is originally employed for the fast gelation of self‐healable and self‐adhesive lignin‐based conductive hydrogels, which can be regarded...