EFFECT OF CRYSTALLOGRAPHIC ORIENTATION OF SINGLE-CRYSTAL RUO2 ELECTRODES ON THE HYDROGEN ADSORPTION REACTIONS
EFFECT OF CRYSTALLOGRAPHIC ORIENTATION OF SINGLE-CRYSTAL RUO2 ELECTRODES ON THE HYDROGEN ADSORPTION REACTIONS
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DOI：
10.1149/1.2116026
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发表时间：
1984-01-01
影响因子：
3.9
通讯作者：
OGRADY, WE
中科院分区：
文献类型：
--
作者：
HEPEL, T;POLLAK, FH;OGRADY, WE
结果具有(110)、(001)、(101)、(111)和(100)晶面的5种“原生”晶体的循环伏安图表明了峰结构的某些系统发展，因此它们首先以预先选定的顺序呈现在下面。9首先显示了(110)和(001)晶面的CV和其他特征，它们显示了更发达的伏安图。最后讨论了(100)表面的伏安特性，因为该表面表现出比其余表面更复杂的行为。Ru02(110)表面。--如图1所示，是单晶RuO2在0.5mo]dm_3H_2SO_4溶液中的(110)“原生”表面的循环伏安曲线。在循环伏安曲线的阴极扫描中观察到两个明显的峰。在图1中，我们将这些峰归因于氢吸附反应，并分别将它们标记为HLC和H，c。这两个反应都是可逆的，对应于氢脱附的两个阳极峰，标记为H_2A和H，A，分别出现在与H_2c和H，c几乎相同的峰电位处。我们注意到洋流I，。A和IP.~与第二对还原]氧化峰H2相比，约小2-3倍。在氢吸附]脱附反应区中观察到的所有四个峰的峰电流与电位扫描速率v的关系是线性的，表明表面控制的反应。为了清楚起见，图1中仅显示了三个v值的CV曲线。类似地，如前面所讨论的(22)，对于不涉及氢吸附区域的伏安图的情况，所建立的循环伏安特性与LSV曲线没有显著差异，并且在几个循环之后可以获得重复性很好的伏安图。
ResultsCyclic voltammograms for five" as-grown" crystals having (110),(001),(101),(111), and (100) surfaces indicate some systematic development of the peak structure, and because of this they are presented below in a preselected order9 At first are shown CV and other characteristics for (110) and (001) faces which show more developed voltammograms. The current-voltage characteristics for the (100) surface are discussed at the end because this surface shows more complicated behavior than the remaining faces.Ru02 (110) surface.--Shown in Fig. 1 are the cyclic voltammograms for the (110)" as-grown" surface of singlecrystal RuO2 in 0.5 mo]] dm 3 H2SO4 solution. Two distinct peaks are observed in cathodic scan of CV curves. We attribute these peaks to the hydrogen adsorption reactions and label them Hlc and H2c, respectively, in Fig. 1. Both reactions are quite reversible, and two anodic peaks corresponding to hydrogen desorption, labeled H2A and H, A, appear at nearly the same peak potentials as H2c and H, c, respectively. We note that the currents i,. a and ip.~ for the peaks H~ are about a factor of 2-3 smaller than those for the second pair of the reduction] oxidation peaks H2. The dependence of the peak current upon the potential scan rate, v, for all four peaks observed in the hydrogen adsorption] desorption reaction region is linear indicating surface-controlled reactions. In Fig. 1 are shown CV curves for only three values of v for purposes of clarity. Similarly, as discussed earlier (22), for the case of voltammograms not involving hydrogen adsorption region, established CV characteristics do not differ significantly from LSV~ urves and well-reproducible voltammograms can be obtained after a few cycles.