Overview
- The peer‑reviewed study by Santu Biswas and Matthew M. Montemore, published Thursday, May 21 in Physical Review Letters, reports that rapid atomic rearrangement on common gold facets makes oxygen dissociation extremely unlikely.
- The work shows freshly exposed squarelike gold surfaces can split O2 easily but that those surfaces reconstruct within seconds into tightly packed hexagonal or herringbone motifs that raise the barrier to O2 dissociation by roughly a billion to a trillion times.
- Researchers reached these results with quantum mechanical simulations of two common gold faces, Au(110) and Au(100), calculating energy barriers and reaction rates that explain the huge difference in oxidation propensity.
- The authors propose that preventing or reversing this surface reconstruction, or stabilizing unreconstructed square motifs, could ‘trick’ bulk gold into activating oxygen and thus turn inert gold into an effective oxidation catalyst, though experimental tests are needed.
- The finding reconciles longstanding puzzles about gold chemistry by explaining why bulk gold stays shiny while small gold nanoparticles, which may expose unreconstructed regions, are catalytically active, and it points to next steps in lab validation and catalyst design.