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A friction layer with stability and durability is important to promote the practical application of triboelectric nanogenerators (TENGs). In this work, a two‐dimensional cobalt coordination polymer (Co‐CP) was successfully synthesized using cobalt nitrate, 4,4′,4′′‐tricarboxyltriphenylamine and 2,2′‐bipyridine. To clearly clarify the effect of the doping proportions of Co‐CP and the types of composite...