In-situ growth of ZnS/FeS heterojunctions on biomass-derived porous carbon for efficient oxygen reduction reaction

Enhancement of oxygen reduction activity and stability via introducing acid-resistant refractory Mo and regulating the near-surface Pt content

“…In order to address these problems, researchers have developed low Pt containing catalysts [8] , non-noble metal catalysts [9][10][11] , and non-metallic catalysts [12][13][14] . In terms of structure, they can be divided into nanoframes [15][16][17] , core-shell structures [18][19][20][21] , and alloy structures [22][23][24][25] , etc.…”

Flower‐like FeS Coated with Heteroatom (S,N)‐Doped Carbon as Highly Active and Durable Oxygen Reduction Electrocatalysts

“…The additional peak at 168.7 eV is assigned to S−O species with higher states due to surface oxidation . High resolution C 1s peaks of FeS@C‐800 can be resolved into four different peaks associated to C=C (284.8 eV), C=N (285.7 eV), C−S/C−N (286.8 eV) and O−C=O (289.0 eV) bonds, respectively (Figure d). This is another evidence pointing to the successful incorporation of nitrogen and sulfur atoms into the carbon layer.…”

“…However, as a transition metal sulfide, FeS has drawbacks such as instability, intrinsically poor conductivity and poor reactivity resulting from the insulating properties. Up to now, rather few reports exist on the use of FeS for ORR . These reports involve FeS usually loaded on graphene sheets via weak interactions.…”

Metal-Supported Biochar Catalysts for Sustainable Biorefinery, Electrocatalysis, and Energy Storage Applications: A Review

“…The metal sulfides were loaded on the biomass source before carbonization at 900 • C (2 h, N 2 atmosphere) using NaSCN, FeCl 3 , ZnCl 2 , and 2,2-bipyridine as reactants. HR-TEM and Mott-Schottky results indicated the formation of numerous FeS/ZnS heterojunctions, which reportedly have the effect of increasing the electron transfer rate [179,187] and enhancing the absorption capacity of O 2 molecules [186]. Furthermore, as both metal sulfides are semiconductors and heterojunctions are photo-responsive, the catalytic properties of the material can be enhanced via light irradiation.…”

“…Another popular strategy for enhancing ORR activity consists of introducing metal sulfides in carbon materials [181][182][183][184][185]. For instance, Jiang et al, obtained an excellent electrocatalyst and highly selective for the four-electron pathway in alkaline medium by incorporating FeS and ZnS in N, S-doped carbon derived from Sichuan pepper [186]. The metal sulfides were loaded on the biomass source before carbonization at 900 • C (2 h, N 2 atmosphere) using NaSCN, FeCl 3 , ZnCl 2 , and 2,2-bipyridine as reactants.…”