Vacuum vapor migration strategy for atom–nanoparticle composite catalysts boosting bifunctional oxygen catalysis and rechargeable Zn–air batteries

Abstract

Reasonable design of bifunctional catalysts for oxygen reduction reactions (ORR) and oxygen evolution reactions (OER) is of great importance for the large-scale deployment of metal-air batteries. Herein, we developed a...

In situspace-confined growth of Co3O4nanoparticles inside N-doped hollow porous carbon nanospheres as bifunctional oxygen electrocatalysts for high-performance rechargeable zinc–air batteries

“…It was reported that the catalytic Co active sites can promote the graphitization of carbon in high temperature pyrolysis. 48–50 Fig. 1f shows the high-resolution TEM image of an embedded Co 3 O 4 nanoparticle.…”

“…It was reported that the catalytic Co active sites can promote the graphitization of carbon in high temperature pyrolysis. [48][49][50] Fig. 1f 2b, which correspond to the edge, distorted carbon and structure defects (D-band) and the graphitic sp 2 carbon (G-band), respectively.…”

Low-Loading Sub-3 nm PtCo Nanoparticles Supported on Co–N–C with Dual Effect for Oxygen Reduction Reaction in Proton Exchange Membrane Fuel Cells

“…As for PtCo/Co–N–C, metallic Co 0 emerges and the ratio of Co–N x decreases apparently, fully proving that the Co–N x bonds are broken, and the Co atoms are segregated into the lattice of Pt after annealing under a H 2 /Ar atmosphere. In addition, PtCo/Co–N–C (780.70 eV) shows a positive shift in the binding energy of Co 2p 3/2 compared to Pt/Co–N–C (780.10 eV), implying that the electronic structure of Co is modulated, which may be induced by the enhanced metal–support interplay between PtCo nanoparticles and Co–N–C carriers . The high-resolution Pt 4f XPS spectra can be split into Pt 4f 7/2 and Pt 4f 5/2 , containing Pt(0) and Pt­(II), in which Pt(0) is considered to be the main active center of the ORR process.…”

Tailoring charge reconfiguration in dodecahedral Co2P@carbon nanohybrids by triple-doping engineering for promoted reversible oxygen catalysis

“…Within this context, it is of practical value to design a highly efficient and durable bi-functional ORR–OER catalyst for ZABs. 9–11…”

“…Within this context, it is of practical value to design a highly efficient and durable bi-functional ORR-OER catalyst for ZABs. [9][10][11] Recently, carbon/transition-metal phosphide (TMP) nanohybrids with nanoconnement structures have received extensive and continuous interest because of their unique features of spatial connement and functional integration, thus making them attractive for potential utilization in energy-related electrocatalysis areas. 12,13 Many early studies have demonstrated that constructing these N-doped carbon (NDC) frameworks with conned phosphide-based moieties represents a feasible strategy to ne-tune the electronic interactions between the embedded metal phosphide particles and their adjacent carbon-based substrates, thereby enhancing the intrinsic activities of the catalysts.…”