Correction for "In operando visualization of redox flow battery in membrane-free microfluidic platform," by Hyungjoo Park, Giyun Kwon, Hyomin Lee, Kyunam Lee, Soo Young Park, Ji Eon Kwon, Kisuk Kang, and Sung Jae Kim, which published February 23, 2022; https://doi.org/10.1073/pnas.2114947119 (Proc. Natl. Acad. Sci. USA. 119, e2114947119).The authors note that Fig. 2 appeared incorrectly: Fig. 2 B and D were inadvertently switched. While the error does not affect the scientific results, authors note that the error may cause confusion to readers. The corrected figure and its legend appear below. The online version has been corrected.
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