Concentrated formate produced through co-electrolysis of CO2 and methanol in a zero-gap electrolyzer,AIChE Journal

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Concentrated formate produced through co-electrolysis of CO2 and methanol in a zero-gap electrolyzer
AIChE Journal ( IF 3.7 ) Pub Date : 2024-02-20 , DOI: 10.1002/aic.18382
Jianlong Lin ₁ , Haoyuan Chi ₁ , Hai Liu ₁ , Qun Fan ₁ , Tianxiang Yan ₁ , Siyu Kuang ₁ , Hui Wang ₁ , Minglu Li ₁ , Yabo Yan ₁ , Tianying Zhang ₁ , Sheng Zhang _{1,

2} , Xinbin Ma _{1,

2}

Affiliation

Recent progresses have highlighted the enormous potentials of renewable electricities driven carbon dioxide (CO₂) electrolysis in achieving carbon neutrality. However, its further industrial application is limited by low liquid product concentrations, which requires energy-intensive downstream separation processing. Herein we report a CO₂ and methanol co-electrolysis strategy to produce formate at both electrodes and collect highly concentrated formate in zero-gap CO₂ electrolyzers. An anion exchange membrane was employed to enable formate product crossover from cathode to anode. A bismuth silicate derived nanofiber electrocatalyst with rich grain boundaries was synthesized and exhibited excellent formate selectivity (Faradaic efficiency >95%), high activity (partial current density >500 mA cm⁻²), as well as good stability (>120 h). Coupled with NiOX anode catalyst for methanol selective oxidation to formate in a zero-gap electrolyzer, we demonstrate a ~180% of formate Faradaic efficiency and a full-cell voltage of 2.43 V at an industrially relevant current density of 0.2 A cm⁻². By decoupling product generation and collection, our electrolyzer produced a highly concentrated formate of 3.24 M, which could be directly used as anode fuel for fuel cells.

更新日期：2024-02-20

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