1. Instituto de Química de São Carlos, Av. Trab. Sancarlense 400, CEP 13560-970, São Carlos-SP, Brazil
2. Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, Berlin, Germany D-14195
3. Ertl Center for Electrochemistry and Catalysis, GIST, Cheomdan-gwagiro 261, Buk-gu, Gwangju 500-712, South Korea