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Engineering the morphology and electronic structure of atomic cobalt-nitrogen-carbon catalyst with highly accessible active sites for enhanced oxygen reduction 被引量:2
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作者 Zhijun Li Leipeng Leng +7 位作者 Siqi Ji Mingyang Zhang hongxue liu Jincheng Gao Jiangwei Zhang J.Hugh Horton Qian Xu Junfa Zhu 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2022年第10期469-477,I0012,共10页
The stabilization of non-precious metals as isolated active sites with high loading density over nitrogendoped carbon materials is essential for realizing the industrial application of single atom catalysts.However,ac... The stabilization of non-precious metals as isolated active sites with high loading density over nitrogendoped carbon materials is essential for realizing the industrial application of single atom catalysts.However,achieving high loading of single cobalt active sites with greatly enhanced oxygen reduction reaction(ORR)activity and stability remains challenging.Here,an efficient approach was described to create a single atom cobalt electrocatalyst(Co SAs/NC)which possesses enhanced mesoporosity and specific surface area that greatly favor the mass transportation and exposure of accessible active sites.The electronic structure of the catalyst by the strong metal-support interaction has been elucidated through experimental characterizations and theoretical calculations.Due to dramatically enhanced mass transport and electron transfer endowed by morphology and electronic structure engineering,Co SAs/NC exhibits remarkable ORR performance with excellent activity(onset and half-wave potentials of 1.04 V(RHE)and 0.90 V(RHE),Tafel slope of 69.8 mV dec^(-1)and J_(k) of 18.8 mA cm^(-2)at 0.85 V)and stability(7 mV activity decay after 10,000 cycles).In additio n,the catalyst demonstrates great promise as an alternative to traditional Pt/C catalyst in zinc-air batteries while maintaining high performance in terms of high specific capacity of(796.1 mAh/g_(Zn)),power density(175.4 mW/cm^(2)),and long-term cycling stability(140 h).This study presents a facile approach to design SACs with highly accessible active sites for electrochemical transformations. 展开更多
关键词 Single atom electrocatalyst Non-precious metal Coordination environment Oxygen reduction reaction Catalytic activity Zn-air battery
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Rapid, cost-effective DNA quantification via a visuallydetectable aggregation of superparamagnetic silicamagnetite nanoparticles 被引量:2
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作者 Qian liu Jingyi Li +6 位作者 hongxue liu Ibrahim Tora Matthew S. Ide Jiwei Lu Robert J. Davis David L. Green James P. Landers 《Nano Research》 SCIE EI CAS CSCD 2014年第5期755-764,共10页
DNA and silica-coated magnetic particles entangle and form visible aggregates under chaotropic conditions with a rotating magnetic field, in a manner that enables quantification of DNA by image analysis. As a means of... DNA and silica-coated magnetic particles entangle and form visible aggregates under chaotropic conditions with a rotating magnetic field, in a manner that enables quantification of DNA by image analysis. As a means of exploring the mechanism of this DNA quantitation assay, nanoscale SiO2-coated Fe304 (Fe3O4@SiO2) particles are synthesized via a solvothermal method. Characterization of the particles defines them to be -200 nm in diameter with a large surface area (141.89 m2/g), possessing superparamagnetic properties and exhibiting high saturation magnetization (38 emu/g). The synthesized Fe3O4@SiO2 nanoparticles are exploited in the DNA quantification assay and, as predicted, the nanoparticles provide better sensitivity than commercial microscale Dynabeads for quantifying DNA, with a detection limit of 4 kilobase-pair fragments of human DNA. Their utility is proven using nanoparticle DNA quantification to guide efficient polymerase chain reaction (PCR) amplification of short tandem repeat loci for human identification. 展开更多
关键词 silica/magnetite CORE-SHELL SUPERPARAMAGNETIC DNA quantification polymerase chain reaction(PCR)
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