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Interfacial engineering of synergistic catalysts is one of the keys to achieving multiple proton‐coupled electron transfer processes in nitrate‐to‐ammonia conversion. Herein, by joining ultrathin nickel‐based metal–organic framework (denoted Ni‐MOF) nanosheets with few‐layered hydrogen‐substituted graphdiyne‐supported copper single atoms and clusters (denoted HsGDY@Cu), a tandem catalyst of Ni‐MOFs@HsGDY@Cu...
Poly(acrylic acid‐co‐N‐vinylcaprolactam) (PAN) hydrogels containing multiple hydrogen bonds can exhibit pH‐induced reversible dynamic responsive behaviors. When placing a transparent hydrogel in an acid bath, as hydrogen bonds between comonomer units involving protonated COOH groups are formed faster than water diffusion, a nonequilibrium light‐scattering state is formed to turn the hydrogel opaque,...
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