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Symmetry Evolution of La2O3 from P3-m1 to P63/mmc for Enhanced Electrocatalytic H2O2 Production
Hansong Yuan1, Yuheng Gu1, Qian Yang1
1School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, China.
Abstract:
Electrocatalytic H2O2 production via the two-electron oxygen reduction reaction (ORR) is a highly sustainable alternative to industrial methods. To further optimize non-noble catalysts, we report an interfacial engineering strategy to stabilize the metastable P63/mmc-La2O3 phase on SrTiO3. This symmetry evolution from the low-symmetry P3-m1 (trigonal) to the high-symmetry P63/mmc (hexagonal) space group yields a composite with >95% H2O2 selectivity. Mechanistic studies demonstrate that the symmetry-regulated interface optimizes *OOH conversion and suppresses O-O bond cleavage. This work offers a robust design principle for high-performance, noble-metal-free H2O2 electrosynthesis.
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