一种家蚕茧衍生具有蜂窝状结构的钴-锰共掺杂碳材料双功能电解水催化剂（英文）

Honeycomb-like Structured and Co-Mn Incorporated Carbon Materials Derived from Bombyx mori Cocoons Act as a Bifunctional Catalyst for Water Splitting

通过一步碳化石墨化过程,由家蚕茧制得了一种具有蜂窝状结构的氮钴锰共掺杂碳材料。该材料具有蜂窝状结构和高比表面积,同时由于暴露的钴-锰活性位点以及富含的吡啶氮和石墨氮,3%钴-锰/蚕茧的碳材料(3%Co-Mn/SCC)显示了高析氢反应活性,其初始电位和10 m A·cm^(-2)过电位分别只有121和155 m V,Tafel斜率为130 m V·dec^(-1),并且在酸性条件下具有很好的稳定性。与此同时,2%Co-Mn/SCC在碱性条件下表现出优异的析氧反应催化性能,具有较低的初始电位,Tafel斜率为143 m V·dec^(-1)。

Porous and graphene-type honeycomb-like structured N-doped and Co-Mn incorporated carbon materials derived from Bombyx mori silk cocoons were synthesized via one-step thermal carbonization and graphitization process.Due to the high specific surface area of honeycomb-like structure,the exposed Co-Mn active sites and the pyridine-N and graphitic-N,the prepared 3%Co-Mn/silk cocoon carbon materials(3%Co-Mn/SCC)exhibits good hydrogen evolution reaction(HER)performance with a low onset potential of 121 mV,a low overpotential of 155 mV at 10 mA·cm-2 and a Tafel slope of 130 mV·dec-1 as well as a long-term stability in acidic electrolyte.Meanwhile,the 2%Co-Mn/SCC also shows great oxygen evolution reaction(OER)performance in 1 mol·L-1 KOH with the lowest onset potential 1.5 mV and a Tafel slope of 143 mV·dec-1.This result demonstrates that MCo-Mn/SCC(M is the mass fraction of Co and Mn)possess both HER and OER catalytic activity and can act as a bifunctional catalyst for water electrolysis.