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Dynamic evolution of co species and morphological reconstruction on co-N-C during the nitrate reduction reaction in neutral solution

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Nano Research 2025年第1期18卷 164-172页

作者： Yuanlin Fu Xiaoting Yang Ya Yu Kang Zhou Xiaoyang Ye Aoxiang Zhang Xiaojiao Hou Bingbing Chen Fuqiang Fan Yuhang Li Yu Fu Department of Chemistry College of SciencesNortheastern UniversityShenyang 110819China Department of Physical Education Shen Yang Institute of Science and TechnologyShenyang 110167China Sungrow Power Supply co. Ltd.Hefei 230088China

The electrochemical nitrate reduction reaction(eNO_(3)^(-)RR)is considered an effective approach for converting nitrate-containing wastewater to *** adsorption and activation of NO_(3)^(-)is the critical step for many materials and the high energy barrier inhibits the continuation of the reduction *** co nanoparticles encapsulated in the carbon layer we prepared spontaneously react with NO_(3)^(-)and the resulting co^(2+)is then reduced by electroreduction to co^(0),which circulates *** resulted in overcoming the energy input required for NO_(3)^(-)adsorption and conversion,thereby increasing the catalytic *** the same time,the morphology of the catalyst reconstructed from a dodecahedron to an interwoven nanosheet structure and the increased surface area also gives it better *** obtained co(OH)_(2)@co-N-C has an excellent eNO_(3)^(-)RR of 2774.7μg·h^(-1)·cm^(-2)with a Faraday efficiency of 81.4%in neutral *** the same time,the material-modified electrode can run stably for more than 100 *** work provides a new idea for the design of co-based catalysts for eNO_(3)^(-)RR.

关键词： electrochemical nitrate reduction reaction co-based catalyst dynamic evolution of co species morphological reconstruction

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ZIF-derived co–N–C ORR catalyst with high performance in proton exchange membrane fuel cells

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Progress in Natural Science:Materials International 2020年第6期30卷 855-860页

作者： Ruixiang Wang Pengyang Zhang Yucheng Wang Yuesheng Wang Karim Zaghib Zhiyou Zhou State Key Laboratory of Physical Chemistry of Solid Surfaces Collaborative Innovation Center of Chemistry for Energy Materials College of Chemistry and Chemical Engineering Xiamen University Center of Excellence in Transportation Electrificationand Energy Storage Hydro Québec

Metal and nitrogen-doped carbon(M-N-C) materials have been considered as the most promising non-precious metal oxygen reduction(ORR) catalysts to replace expensive Pt catalysts. Due to high Fenton catalytic activity of Fe element and the resulting instability, co-based N–C(co–N–C) catalysts without Fenton catalytic activity should be a worthier ORR catalyst being explored. Although the high ORR activity of co–N–C catalyst has been demonstrated in aqueous half-cell tests, their performance under PEMFC working condition is still far away from that of state-of-the-art Fe–N–C catalysts. In this study, a high-performance co–N–C catalyst was synthesized by one-step pyrolyzing co-doped ZIF-8(zeolitic imidazolate framework-8) particles in-situ grown on the highsurface-area KJ600 carbon black with high electronic conductivity. The resulting co–N–C catalyst exhibited high intrinsic ORR activity, fast mass transfer rate and high electronic conductivity, and thus yielded a remarkable peak power density of 0.92 W cm-2in H2–O2PEMFC, which is comparable to state-of-the-art Fe–N–C *** strategy is helpful to synthesize highly active M-N-C ORR catalysts with improved mass transfer and electric conductivity.

关键词： Non-precious metal electrocatalysts Fuel cell Oxygen reduction co-based catalyst ZIF-8

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Recent advance on cobalt-based oxide catalyst for the catalytic removal of volatile organic compounds:A review

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Resources Chemicals and Materials 2022年第1期1卷 27-46页

作者： Xi Chen Shinong Yu Wei Liu Shuning Zhang Shuchen Liu Yang Feng Xuejun Zhang college of Environmental and Safety Engineering Shenyang University of Chemical TechnologyShenyang 110142China college of Science Shenyang University of Chemical TechnologyShenyang 110142China

As the main contributor to air pollution,lots of volatile organic compounds(VOCs)were emitted into the atmo-sphere due to the rapid urbanization and industrialization,threatening environmental safety and human *** oxidation has been verified as an efficient approach for VOCs elimination from industrial waste gas *** to the merits of cost-effective and high activity,cobalt-based catalysts have been considered as one of the most promising candidates for VOCs *** review systematically summarized the devel-opments achieved in the design of cobalt-based catalysts for VOCs removal over the past ***,the fabrication of single cobalt oxides,cobalt-based binary oxides and cobalt-based composites,as well as the modified cobalt-based oxides by the surface engineering strategies,such as doping technology and acid etching method are coherently ***,the corresponding kinetic models and mechanisms are also ***,considering the enormous challenges and opportunities in this field,the perspective with respect to future research on cobalt-based catalysts is proposed.

关键词： Catalytic oxidation co-based catalyst VOCs

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Effect of Different Morphologies Induced by Solvent on ZIF-67 Derived co@NC for Catalytic Phenol Hydrogenation

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分子催化（中英文） 2024年第5期38卷 399-408,I0001页

作者： WANG Dong-wei MA Zhan-wei LI Jing FENG Hu-lin HU Bin State Key Laboratory of Low Carbon Catalysis and Carbon Dioxide Utilization State Key Laboratory for Oxo Synthesis and Selective OxidationLanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China University of Chinese Academy of Sciences Beijing 100049China Fujian Zijin Mining and Metallurgy Testing Technology co. Ltd.Longyan364200China

The co@NC catalysts with different morphologies were prepared by two step process,solvent control growth and pyrolysis *** polyhedral co@NC-67P-450 catalyst has a relatively high coNx content and exhibits excellent phenol hydrogenation activity(conversion 96.9%)at 160℃,3 MPa,which is higher than that of leaf shaped co@NC-67L-450 catalyst(conversion 75.4%).We demonstrated co_(3)O_(4)was reduced to the co^(0)during the ***,coNx species contribute to the superior hydrogenation activity of *** co-based catalysts can be easily recovered through the magnetic separation and performed the high stability.

关键词： metal organic frameworks co-based catalyst morphology phenol hydrogenation

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