Nanoporous high-entropy alloys for highly stable and efficient catalysts

Abstract

A general dealloying strategy is developed to prepare multi-component alloys with high thermal stability, electrochemical durability, and catalytic activity.

Design of Complex Solid‐Solution Electrocatalysts by Correlating Configuration, Adsorption Energy Distribution Patterns, and Activity Curves

“…[4] Optimization of the composition allows for increasing the number of active sites with favorable adsorption energy for the reaction of interest, and thus,t he optimal choice of elements and their respective ratio can generate very active catalysts as long as aC SS phase is formed. Thes uccessful use of CSSs as electrocatalysts for several reactions,s uch as ammonia synthesis, [5] CO oxidation, [6] CO 2 reduction, [7] the ORR, [6,8] hydrogen evolution reaction (HER), [9][10][11] or the OER [9,11,12] was shown confirming universal applicability.H owever,t he complex underlying working principles are still widely unknown with al ack of ac onceptual framework. Hence,i ndepth understanding is required to tailor new catalysts for specific reactions.A djusting of the activity of ORR catalysts was shown experimentally by tailoring the CSS composition, [8] astrategy which could be rationalized by atheoretical study of the adsorption energy distribution pattern (AEDP) [4] and its implication on the specific electrochemical behavior.…”

Fast Site-to-site Electron Transfer of High-entropy Alloy Nanocatalyst Driving Redox Electrocatalysis

“…Pt mainly exists in the form of zero valences and a small amount of 2 + valence. 29 The Ni 2p spectra display the coexistence of Ni 0 (852.8 eV) and Ni 2+ (855.6 eV) and a satellite peak locate at 861.6 eV ( Supplementary Fig. 2c), the content of Ni 0 is lower than the content of Ni 2+ because of the high chemical activity of Ni.…”

“…[23][24][25] Recently, some HEAs had used as catalysts for electrocatalytic reactions, which display superior stability and catalytic selectivity and activity compared with traditional alloys. 13,[26][27][28][29][30] However, the traditional method mainly produce bulk HEAs rather than nanostructures. 26,[31][32][33][34] Moreover, the preparation of uniform nanostructured HEAs with small size (< 10 nm) currently requires speci c equipment (fast heating/cooling rate, ~10 5 K per second), high temperature (~2000 kelvin), and high temperature resistant and conductive substrate (carbon nano ber), such as carbon-thermal shock method.…”

Design von komplexen Mischkristall‐Elektrokatalysatoren auf Basis der Korrelation von Konfiguration, Verteilungsmustern der Adsorptionsenergie und Aktivitätskurven

“…Der erfolgreiche Einsatz von CSSs als Elektrokatalysatoren fürv erschiedene Reaktionen wie z. B. die Ammoniaksynthese, [5] die CO-Oxidation, [6] die CO 2 -Reduktion, [7] die ORR, [6,8] die Wasserstoffentwicklungsreaktion, [9][10][11] oder die OER [9,11,12] hat die universelle Anwendbarkeit bestätigt. Die komplexen Arbeitsprinzipien sind jedoch noch weitgehend unbekannt, da das konzeptionelle Verständnis fehlt, um neue Katalysatoren fürs pezifische Reaktionen maßzuschneidern.…”