Abstract
AbstractSluggish CO2reduction/evolution kinetics at cathodes seriously impede the realistic applications of Li–CO2batteries. Herein, synergistic photoelectric effect and plasmonic interaction are introduced to accelerate CO2reduction/evolution reactions by designing a silver nanoparticle‐decorated titanium dioxide nanotube array cathode. The incident light excites energetic photoelectrons/holes in titanium dioxide to overcome reaction barriers, and induces the intensified electric field around silver nanoparticles to enable effective separation/transfer of photogenerated carriers and a thermodynamically favorable reaction pathway. The resulting Li–CO2battery demonstrates ultra‐low charge voltage of 2.86 V at 0.10 mA cm−2, good cycling stability with 86.9 % round‐trip efficiency after 100 cycles, and high rate capability at 2.0 mA cm−2. This work offers guidance on rational cathode design for advanced Li–CO2batteries and beyond.
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