For high-efficiency NH_(3)synthesis via ambient-condition electrohydrogenation of inert N_(2),it is pivotal to ingeniously design an active electrocatalyst with multiple features of abundant surfacial deficiency,good ...For high-efficiency NH_(3)synthesis via ambient-condition electrohydrogenation of inert N_(2),it is pivotal to ingeniously design an active electrocatalyst with multiple features of abundant surfacial deficiency,good conductivity and large surface area.Here,oxygen-deficient SnO_(2)nanoparticles encapsulated by ultrathin carbon layer(d-SnO_(2)@C)are developed by hydrothermal deposition coupled with annealing process,as promising catalysts for ambient electrocatalytic N_(2)reduction.d-SnO_(2)@C exhibits high activity and excellent selectivity for electrocatalytic conversion of N_(2)to NH_(3)in acidic electrolytes,with Faradic efficiency as high as 12.7%at-0.15 V versus the reversible hydrogen electrode(RHE)and large NH_(3)yield rate of 16.68μg h^(-1)mgcat^(-1)at-0.25 V vs.RHE in 0.1 mol L^(-1)HCl.Benefiting from the structural superiority of enhanced charge transfer efficiency and optimized surface states,d-SnO_(2)@C also achieves excellent long-term stability.展开更多
1 Results LiNi0.8Co0.1+xMn0.1-xO2 cathodes with x=0,0.03 and 0.06 were prepared by firing a mixture of stoichiometric amounts of LiOH·H2O and coprecipitated Ni0.8Co0.1+xMn0.1-x(OH)2 at 800 ℃ for 15 h.Using these...1 Results LiNi0.8Co0.1+xMn0.1-xO2 cathodes with x=0,0.03 and 0.06 were prepared by firing a mixture of stoichiometric amounts of LiOH·H2O and coprecipitated Ni0.8Co0.1+xMn0.1-x(OH)2 at 800 ℃ for 15 h.Using these powders,their storage characteristics upon exposure to air and electrolytes at 90 ℃ were compared before charging and after charging to 4.3 V with a variation of the storage time.As the Co content (x) increased in the cathode,both the Ni2+ content in the lithium 3a sites,and the contents of the ...展开更多
1 Results For electrode materials in lithium batteries,a high surface area can provide higher electrode/electrolyte contact areas,thus eventually causing the shorter diffusion paths with the particles,and provides mor...1 Results For electrode materials in lithium batteries,a high surface area can provide higher electrode/electrolyte contact areas,thus eventually causing the shorter diffusion paths with the particles,and provides more facile intercalation for Li ions[1-4].In addition,reduced strain of intercalation and contributions from charge storage at the surface may also contribute to Li capacity,compared with bulk counterparts.In this regard,I am going to talk about the preparation and electrochemical properties o...展开更多
1 Results Recently,Ryoo's group reported the preparation of ordered mesoporous carbon using highly ordered mesoporous silica[1-2]. Mesoporous and nanowire SnO2 anode materials for lithium batteries were prepared u...1 Results Recently,Ryoo's group reported the preparation of ordered mesoporous carbon using highly ordered mesoporous silica[1-2]. Mesoporous and nanowire SnO2 anode materials for lithium batteries were prepared using KIT-6 and SBA-15 SiO2 templates. The as-prepared SnO2 nanowires had a diameter of 6 nm and a length of ≈3 μm and Brunauer-Emmett-Teller (BET) surface area of 80 m2/g while mesoporous SnO2 showed a pore size of 3.8 nm and a BET surface area of 160 m2/g. The charge capacities of these two an...展开更多
基金supported by Taishan Scholar Program of Shandong Province,China(ts201712045)the Doctoral Found of QUST(0100229001)2019 Research Funds(1.190002.01)of Ulsan National Institute of Science and Technology(UNIST)。
文摘For high-efficiency NH_(3)synthesis via ambient-condition electrohydrogenation of inert N_(2),it is pivotal to ingeniously design an active electrocatalyst with multiple features of abundant surfacial deficiency,good conductivity and large surface area.Here,oxygen-deficient SnO_(2)nanoparticles encapsulated by ultrathin carbon layer(d-SnO_(2)@C)are developed by hydrothermal deposition coupled with annealing process,as promising catalysts for ambient electrocatalytic N_(2)reduction.d-SnO_(2)@C exhibits high activity and excellent selectivity for electrocatalytic conversion of N_(2)to NH_(3)in acidic electrolytes,with Faradic efficiency as high as 12.7%at-0.15 V versus the reversible hydrogen electrode(RHE)and large NH_(3)yield rate of 16.68μg h^(-1)mgcat^(-1)at-0.25 V vs.RHE in 0.1 mol L^(-1)HCl.Benefiting from the structural superiority of enhanced charge transfer efficiency and optimized surface states,d-SnO_(2)@C also achieves excellent long-term stability.
基金Taishan Scholar Program of Shandong Province,China(ts201712045)Shandong Provincial Key Research and Development Program(2019GGX102069)+2 种基金the Natural Science Foundation of Shandong Province of China(ZR2018BB008)Doctoral Found of Qingdao University of Science and Technology(0100229001 and 010029081)2019 Research Funds of Ulsan National Institute of Science and Technology,South Korea(1.190002.01).
文摘单原子与基底之间的电子耦合在提升单原子催化剂的本征催化活性方面起到至关重要的作用.本文通过一步水热法在温和条件下制备了单原子Ru修饰的三维多级Co(OH)F纳米片阵列催化剂.该催化剂在1 mol L^(−1)KOH电解液中展现出高的电催化析氧反应活性和稳定性,在10和500 mA cm^(−2)的电流密度下分别表现出200和326 mV的过电位.通过对催化剂析氧反应前后的电子结构和表面化学态的研究发现,单原子Ru和Co(OH)F之间强烈的电子耦合诱导体系电荷重新分布,并抑制了Ru在高的OER电势下被过度氧化为过高的价态(大于+4价).本工作提供了一个通过羟基氟化钴稳定单原子Ru,以提高大电流下析氧反应的活性和稳定性的策略.
文摘1 Results LiNi0.8Co0.1+xMn0.1-xO2 cathodes with x=0,0.03 and 0.06 were prepared by firing a mixture of stoichiometric amounts of LiOH·H2O and coprecipitated Ni0.8Co0.1+xMn0.1-x(OH)2 at 800 ℃ for 15 h.Using these powders,their storage characteristics upon exposure to air and electrolytes at 90 ℃ were compared before charging and after charging to 4.3 V with a variation of the storage time.As the Co content (x) increased in the cathode,both the Ni2+ content in the lithium 3a sites,and the contents of the ...
文摘1 Results For electrode materials in lithium batteries,a high surface area can provide higher electrode/electrolyte contact areas,thus eventually causing the shorter diffusion paths with the particles,and provides more facile intercalation for Li ions[1-4].In addition,reduced strain of intercalation and contributions from charge storage at the surface may also contribute to Li capacity,compared with bulk counterparts.In this regard,I am going to talk about the preparation and electrochemical properties o...
文摘1 Results Recently,Ryoo's group reported the preparation of ordered mesoporous carbon using highly ordered mesoporous silica[1-2]. Mesoporous and nanowire SnO2 anode materials for lithium batteries were prepared using KIT-6 and SBA-15 SiO2 templates. The as-prepared SnO2 nanowires had a diameter of 6 nm and a length of ≈3 μm and Brunauer-Emmett-Teller (BET) surface area of 80 m2/g while mesoporous SnO2 showed a pore size of 3.8 nm and a BET surface area of 160 m2/g. The charge capacities of these two an...
