Role of electrolytes composition, ionic crossover and CO2 availability in bioelectrochemical methanation
バイオ電気化学的メタン化における電解質組成、イオンクロスオーバー、CO2供給の役割 (AI 翻訳)
Vega-Paredes, Maria, Colantoni, Simone, Martín-Sandoval, Marina, Sánchez-Cueto, Pablo, Ghemis, Radu, Puig, Sebastià, Molognoni, Daniele, Borràs, Eduard, Gómez Rodríguez, Amanda
🤖 gxceed AI 要約
日本語
バイオ電気化学的メタン化（BEM）はCO2と再生可能電力をメタンに変換するCCU技術である。本研究では3セルスタックを83日間運転し、電解質組成、電流密度、溶存CO2濃度の影響を調査した。溶存CO2を低減するとメタン純度が88%まで向上し、クーロン効率は99%に達した。イオンクロスオーバーによる塩蓄積がメタン生成を阻害するが、電解質交換で回復可能であることを示した。
English
Bioelectrochemical methanation (BEM) converts CO2 and renewable electricity into methane. This study operated a three-cell stack for 83 days, finding that reducing dissolved CO2 improved methane purity to 88% and coulombic efficiency to 99%. Ionic crossover caused salt accumulation inhibiting methanogenesis, but electrolyte replacement restored activity. Results guide electrolyte design and CO2 delivery for scalable BEM systems.
Unofficial AI-generated summary based on the public title and abstract. Not an official translation.
📝 gxceed 編集解説 — Why this matters
日本のGX文脈において
日本ではカーボンリサイクル技術の社会実装が進められており、CO2利用技術の効率向上は重要。本研究成果は、メタネーション技術の実用化に向けた電解質設計やCO2供給戦略に示唆を与える。
In the global GX context
Globally, CCU technologies are critical for decarbonization. This study provides practical insights into optimizing bioelectrochemical methanation, a promising route for converting CO2 into renewable methane, supporting the development of scalable carbon utilization systems.
👥 読者別の含意
🔬研究者:Provides systematic data on electrolyte and CO2 effects in BEM stacks, useful for optimizing bioelectrochemical systems.
🏢実務担当者:Offers guidance on electrolyte management and CO2 delivery for pilot-scale methanation units.
🏛政策担当者:Highlights the potential of BEM as a CCU technology, informing support for carbon recycling infrastructure.
📄 Abstract（原文）
Bioelectrochemical methanation (BEM) is a promising carbon capture and utilization (CCU) technology that converts CO 2 and renewable electricity into synthetic methane under mild operating conditions. However, the performance and stability of BEM stacks are strongly influenced by electrolyte composition, ionic crossover and carbon availability, factors that remain poorly understood beyond single-cell systems. In this work, a three-cell BEM stack was operated under galvanostatic control for 83 days to systematically investigate the combined effects of electrolyte composition, applied current density and dissolved CO 2 concentration on methane production, purity and electrochemical efficiency. The stack was operated at 6 and 12 A m −2 , while dissolved CO 2 in the catholyte was progressively reduced from near saturation to < 0.22 g L −1 . Results show that excessive ionic crossover led to salt accumulation and partial inhibition of methanogenesis, which was mitigated by electrolyte replacement that restored microbial activity and stabilized conductivity below inhibitory thresholds. Lower dissolved CO 2 concentrations significantly improved CH 4 purity (up to 88%) while sustaining high production rates (1.1 ± 0.3 L -CH 4 L −1 cathode d −1 ) and cathodic Coulombic efficiencies up to 99%. Ion balance analysis revealed that charge transport was dominated by cations and phosphate species rather than protons, contributing to increased ohmic and pH-related losses. Overall, this study demonstrates that controlling dissolved CO 2 availability and managing ionic crossover in BEM stacks are critical levers for optimizing their performances. These findings provide practical guidance for electrolyte design and CO 2 delivery strategies in BEM systems, supporting the development of scalable bioelectrochemical routes for CO 2 utilization.
🔗 Provenance — このレコードを発見したソース
- Zenodo https://zenodo.org/records/20490063first seen 2026-06-02 04:13:39
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