Dual-Functional Copper Metal-Organic Frameworks through Reversible Valence Transformation for Self-Powered Photocatalytic Detoxification of a Sulfur Mustard Simulant.

The design and fabrication of dual-function molecular materials that integrate triboelectric performance with photocatalytic activity represent a promising method to achieve selective self-powered detoxification of chemical warfare agents (CWAs). Herein, we developed a feasible and controllable strategy for the same by coalescing isomorphic metal-organic frameworks (MOFs) with different central metal valence states as photocatalysts and triboelectric layers to construct a self-powered photocatalytic detoxification system with triboelectric nanogenerators (TENGs) as a power source. An anionic framework Cu-MOF () underwent a reversible valence conversion, forming a topologically equivalent isomorphic and neutral mixed-valent framework CuCu-MOF () via a single-crystal-to-single-crystal (SC-SC) redox process. -TENG exhibited higher outputs than -TENG. Considering the reversible valence change and atmospheric responsiveness of the two frameworks, the outputs of the respective TENGs were evaluated under different atmospheric conditions. The outputs of -TENG were significantly influenced by the atmospheric conditions, decreasing as the oxygen (O) concentration gradually increased, while those of -TENG remained unchanged. Notably, the maximal output of -TENG exhibited outstanding durability, enabling it to power white light-emitting diodes (LEDs) directly. These LEDs served as the visible-light source to promote the photocatalytic degradation of the sulfur mustard simulant 2-chloroethyl ethyl sulfide, using as the photocatalyst.