Unraveling the oxygen evolution activity of biomass-derived porous carbon plate as self-supported metal-free electrocatalyst for water splitting  

作　　者：Xinghe Zhang Yujie Wang Jin Zou Sushan Zhao Hongbo Hou Wenhua Yao Huaipeng Wang 

机构地区：[1]College of Resource and Environment,Baoshan University,Baoshan,678000,PR China [2]School of Integrated Circuits,Tsinghua University,Beijing,100084,PR China

出　　处：《Progress in Natural Science:Materials International》2024年第5期967-976,共10页自然科学进展·国际材料(英文版)

基　　金：supported by the Special Basic Cooperative Research Programs of Yunnan Provincial Undergraduate Universities'Association(Grant No. 202101BA070001-083);Yunnan Fundamental Research Projects (Grant No. 202201AU070151);Baoshan University National Research Cultivation Fund Project (BYPY202211)

摘　　要：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 metalbased 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 evolution activity for alkaline water splitting. The resultant PC-700-10 honeycomb carbon catalyst exhibits the superior electrocatalysis for oxygen evolution owning to its high specific surface area of 52.0 m^(2)g^(-1), suitable microand 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 inspires the applications of waste biomass in the energy-correlated fields.

关 键 词：Oxygen evolution reaction Cornstalk Hierarchical pore Pyridinic-N Self-supported 

分 类 号：TQ116.21[化学工程—无机化工] TQ426