Sub CellAdjacente()
Dim Plage As Range, Cell As Range
With Sheets('Feuil1')
Set Plage = .Range(.Range('A2'), .Range('A65536').End(xlUp))
End With
For Each Cell In Plage
If Cell.Offset(0, 1) = Empty Then
Cell.Offset(0, 1) = Cell
End If
Next Cell
End Sub