Enhanced Electrocatalytic Performance through Body Enrichment of Co‐Based Bimetallic Nanoparticles In Situ Embedded Porous N‐Doped Carbon Spheres

Abstract

Extending available body space loading active species and controllably tailoring the d‐band center to Fermi level of catalysts are of paramount importance but extremely challenging for the enhancement of electrocatalytic performance. Herein, a melamine‐bridged self‐construction strategy is proposed to in situ embed Co‐based bimetallic nanoparticles in the body of N‐doped porous carbon spheres (CoM‐e‐PNC), and achieve the controllable tailoring of the d‐band center position by alloying of Co and another transition metal M (M = Ni, Fe, Mn, and Cu). The enrichment and exposure of the active sites in the body interior of porous carbon spheres, and the best balance between the adsorption of OH species and the desorption of O2 induced by optimizing the d‐band center position, collectively enhance the oxygen evolution reaction (OER) performance. Meanwhile, the relationship of d‐band center position and OER activity is found to exhibit the volcano curve rule, where the CoNi‐e‐PNC catalyst shows optimal OER performance with an overpotential of 0.24 V at 10 mA cm−2 in alkaline media, outperforming those of the ever‐reported CoNi‐based catalysts. Besides, CoNi‐e‐PNC catalyst also demonstrates high OER stability with slight current decrease after 100 h.

Coordinated Adsorption and Catalytic Conversion of Polysulfides Enabled by Perovskite Bimetallic Hydroxide Nanocages for Lithium‐Sulfur Batteries

“…The interaction between bimetals also adjusts the electron filling of d‐band and tailors the d‐band center position, thereby achieving appropriate bond strength and boosting catalytic activity. [ 37–39 ]…”

Rare-earth-regulated Ru-O interaction within the pyrochlore ruthenate for electrocatalytic oxygen evolution in acidic media

“…When Nb was replaced by Sm, Gd and Yb, the Ru 4d band center descended further away from the Fermi level, leading to worse OER activity than Nd because of impeded adsorption of oxygen intermediates, which hampered the OER kinetics. The Ru 4d band center of Yb 2 Ru 2 O 7 was about −2.6 eV, which was too far from the Femi level, resulting in further decreased ability to adsorb oxygen intermediates on Ru sites [52].…”

Strategies to improve electrocatalytic and photocatalytic performance of two-dimensional materials for hydrogen evolution reaction

“…Single atom catalysts (SACs) represent a new direction for the development of novel materials [276][277][278][279]. Using melamine as a precursor, cobalt-based bimetallic catalysts supported on nitrogen-doped porous carbon spheres (CoM-NC) were prepared [280]. The electronic structure of the d-band could be controlled by doping the catalyst with different metal elements.…”