A Carbon-Negative Hydrogen Production Strategy: CO 2 Selective Capture with H 2 Production.

We reported a strategy of carbon-negative H production in which CO capture was coupled with H evolution at ambient temperature and pressure. For this purpose, carbonate-type Cu Mg Fe layered double hydroxide (LDH) was preciously constructed, and then a photocatalysis reaction of interlayer CO reduction with glycerol oxidation was performed as driving force to induce the electron storage on LDH layers. With the participation of pre-stored electrons, CO was captured to recover interlayer CO in presence of H O, accompanied with equivalent H production. During photocatalysis reaction, Cu Mg Fe exhibited a decent CO evolution amount of 1.63 mmol g and dihydroxyacetone yield of 3.81 mmol g . In carbon-negative H production process, it showed an exciting CO capture quantity of 1.61 mmol g and H yield of 1.44 mmol g . Besides, this system possessed stable operation capability under simulated flu gas condition with negligible performance loss, exhibiting application prospect.