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Highly Active Carbon Supported PtCu Electrocatalysts for PEMFCs by in situ Supercritical Deposition Coupled with Electrochemical Dealloying
Fuel Cells ( IF 2.6 ) Pub Date : 2019-11-06 , DOI: 10.1002/fuce.201900087
S. B. Barim 1 , S. E. Bozbag 1 , B. Deljoo 2 , M. Aindow 2 , C. Erkey 1, 3
Affiliation  

Carbon aerogel and Vulcan supported PtCu electrocatalysts were prepared using the simultaneous and sequential in situ supercritical deposition (SCD) method in supercritical CO2 followed by thermal annealing and electrochemical dealloying. Before dealloying, annealed electrocatalysts prepared by simultaneous SCD had a more uniform PtCu composition in PtCu nanoparticles whereas electrocatalysts prepared by sequential SCD led to PtCu nanoparticles with Cu enrichment on the surface. Upon dealloying, PtCu/CA electrocatalyst prepared by simultaneous SCD had an enhanced ESA of 159.4 m2 g−1 due to the synergistic effects of PtCu nanoparticle size and PtCu composition in nanoparticles. All dealloyed electrocatalysts had higher mass activities and PtCu/Vulcan electrocatalyst prepared by simultaneous SCD had the highest mass activity of 0.178 A mgPt−1 which was more than twice of the mass activity of commercial Pt/C. PtCu/Vulcan electrocatalyst prepared by sequential SCD showed a specific activity of 0.511 mA cm−2 which was 5 times higher than the specific activity of commercial Pt/C.

中文翻译:

原位超临界沉积与电化学脱合金偶联的PEMFC高活性炭负载PtCu电催化剂

碳气凝胶和火神支持PtCu电催化剂被使用同时和顺序制备原位超临界沉积(SCD)方法在超临界二氧化碳2接着热退火和电化学脱合金。在脱合金之前,通过同时SCD制备的退火电催化剂在PtCu纳米颗粒中具有更均匀的PtCu组成,而通过连续SCD制备的电催化剂导致表面富集Cu的PtCu纳米颗粒。脱合金后,通过同时SCD制备的PtCu / CA电催化剂的ESA增强了159.4 m 2 g -1由于PtCu纳米颗粒尺寸和PtCu组成在纳米颗粒中的协同作用。所有脱合金的电催化剂均具有较高的质量活度,并且通过同时SCD制备的PtCu / Vulcan电催化剂的最高质量活度为0.178 A mg Pt -1,是商业Pt / C的质量活度的两倍以上。通过连续SCD制备的PtCu / Vulcan电催化剂显示出0.511mA cm -2的比活性,这是商业Pt / C的比活性的5倍。
更新日期:2019-11-06
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