목차
없음
본문내용
4-electron reduction pathway on the Au content. The change in the final reduction product of O2 to either H2O2 or to H2O was found to depend on the heat of adsorption of the intermediates formed during the reduction process [36]. Accordingly, it is presumed that O2 is reduced to H2O2 (HO2 _ in the present case) at the Au/Pt disk electrode and then the generated HO2 _ undergoes desorption without being further reduced to OH_ due to the hindrance caused by the strongly adsorbed OH_ at this potential region (i.e. at about _/240 mV). Consequently a sharp rise of the ring current takes place,
indicating the predominant 2-electron reduction of O2 to HO2 _ as illustrated in the upper panels of Figs. 4_/8.
4. Summary and conclusions
CV and hydrodynamic voltammetry (RRDE) techniques were used to study the oxygen reduction at the Au/ Pt electrodes in O2_/saturated 0.1 M KOH solution. 금/백금 전극에서의 산소환원을 보기위해 CV and hydrodynamic voltammetry (RRDE) techniques 를 이용하였다.
Two reduction peaks for O2 reduction were observed on the CV response, while several interesting features were observed on the steady-state (RRDE) voltammograms.
steady-state (RRDE) voltammograms에서 여러 흥미로운 특색을 얻은 반면 CV에서는 산소환원에서 두개의 환원 피크를 얻었다.
The reduction pathway (mechanism) of O2 to either HO2 _ or OH_ is highly dependent on the electrode potential as well as the Au surface coverage of the Pt electrode.
산소의 HO2 _ or OH_로의 환원 경로는 백금표면의 금 영역 뿐만 아니라 전극의 전위에 크게 의존한다.
Three major potential regions were defined: (i) at E_/_/300 mV, the 2-electron reduction of O2 predominates; (ii) at _/500B/E_/_/300 mV, the 2- electron reduction of O2 shifts to a 4-electron pathway due to the presence of specifically adsorbed OH_ anions which are thought to facilitate the 4-electron reduction pathway;
and (iii) at E-500 mV, the 4-electron reduction of O2 predominates less due to the decrease of the amount of adsorbed OH_ and the start of generation of adsorbed hydrogen atoms (Hads) which causes a partial blocking of the active sites of the surface, and consequently the 2-electron reduction becomes predominant.
-500mV보다 작은 전압 범위에서는 흡착된 OH_ 감소와 표면의 활성 부위을 부분적으로 막는 흡착된 수소원자의 발생의 시작으로 4전자 환원반응이 덜 우세하다 따라서 2전자 환원반응이 우세해 진다.
indicating the predominant 2-electron reduction of O2 to HO2 _ as illustrated in the upper panels of Figs. 4_/8.
4. Summary and conclusions
CV and hydrodynamic voltammetry (RRDE) techniques were used to study the oxygen reduction at the Au/ Pt electrodes in O2_/saturated 0.1 M KOH solution. 금/백금 전극에서의 산소환원을 보기위해 CV and hydrodynamic voltammetry (RRDE) techniques 를 이용하였다.
Two reduction peaks for O2 reduction were observed on the CV response, while several interesting features were observed on the steady-state (RRDE) voltammograms.
steady-state (RRDE) voltammograms에서 여러 흥미로운 특색을 얻은 반면 CV에서는 산소환원에서 두개의 환원 피크를 얻었다.
The reduction pathway (mechanism) of O2 to either HO2 _ or OH_ is highly dependent on the electrode potential as well as the Au surface coverage of the Pt electrode.
산소의 HO2 _ or OH_로의 환원 경로는 백금표면의 금 영역 뿐만 아니라 전극의 전위에 크게 의존한다.
Three major potential regions were defined: (i) at E_/_/300 mV, the 2-electron reduction of O2 predominates; (ii) at _/500B/E_/_/300 mV, the 2- electron reduction of O2 shifts to a 4-electron pathway due to the presence of specifically adsorbed OH_ anions which are thought to facilitate the 4-electron reduction pathway;
and (iii) at E-500 mV, the 4-electron reduction of O2 predominates less due to the decrease of the amount of adsorbed OH_ and the start of generation of adsorbed hydrogen atoms (Hads) which causes a partial blocking of the active sites of the surface, and consequently the 2-electron reduction becomes predominant.
-500mV보다 작은 전압 범위에서는 흡착된 OH_ 감소와 표면의 활성 부위을 부분적으로 막는 흡착된 수소원자의 발생의 시작으로 4전자 환원반응이 덜 우세하다 따라서 2전자 환원반응이 우세해 진다.
소개글