首页|Unraveling the oxygen evolution activity of biomass-derived porous carbon plate as self-supported metal-free electrocatalyst for water splitting
Unraveling the oxygen evolution activity of biomass-derived porous carbon plate as self-supported metal-free electrocatalyst for water splitting
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Developing the efficient and low-cost electrocatalysts derived from biomass is a desired solution to address economy and sustainability challenges of hydrogen production from water electrolysis due to utilizing metal-based catalysts.Herein,the peeled cornstalk-derived porous carbon plates synthesized by salt template-assisted high-temperature pyrolysis are utilized as self-supported metal-free electrocatalysts to unravel the oxygen evo-lution activity for alkaline water splitting.The resultant PC-700-10 honeycomb carbon catalyst exhibits the su-perior electrocatalysis for oxygen evolution owning to its high specific surface area of 52.0 m2 g-1,suitable micro-and meso-pores,electron-withdrawing pyridinic-N moiety and appropriate balance between hydrophilicity and electroconductivity.Theoretical calculations reveal that the largest energy barrier of forming*OOH limits the OER rate and*OH oxidation generates the energetically more favorable epoxide intermediate.This finding opens the way to construct the hopeful metal-free OER electrocatalysts via regulating their intrinsic structure,and in-spires the applications of waste biomass in the energy-correlated fields.
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