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Protein hydrogel networks: A unique approach to heteroatom self-doped hierarchically porous carbon structures as an efficient ORR electrocatalyst in both basic and acidic conditions
A heteroatom self-doped, hierarchically porous carbon (NSPC) was prepared from protein hydrogel networks. NSPC possesses highly catalytic activity and stability for ORR in both acidic and alkaline media.
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•N, S self-doped, porous carbon (NSPC) was prepared from protein hydrogel networks.•The synthesis strategy affords NSPC with tunable pore structures.•NSPC possesses highly catalytic activity for ORR in both acidic and alkaline media.•As a cathode for Zn-air batteries, NSPC shows higher stability and power density then Pt/C.
It is of great allure but still challenging to construct carbon-based metal free electrocatalysts to replace Pt-based ones for efficient ORR in both acidic and alkaline media. In this work, protein-hydrogel networks are demonstrated as a precursor for preparing N, S-codoped, hierarchically porous carbon (NSPC) materials with tunable pore structure. Of note, NSPC-0.2–900 possesses a high pore volume of 0.8552 cm³ g–1 and shows excellent ORR activity in both alkaline (Eonset, ∼0.93 vs. RHE) and acidic (Eoneset, ∼0.89 V vs RHE) media. As a cathode catalyst for zinc-air batteries, NSPC exhibits higher power density and better long-term durability than Pt/C does. The work presents a great potential of using protein as a precursor for preparing heteroatom doped, hierarchically porous carbon materials for energy and environmental applications.