Electrochemical CO₂ reduction (CO₂R) to value-added fuels has been actively pursued to reduce the carbon intensity of our energy and products-driven economy. Conventional CO₂R is always coupled with the anodic oxygen evolution reaction (OER), resulting in high electricity input being consumed by the OER due to its large energy barrier and sluggish kinetics. Herein, OER is replaced with selective methanol oxidation reaction (MOR) on non-noble electrocatalysts. In an integrated cell, CO₂R is conducted on the cathode of Bi nanoparticles and MOR is performed on the anode of Ni(OH)₂ in alkaline electrolyte. Over 92% selectivity for cathodic reduction of CO₂ into formate and 100% selectivity for anodic oxidation of methanol to formate are achieved at high current densities within a wide potential range. The use of the integrated system significantly lowers the specific energy consumption by 57.3% reduction for individual CO₂R and 71.2% reduction for individual MOR for 1 mol formate generation. This novel strategy for concurrent formate generation at the cathode and anode dramatically increases the valuable fuels production with low electricity consumption. This study thus highlights the promise that coupling CO₂R with viable alternative oxidation reaction is theoretically and technically feasible and presents significant economic benefits.

为了降低能源和产品驱动型经济的碳强度，人们一直积极地追求将化学CO ₂还原（CO ₂ R）用作增值燃料。常规的CO ₂ R总是与阳极氧放出反应（OER）耦合，由于OER的能量垒大且动力学缓慢，导致OER消耗大量电。在此，OER被非贵金属电催化剂上的选择性甲醇氧化反应（MOR）取代。在集成电池中，CO ₂ R在Bi纳米颗粒的阴极上进行，而MOR在碱性电解质中的Ni（OH）₂阳极上进行。阴极还原CO _2的选择性超过92％在宽电位范围内的高电流密度下，甲醇转化为甲酸，甲醇阳极氧化成甲酸的选择性为100％。集成系统的使用显着降低了单位能耗，即生成1 mol甲酸的CO ₂ R降低了57.3％，MOR降低了71.2％。这种在阴极和阳极同时生成甲酸的新颖策略极大地提高了低耗电量的有价值的燃料生产。因此，这项研究突出了这样的希望：将CO ₂ R与可行的替代氧化反应偶联在理论上和技术上都是可行的，并具有可观的经济效益。