Efficient H2O2 Electrosynthesis in Acidic media via Multiscale Catalyst Optimization

Authors
Shim, JaehyukLee, JaewooShin, HeejongMok, Dong HyeonHeo, SungeunPaidi, Vinod K.Lee, Byoung-HoonLee, Hyeon SeokYang, JuhyunShin, DonghoMoon, JaehoKim, KangJung, MuhoLee, EungjunBootharaju, Megalamane S.Kim, Jeong HyunPark, SubinKim, Mi-JuGlatzel, PieterYoo, Sung JongBack, SeoinLee, Kug-SeungSung, Yung-EunHyeon, Taeghwan
Issue Date
2025-03
Publisher
WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Citation
Advanced Materials
Abstract
Electrochemically generating hydrogen peroxide (H2O2) from oxygen offers a more sustainable and cost-effective alternative to conventional anthraquinone process. In alkaline conditions, H2O2 is unstable as HO2-, and in neutral electrolytes, alkali cation crossover causes system instability. Producing H2O2 in acidic electrolytes ensures enhanced stability and efficiency. However, in acidic conditions, the oxygen reduction reaction mechanism is dominated by the inner-sphere electron transfer pathway, requiring careful consideration of both reaction and mass transfer kinetics. These stringent requirements limit H2O2 production efficiency, typically below 10-20% at industrial-relevant current densities (>300 mA cm(-2)). Using a multiscale approach that combines active site tuning with macrostructure tuning, this work presents an octahedron-like cobalt structure on interconnected hierarchical porous nanofibers, achieving a faradaic efficiency exceeding 80% at 400 mA cm(-2) and stable operation for over 120 h at 100 mA cm(-2). At 300 mA cm(-2), the optimized catalyst demonstrates a cell potential of 2.14 V, resulting in an energy efficiency of 26%.
Keywords
OXYGEN REDUCTION; HYDROGEN-PEROXIDE; ELECTRON-TRANSFER; ATOM; SPECTROSCOPY; hydrogen peroxide production; inner-sphere electron transfer pathway; multi-level tuning strategy; octahedron-like cobalt structure; H2O2 treatment
ISSN
0935-9648
URI
https://pubs.kist.re.kr/handle/201004/152227
DOI
10.1002/adma.202418489
Appears in Collections:
KIST Article > Others
Files in This Item:
There are no files associated with this item.
Export
RIS (EndNote)
XLS (Excel)
XML

qrcode

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE