@InProceedings{CoutoOishSardFerr:2017:ElPeTh,
               author = "Couto, Andrea Boldarini and Oishi, Silvia Sizuka and Sardinha, 
                         Andre Ferreira and Ferreiraa, Neiden{\^e}i Gomes",
          affiliation = "{} and {Instituto Nacional de Pesquisas Espaciais (INPE)} and 
                         {Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)}",
                title = "Electrocatalytic performance of three dimensional electrode 
                         Cu/reduced oxide graphene/ carbon fiber for nitrate reduction",
                 year = "2017",
         organization = "ECS Meeting, 232.",
             abstract = "Nitrate ions are well-known water toxic inorganic pollutants and 
                         their high concentrations can cause a serious problem for both 
                         aquatic systems and human health. In this sense, it is of great 
                         importance to monitor nitrate ions in various kind of source [1]. 
                         Among several analytical technologies that been used for its 
                         detection, electrochemical technique offers a simple, rapid, 
                         selective, sensitive, inexpensive, safety method for this purpose, 
                         not to mention its considered green technology [2]. To improve the 
                         nitrate process performance and selectivity, novel electrode 
                         materials have been widely investigated. This work aims to develop 
                         a sensitive and reliable three dimensional electrode consisting of 
                         Cu particles/reduced oxide graphene (rGO)/carbon fiber (CF) for 
                         monitoring nitrate concentration. CF produced at heat treatment 
                         temperature of 1000 ºC was used in this study. The rGO 
                         electrodeposition on CF (1 cm2) was performed at a fixed potential 
                         of -1.25 V vs. Ag/AgCl/KCl(sat) for 15 min in a 20 mL of the 
                         graphene oxide (3mg mL-1) + 0.1 mol L-1 LiClO4 aqueous solution. 
                         The Cu electrodeposition on rGO/CF was carried out at a fixed 
                         potential of -0.7 V for 3, 6, 10, 20 min in a 10 mmol L-1 CuSO4 + 
                         100 mmol L-1 H2SO4 aqueous solution. Cu/rGO/CF composites 
                         morphologies and structures were analyzed by field emission gun 
                         scanning electron microscopy (FEG-SEM), X-ray diffraction, and 
                         Raman spectroscopy. Nitrate electro-reduction was evaluated using 
                         cyclic voltammetry at 50 mV s-1 in 0.1 mol L-1 K2SO4 solution (pH 
                         = 3.0) with and without the presence of 10-2 mol L-1 KNO3. For 
                         rGO/CF binary composite, FEG-SEM images showed the characteristic 
                         aggregates with irregular and flakes-like shape with high particle 
                         density on CF substrate. The Cu deposits depicted small grain 
                         morphologies distributed throughout the rGO/CF surface. As 
                         expected, Cu deposit rate increased with increasing the deposition 
                         time. From X-ray diffraction analyses of the Cu particles, a 
                         mixture of phases containing cuprous oxide and metallic copper was 
                         identified. Under optimal experimental conditions, the Cu/rGO/CF 
                         electrode showed good catalytic activity for nitrate 
                         electro-reduction. This behavior can be associated to the presence 
                         of rGO and CF with high specific surface area in addition to Cu 
                         particle with high electron transfer capability. These results 
                         showed that Cu/rGO/CF composite has a great potential as new 
                         promising electrode for nitrate electroreduction application.",
  conference-location = "National Harbor, MD",
      conference-year = "01-05 Oct.",
             language = "en",
        urlaccessdate = "27 abr. 2024"
}