N₄-Vacancy-Functionalized Carbon for High-Rate Li-Ion Storage

Abstract

Although heteroatom doping and pore management separately influence the Li + adsorption and Li + diffusion properties, respectively, merging their functions into a single unit is intriguing and has not been fully investigated. Herein, we have successfully incorporated both heteroatom doping and pore management within the same functional unit of N 4 -vacancy motifs, which is realized via acid etching of formamide-derived Zn−N 4functionalized carbon materials (Zn 1 NC). The N 4 -vacancy-rich porous carbon (V-NC) renders multiple merits: (1) a high N content of 13.94 atom % for large Li-storage capacity, (2) edged unsaturated N sites favoring highly efficient Li + adsorption and desolvation, and (3) a shortening of the Li + diffusion length through N 4 vacancy, thereby enhancing the Li-storage kinetics and high-rate performance. This work serves as an inspiration for the creation of heteroatom-edged porous structures with controllable pore sizes for high-rate alkali-ion battery applications.

P-doped binary Ni/Fe–N–C for enhanced oxygen electrocatalysis performance

“…49 Raman spectroscopy provides the A D / A G ratio, which describes the defect level in carbon materials. 50,51 The A D / A G ratio of P-NiFe–NC (5.8) is significantly higher than those of Zn–NC (4.5) and NiFe–NC (2.5), implying that the incorporation of P induces more defective carbon, which is probably due to its bigger atom size compared to C and N, resulting in more lattice distortion compared to NiFe–NC. 52,53…”

“…Fossil fuel usage has increased steadily, resulting in severe environmental issues and energy difficulties. 1 In order to assure a sustainable future, many studies have been conducted on clean and effective energy conversion and storage technologies, such as metal-ion batteries, [2][3][4] hydrogen fuel cells, [5][6][7] and metal-air batteries (MABs). [8][9][10] Theoretically, Zn-air batteries (ZnABs) possess superior specific energy density due to the use of ambient air as the actual cathode, which enables the ZnABs to carry more Zn anode materials.…”

Constructing S-deficient nickel sulfide/N-doped carbon interface for improved water splitting activity

“…The presence of high N content is mainly attributed to the use of the unique C/N source of formamide. 25…”

“…The presence of high N content is mainly attributed to the use of the unique C/N source of formamide. 25 The C species can be divided into C-C, C-N, and C-O species (Fig. 3c); the C-N species in NiS@NC and NiS-NC@NF mainly contribute to the heteroatom N dopants, and the contribution of C-N species is more evident in NiS-NC@NF.…”

Approaching high-performance lithium storage materials of CoNiO2 microspheres wrapped coal tar pitch-derived porous carbon

“…Meanwhile, it offers rich electroactive sites for lithium ion adsorption and storage, enhancing the rate capability and cyclability. [24][25][26] Carbon nanotubes (CNTs), graphene or graphene oxides (GOs) were employed as modification materials owing to their high conductivity and large SSA. However, their current cost is still relatively high.…”