Correction to: Electrosynthesis of Hydrogen Peroxide Synergistically Catalyzed by Atomic Co–N x –C Sites and Oxygen Functional Groups in Noble-Metal-Free Electrocatalysts (Advanced Materials, (2019), 31, 35, (1808173), 10.1002/adma.201808173)

Adv. Mater. 2019, 31, 1808173 In Figure b of the originally published article, the H₂O₂ productivity based on the LSV data in Figure a was calculated incorrectly. The equation to calculate the H₂O₂ productivity presented in the Supporting Information is revised as follows: H₂O₂ productivity (mg cm^-2 h^-1) = 1/2 × (i_r/N × M_r × 3600/(FA) The equation in the Supporting Information is corrected accordingly. Based on the corrected equation, the axis value in Figure b is accordingly corrected and the H₂O₂ productivity of Co–POC–O is 0.98 mg cm⁻² at the potential of 0.70 V versus RHE. The H₂O₂ productivity of the control samples including Co–POC–R and POC–O is also corrected (Figure S23, Supporting Information). However, the conclusion of the article is not affected by this error because the tendency of the samples is not changed. The corrected Figure b is shown here. (Figure presented.) Electrosynthesis of H₂O₂ on the noble-metal-free Co–POC–O electrocatalyst in O₂-saturated 0.10 M KOH electrolyte. b) H₂O₂ productivity and selectivity on the noble-metal-free Co–POC–O electrocatalyst. The Supporting Information text file provided with the article was replaced on August 26, 2019, after initial publication online.