The increase in global energy demand, together with a rise in carbon dioxide (CO₂) levels have encouraged research into the reduction of CO₂ into useful chemicals and fuels. In this paper, we demonstrate the piezo-catalytic reduction of CO₂ using lead-free lithium-doped potassium sodium niobate (KNN) ferroelectric ceramic particulates. The application of acoustic waves generated by ultrasound to a suspension of the ceramics particles creates pressure waves result in a large change in the spontaneous polarisation of the KNN particles via the piezoelectric effect, which in turn creates surfaces charges for CO₂ reduction. The effect of CO₂ gas concentration, the presence of dissolved species, and catalyst loading on piezo-catalytic performance are explored. By optimization of the piezo-catalytic effect, a promising piezo-catalytic CO₂ reduction rate of 438 μmol g⁻¹ h⁻¹ is achieved, which is much larger than the those obtained from pyro-catalytic effects. This efficient and polarisation tuneable piezo-catalytic route has potential to promote the development of CO₂ reduction via the utilisation of vibrational energy for environmental benefit.

全球能源需求的增加，以及二氧化碳 (CO ₂ ) 水平的上升，促进了将 CO ₂还原为有用化学品和燃料的研究。在本文中，我们展示了使用无铅锂掺杂铌酸钾钠 (KNN) 铁电陶瓷颗粒的压电催化还原 CO _{2 。}将超声波产生的声波施加到陶瓷颗粒的悬浮液中会产生压力波，从而通过压电效应导致 KNN 颗粒的自发极化发生巨大变化，进而产生用于 CO ₂还原的表面电荷。CO _2的影响研究了气体浓度、溶解物质的存在和催化剂负载对压电催化性能的影响。通过优化压电催化效应，实现了有希望的 438 μmol g ^-1 h ^{-1的压电催化 CO} ₂还原率，远大于热催化效应。这种高效且极化可调的压电催化途径具有通过利用振动能促进CO _{2还原的发展以造福环境。}