The construction of an efficient and robust catalyst for the electrochemical reduction of carbon dioxide into energy-rich products has recently received considerable attention. Herein, a Cu/TiO₂ nanoparticles modified nitrogen-doped graphene (Cu/TiO₂/NG) carbon material is fabricated for the selective reduction of CO₂ into different alcohols. We found the Cu/TiO₂/NG nanocomposite across a range of potentials for the electroreduction of CO₂ exhibits dual catalytic ability, possessing an outstanding ability to produce methanol (reaching a maximum faradaic efficiency of 19.5% at a potential of −0.20 V vs. the reversible hydrogen electrode (RHE)) and a capability to produce ethanol (with a high faradaic efficiency up to 43.6% at −0.75 V vs. RHE). In addition, the Cu/TiO₂/NG composite shows remarkable stability and reusability at both reductive potentials in the electrochemical process. The designed Cu/TiO₂/NG composite may offer a new simple method based on earth-abundant metals to construct robust electrocatalysts for CO₂ reduction.

近来，用于将二氧化碳电化学还原成能量丰富的产物的高效且坚固的催化剂的构造受到了广泛的关注。本文中，制备了Cu / TiO ₂纳米颗粒改性的氮掺杂石墨烯（Cu / TiO ₂ / NG）碳材料，用于将CO ₂选择性还原成不同的醇。我们发现Cu / TiO ₂ / NG纳米复合材料具有多种电还原CO ₂的潜力具有双重催化能力，具有出色的生产甲醇的能力（在相对于可逆氢电极（RHE）的电位为-0.20 V的情况下，达到最大的法拉第效率为19.5％）和生产乙醇的能力（法拉第效率很高）相对于RHE在-0.75 V时高达43.6％）。此外，在电化学过程中，Cu / TiO ₂ / NG复合材料在两种还原电位下均显示出显着的稳定性和可重复使用性。设计的Cu / TiO ₂ / NG复合材料可以提供一种新的简单方法，该方法基于富含稀土的金属来构建用于还原CO _2的稳健电催化剂。