The dissolution equilibrium of calcium vapor in liquid iron was carried out at 1873 K in a two-temperature zone furnace by using vapor pressure method.A sealed Mo reaction chamber and a self-made CaO crucible were use...The dissolution equilibrium of calcium vapor in liquid iron was carried out at 1873 K in a two-temperature zone furnace by using vapor pressure method.A sealed Mo reaction chamber and a self-made CaO crucible were used in this experiment.The thermodynamic parameters obtained are as follows for reaction Ca(g) =[Ca]\nK = 4.27-15040/T△G^0 = 125000-35.5T J/mol The relation between dissolved amount of calcium in liquid iron(1873K) and calcium vapor pressure is expressed as[%Ca]= 0.028 pc.展开更多
The dissolution equilibrium of magnesium vapour in liguid Fe has been studied in a two-tem- perature-zone furnace at 1600℃ by use of the vapour pressure method.The equilibrium con- stant for the reaction Mg_((g))=[Mg...The dissolution equilibrium of magnesium vapour in liguid Fe has been studied in a two-tem- perature-zone furnace at 1600℃ by use of the vapour pressure method.The equilibrium con- stant for the reaction Mg_((g))=[Mg]and the free energy of solution obtained are: K=a_(Mg)/P_(Mg)=0.0236 ΔG°(wt-%)=58300 J/mol展开更多
The dissolution equilibrium of magnesium vapour in liguid Fe has been studied in a two-tem- perature-zone furnace at 1600℃ by use of the vapour pressure method.The equilibrium con- stant for the reaction Mg_(g)=[Mg] ...The dissolution equilibrium of magnesium vapour in liguid Fe has been studied in a two-tem- perature-zone furnace at 1600℃ by use of the vapour pressure method.The equilibrium con- stant for the reaction Mg_(g)=[Mg] and the free energy of solution obtained are: K=a_(Mg)/P_(Mg)=0.0236 △G°(wt-%)=58300 J/mol展开更多
In the pursuit of advancing electrocatalysts for the alkaline oxygen evolution reaction(OER),the development of nickel-based metal-organic frameworks(MOFs)with a judicious balance of cost-effectiveness and catalytic e...In the pursuit of advancing electrocatalysts for the alkaline oxygen evolution reaction(OER),the development of nickel-based metal-organic frameworks(MOFs)with a judicious balance of cost-effectiveness and catalytic efficacy is of paramount importance.Herein,we have achieved a commendable feat in the synthesis of Ni MOFs integrated with uniformly dispersed Fe and S species on a FeS substrate based on the precipitation-dissolution equilibrium.For the obtained Ni MOFs/FeS/IF catalyst,three factors including excellent conductivity of FeS substrate,conjugated carboxylate ligands and spindle-shaped structure with uniformly dispersed Fe and S can contribute to the enhanced activity for OER.The electrochemical measurements show that Ni MOFs/FeS/IF requires overpotentials of 250 and 280 mV to reach current densities of 100 mA cm^(-2) in 1 M KOH and 1 M KOH seawater,respectively,as compared to that(427@100 mA cm^(-2) in 1 M KOH,455@100 mA cm^(-2) in 1 M KOH seawater)of Ni MOFs/NF.Interestingly,the Ni MOFs/FeS/IF electrode displayed remarkable electrochemical stability with a high current density of 500 mA cm^(-2) after testing for 50 h,which is attributed to the synergistic effect of the bimetallic centers and optimized coordination environments via Ni-S bonds.The study reveals the potential for efficiently driving freshwater and seawater splitting by uniformly distributing anions and cations based on the precipitation-dissolution equilibrium during the in situ generation of metal-organic frameworks toward advanced electrocatalysts.展开更多
Experiments were carried out at 1873 K in a double-temperature zone furnace using vapor pressure method. The equilibriumtests of bedum vapor with liquid iron were conducted in CaO crucibles sealed in a Mo chamber. As ...Experiments were carried out at 1873 K in a double-temperature zone furnace using vapor pressure method. The equilibriumtests of bedum vapor with liquid iron were conducted in CaO crucibles sealed in a Mo chamber. As a result, the experiments obtainedthe relation between the dissolved content of Ba in liquid iron and the vapor pressure of Ba and the standard Gibbs energies for the re-actions Ba(g)=[Ba] and Ba(l)=[Ba].展开更多
文摘The dissolution equilibrium of calcium vapor in liquid iron was carried out at 1873 K in a two-temperature zone furnace by using vapor pressure method.A sealed Mo reaction chamber and a self-made CaO crucible were used in this experiment.The thermodynamic parameters obtained are as follows for reaction Ca(g) =[Ca]\nK = 4.27-15040/T△G^0 = 125000-35.5T J/mol The relation between dissolved amount of calcium in liquid iron(1873K) and calcium vapor pressure is expressed as[%Ca]= 0.028 pc.
文摘The dissolution equilibrium of magnesium vapour in liguid Fe has been studied in a two-tem- perature-zone furnace at 1600℃ by use of the vapour pressure method.The equilibrium con- stant for the reaction Mg_((g))=[Mg]and the free energy of solution obtained are: K=a_(Mg)/P_(Mg)=0.0236 ΔG°(wt-%)=58300 J/mol
文摘The dissolution equilibrium of magnesium vapour in liguid Fe has been studied in a two-tem- perature-zone furnace at 1600℃ by use of the vapour pressure method.The equilibrium con- stant for the reaction Mg_(g)=[Mg] and the free energy of solution obtained are: K=a_(Mg)/P_(Mg)=0.0236 △G°(wt-%)=58300 J/mol
基金financially supported by National Natural Science Foundation of China(52174283 and 52274308).
文摘In the pursuit of advancing electrocatalysts for the alkaline oxygen evolution reaction(OER),the development of nickel-based metal-organic frameworks(MOFs)with a judicious balance of cost-effectiveness and catalytic efficacy is of paramount importance.Herein,we have achieved a commendable feat in the synthesis of Ni MOFs integrated with uniformly dispersed Fe and S species on a FeS substrate based on the precipitation-dissolution equilibrium.For the obtained Ni MOFs/FeS/IF catalyst,three factors including excellent conductivity of FeS substrate,conjugated carboxylate ligands and spindle-shaped structure with uniformly dispersed Fe and S can contribute to the enhanced activity for OER.The electrochemical measurements show that Ni MOFs/FeS/IF requires overpotentials of 250 and 280 mV to reach current densities of 100 mA cm^(-2) in 1 M KOH and 1 M KOH seawater,respectively,as compared to that(427@100 mA cm^(-2) in 1 M KOH,455@100 mA cm^(-2) in 1 M KOH seawater)of Ni MOFs/NF.Interestingly,the Ni MOFs/FeS/IF electrode displayed remarkable electrochemical stability with a high current density of 500 mA cm^(-2) after testing for 50 h,which is attributed to the synergistic effect of the bimetallic centers and optimized coordination environments via Ni-S bonds.The study reveals the potential for efficiently driving freshwater and seawater splitting by uniformly distributing anions and cations based on the precipitation-dissolution equilibrium during the in situ generation of metal-organic frameworks toward advanced electrocatalysts.
文摘Experiments were carried out at 1873 K in a double-temperature zone furnace using vapor pressure method. The equilibriumtests of bedum vapor with liquid iron were conducted in CaO crucibles sealed in a Mo chamber. As a result, the experiments obtainedthe relation between the dissolved content of Ba in liquid iron and the vapor pressure of Ba and the standard Gibbs energies for the re-actions Ba(g)=[Ba] and Ba(l)=[Ba].
