Ternary Sn‐Ti‐O Electrocatalyst Boosts the Stability and Energy Efficiency of CO 2 Reduction Academic Article uri icon

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abstract

  • Simultaneously improving energy efficiency (EE) and material stability in electrochemical CO2 conversion remains an unsolved challenge. Among a series of ternary Sn-Ti-O electrocatalysts, 3D ordered mesoporous (3DOM) Sn0.3 Ti0.7 O2 achieves a trade-off between active-site exposure and structural stability, demonstrating up to 71.5 % half-cell EE over 200 hours, and a 94.5 % Faradaic efficiency for CO at an overpotential as low as 430 mV. DFT and X-ray absorption fine structure analyses reveal an electron density reconfiguration in the Sn-Ti-O system. A downshift of the orbital band center of Sn and a charge depletion of Ti collectively facilitate the dissociative adsorption of the desired intermediate COOH* for CO formation. It is also beneficial in maintaining a local alkaline environment to suppress H2 and formate formation, and in stabilizing oxygen atoms to prolong durability. These findings provide a new strategy in materials design for efficient CO2 conversion and beyond.

authors

  • Wen, Guobin
  • Ren, Bohua
  • Park, Moon G
  • Yang, Jie
  • Dou, Haozhen
  • Zhang, Zhen
  • Deng, Ya‐Ping
  • Bai, Zhengyu
  • Yang, Lin
  • Gostick, Jeff
  • Botton, Gianluigi
  • Hu, Yongfeng
  • Chen, Zhongwei

publication date

  • July 27, 2020