Experimental And Theoretical Characteristic Of Single Atom Co-N-C Catalyst For Li-O2 Batteries

Abstract

Single atom CoN -C can be used as a low-cost cathode catalyst for Li-O 2 batteries (LOBs) with abundant highly active sites and high efficient atom utilizations. In the present work, hierarchical porous single atom CoN -C catalyst was prepared through acid etching from a Co/Co-N-C intermediate, featuring an efficient slack of volume expansion, easy mass transmission via the interconnected carbon-framework, and sufficient surface area to accommodate discharge products. The single atom CoN -C catalyst exhibited a superior catalytic capacity for LOBs with a large specific capacity of 14075 mAh g-1 and a long cycle life of 340 cycles. The oxygen reduction reaction (ORR) / oxygen evolution reaction (OER) mechanisms of the discharge products of single atom CoN -C catalyst were identified by using density functional theory (DFT) calculations, showing avenues for improving the future design of single atom catalyst.

Two‐Step Deposition Approach for Lead Free (NH4)3Sb2I9 Perovskite Solar Cells with Enhanced Open Circuit Voltage and Performance

“…Production of green energy units including hydrogen, [1–6] batteries, [7–11] supercapacitors [12–14] and solar cells [15] by low‐cost methods is of great importance. Solar energy harvesting using perovskite or perovskite‐like materials is trending due to cost‐effective and simple fabrication techniques [15–29] .…”

Nickel–cobalt oxalate as an efficient non-precious electrocatalyst for an improved alkaline oxygen evolution reaction

“…[12][13][14][15] For example, non-oxide electrocatalyst of Cobalt (Co) is well-known for metallic nature, which encourages massive application in practical sense. [16][17][18] There are quite a few literatures on non-precious non-oxide electrocatalyst for alkaline OER application such as Co 4 N, (Co 0.7 Fe 0.3 ) 2 B, (Co x Fe 1-x ) 2 P and Co 0.85 Se/Co 9 Se 8 etc. [19][20][21][22] Thus, non-precious non-oxide electrocatalyst stimulates great attention for alkaline OER.…”

Surface Phosphatization for a Sawdust‐Derived Carbon Catalyst as Kinetics Promoter and Corrosion Preventer in Lithium–Oxygen Batteries

“…The X‐ray diffraction (XRD) patterns of the samples in Figure a show two broad peaks at 2θ angles of 24° and 42.7°, indexed to the (002) and (101) planes of graphite for the SPC catalyst, respectively. [ 29,41–43 ] It can be seen that the degree of graphitization increased with the increase in the content of the P source in the synthesis process. A similar result was also observed in the Raman spectra, shown in Figure 2b.…”

“…The peak at ≈56.1 eV appeared in the Li 1s profiles belonging to the Li 2− x O 2 phase, while the additional peak located at 55.0 eV was attributed to the Li 2 O 2 phase. [ 42,56–58 ] At the initial stage of discharge (200 mAh g –1 ), the main product was Li 2− x O 2 , which is a mixture of LiO 2 and Li 2 O 2 for both samples. Li 2− x O 2 transformed into Li 2 O 2 owing to the depth of discharge (1000 mAh g –1 ) for the SC electrode.…”