Effect of Melamine on the Oxygen Reduction Reaction in the n(111)-(111) Series of Pt3Co

IF 2.7 4区化学 Q3 CHEMISTRY, PHYSICAL

Electrocatalysis Pub Date : 2024-11-26 DOI:10.1007/s12678-024-00915-5

Takuro Kamei, Masashi Nakamura, Nagahiro Hoshi

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Abstract

Enhancement of the oxygen reduction reaction (ORR) activity is an important subject for the development of fuel cells. In this study, we prepared the n(111)-(111) series of Pt₃Co single crystal electrodes using an induction heating furnace and investigated the ORR in 0.1 M HClO₄ using the rotation disk electrode (RDE). The specific activity of the ORR (j_k) increased monotonously with increasing terrace width n on the n(111)-(111) series of Pt₃Co, showing the highest activity on Pt₃Co(111). The value of j_k of Pt₃Co(111) was 59-fold higher than that of Pt(111) at 0.95 V(RHE). This trend was different from those of the same series of Pt, Pt₃Co, and Pt₃Ni reported previously. Furthermore, the ORR activity was improved on all electrodes by adding melamine to the electrolytic solution. Melamine was preferentially adsorbed at the terrace edge. Pt₃Co(553) n = 5 showed the highest activity. The values of j_k at 0.95 V(RHE) were 23- and 3.3-fold higher than those of Pt(553) n = 5 and Pt₃Co(553) n = 5 without melamine modification, respectively. The durability of Pt₃Co(553) n = 5 with melamine was improved 8.0-fold.

Graphical Abstract

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三聚氰胺对n(111)-(111)系列Pt3Co氧还原反应的影响

提高氧还原反应（ORR）活性是燃料电池发展的一个重要课题。本研究采用感应加热炉制备了n(111)-(111)系列Pt3Co单晶电极，并采用旋转圆盘电极（RDE）研究了0.1 M HClO4中的ORR。在Pt3Co的n(111)-(111)系列上，ORR （jk）的比活性随着梯田宽度n的增加而单调增加，其中以Pt3Co（111）的活性最高。在0.95 V（RHE）下，Pt3Co（111）的jk值比Pt（111）高59倍。这种趋势与之前报道的相同系列的Pt， Pt3Co和Pt3Ni不同。此外，在电解溶液中加入三聚氰胺可以提高所有电极上的ORR活性。三聚氰胺优先吸附在台阶边缘。Pt3Co(553) n = 5活性最高。与未经三聚氰胺改性的Pt(553) n = 5和Pt3Co(553) n = 5相比，在0.95 V（RHE）下的jk值分别高出23倍和3.3倍。加入三聚氰胺后，Pt3Co(553) n = 5的耐久性提高了8.0倍。图形抽象

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来源期刊

Electrocatalysis CHEMISTRY, PHYSICAL-ELECTROCHEMISTRY

CiteScore

4.80

自引率

6.50%

发文量

审稿时长

>12 weeks

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