Electrochemical reduction and photocatalytic reduction of CO₂ have attracted more and more attention, but they also face the problem of low utilization efficiency of electricity and solar energy. In this study, a new strategy of applying a novel Al–Sn-CNTs composite in electrochemical corrosion process was proposed to reduce CO₂ without additional electricity and light. In the Al–Sn-CNTs/CO₂ system, micro galvanic cell with Al as anode and Sn or CNTs as cathode was formed, and CO₂ was reduced to formic acid on the cathode surface. The cumulative formic acid concentration of the Al–Sn-CNTs/CO₂ system achieved 21.18 mg/L within 60 min under the conditions of initial pH 9.0, Cl⁻ concentration 10 mmol/L, and Al–Sn-CNTs composite dosage 2 g/L. Based on the morphology, crystal structure and electrochemical test results of the Al–Sn-CNTs composite, a possible mechanism of CO₂ reduction to formic acid in the Al–Sn-CNTs/CO₂ system was proposed.

CO _{2 的}电化学还原和光催化还原越来越受到关注，但也面临着电能和太阳能利用效率低的问题。在这项研究中，提出了一种在电化学腐蚀过程中应用新型 Al-Sn-CNTs 复合材料的新策略，以减少 CO ₂而不需要额外的电力和光。在Al-Sn-CNTs/CO ₂体系中，形成了以Al为阳极，以Sn或CNTs为阴极的微型原电池，CO ₂在阴极表面被还原为甲酸。Al-Sn-CNTs/CO ₂体系的累积甲酸浓度在初始 pH 9.0、Cl ^-条件下在 60 分钟内达到 21.18 mg/L浓度为 10 mmol/L，Al-Sn-CNTs 复合剂量为 2 g/L。基于Al-Sn-CNTs复合材料的形貌、晶体结构和电化学测试结果，提出了Al-Sn-CNTs/CO ₂体系中CO ₂还原为甲酸的可能机制。