Coupling Value-Added Methanol Oxidation with CO<sub>2</sub> Electrolysis by Low-Coordinated Atomic Ni Sites
Kang Lian, Sanshuang Gao, Wenxian Liu, Qian Liu, Yanhong Feng, Jun Luo, Guangzhi Hu, Ke Chu, Dingsheng Wang, Xijun Liu
Abstract
The combination of CO 2 fixation and small organic molecule oxidation offers a promising solution to increasing severe environmental issues and energy crises. Here, low-coordinated NiN 3 sites were anchored onto nitrogen-doped ordered mesoporous carbon (Ni-SAs/NOMC), which is capable of efficiently catalyzing the coupled methanol oxidation reaction and CO 2 reduction reaction (MOR||CO 2 RR), thereby reducing the energy required for CO 2 conversion and enhancing the economic value of the CO 2 electrolytic system. In the membrane electrode assembly electrolyzer-based MOR||CO 2 RR, Ni-SAs/NOMC achieved Faradaic efficiencies (FEs) of 95.4% for formate at the anode and 96.3% for CO at the cathode. Moreover, at a current density of 0.8 A cm –2, Ni-SAs/NOMC demonstrated stable electrolysis for up to 100 h, with FEs at both the anode and cathode remaining stable at approximately 90%. In situ spectroscopy analyses and theoretical calculations identified the formation of critical intermediate species and the origin of activity improvement, guiding the development of efficient electrosynthesis of valuable chemicals.