Atomically dispersed Co in a cross-channel hierarchical carbon-based electrocatalyst for high-performance oxygen reduction in Zn–air batteries

Abstract

Rationally designing the metal active sites and triple-phase interfaces are essential to enhance the catalytic oxygen reduction reaction (ORR) performance of single atom catalysts (SACs). Yet the exposure and intrinsic...

Highly exposed surface pore-edge FeNx sites for enhanced oxygen reduction performance in Zn-air batteries

“…2a) displays that isolated bright dots can be observed in SPE-FeN x -HPNC, demonstrating the existence of atomic Fe sites (yellow circles). Furthermore, pore structures in the carbon matrix can also be found (irregular green circles), 38 along with a single Fe atom near the pore edge. The N 2 adsorption-desorption isotherms are used to evaluate the porosity of Fe 3 C-NC, FeN x -HPNC, and SPE-FeN x -HPNC (Fig.…”

Rational Design and General Synthesis of High-Entropy Metallic Ammonium Phosphate Superstructures Assembled by Nanosheets

“…Two-dimensional (2D) nanomaterials have attracted much attention due to their high surface-area-to-volume ratio, short ion-diffusion paths, and fast charge transport. However, their application is limited because the materials are prone to agglomeration. , Compared with low-dimensional nanomaterials, which were limited by agglomeration, three-dimensional (3D) superstructure nanonetworks formed by an orderly arrangement of these low-dimensional nanomaterials exhibit better conductivity and porous channels while maintaining their own functions. , In addition, the 3D superstructures can not only improve the stability and anti-aggregation property of the structure but also facilitate the electrolyte to reach the electrode surface, ensuring rapid ion insertion and charge transfer. , These advantages make 3D superstructure nanomaterials promising for a variety of applications, such as electrocatalysis − and energy storage. , For instance, Xu et al synthesized a 3D honeycomb-like superstructure by a metal–organic framework nanoparticle-templated strategy; Zhu et al developed a microwave-selective heating strategy to prepare a novel coral-like TiO 2 -MXene/graphene superstructure for a high-performance lithium-ion battery. The superstructures ensure sufficient active sites and efficient mass diffusion.…”

“…5,6 These advantages make 3D superstructure nanomaterials promising for a variety of applications, such as electrocatalysis 7−10 and energy storage. 11,12 For instance, Xu et al 13 synthesized a 3D honeycomb-like superstructure by a metal−organic framework nanoparticle-templated strategy; Zhu et al 14 developed a microwave-selective heating strategy to prepare a novel coral-like TiO 2 -MXene/graphene superstructure for a high-performance lithium-ion battery. The superstructures ensure sufficient active sites and efficient mass diffusion.…”

High-performance zinc–air batteries enabled by hybridizing atomically dispersed FeN2 with Co3O4 nanoparticles

“…[25][26][27] Metal-nitrogen-carbon catalysts (M-N-Cs) have thrived in recent years due to their unique structures and properties, and are usually prepared as single-atom catalysts. [28][29][30] In particular, Fe-N-C nanomaterials have been emerging as the most appealing catalysts for the ORR and have triggered extensive research interest due to their high activity and stability. 31,32 Although Fe-N x congurations generally accounted for the active sites of Fe-N-Cs, the coordination number of nitrogen to iron is still under dispute.…”