Co/CoS nanofibers with flower-like structure immobilized in carbonated porous wood as bifunctional material for high-performance supercapacitors and catalysts

Iron carbide nanoparticles supported on an N-doped carbon porous framework as a bifunctional material for electrocatalytic oxygen reduction and supercapacitors

“…The CV curves exhibit symmetrical shapes similar to rectangles and the current densities increase along with increasing scan rates, indicating the electric doublelayer capacitance and good rate performance of the as-prepared samples. 52 By comparing all charging/discharging responses, the time gradually decreased when the electrode was changed from Fe 3 C/PNCF to Fe 3 C/PNC and then to Fe 3 C/ NC, which demonstrates that the existence of the mesopores and the N-doped framework indeed has a positive effect on enhancing the whole capacitance. The specific capacitance of Fe 3 C/PNCF was calculated to be 385.3 F g −1 at 1 A g −1 , which is considerably higher than those of Fe 3 C/NC (119.3 F g −1 ) and Fe 3 C/PNC (148.4 F g −1 ) (Fig.…”

Cobalt Oxide-Decorated on Carbon Derived from Onion Skin Biomass for Li-Ion Storage Application

“…The greater prosity of Co-A-COS (1 M) could facilitate the ion transportation of the electrode/electrolyte interface, leading to a reduced charge transfer resistance, as demonstrated by the EIS curves shown in Figure 6f. The EIS curves show one high frequency semi-circle and a low frequency line corresponding to the charge-transfer process and the semi-infinite linear mass-transport of the ions, respectively [57]. The diameter of the semi-circle and slope of the line represent the charge transfer resistance and the diffusion resistance, respectively.…”

Manganese- and Nitrogen-Doped Biomass-Based Carbons as Catalysts for the Oxygen Reduction Reaction

“…In addition, transition metals or their hybrids, such as Fe-N [41,42], Co-CoS [43], and Ni [44], have been used in order to increase the activity of wood-derived carbons for ORR catalysts. A N, P, and S/Fe-codoped carbon (FBC-Fe) with A hierarchical porous structure was prepared of feculae bombycis (FB) and exhibited excellent long-term durability and a remarkable methanol resistance, as well as high electrocatalytic activity, with an onset potential of 0.92 V vs. RHE, and an electron transfer number of 4.1 for the ORR in alkaline media [45].…”

“…A wood-derived reduced graphene oxide-supported Fe-based catalyst showed ORR activity with the highest onset potential of 0.83 V vs. RHE and a limiting current density of 5.33 mA cm −2 [41]. A carbonized lignin-free wood (CLFW)@Co-CoS hybrid material has also been developed, where the porous wood pipe structure not only provides space for CoS and Co nanoparticles to load and transport electrolyte ions but also provides a large number of active sites, which improves the electrocatalytic properties of electrocatalysis [43]. However, wood-derived carbon material activities are still relatively moderate, and there is still a need to find a more efficient and optimized catalyst using a simple and easy synthesis route.…”