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Study on the Synthesis of the Nanometer Cobalt and Nickel Oxides and Their Catalytic Behavior for the Electroreduction of H2O2

Author: YinCuiLei
Tutor: WangGuiLing
School: Harbin Engineering University
Course: Applied Chemistry
Keywords: Co3O4 and NiCo2O4 Nanowires β-Ni OH 2 nanosheet layer electrodes H2O2 electro-reduction Cathode catalyst
CLC: TB383.1
Type: Master's thesis
Year: 2009
Downloads: 36
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Abstract


Hydrogen peroxide base fuel cell cathode electrically reduced catalyst is a noble metal , increase the cost of the fuel cell because of its expensive and scarce resources . Research on hydrogen peroxide (H2O2) electrochemical reduction of high catalytic activity and selectivity , good stability , inexpensive catalyst is of great significance . This thesis use in a liquid solution of the direct growth SYSTEM prepare a tetroxide three cobalt ( sized Co3O4 ) , cobalt acid Nickel (NiCo2O4) nanowires electrodes and B-type hydroxide Nickel ( B of - of Ni (OH) 2 ) electrodes , and with X-ray diffraction analysis (XRD), transmission electron microscopy ( TEM ) , scanning electron microscopy ( SEM ) , the specific surface area (BET) and other means of characterization. The XRD pattern shows that the nanowires were prepared spinel configuration of Co3O4 and NiCo2O4 nanoflake layer B - Ni (OH ) 2 . Scanning electron microscopy and transmission electron microscopy show that this Co3O4 and NiCo2O4 nanowire arrays by the diameter of about 500 nm, a length of about 15μm uniform nanowires , Ni (OH) 2 electrode surface nanoflake layer as the B-Ni (OH) 2 crystals. The BET measurement the Co3O4 nanowires specific surface area of approximately 84.76 m2.g - 1 , the specific surface area of NiCo2O4 nanowires approximately 97.90 m2 · g -1 . Catalytic performance as Co3O4 phase , the NiCo2O4 nanowire electrodes and the β-Ni (OH) 2 electrode in a solution of sodium hydroxide (NaOH) reduction of H2O2 power , cyclic voltammetry test results show that of Co3O4 the NiCo2O4 nanowire electrode in 3 mol · L - 1 NaOH solution having a very high catalytic activity and stability of β - Ni (OH ) 2 electrode active somewhat less , but still has its superiority . When the concentration of H2O2 0.4mol · L-1, the electrode potential of -0.4 V , the the of Co3O4 nanowire electrode surface current density is reached the 103.88 mA · cm -2 , the the NiCo2O4 nanowire electrode surface current density reached -124.86 mA · cm -2, β - Ni (OH ) 2 nanosheet -layer electrode is lower. The chronoamperometry Test show that the the Co3O4 nanowires electrodes and NiCo2O4 nanowires electrodes in alkaline solution stability is excellent . The directly grown Nanocrystalline line electrode and a powder coating prepared electrodes, higher activity , better stability , and this method is more convenient .

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