He Yu-Ting, Fu Qian, Pang Yuan, Li Qing, Li Jun, Zhu Xun, Lu Ren-Hao, Sun Wei, Liao Qiang, Schröder Uwe
Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Ministry of Education, Chongqing University, Chongqing 400044, China.
Institute of Engineering Thermophysics, School of Energy and Power Engineering, Chongqing University, Chongqing 400044, China.
iScience. 2021 Feb 10;24(3):102163. doi: 10.1016/j.isci.2021.102163. eCollection 2021 Mar 19.
Bioelectrochemical systems (BESs) can fulfill the demand for renewable energy and wastewater treatment but still face significant challenges to improve their overall performance. Core efforts have been made to enhance the bioelectrode performance, yet, previous approaches are fragmented and have limited applicability, unable to flexibly adjust physicochemical and structural properties of electrodes for specific requirements in various applications. Here, we propose a facile electrode design strategy that integrates three-dimensional printing technology and functionalized modular electrode materials. A customized graphene-based electrode with hierarchical pores and functionalized components (i.e., ferric ions and magnetite nanoparticles) was fabricated. Owing to efficient mass and electron transfer, a high volumetric current density of 10,608 ± 1,036 A/m was achieved, the highest volumetric current density with pure to date. This strategy can be readily applied to existing BESs (e.g., microbial fuel cells and microbial electrosynthesis) and provide a feasibility for practical application.
生物电化学系统（BESs）能够满足可再生能源和废水处理的需求，但在提高其整体性能方面仍面临重大挑战。人们已做出核心努力来提升生物电极性能，然而，先前的方法零散且适用性有限，无法针对各种应用中的特定要求灵活调整电极的物理化学和结构特性。在此，我们提出一种简便的电极设计策略，该策略整合了三维打印技术和功能化模块化电极材料。制备了一种具有分级孔隙和功能化组件（即铁离子和磁铁矿纳米颗粒）的定制石墨烯基电极。由于高效的质量和电子传递，实现了10,608 ± 1,036 A/m的高体积电流密度，这是迄今为止纯[具体物质未提及]的最高体积电流密度。该策略可轻松应用于现有的生物电化学系统（如微生物燃料电池和微生物电合成），并为实际应用提供了可行性。
