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The friction between nanomaterials and Teflon magnetic stirring rods has recently drawn much attention for its role in dye degradation by magnetic stirring in dark. Presently the friction between TiO 2  nanoparticles and magnetic stirring rods in water has been deliberately enhanced and explored. As much as 1.00 g TiO 2  nanoparticles were dispersed in 50 mL water in 100 mL quartz glass reactor, which got gas-closed with about 50 mL air and a Teflon magnetic stirring rod in it. The suspension in the reactor was magnetically stirred in dark. Flammable gases of 22.00 ppm CO, 2.45 ppm CH 4 , and 0.75 ppm H 2  were surprisingly observed after 50 h of magnetic stirring. For reference, only 1.78 ppm CO, 2.17 ppm CH 4 , and 0.33 ppm H 2  were obtained after the same time of magnetic stirring without TiO 2  nanoparticles. Four magnetic stirring rods were simultaneously employed to further enhance the stirring, and as much as 30.04 ppm CO, 2.61 ppm CH 4 , and 8.98 ppm H 2  were produced after 50 h of magnetic stirring. A mechanism for the catalytic role of TiO 2  nanoparticles in producing the flammable gases is established, in which mechanical energy is absorbed through friction by TiO 2  nanoparticles and converted into chemical energy for the reduction of CO 2  and H 2 O. This finding clearly demonstrates a great potential for nanostructured semiconductors to utilize mechanical energy through friction for the production of flammable gases.

Flammable gases produced by TiO2 nanoparticles under magnetic stirring in water