Selective, Stable, Bias‐Free, and Efficient Solar Hydrogen Peroxide Production on Inorganic Layered Materials

• DOI: 10.1002/adfm.202110412
• Publication Date: 2022-01-19T11:59:11Z
• Authors: Jaejung Song; Je Min Yu; Jang Hyuk Ahn; Hyeonjin Cho; Jiyeon Oh; Yoon Seo Kim; Jieun Kim; Myohwa Ko; Seong‐hun Lee; Tae Joo Shin; Hu Young Jeong; Changduk Yang; Jun Hee Lee; Ji‐Wook Jang; Seungho Cho
• Keywords: Layered double hydroxides; Reversible hydrogen electrode; Carbon fibers

Abstract The importance of hydrogen peroxide (H 2 O ) continues to grow globally. Deriving the oxygen reduction reaction (ORR) toward 2e – pathway form H is crucial for high productivity. However, most selective electrocatalysts following comprise carbon‐containing organic materials with intrinsically low stability, thereby limiting their commercial applicability. Herein, layered double hydroxides (LDHs) are used as inorganic matrices first time. LDH catalyst developed herein exhibits near‐100% ORR selectivity and stably produces a concentration ≈108.2 mm cm –2 photoanode in 24 h two‐compartment system (with photoanode) solar‐to‐chemical conversion efficiency ≈3.24%, highest among all reported systems. Density functional theory calculations show that promoted by atomically dispersed cobalt atoms (012) planes catalyst, while free energy gap between * OOH states an important factor.