Yang Na, Ren Yueping, Li Xiufen, Wang Xinhua
Jiangsu Key Laboratory of Anaerobic Biotechnology, Jiangsu Cooperative Innovation Center of Technology and Material of Water Treatment, School of Environmental and Civil Engineering, Jiangnan University, Wuxi, Jiangsu 214122, China.
Jiangsu Key Laboratory of Anaerobic Biotechnology, Jiangsu Cooperative Innovation Center of Technology and Material of Water Treatment, School of Environmental and Civil Engineering, Jiangnan University, Wuxi, Jiangsu 214122, China.
Bioelectrochemistry. 2017 Jun;115:41-46. doi: 10.1016/j.bioelechem.2017.02.002. Epub 2017 Feb 27.
Anolyte acidification is a drawback restricting the electricity generation performance of the buffer-free microbial fuel cells (MFC). In this paper, a small amount of alkali-treated anion exchange resin (AER) was placed in front of the anode in the KCl mediated single-chamber MFC to slowly release hydroxyl ions (OH) and neutralize the H ions that are generated by the anodic reaction in two running cycles. This short-term alkaline intervention to the KCl anolyte has promoted the proliferation of electroactive Geobacter sp. and enhanced the self-buffering capacity of the KCl-AER-MFC. The pH of the KCl anolyte in the KCl-AER-MFC increased and became more stable in each running cycle compared with that of the KCl-MFC after the short-term alkaline intervention. The maximum power density (P) of the KCl-AER-MFC increased from 307.5mW·m to 542.8mW·m, slightly lower than that of the PBS-MFC (640.7mW·m). The coulombic efficiency (CE) of the KCl-AER-MFC increased from 54.1% to 61.2% which is already very close to that of the PBS-MFC (61.9%). The results in this paper indicate that short-term alkaline intervention to the anolyte is an effective strategy to further promote the performance of buffer-free MFCs.
阳极液酸化是限制无缓冲微生物燃料电池（MFC）发电性能的一个缺点。本文中，在KCl介导的单室MFC中，将少量碱处理的阴离子交换树脂（AER）置于阳极前，以在两个运行周期内缓慢释放氢氧根离子（OH）并中和阳极反应产生的H离子。这种对KCl阳极液的短期碱性干预促进了电活性地杆菌属的增殖，并增强了KCl-AER-MFC的自缓冲能力。与短期碱性干预后的KCl-MFC相比，KCl-AER-MFC中KCl阳极液的pH值在每个运行周期中都有所升高且变得更加稳定。KCl-AER-MFC的最大功率密度（P）从307.5mW·m增加到542.8mW·m，略低于PBS-MFC（640.7mW·m）。KCl-AER-MFC的库仑效率（CE）从54.1%提高到61.2%，已经非常接近PBS-MFC（61.9%）。本文结果表明，对阳极液进行短期碱性干预是进一步提高无缓冲MFC性能的有效策略。
