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首页> 外文期刊>International Journal of Electrochemical Science >The Catalytic Activity of Ruthenates ARuO3 (A= Ca, Sr or Ba) for the Hydrogen Evolution Reaction in Acidic Medium
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The Catalytic Activity of Ruthenates ARuO3 (A= Ca, Sr or Ba) for the Hydrogen Evolution Reaction in Acidic Medium

机译：钌酸盐ARuO 3 （A = Ca，Sr或Ba）在酸性介质中对氢生成反应的催化活性

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Ruthenate perovskites ARuO3, (A= Ca, Sr or Ba) were prepared by coprecipitation method. Theelectrocatalytic activity of the prepared perovskites was investigated toward the hydrogen evolution4+ 2+ 2+ reaction (HER). X-ray diffraction analysis suggested successful incorporation of Ru at the Ca , Sr2+ and Ba cations sites confirming the formation of the orthorhombic perovskite phases of CaRuO3 andSrRuO3 and the hexagonal perovskite phase of BaRuO3. The average particle size for the preparedperovskites was 39.0, 42.2 and 101.4 nm for Ca, Sr and BaRuO3, respectively. Scanning electronmicrographs showed a well-defined hexagonal crystal structure in case of BaRuO3, while CaRuO3 andSrRuO3 composed of agglomerations of nearly spherical grains. CaRuO3 showed smalleragglomerations and more cavities than SrRuO3. The influence of the type of A-cation on the catalyticactivity for HER was studied by Tafel linear polarization. The order of the electrocatalytic activity wasBaRuO3綜aRuO3維rRuO3. This was shown from the values of the exchange current density, -60.7, - -2 13.1 and -884.6 A.cm for Ca, Sr and BaRuO3, respectively. This suggested that the A-site metal ionnot only has a strong effect on the stability of the whole crystal configuration but also provides thepossibility to improve catalyst performance by synergetic interactions with the B-site metal ion. Theactivation energy, reaction order and reaction mechanism have been investigated using theelectrochemical techniques, Tafel linear polarization and impedance. Again, the calculated values ofthe activation energy gave similar trend for catalytic activity; 42.6, 86.3 and 17.7 kJ/mol for Ca, Sr andBaRuO3respectively. Both Tafel and the impedance data showed that the volmer step is the ratedetermining step. In addition, the effect of the partial substitution at the A-site in Sr1-xCaxRuO3 wasalso studied. The catalytic activity of ternary perovskites was about twice higher than that of binaryones. The catalytic activity of ternary oxides increased with increasing the fraction of Ca-doped.
机译：通过共沉淀法制备钌酸钙钛矿ARuO3（A = Ca，Sr或Ba）。研究了所制备钙钛矿对氢析出4+ 2+ 2+反应（HER）的电催化活性。 X射线衍射分析表明Ru成功地掺入了Ca，Sr2 +和Ba阳离子位，证实了CaRuO3和SrRuO3的正交晶钙钛矿相的形成以及BaRuO3的六方钙钛矿相的形成。对于Ca，Sr和BaRuO3，制备的钙钛矿的平均粒径分别为39.0、42.2和101.4 nm。扫描电子显微照片显示，在BaRuO3的情况下，六边形晶体结构清晰，而CaRuO3和SrRuO3由近球形颗​​粒的团聚组成。与SrRuO3相比，CaRuO3表现出更小的团聚和更多的空洞。通过Tafel线性极化研究了A阳离子类型对HER催化活性的影响。电催化活性的顺序为BaRuO3综aRuO3维rRuO3。 Ca，Sr和BaRuO3的交换电流密度分别为-60.7，-2 -1 13.1和-884.6 A.cm，表明了这一点。这表明A位金属离子不仅对整个晶体构型的稳定性有强烈影响，而且还提供了通过与B位金属离子的协同相互作用来改善催化剂性能的可能性。利用电化学技术，Tafel线性极化和阻抗研究了活化能，反应级数和反应机理。同样，活化能的计算值给出了类似的催化活性趋势。 Ca，Sr和BaRuO3分别为42.6、86.3和17.7 kJ / mol。 Tafel和阻抗数据均表明，volmer步骤是额定步骤。另外，还研究了Sr1-xCaxRuO3中A位部分取代的影响。三元钙钛矿的催化活性大约是二元酮的两倍。三元氧化物的催化活性随掺钙比例的增加而增加。

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