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印度胶孔菌功能化生物光电阴极的荧光和电子转移。

Fluorescence and electron transfer of Limnospira indica functionalized biophotoelectrodes.

机构信息

Empa. Swiss Federal Laboratories for Materials Science and Technology, Laboratory for High Performance Ceramics, 8600, Dübendorf, Switzerland.

Institute for Materials Research (IMO), Hasselt University, Wetenschapspark 1, 3590, Diepenbeek, Belgium.

出版信息

Photosynth Res. 2024 Oct;162(1):29-45. doi: 10.1007/s11120-024-01114-5. Epub 2024 Aug 21.

DOI:10.1007/s11120-024-01114-5
PMID:39168914
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11413049/
Abstract

Cyanobacteria play a crucial role in global carbon and nitrogen cycles through photosynthesis, making them valuable subjects for understanding the factors influencing their light utilization efficiency. Photosynthetic microorganisms offer a promising avenue for sustainable energy conversion in the field of photovoltaics. It was demonstrated before that application of an external electric field to the microbial biofilm or cell improves electron transfer kinetics and, consequently, efficiency of power generation. We have integrated live cyanobacterial cultures into photovoltaic devices by embedding Limnospira indica PCC 8005 cyanobacteria in agar and PEDOT:PSS matrices on the surface of boron-doped diamond electrodes. We have subjected them to varying external polarizations while simultaneously measuring current response and photosynthetic performance. For the latter, we employed Pulse-Amplitude-Modulation (PAM) fluorometry as a non-invasive and real-time monitoring tool. Our study demonstrates an improved light utilization efficiency for L. indica PCC 8005 when immobilized in a conductive matrix, particularly so for low-intensity light. Simultaneously, the impact of electrical polarization as an environmental factor influencing the photosynthetic apparatus diminishes as matrix conductivity increases. This results in only a slight decrease in light utilization efficiency for the illuminated sample compared to the dark-adapted state.

摘要

蓝藻通过光合作用在全球碳氮循环中发挥着关键作用，因此它们是研究影响其光利用效率因素的重要对象。光合微生物为光伏领域的可持续能源转换提供了有前途的途径。以前已经证明，在微生物生物膜或细胞上施加外部电场可以改善电子转移动力学，从而提高发电效率。我们通过将 Limnospira indica PCC 8005 蓝藻嵌入琼脂和 PEDOT：PSS 基质中，并将其置于掺硼金刚石电极表面，将活体蓝藻培养物集成到光伏器件中。我们对它们施加不同的外部极化，同时测量电流响应和光合作用性能。对于后者，我们使用脉冲幅度调制 (PAM) 荧光法作为非侵入式和实时监测工具。我们的研究表明，当固定在导电基质中时，L. indica PCC 8005 的光利用效率得到了提高，特别是在低强度光下。同时，随着基质电导率的增加，作为影响光合作用装置的环境因素的电极化的影响减小。与暗适应状态相比，这导致受光样品的光利用效率仅略有下降。

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