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Nanoporous CoFe2O4 Loaded with Pt-Ag for Photocatalytic Hydrogen Evolution
JOM ( IF 2.1 ) Pub Date : 2021-06-21 , DOI: 10.1007/s11837-021-04762-3
Gege He , Yang Wen , Chen Ma , Xiangyang Li , Liqun Wang , Lumei Gao , Zhanbo Sun

Nanoporous CoFe2O4 loaded with Pt-Ag was prepared by dealloying melt-spun Al-Co-Fe-Pt-Ag ribbons and then calcining to increase their hydrogen evolution ability. Results revealed that noble Pt and Ag nanoparticles were homogeneously dispersed and loaded on CoFe2O4 nanosheets. When the precursor alloy was Al90.80Co3Fe6Pt0.08Ag0.12, the obtained sample exhibited the highest hydrogen evolution rate of approximately 2.36 mmol/h/g under full-spectrum irradiation, being 24 times that of CoFe2O4 without Pt or Ag. These analyses indicate that using the appropriate amount of Ag could promote visible-light absorption and Pt could serve as an electron sink for effective electron–hole pair separation. Moreover, the Schottky barrier that formed between the Pt-Ag phase and CoFe2O4 effectively suppressed recombination of electron–hole pairs and improved the utilization of photogenerated electrons. Simultaneous loading of Pt and Ag on CoFe2O4 resulted in a synergistic effect that contributed to the performance increase.



中文翻译:

负载 Pt-Ag 的纳米孔 CoFe2O4 用于光催化析氢

通过对熔纺Al-Co-Fe-Pt-Ag带进行脱合金,然后煅烧以提高其析氢能力,制备了负载Pt-Ag的纳米多孔CoFe 2 O 4。结果表明,贵重的 Pt 和 Ag 纳米颗粒均匀分散并负载在 CoFe 2 O 4纳米片上。当前体合金为Al 90.80 Co 3 Fe 6 Pt 0.08 Ag 0.12 时,所得样品在全光谱辐照下的析氢速率最高,约为2.36 mmol/h/g,是CoFe 2 O 4 的24倍不含铂或银。这些分析表明,使用适量的 Ag 可以促进可见光吸收,而 Pt 可以作为有效电子 - 空穴对分离的电子汇。此外,Pt-Ag 相和 CoFe 2 O 4之间形成的肖特基势垒有效地抑制了电子-空穴对的复合,提高了光生电子的利用率。在 CoFe 2 O 4上同时负载 Pt 和 Ag产生协同效应,有助于提高性能。

更新日期:2021-06-22
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