Catalysis and Electrocatalysis at Nanoparticle Surfaces
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Again, this indicates that the surface P species dissolved into the solution through consecutive cycles.
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During this process, the Ni OH 2 crystallinity improves as stacking faults in the oxy-hydroxides disappear 34 , 37 , 38 , More detailed discussions concerning these changes encompassing the improved OER activity of Ni-based electrocatalysts are given below. The reduction characteristics continued to decrease after CV scans, occurring at the same time as the discussed structural and chemical transformations inset in Fig. Furthermore, the area of the two peaks exhibited an inverse trend after repeated scans Fig. However, the ratio between the two peaks approached approximately 0. Subbaraman et al.
An interaction that is too strong might slow the OER rate because of the excessive stabilization of the reaction intermediates. Likewise, the two different peaks at 1. Although some studies have demonstrated that the NiP x NiO y core-shell structure formed during electrocatalysis can enhance OER activity 11 , 12 , 13 , 15 , the source of this superior activity is not yet known. Therefore, this spontaneous phase transformation during the OER circumstance leads to such a high activity and stability. After completing this transformation, the outstanding OER activity is stably maintained.
These results offer new methods for the initial preparation of OER electrocatalysts that provide excellent catalytic performances. Carbon-supported Ni 2 P nanoparticles were prepared by thermal decomposition following a previously reported method After the precipitates formed, the reactor was cooled to room temperature and the Ni 2 P nanoparticles were collected.
Then, the prepared catalyst was washed several times and used without further purification. Then, the precipitates were filtered and washed in ethanol several times. The catalyst loading was set at 0.
For consecutive CV scans, the applied potentials were swept from 1. All measurements were standardized vs. RHE and were compensated for the solution resistance, which was obtained from electrochemical impedance spectroscopy. The frequency range was 0. We used various physicochemical techniques to perform ex situ characterizations of the Ni-P-O electrocatalyst.
Elemental analysis was conducted by EDS using a Titan 80— microscope. The Ni K edge was collected in fluorescence mode at room temperature. The experimental details were previously described Walter, M. Solar Water Splitting Cells. Cook, T. McCrory, C. Man, I. Universality in oxygen evolution electrocatalysis on oxide surfaces. ChemCatChem 3 , — Ren, J.
Energy Mater. Nardi, K. Bediako, D. Zhao, Y. Nitrogen-doped carbon nanomaterials as non-metal electrocatalysts for water oxidation. Stern, L.
Faraday Discuss. Ledendecker, M. Ni 2 P as a Janus catalyst for water splitting: the oxygen evolution activity of Ni 2 P nanoparticles. Energy Environ. Han, A. High catalytic activity for water oxidation based on nanostructured nickel phosphide precursors. Li, Z. Enhanced oxygen evolution reaction of metallic nickel phosphide nanosheets by surface modification. Yu, X. Carbon coated porous nickel phosphides nanoplates for highly efficient oxygen evolution reaction. Graphene-Co 3 O 4 nanocomposite as electrocatalyst with high performance for oxygen evolution reaction.
Zhuang, Z. Masa, J. Kanan, M. Science , — Friebel, D. Louie, M. Qian, L. Bode, H. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only. Could Venus have been habitable? Sep 20, New proton radius measurement with electrons favors "muon value" 12 hours ago. Inelastic vs. Interaction of Neutrons with Matter Sep 20, Average transverse momentum as a function of the longitudinal momentum Sep 19, List of unstable and unknown hexaquarks Sep 18, Related Stories.
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Sign in. Forgot Password Registration. What do you think about this particular story? Your message to the editors. Your email only if you want to be contacted back. Send Feedback. Results showed that electrocatalytic current at a given potential increases proportionally with nanoparticle density. Further, when individual nanoparticles were characterized using SPR microscopy, atomic force microscopy AFM and transmission electron microscopy TEM , good agreement was shown between the results, further validating the new technique.
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Journal information: Nature Nanotechnology. Provided by Arizona State University. This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only.