Interfacial stress induced by the adaptive construction of hydrangea-like heterojunctions based on in situ electrochemical phase reconfiguration for highly efficient oxygen evolution reaction at high current density

Abstract

Activating the redox chemistry of transition metal catalysts to dynamically construct adaptive heterojunctions while incorporating lattice mismatch-induced interfacial stress/lattice strain is critical for designing electrocatalysts with high water oxidation activity....

Optimizing the hydrogen adsorption strength on interfacial Ru sites with WN for high-efficiency hydrogen evolution

“…2a and b, the introduction of Ru resulted in the transformation of WN to a spherical shape with heterogeneous size distribution, which was attributed to the stress action during the electrodeposition process. 28 The energy dispersive X-ray spectroscopy (EDS) elemental mappings revealed the uniform distribution of W, N and Ru elements in the obtained Ru NP-WN/CC (Fig. 2c).…”

Ultra-thin carbon-shell coated Ru/RuO2@C with rich grain boundaries for efficient and durable acidic water oxidation

“…This strain allows the active site of the catalyst to be fully exposed, thus modifying the microstructure of the material and ultimately improving its electrocatalytic activity. 35,36 Hence, the lattice strain in the grain boundaries can be one of the reasons for the high activity of Ru/RuO 2 @C.…”

“…29,30 The atoms at the grain boundaries are arranged more loosely than those inside the grain, and there are also many defects. To put it more specifically, introducing defect structures involving lattice strain, edge vacancies, and dislocations can significantly control the electronic states and atomic configurations in the vicinity of defects, [31][32][33][34][35][36] thereby altering the coordination environment of the active metal center and exposing more active sites, 37 thus increasing the intrinsic catalytic activity of RuO 2 . Therefore, considering that the catalytic reactions are more probable to occur at the edge of the catalyst, the construction of electrocatalysts with high grain boundary density can serve as an effective method to significantly increase the number of OER active sites.…”