Hierarchical ultrathin NiFe-borate layered double hydroxide nanosheets encapsulated into biomass-derived nitrogen-doped carbon for efficient electrocatalytic oxygen evolution

Structural Regulation and Oxygen Reduction Reaction Activity of [Co(bpy)2BO2(OH)] and [Cu(bpy)(OH)]2– Complex Templated Borates

“…Compared with the untreated crystal samples (Figure S2), the surface of borate becomes rougher after heat treatment, and it can be observed that the surface is covered with C particles. In addition, the rough surface increases the specific surface area of the catalyst and provides more active sites for ORR . Energy-dispersive X-ray (EDX) mappings in Figure e–n demonstrate that Co/Cu, B, C, N, and O elements distribute homogeneously throughout Co–C-750 and Cu–C-750, respectively.…”

“…In addition, the rough surface increases the specific surface area of the catalyst and provides more active sites for ORR. 35 Energydispersive X-ray (EDX) mappings in Figure 6e 36 The existence of Co 3+ may be due to the unavoidable oxidation of Co 2+ in the air. Likewise, the XPS spectra of Cu 2p show seven peaks in Figure S5c.…”

“…Cu−C-750 shows a hysteresis loop in the range of 0.7−1.0 relative pressure, indicating a highly porous structure. 35 In sharp contrast, the Co−C-750 isotherm shows a clear hysteresis from 0.4 to 1.0 P/P 0 , indicating the presence of a mesoporous structure, which is consistent with the pore-size distribution curve in Figure 7b. A mesoporous structure enables more structural defects to occur and facilitates the transport of intermediates.…”

Waste-Derived Catalysts for Water Electrolysis: Circular Economy-Driven Sustainable Green Hydrogen Energy

“…The pig bristles can be efficiently decomposed with microwave heating, and the discharge of S facilitates the formation of Ag 2 S [41]. More recently, Miao and co-authors employed a microwave hydrothermal route to construct a NiFe-borate layered double hydroxide/biomass-derived N-doped carbon (NiFe-BLDH/NC) hybrid catalyst [93]. With multistage decentralized architecture, rich active sites, good electrical conductivity, and efficient charge/mass transfer kinetics, the NiFe-BLDH/NC shows high OER activities (η 10 = 243 mV, Tafel slope = 42.7 mV dec −1 ).…”

“…Regulating metal (hydr)oxides' properties can directly alter the catalytic performance of metal (hydr)oxides/carbon heterostructures. For instance, the intercalated borates in the hierarchical NiFe-borate LDH/N-doped carbon catalyst play a positive effect on the OER performance by improving the hydrophilicity, enlarging the surface area, populating electroactive sites, and providing abundant mass/charge transport pathways [93]. Alternatively, engineering a metal/oxide heterostructure on carbon materials is suggested to enhance the catalytic performance by the strong electronic interactions between the electroactive metals and oxides.…”