Integrating a metal framework with Co-confined carbon nanotubes as trifunctional electrocatalysts to boost electron and mass transfer approaching practical applications

Abstract

The facile and large-scale construction of robust and inexpensive trifunctional self-supporting electrodes for oxygen reduction reaction (ORR), oxygen evolution reaction (OER) and hydrogen reaction (HER) in metal-air batteries and water...

Ultralong nitrogen/sulfur Co‐doped carbon nano‐hollow‐sphere chains with encapsulated cobalt nanoparticles for highly efficient oxygen electrocatalysis

“…As shown in Figure 2A,B, in the range of 700-750°C, dicyandiamide is decomposed to produce reducing gas and nitrogen-carbon (CN x ). 41,42 A small amount of sulfate adsorbed at the surface of the carbon matrix also gets decomposed, further forming the N,S co-doped carbon materials. Meanwhile, Co 2+ and Zn 2+ ions are reduced and aggregated into cobalt-zinc NPs by the reducing gas, which serves as the seeds for the growth of the N,S-doped CNHSCs.…”

“…To elucidate the possible formation mechanism of such an intriguing chain nanostructure (taking Co‐CNHSC‐3 as a representative sample), TEM was employed to snapshot the morphology and size of the samples at different pyrolysis temperatures and times. As shown in Figure 2A,B, in the range of 700–750°C, dicyandiamide is decomposed to produce reducing gas and nitrogen–carbon (CN x ) 41,42 . A small amount of sulfate adsorbed at the surface of the carbon matrix also gets decomposed, further forming the N,S co‐doped carbon materials.…”

Hierarchically hollow N-doped carbon-cobalt nanoparticle heterointerface for efficient bifunctional oxygen electrocatalysis

“…1e showed two different kinds of fringe spacings of 0.205 and 0.34 nm corresponding to the (111) lattice plane of the Co metal phase and the (002) plane of graphitic carbon, respectively. 39,40 The corresponding selected area electron diffraction (SAED) pattern of a single cage was captured and analyzed (Fig. S8†), in which well-resolved concentric rings and occasional bright spots were clearly presented and indexed to the (111), (200), (220), and (311) planes of Co metal.…”

“…1e showed two different kinds of fringe spacings of 0.205 and 0.34 nm corresponding to the (111) lattice plane of the Co metal phase and the (002) plane of graphitic carbon, respectively. 39,40 The corresponding selected area electron Moreover, the EDS mapping analysis in Fig. 1f indicates a homogeneous distribution of C, N, and Co elements in the Co@HNCs (600) sample.…”