@article{6ae023128e074fcc96b1995ddc7c51ec,
title = "Electrochemically Induced Strain Evolution in Pt-Ni Alloy Nanoparticles Observed by Bragg Coherent Diffraction Imaging",
abstract = "Strain is known to enhance the activity of the oxygen reduction reaction in catalytic platinum alloy nanoparticles, whose inactivity is the primary impediment to efficient fuel cells and metal-air batteries. Bragg coherent diffraction imaging (BCDI) was employed to reveal the strain evolution during the voltammetric cycling in Pt-Ni alloy nanoparticles composed of Pt2Ni3, Pt1Ni1, and Pt3Ni2. Analysis of the 3D strain images using a core-shell model shows that the strain as large as 5% is induced on Pt-rich shells due to Ni dissolution. The composition dependency of the strain on the shells is in excellent agreement with that of the catalytic activity. The present study demonstrates that BCDI enables quantitative determination of the strain on alloy nanoparticles during electrochemical reactions, which provides a means to exploit surface strain to design a wide range of electrocatalysts.",
keywords = "alloy nanoparticles, coherent diffraction, electrocatalysts, strain",
author = "Tomoya Kawaguchi and Vladimir Komanicky and Vitalii Latyshev and Wonsuk Cha and Maxey, {Evan R.} and Ross Harder and Tetsu Ichitsubo and Hoydoo You",
note = "Funding Information: The X-ray measurements and electrochemistry performed at Argonne (T.K., V.K., W.C., R.H., H.Y.) were supported by the U.S. Department of Energy (DOE), Office of Basic Energy Science (BES), Materials Sciences and Engineering Division, and the use of the Advanced Photon Source (APS) was made available by the DOE BES Scientific User Facilities Division under contract no. DE-AC02-06CH11357. The data analyses at Tohoku University (T.K., T.I.) were supported by JSPS KAKENHI grant no. 19K15307. The analyses were supported by the Center for Computational Materials Science, Institute for Materials Research, Tohoku University (proposal no. 20S0405). The sample preparation (V.K., V.L.) at Safarik University was supported by VEGA grant no. 1/0204/18 and grants from the Slovak Research and Development Agency under contract nos. APVV-17-0059 and APVV-18-0358. Funding Information: The X-ray measurements and electrochemistry performed at Argonne (T.K., V.K., W.C., R.H., H.Y.) were supported by the U.S. Department of Energy (DOE), Office of Basic Energy Science (BES) Materials Sciences and Engineering Division, and the use of the Advanced Photon Source (APS) was made available by the DOE BES Scientific User Facilities Division under contract no. DE-AC02-06CH11357. The data analyses at Tohoku University (T.K., T.I.) were supported by JSPS KAKENHI grant no. 19K15307. The analyses were supported by the Center for Computational Materials Science, Institute for Materials Research Tohoku University (proposal no. 20S0405). The sample preparation (V.K. V.L.) at Safarik University was supported by VEGA grant no. 1/0204/18 and grants from the Slovak Research and Development Agency under contract nos. APVV-17-0059 and APVV-18-0358. Publisher Copyright: {\textcopyright} 2021 American Chemical Society.",
year = "2021",
month = jul,
day = "28",
doi = "10.1021/acs.nanolett.1c00778",
language = "English",
volume = "21",
pages = "5945--5951",
journal = "Nano Letters",
issn = "1530-6984",
publisher = "American Chemical Society",
number = "14",
}