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Puzzle-inspired carbon dots coupled with cobalt phosphide for constructing a highly-effective overall water splitting interface.

Inspired by the structure of puzzles, bombyx mori silk-derived carbon dots (CDs) with abundant negative groups, as jigsaw pieces, were combined with nano-CoP to create a highly effective electrocatalytic interface. The hollow cavity and thin wall of the bamboo-like CDs/CoP nanoarray is beneficial to produce more H˙ radicals and accelerate water decomposition.