The conversion of CO₂ to value-added chemicals represents an attractive approach for CO₂ utilization. Formate and methanol are sustainably valuable fuels and chemical feedstocks. However, the CO₂ reduction reaction (CO₂RR) suffers from unsatisfactory activity, low faradaic efficiency (FE) and inadequate durability. In this study, ultrathin bismuth nanosheets (NSs) and Bi NSs grown on nitrogen-doped ordered mesoporous carbon (OMC-N) are prepared from in situ transformation of atomic-thick Bi₂O₂Se and Bi₂O₂Se/OMC-N. Bi NSs enable efficient formate production with a large current density (51 mA cm⁻² at −1.0 V_RHE) and excellent selectivity (FE ≈ 90%). Interestingly, Bi NSs/OMC-N catalyzes the conversion of CO₂ to formate and methanol simultaneously with maximum FE_formate (70%) and FE_methanol (67%), and long-term stability (35 h). The composition produces 9.15 and 8.00 μmol cm⁻² h⁻¹ for formate and methanol at −0.67 V_RHE, respectively, and methyl formate could be further prepared from the above products. Moreover, the generated Bi NSs achieve 288 mA cm⁻² at −0.61 V_RHE within a flow cell. Theoretical studies reveal that the activity for methanol is rationalized as the outcome of abundant pyridinic-N sites that stabilize the *COOH intermediate. Our study unveils the potential of hierarchical Bi NSs/OMC-N for an efficient and stable CO₂RR to produce chemical feedstocks.

中文翻译：

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氮掺杂碳上原位生长的铋纳米片上的CO2转化为化学原料

CO ₂向增值化学品的转化代表了一种有吸引力的CO ₂利用方法。甲酸盐和甲醇是具有可持续价值的燃料和化学原料。但是，CO ₂还原反应（CO ₂ RR）的活性不理想，法拉第效率（FE）低，并且耐久性不足。在这项研究中，通过原位原子级Bi ₂ O ₂ Se和Bi ₂ O ₂ Se / OMC-的原位转变制备了在氮掺杂有序介孔碳（OMC-N）上生长的超薄铋纳米片（NSs）和Bi NSs。N. Bi NS能够以大电流密度（51 mA cm）有效地生成甲酸盐在-1.0 V _RHE时为^-2）和出色的选择性（FE≈90％）。有趣的是，Bi NSs / OMC-N催化了CO ₂转化为甲酸和甲醇，同时具有最大的FE_甲酸（70％）和FE_甲醇（67％）以及长期稳定性（35 h）。该组合物在-0.67V _RHE下分别产生甲酸和甲醇的9.15和8.00μmolcm ^-2 h ^-1，并且可以由上述产物进一步制备甲酸甲酯。此外，在-0.61 V _RHE时，生成的Bi NSs达到288 mA cm ^-2在流通池中。理论研究表明，甲醇的活性被合理化为稳定* COOH中间体的大量吡啶N位的结果。我们的研究揭示了分层Bi NSs / OMC-N对于高效稳定CO ₂ RR生产化学原料的潜力。