Steady State Tokamak （SST-1） vacuum vessel baking as well as baking of the first wall components of SST-1 are essential to plasma physics experiments. Under a refurbishment spectrum of SST-1, the nitrogen gas heatin...Steady State Tokamak （SST-1） vacuum vessel baking as well as baking of the first wall components of SST-1 are essential to plasma physics experiments. Under a refurbishment spectrum of SST-1, the nitrogen gas heating and supply system has been fully refurbished. The SST-1 vacuum vessel consists of ultra-high vacuum （UHV） compatible eight modules and eight sectors. Rectangular baking channels are embedded on each of them. Similarly, the SST-1 plasma facing components （PFC） are comprised of modular graphite diverters and movable graphite based limiters. The nitrogen gas heating and supply system would bake the plasma facing components at 350 ~C and the SST-1 vacuum vessel at 150 ~C over an extended duration so as to remove water vapour and other absorbed gases. An efficient PLC based baking facility has been developed and implemented for monitoring and control purposes. This paper presents functional and operational aspects of a SST-1 nitrogen gas heating and supply system. Some of the experimental results obtained during the baking of SST-1 vacuum modules and sectors are also presented here.展开更多
2The main existing issues in graphitic carbon nitride(g-C_(3)N_(4))based photocatalytic hydrogen(H_(2))production include poor separation and transfer of photogenerated charge carriers and low optical absorption.Thus,...2The main existing issues in graphitic carbon nitride(g-C_(3)N_(4))based photocatalytic hydrogen(H_(2))production include poor separation and transfer of photogenerated charge carriers and low optical absorption.Thus,the construction of a multicomponent co-catalyst and its integration with g-C_(3)N_(4)to facilitate the transport and separation of photoexcited charge carriers are regarded as a promising approach for augmenting the photocatalytic H_(2)production activity.In this study,we report CoZnS@NSC-X/g-C_(3)N_(4)(where X indicates sulfidation times of 15,30,45,and 60 min)nanocomposites constructed from a CoZn-MOF derived CoS_(2),Co_(3)S_(4) and ZnS intercalated nitrogen/sulfur-doped carbon(CoZnS@NSC)nanoparticle co-catalyst and g-C_(3)N_(4)for H_(2)production from water splitting.The maximum photocatalytic H_(2)evolution rate(610.8μmol h^(−1)g^(−1))of the CoZnS@NSC-15/g-C_(3)N_(4)heterostructure,with an optimized CoZnS@NSC loading of 10 wt%and 15 min sulfidation,is nearly 3.7 and 290.9 times higher than those of unsulfidated CoZn@NC/g-C_(3)N_(4)and bare g-C_(3)N_(4),respectively.This significantly boosted photocatalytic performance is attributed to the efficient separation and transfer of electron-hole(e^(-)/h^(+))pairs and electronic conductivity caused by the appropriate sulfidation time and loading amount of CoZnS@NSC nanoparticles.This work offers a facile approach to designing metal-organic framework derived co-catalyst modified semiconductor-based photocatalysts for high-performance in practical applications.展开更多
文摘Steady State Tokamak （SST-1） vacuum vessel baking as well as baking of the first wall components of SST-1 are essential to plasma physics experiments. Under a refurbishment spectrum of SST-1, the nitrogen gas heating and supply system has been fully refurbished. The SST-1 vacuum vessel consists of ultra-high vacuum （UHV） compatible eight modules and eight sectors. Rectangular baking channels are embedded on each of them. Similarly, the SST-1 plasma facing components （PFC） are comprised of modular graphite diverters and movable graphite based limiters. The nitrogen gas heating and supply system would bake the plasma facing components at 350 ~C and the SST-1 vacuum vessel at 150 ~C over an extended duration so as to remove water vapour and other absorbed gases. An efficient PLC based baking facility has been developed and implemented for monitoring and control purposes. This paper presents functional and operational aspects of a SST-1 nitrogen gas heating and supply system. Some of the experimental results obtained during the baking of SST-1 vacuum modules and sectors are also presented here.
基金special funding support from the National Natural Science Foundation of China(22271266)the USTC-Yanchang Petroleum New Energy Joint Research Project(2022ZKD-02)the Fundamental Research Funds for the Central Universities(YD2340002001).
文摘2The main existing issues in graphitic carbon nitride(g-C_(3)N_(4))based photocatalytic hydrogen(H_(2))production include poor separation and transfer of photogenerated charge carriers and low optical absorption.Thus,the construction of a multicomponent co-catalyst and its integration with g-C_(3)N_(4)to facilitate the transport and separation of photoexcited charge carriers are regarded as a promising approach for augmenting the photocatalytic H_(2)production activity.In this study,we report CoZnS@NSC-X/g-C_(3)N_(4)(where X indicates sulfidation times of 15,30,45,and 60 min)nanocomposites constructed from a CoZn-MOF derived CoS_(2),Co_(3)S_(4) and ZnS intercalated nitrogen/sulfur-doped carbon(CoZnS@NSC)nanoparticle co-catalyst and g-C_(3)N_(4)for H_(2)production from water splitting.The maximum photocatalytic H_(2)evolution rate(610.8μmol h^(−1)g^(−1))of the CoZnS@NSC-15/g-C_(3)N_(4)heterostructure,with an optimized CoZnS@NSC loading of 10 wt%and 15 min sulfidation,is nearly 3.7 and 290.9 times higher than those of unsulfidated CoZn@NC/g-C_(3)N_(4)and bare g-C_(3)N_(4),respectively.This significantly boosted photocatalytic performance is attributed to the efficient separation and transfer of electron-hole(e^(-)/h^(+))pairs and electronic conductivity caused by the appropriate sulfidation time and loading amount of CoZnS@NSC nanoparticles.This work offers a facile approach to designing metal-organic framework derived co-catalyst modified semiconductor-based photocatalysts for high-performance in practical applications.
