Hengyuan LiuXingjiang WuYuhao GengXin Li...
544-555页查看更多>>摘要：Electrocatalytic nitrogen reduction reaction(NRR)is considered as a promising candidate to achieve ammonia synthesis because of clean electric energy,moderate reaction condition,safe operating process and harmless by-products.However,the chemical inertness of nitrogen and poor activated capacity on catalyst surface usually produce low ammonia yield and faradic efficiency.Herein,the microfluidic technology is proposed to efficiently fabricate enriched iridium nanodots/carbon architecture.Owing to in-situ co-precipitation reaction and micro fluidic manipulation,the iridium nanodots/carbon nanomaterials possess small average size,uniform dispersion,high conductivity and abundant active sites,producing good proton activation and rapid electrons transmission and moderate adsorption/desorption capacity.As a result,the as-pre-pared iridium nanodots/carbon nanomaterials realize large ammonia yield of 28.73 μg h-1 cm-2 and faradic efficiency of 9.14％in KOH solution.Moreover,the high ammonia yield of 11.21 μg h-1 cm-2 and faradic efficiency of 24.30％are also achieved in H2SO4 solution.The microfluidic method provides a reference for large-scale fabrication of nano-sized catalyst materials,which may accelerate the progress of electrocatalytic NRR in industrialization field.
Qiang HanLele CaiZhaofeng YangYanjie Hu...
556-564页查看更多>>摘要：Developing single-crystalline Ni-rich cathodes is an effective strategy to improve the safety and cycle life of Li-ion batteries(LIBs).However,the easy-to-loss of Li and O in high-temperature lithiation results in unsatisfactory ordered layered structure and stoichiometry.Herein,we demonstrate the synthesis of highly-ordered and fully-stoichiometric single-crystalline LiNi0.83Co0.12Mn0.05O2(SC-NCM83)cathodes by the regulation of pre-lithiation kinetics.The well-balanced pre-lithiation kinetics have been proved to greatly improve the proportion of layered phase in the intermediate by inhibiting the formation of metastable spinel phase,which promoted the rapid transformation of the intermediate into highly-ordered layered SC-NCM83 in the subsequent lithiation process.After coating a layer of Li2O-B2O3,the resultant cathodes deliver superior cycling stability with 90.9％capacity retention at 1C after 300 cycles in pouch-type full batteries.The enhancement mechanism has also been clarified.These findings exhibit fundamental insights into the pre-lithiation kinetics process for guiding the synthesis of high-quality single-crystalline Ni-rich cathodes.
Huarong FanYubing SiYiming ZhangFulong Zhu...
565-572页查看更多>>摘要：Lithium-sulfur batteries(LSBs)with high energy densities have been demonstrated the potential for energy-intensive demand applications.However,their commercial applicability is hampered by hysteretic electrode reaction kinetics and the shuttle effect of lithium polysulfides(LiPSs).In this work,an interlayer consisting of high-entropy metal oxide(Cu0.7Fe0.6Mn0.4Ni0.6Sn0.5)O4 grown on carbon nanofibers(HEO/CNFs)is designed for LSBs.The CNFs with highly porous networks provide transport pathways for Li+and e,as well as a physical sieve effect to limit LiPSs crossover.In particular,the grapevine-like HEO nanoparticles generate metal-sulfur bonds with LiPSs,efficiently anchoring active materials.The unique structure and function of the interlayer enable the LSBs with superior electrochemical performance,i.e.,the high specific capacity of 1381 mAh g-1 at 0.1 C and 561 mAh g at 6 C.This work presents a facile strategy for exploiting high-performance LSBs.
Shani LiYanan XuWenhao LiuXudong Zhang...
573-583页查看更多>>摘要：Lithium-ion capacitors(LICs)combining the advantages of lithium-ion batteries and supercapacitors are considered a promising next-generation energy storage device.However,the sluggish kinetics of battery-type anode cannot match the capacitor-type cathode,restricting the development of LICs.Herein,hierarchical carbon framework(HCF)anode material composed of 0D carbon nanocage bridged with 2D graphene network are developed via a template-confined synthesis process.The HCF with nanocage structure reduces the Li+transport path and benefits the rapid Li+migration,while 2D graphene network can promote the electron interconnecting of carbon nanocages.In addition,the doped N atoms in HCF facilitate to the adsorption of ions and enhance the pseudo contribution,thus accelerate the kinetics of the anode.The HCF anode delivers high specific capacity,remarkable rate capability.The LIC pouch-cell based on HCF anode and active HCF(a-HCF)cathode can provide a high energy density of 162 Wh kg-1 and a superior power density of 15.8 kW kg-1,as well as a long cycling life exceeding 15,000 cycles.This study demonstrates that the well-defined design of hierarchical carbon framework by incorporating 0D carbon nanocages and 2D graphene network is an effective strategy to promote LIC anode kinetics and hence boost the LIC electrochemical performance.
Manman XuShiqi FuYukai WenWei Li...
584-595页查看更多>>摘要：Dwindling energy sources and a worsening environment are huge global problems,and biomass wastes are an under-exploited source of material for both energy and material generation.Herein,self-template decoction dregs of Ganoderma lucidum-derived porous carbon nanotubes(ST-DDLGCs)were synthesized via a facile and scalable strategy in response to these challenges.ST-DDLGCs exhibited a large surface area(1731.51 m2 g-1)and high pore volume(0.76 cm3 g-1),due to the interlacing tubular structures of precursors and extra-hierarchical porous structures on tube walls.In the ST-DDLGC/PMS system,the degradation efficiency of capecitabine(CAP)reached～97.3％within 120 min.Moreover,ST-DDLGCs displayed high catalytic activity over a wide pH range of 3-9,and strong anti-interference to these typical and ubiq-uitous anions in wastewater and natural water bodies(i.e.,H2PO4-,NO3-,Cl-and HCO3-),in which a 1O2-dominated oxidation was identified and non-radical mechanisms were deduced.Additionally,ST-DDLGC-based coin-type symmetrical supercapacitors exhibited outstanding electrochemical performance,with specific capacitances of up to 328.1 F g-1 at 0.5 A g-1,and cycling stability of up to 98.6％after 10,000 cycles at a current density of 2 A g-1.The superior properties of ST-DDLGCs could be attributed to the unique porous tubular structure,which facilitated mass transfer and presented numerous active sites.The results highlight ST-DDLGCs as a potential candidate for constructing inexpensive and advanced environmentally functional materials and energy storage devices.
NETL
NSTL
万方数据