Biomass derived porous nanostructured nitrogen doped carbon(PNC) has been extensively investigated as the electrode material for electrochemical catalytic reactions and rechargeable batteries. Biomass with and without...Biomass derived porous nanostructured nitrogen doped carbon(PNC) has been extensively investigated as the electrode material for electrochemical catalytic reactions and rechargeable batteries. Biomass with and without containing nitrogen could be designed and optimized to prepare PNC via hydrothermal carbonization, pyrolysis, and other methods. The presence of nitrogen in carbon can provide more active sites for ion absorption, improve the electronic conductivity, increase the bonding between carbon and sulfur, and enhance the electrochemical catalytic reaction. The synthetic methods of natural biomass derived PNC, heteroatomic co-or tri-doping into biomass derived carbon and the application of biomass derived PNC in rechargeable Li/Na batteries, high energy density Li-S batteries, supercapacitors, metal-air batteries and electrochemical catalytic reaction(oxygen reduction and evolution reactions, hydrogen evolution reaction) are summarized and discussed in this review. Biomass derived PNCs deliver high performance electrochemical storage properties for rechargeable batteries/supercapacitors and superior electrochemical catalytic performance toward hydrogen evolution, oxygen reduction and evolution, as promising electrodes for electrochemical devices including battery technologies, fuel cell and electrolyzer.展开更多
Amorphous molybdenum disulfide(MoS_(2))is a promising electrochemical catalyst for hydrogen evolution reaction(HER)due to more active sites exposed on the surface compared to its crystalline counterpart.In this study,...Amorphous molybdenum disulfide(MoS_(2))is a promising electrochemical catalyst for hydrogen evolution reaction(HER)due to more active sites exposed on the surface compared to its crystalline counterpart.In this study,a novel fast three-minute one-pot method is proposed to prepare the single-wall carbon nanotube-(SWCNT-)supported amorphous MoS_(2) via a microwave heating process.Compared to traditional hydro-or solvent thermal methods to prepare MoS_(2) which usually consume more than 10 hours,it is more promising for fast production.An overpotential at 10 mA/cm2 of amorphous MoS_(2)@SWCNT is 178 mV,which is 99mV and 22mV lower than crystalline MoS_(2)@SWCNT and pure amorphous MoS_(2),respectively.After running 1000 cycles of polarization,~2%increase in overpotential is observed,indicating its good stability.The enhanced performance results from the beneficial combination of the SWCNT substrate and the amorphous microstructures.The introduction of SWCNT increases catalyst conductivity and prevents MoS_(2) aggregation.The amorphous microstructures of MoS_(2) prepared by a microwave heating method lead to more Mo edges or active sites exposed.展开更多
基金the support from the USDA National Institute of Food and Agriculture, HSI Collaboration:Integrating Food Science/Engineering and Education Network(IFSEEN,award number: 2015-3842224059)the support from the NMSU Agricultural Experiment Station Graduate Research Award
文摘Biomass derived porous nanostructured nitrogen doped carbon(PNC) has been extensively investigated as the electrode material for electrochemical catalytic reactions and rechargeable batteries. Biomass with and without containing nitrogen could be designed and optimized to prepare PNC via hydrothermal carbonization, pyrolysis, and other methods. The presence of nitrogen in carbon can provide more active sites for ion absorption, improve the electronic conductivity, increase the bonding between carbon and sulfur, and enhance the electrochemical catalytic reaction. The synthetic methods of natural biomass derived PNC, heteroatomic co-or tri-doping into biomass derived carbon and the application of biomass derived PNC in rechargeable Li/Na batteries, high energy density Li-S batteries, supercapacitors, metal-air batteries and electrochemical catalytic reaction(oxygen reduction and evolution reactions, hydrogen evolution reaction) are summarized and discussed in this review. Biomass derived PNCs deliver high performance electrochemical storage properties for rechargeable batteries/supercapacitors and superior electrochemical catalytic performance toward hydrogen evolution, oxygen reduction and evolution, as promising electrodes for electrochemical devices including battery technologies, fuel cell and electrolyzer.
基金the Idaho National Laboratory Directed Research and Development Program under DOE Idaho Operations Office Contract DE-AC07-05ID14517.
文摘Amorphous molybdenum disulfide(MoS_(2))is a promising electrochemical catalyst for hydrogen evolution reaction(HER)due to more active sites exposed on the surface compared to its crystalline counterpart.In this study,a novel fast three-minute one-pot method is proposed to prepare the single-wall carbon nanotube-(SWCNT-)supported amorphous MoS_(2) via a microwave heating process.Compared to traditional hydro-or solvent thermal methods to prepare MoS_(2) which usually consume more than 10 hours,it is more promising for fast production.An overpotential at 10 mA/cm2 of amorphous MoS_(2)@SWCNT is 178 mV,which is 99mV and 22mV lower than crystalline MoS_(2)@SWCNT and pure amorphous MoS_(2),respectively.After running 1000 cycles of polarization,~2%increase in overpotential is observed,indicating its good stability.The enhanced performance results from the beneficial combination of the SWCNT substrate and the amorphous microstructures.The introduction of SWCNT increases catalyst conductivity and prevents MoS_(2) aggregation.The amorphous microstructures of MoS_(2) prepared by a microwave heating method lead to more Mo edges or active sites exposed.
