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Dissolution of Pt during Oxygen Reduction Reaction Produces Pt Nanoparticles
Analytical Chemistry ( IF 6.7 ) Pub Date : 2017-11-15 00:00:00 , DOI: 10.1021/acs.analchem.7b03121 Je Hyun Bae 1 , Ricardo F. Brocenschi 1 , Kim Kisslinger 2 , Huolin L. Xin 2 , Michael V. Mirkin 1, 3
Analytical Chemistry ( IF 6.7 ) Pub Date : 2017-11-15 00:00:00 , DOI: 10.1021/acs.analchem.7b03121 Je Hyun Bae 1 , Ricardo F. Brocenschi 1 , Kim Kisslinger 2 , Huolin L. Xin 2 , Michael V. Mirkin 1, 3
Affiliation
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The loss of Pt during the oxygen reduction reaction (ORR) affects the performance and economic viability of fuel cells and sensors. Our group previously observed the dissolution of Pt nanoelectrodes at moderately negative potentials during the ORR. Here we report a more detailed study of this process and identify its product. The nanoporous Pt surface formed during the ORR was visualized by AFM and high-resolution SEM, which also showed ∼5 nm sized Pt particles on the glass surface surrounding the electrode. The release of these nanoparticles into the solution was confirmed by monitoring their catalytically amplified collisions with a Hg-coated microelectrode used as the tip in the scanning electrochemical microscope (SECM).
中文翻译：
氧还原反应过程中Pt的溶解会产生Pt纳米颗粒
氧还原反应（ORR）期间Pt的损失会影响燃料电池和传感器的性能和经济可行性。我们的小组以前在ORR期间观察到在中等负电位下Pt纳米电极的溶解。在这里，我们报告了对该过程的更详细的研究，并确定了它的产品。通过AFM和高分辨率SEM可以观察到ORR过程中形成的纳米多孔Pt表面，该表面在电极周围的玻璃表面上还显示出约5 nm大小的Pt颗粒。这些纳米粒子释放到溶液中的方法是，通过使用汞包覆的微电极（在扫描电化学显微镜（SECM）中用作尖端）监测其催化放大的碰撞来确认。
更新日期：2017-11-15
中文翻译：
氧还原反应过程中Pt的溶解会产生Pt纳米颗粒
氧还原反应（ORR）期间Pt的损失会影响燃料电池和传感器的性能和经济可行性。我们的小组以前在ORR期间观察到在中等负电位下Pt纳米电极的溶解。在这里，我们报告了对该过程的更详细的研究，并确定了它的产品。通过AFM和高分辨率SEM可以观察到ORR过程中形成的纳米多孔Pt表面，该表面在电极周围的玻璃表面上还显示出约5 nm大小的Pt颗粒。这些纳米粒子释放到溶液中的方法是，通过使用汞包覆的微电极（在扫描电化学显微镜（SECM）中用作尖端）监测其催化放大的碰撞来确认。
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