使用非贵金属催化剂来长期增强零间隙微生物电合成细胞中的甲生产
Bin Bian1, Najiaowa Yu1, Amir Akbari2
1Department of Civil and Environmental Engineering, The Pennsylvania State University, University Park, PA 16802, USA.
Water research
|May 31, 2024
概括
非贵金属催化剂增强微生物电合成 (MES) 用于甲生产. 在零间隔电池中使用NiMo/C催化剂显著提高了甲生成率,证明了长期可行性.
科学领域:
- 电化学 电化学 电化学
- 微生物学 微生物学
- 化学工程是化学工程的重要组成部分.
背景情况:
- 微生物电合成 (MES) 使用微生物将二氧化碳转化为有价值的化学物质.
- 演化反应 (HER) 催化剂通常是MES中高化学生产率所需的.
- 贵金属催化剂是有效的,但昂贵.
研究的目的:
- 评估在MES中用于HER的非贵金属催化剂 (NiMo/C).
- 为了比较NiMo/C性能与裸碳和贵金属 (Pt/C) 催化剂.
- 评估NiMo/C在零间隙MES电池中的长期稳定性和效率.
主要方法:
- 开发了一种零间隙MES细胞,具有离子交换膜.
- 用NiMo/C,Pt/C涂层的碳色阴极,或使用裸碳色.
- 在固定电位 (-1 V vs Ag/AgCl) 操作的生物阴极和测量的电流密度和甲生产率.
- 在120天内分析了微生物群落和催化剂稳定性.
主要成果:
- NiMo/C生物阴极实现了23±4A/m2的电流密度和4.7±1.0L/L-d的甲生产率.
- 性能与Pt/C (23 ± 6 A/m2,5.4 ± 2.8 L/L-d) 相当,并且比裸碳阴极高3-5倍.
- 尼莫/C生物阴极在120多天内表现出稳定的运行,其哥伦比亚效率为53±9%.
- 微生物分析显示Methanobacterium占主导地位,不论是正极材料.
结论:
- HER催化剂通过促进 H2 进化到微生物生物膜,显著提高了 MES 中的甲生成率.
- 像NiMo/C这样的非贵金属催化剂是MES贵金属的有效替代品.
- 零间隙电池设计和NiMo/C催化剂使微生物电合成中的长期,高效的甲生产成为可能.
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