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Instruments / Technical Area	Publication Details	Published	Actions
B18-Core EXAFS	Self-supported Pt–CoO networks combining high specific activity with high surface area for oxygen reduction Gustav W. Sievers , Anders W. Jensen , Jonathan Quinson , Alessandro Zana , Francesco Bizzotto , Mehtap Oezaslan , Alexandra Dworzak , Jacob J. K. Kirkensgaard , Thomas E. L. Smitshuysen , Shima Kadkhodazadeh , Mikkel Juelsholt , Kirsten M. Ø. Jensen , Kirsten Anklam , Hao Wan , Jan Schäfer , Klára Čépe , María Escudero-Escribano , Jan Rossmeisl , Antje Quade , Volker Brüser , Matthias Arenz Nature Materials 2 DOI: 10.1038/s41563-020-0775-8 Diamond Proposal Number(s): [12746] Show Abstract ▼ Abstract: Several concepts for platinum-based catalysts for the oxygen reduction reaction (ORR) are presented that exceed the US Department of Energy targets for Pt-related ORR mass activity. Most concepts achieve their high ORR activity by increasing the Pt specific activity at the expense of a lower electrochemically active surface area (ECSA). In the potential region controlled by kinetics, such a lower ECSA is counterbalanced by the high specific activity. At higher overpotentials, however, which are often applied in real systems, a low ECSA leads to limitations in the reaction rate not by kinetics, but by mass transport. Here we report on self-supported platinum–cobalt oxide networks that combine a high specific activity with a high ECSA. The high ECSA is achieved by a platinum–cobalt oxide bone nanostructure that exhibits unprecedentedly high mass activity for self-supported ORR catalysts. This concept promises a stable fuel-cell operation at high temperature, high current density and low humidification.	Aug 2020
	Understanding the thermal stability of silver nanoparticles embedded in a-Si Anna L. Gould , Shima Kadkhodazadeh , Jakob B. Wagner , C. Richard A. Catlow , Andrew J. Logsdail , Marcel Di Vece The Journal Of Physical Chemistry C 119 (41), 23767 - 23773 DOI: 10.1021/acs.jpcc.5b07324 Open Access Show Abstract ▼ Abstract: The inclusion of silver plasmonic nanoparticles in silicon is highly relevant for photovoltaics as it may enhance optical absorption. We report an investigation of the stability of such pristine silver nanoparticles embedded in a-Si upon heat treatment. We have investigated the morphological changes via in situ and ex situ high-resolution and high-angle annular dark-field scanning transmission electron microscopy (HRTEM and HAADF STEM). The melting of Ag particles and subsequent interdiffusion of Ag and Si atoms are strongly related to the size of the Ag nanoparticles, as well as the presence of surface imperfections. Partial voids in the amorphous-Si framework are formed where sections of the Ag nanoparticles are found preferentially to diffuse away due to geometric instability. Computational simulations using ensemble molecular dynamics confirm the experimental results: the structural properties of the amorphous-Si environment are important as well as incomplete packing of the Ag nanoparticle surfaces. These factors affect the melting temperature, causing some parts of the Ag nanoparticles to dissolve preferentially and other areas to remain stable at high temperatures.	Oct 2015

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