Tin phosphide(Sn_(x)P_(y))is an anode for sodium-ion batteries resulting from its exceptionally high theoretical capacity in future.Nevertheless,its application will be hindered by significant volume expansion during ...Tin phosphide(Sn_(x)P_(y))is an anode for sodium-ion batteries resulting from its exceptionally high theoretical capacity in future.Nevertheless,its application will be hindered by significant volume expansion during charge discharge cycles and poor electrical conductivity.This study employs a Sn-based metal-organic framework(Sn-MOF)as a precursor for synthesizing tin phosphide nanoparticles.Then Solidago Canadensis L.,commonly known as Canadian Goldenrod,is utilized as a biomass carbon carrier to form a composite with tin phosphide nanoparticles.The biomass derived porous carbon provides additional sodium ion storage sites and serves as a structural scaffold that constrains the volumetric expansion of tin phosphide,thereby enhancing the material’s stability.The fabricated composite exhibits superior electrode electrochemical performance for sodium-ion batteries.It retains a high capacity(489.5 mA·h/g)after 100 cycles at 0.2 A/g.Even after 500 cycles at a high current density of 2 A/g,it still maintains a stable reversible capacity.This study offers a comprehensive exploration of innovative design strategies essential for the development of novel anode materials,paving the way for more sustainable and efficient sodium-ion-based energy storage systems.展开更多
Dynamic performance is important to the controlling and monitoring of the organic Rankine cycle(ORC) system so to avoid the occurrence of unwanted conditions. A small scale waste heat recovery system with organic Rank...Dynamic performance is important to the controlling and monitoring of the organic Rankine cycle(ORC) system so to avoid the occurrence of unwanted conditions. A small scale waste heat recovery system with organic Rankine cycle was constructed and the dynamic behavior was presented. In the dynamic test, the pump was stopped and then started. In addition, there was a step change of the flue gas volume flow rate and the converter frequency of multistage pump, respectively. The results indicate that the working fluid flow rate has the shortest response time, followed by the expander inlet pressure and the expander inlet temperature.The operation frequency of pump is a key parameter for the ORC system. Due to a step change of pump frequency(39.49-35.24 Hz),the expander efficiency and thermal efficiency drop by 16% and 21% within 2 min, respectively. Besides, the saturated mixture can lead to an increase of the expander rotation speed.展开更多
文摘Tin phosphide(Sn_(x)P_(y))is an anode for sodium-ion batteries resulting from its exceptionally high theoretical capacity in future.Nevertheless,its application will be hindered by significant volume expansion during charge discharge cycles and poor electrical conductivity.This study employs a Sn-based metal-organic framework(Sn-MOF)as a precursor for synthesizing tin phosphide nanoparticles.Then Solidago Canadensis L.,commonly known as Canadian Goldenrod,is utilized as a biomass carbon carrier to form a composite with tin phosphide nanoparticles.The biomass derived porous carbon provides additional sodium ion storage sites and serves as a structural scaffold that constrains the volumetric expansion of tin phosphide,thereby enhancing the material’s stability.The fabricated composite exhibits superior electrode electrochemical performance for sodium-ion batteries.It retains a high capacity(489.5 mA·h/g)after 100 cycles at 0.2 A/g.Even after 500 cycles at a high current density of 2 A/g,it still maintains a stable reversible capacity.This study offers a comprehensive exploration of innovative design strategies essential for the development of novel anode materials,paving the way for more sustainable and efficient sodium-ion-based energy storage systems.
基金Project(2009Gk2009)supported by the Science and Technology Department Funds of Hunan Province,ChinaProject(12C0379)supported by the Scientific Research Fund of Hunan Province,ChinaProject(13QDZ04)supported by the Scientific Research Foundation for Doctors of Xiang Tan University,China
文摘Dynamic performance is important to the controlling and monitoring of the organic Rankine cycle(ORC) system so to avoid the occurrence of unwanted conditions. A small scale waste heat recovery system with organic Rankine cycle was constructed and the dynamic behavior was presented. In the dynamic test, the pump was stopped and then started. In addition, there was a step change of the flue gas volume flow rate and the converter frequency of multistage pump, respectively. The results indicate that the working fluid flow rate has the shortest response time, followed by the expander inlet pressure and the expander inlet temperature.The operation frequency of pump is a key parameter for the ORC system. Due to a step change of pump frequency(39.49-35.24 Hz),the expander efficiency and thermal efficiency drop by 16% and 21% within 2 min, respectively. Besides, the saturated mixture can lead to an increase of the expander rotation speed.
