Cargando…

Is There Anything Better than Pt for HER?

[Image: see text] The search for cheap and abundant alternatives to Pt for the hydrogen evolution reaction (HER) has led to many efforts to develop new catalysts. Although the discovery of promising catalysts is often reported, none can compete with Pt in intrinsic activity. To enable true progress,...

Descripción completa

Detalles Bibliográficos
Autores principales: Hansen, Johannes Novak, Prats, Hector, Toudahl, Karl Krøjer, Mørch Secher, Niklas, Chan, Karen, Kibsgaard, Jakob, Chorkendorff, Ib
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2021
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8155388/
https://www.ncbi.nlm.nih.gov/pubmed/34056107
http://dx.doi.org/10.1021/acsenergylett.1c00246
_version_ 1783699191499849728
author Hansen, Johannes Novak
Prats, Hector
Toudahl, Karl Krøjer
Mørch Secher, Niklas
Chan, Karen
Kibsgaard, Jakob
Chorkendorff, Ib
author_facet Hansen, Johannes Novak
Prats, Hector
Toudahl, Karl Krøjer
Mørch Secher, Niklas
Chan, Karen
Kibsgaard, Jakob
Chorkendorff, Ib
author_sort Hansen, Johannes Novak
collection PubMed
description [Image: see text] The search for cheap and abundant alternatives to Pt for the hydrogen evolution reaction (HER) has led to many efforts to develop new catalysts. Although the discovery of promising catalysts is often reported, none can compete with Pt in intrinsic activity. To enable true progress, a rigorous assessment of intrinsic catalytic activity is needed, in addition to minimizing mass-transport limitations and following best practices for measurements. Herein, we underline the importance of measuring intrinsic catalytic activities, e.g., turnover frequencies (TOFs). Using mass-selected, identical Pt nanoparticles at a range of loadings, we show the pervasive impact of mass-transport limitations on the observed activity of Pt in acid. We present the highest TOF measured for Pt at room temperature. Since our measurements are still limited by mass transport, the true intrinsic HER activity for Pt in acid is still unknown. Using a numerical diffusion model, we suggest that hysteresis in cyclic voltammograms arises from H(2) oversaturation, which is another indicator of mass-transport limitations.
format Online
Article
Text
id pubmed-8155388
institution National Center for Biotechnology Information
language English
publishDate 2021
publisher American Chemical Society
record_format MEDLINE/PubMed
spelling pubmed-81553882021-05-28 Is There Anything Better than Pt for HER? Hansen, Johannes Novak Prats, Hector Toudahl, Karl Krøjer Mørch Secher, Niklas Chan, Karen Kibsgaard, Jakob Chorkendorff, Ib ACS Energy Lett [Image: see text] The search for cheap and abundant alternatives to Pt for the hydrogen evolution reaction (HER) has led to many efforts to develop new catalysts. Although the discovery of promising catalysts is often reported, none can compete with Pt in intrinsic activity. To enable true progress, a rigorous assessment of intrinsic catalytic activity is needed, in addition to minimizing mass-transport limitations and following best practices for measurements. Herein, we underline the importance of measuring intrinsic catalytic activities, e.g., turnover frequencies (TOFs). Using mass-selected, identical Pt nanoparticles at a range of loadings, we show the pervasive impact of mass-transport limitations on the observed activity of Pt in acid. We present the highest TOF measured for Pt at room temperature. Since our measurements are still limited by mass transport, the true intrinsic HER activity for Pt in acid is still unknown. Using a numerical diffusion model, we suggest that hysteresis in cyclic voltammograms arises from H(2) oversaturation, which is another indicator of mass-transport limitations. American Chemical Society 2021-03-19 2021-04-09 /pmc/articles/PMC8155388/ /pubmed/34056107 http://dx.doi.org/10.1021/acsenergylett.1c00246 Text en © 2021 The Authors. Published by American Chemical Society Permits non-commercial access and re-use, provided that author attribution and integrity are maintained; but does not permit creation of adaptations or other derivative works (https://creativecommons.org/licenses/by-nc-nd/4.0/).
spellingShingle Hansen, Johannes Novak
Prats, Hector
Toudahl, Karl Krøjer
Mørch Secher, Niklas
Chan, Karen
Kibsgaard, Jakob
Chorkendorff, Ib
Is There Anything Better than Pt for HER?
title Is There Anything Better than Pt for HER?
title_full Is There Anything Better than Pt for HER?
title_fullStr Is There Anything Better than Pt for HER?
title_full_unstemmed Is There Anything Better than Pt for HER?
title_short Is There Anything Better than Pt for HER?
title_sort is there anything better than pt for her?
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8155388/
https://www.ncbi.nlm.nih.gov/pubmed/34056107
http://dx.doi.org/10.1021/acsenergylett.1c00246
work_keys_str_mv AT hansenjohannesnovak isthereanythingbetterthanptforher
AT pratshector isthereanythingbetterthanptforher
AT toudahlkarlkrøjer isthereanythingbetterthanptforher
AT mørchsecherniklas isthereanythingbetterthanptforher
AT chankaren isthereanythingbetterthanptforher
AT kibsgaardjakob isthereanythingbetterthanptforher
AT chorkendorffib isthereanythingbetterthanptforher