Table 1.

Predicted surface reconstructions. Number of ruthenium and oxygen atoms (N _Ru, N _O), number of multiplications of the unit cell (N _cell), total energy per cell from DFT calculations (E _total), ΔN and ΔE values.

Structure	N Ru	N O	N cell	E total, eV	ΔN	ΔE, eV
RuO4–(2 × 1)	17	36	2	−383.24	1	−3.77
Ru4O9–(1 × 1) “cusp”	8	17	1	−180.39	1	−3.59
Ru8O17–(1 × 2)	16	33	2	−355.17	0.5	−0.78
RuO2–(1 × 1)	8	16	1	−174.73	0	2.07