AUTHOR=Ren Hao TITLE=Further Improving the Current and Power Density of Miniaturized Microbial Fuel Cells JOURNAL=Frontiers in Mechanical Engineering VOLUME=7 YEAR=2021 URL=https://www.frontiersin.org/journals/mechanical-engineering/articles/10.3389/fmech.2021.616179 DOI=10.3389/fmech.2021.616179 ISSN=2297-3079