Atomically dispersed Ni activates adjacent Ce sites for enhanced electrocatalytic oxygen evolution activity

Abstract

Manipulating the intrinsic activity of heterogeneous catalysts at the atomic level is an effective strategy to improve the electrocatalytic performances but remains challenging. Here, atomically dispersed Ni anchored on CeO 2 particles entrenched on peanut-shaped hollow nitrogen-doped carbon structures ( a -Ni/CeO 2 @NC) is rationally designed and synthesized. The as-prepared a -Ni/CeO 2 @NC catalyst exhibits substantially boosted intrinsic activity and greatly reduced overpotential for the electrocatalytic oxygen evolution reaction. Experimental and theoretical results demonstrate that the decoration of isolated Ni species over the CeO 2 induces electronic coupling and redistribution, thus resulting in the activation of the adjacent Ce sites around Ni atoms and greatly accelerated oxygen evolution kinetics. This work provides a promising strategy to explore the electronic regulation and intrinsic activity improvement at the atomic level, thereby improving the electrocatalytic activity.

Nitrogen Plasma Activates CoMn-Layered Double Hydroxides for Superior Electrochemical Oxygen Evolution

“…In addition, the RDS is during the formation of *OOH and is strongly influenced by the Co site . As shown in Figure d, the density states of CoMn-LDH and N@CoMn-LDH were further analyzed, and the d-band centers of the catalysts were brought closer to the Fermi energy level after nitrogen doping, suggesting improved metallic properties of the catalysts . The results further show that nitrogen doping improves the conductivity of the catalyst.…”

(FeMnCe)-co-doped MOF-74 with significantly improved performance for overall water splitting

“…The result implies stronger electronic interactions between Fe, Mn and Ce after the stability test. 74,75 The percentage of Ce 4+ decreases after the test, which may be due to the reduction of Ce 4+ to Ce 3+ during the OER. 71 More discussion about XPS results for initial FeMn 6 Ce 0.5 -MOF-74/NF can be found in the ESI †.…”

Efficient Removal of Antibiotic Resistance Genes through 4f‐2p‐3d Gradient Orbital Coupling Mediated Fenton‐Like Redox Processes

“…[37] Due to the activation of adjacent Ce sites by the introduction of Co, electrons on Ce sites are more easily transferred to the adsorbed PMS, making it easier to dissociate into SO 4 *, thereby improving its thermodynamic reaction energy. [38] Importantly, the adsorption energy of PMS at Ce sites on the CoÀ CVO surface (ΔE ads = *À , indicating that the modulation of electronic structure of e g significantly optimizes coupling strength with oxygen intermediates. In addition, due to differences in local microenvironment, OÀ O bond length of PMS at Ce site on CoÀ CVO was instantly elongated during the reaction process (from 1.461 Å to 2.139 Å), demonstrating the rapid activation of PMS on the catalyst surface (pure PMS l OÀ O = 1.459 Å) (Figure 4f).…”