Enhancing the durability of Pt nanoparticles for water electrolysis using ultrathin SiO2 layers

被引:8
作者
Li, Ming [1 ,2 ]
Saedy, Saeed [1 ]
Fu, Shilong [2 ]
Stellema, Teise [1 ]
Kortlever, Ruud [2 ]
van Ommen, J. Ruud [1 ]
机构
[1] Delft Univ Technol, Fac Appl Sci, Dept Chem Engn, Maasweg 9, NL-2629 HZ Delft, Netherlands
[2] Delft Univ Technol, Fac Mech Maritime & Mat Engn, Proc & Energy Dept, Leeghwaterstr 39, NL-2628 CB Delft, Netherlands
关键词
TEMPERATURE; DEPOSITION; THICKNESS; CATALYSTS; GROWTH;
D O I
10.1039/d3cy00996c
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Extending the lifetime of electrocatalytic materials is a major challenge in electrocatalysis. Here, we employ atomic layer deposition (ALD) to coat the surface of carbon black supported platinum nanoparticles (Pt/CB) with an ultra-thin layer of silicon dioxide (SiO2) to prevent deactivation of the catalyst during H-2 evolution. Our results show that after an accelerated durability test (ADT) the current density at -0.2 V vs. reversible hydrogen electrode (RHE) of the unprotected Pt/CB catalyst was reduced by 34%. By contrast, after coating the Pt/CB catalyst with 2 SiO2 ALD cycles, the current density at the same potential was reduced by 7% after the ADT procedure, whereas when the Pt/CB sample was coated with 5 SiO2 ALD cycles, the current density was reduced by only 2% after the ADT. Characterization of the Pt particles after electrochemical testing shows that the average particle size of the uncoated Pt/CB catalyst increases by roughly 16% after the ADT, whereas it only increases by 3% for the Pt/CB catalyst coated with 5 cycles of SiO2 ALD. In addition, the coating also strongly reduces the detachment of Pt nanoparticles, as shown by a strong decrease in the Pt concentration in the electrolyte after the ADT. However, 20 cycles of SiO2 ALD coating results in an over-thick coating that has an inhibitory effect on the catalytic activity. In summary, we demonstrate that only a few cycles of SiO2 ALD can strongly improve the stability of Pt catalyst for the hydrogen evolution reaction.
引用
收藏
页码:1328 / 1335
页数:8
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