Preparation of high purity ruthenium nitrosyl nitrate using spent Ru-Zn/ZrO_(2)catalyst was studied,including melting and leaching to obtain potassium ruthenate solution,reduction,dissolving,concentrating and drying t...Preparation of high purity ruthenium nitrosyl nitrate using spent Ru-Zn/ZrO_(2)catalyst was studied,including melting and leaching to obtain potassium ruthenate solution,reduction,dissolving,concentrating and drying to obtain ruthenium trichloride,nitrosation and hydrolysis to obtain ruthenium nitrosyl hydroxide,removing of K^(+)and Cl^(-),and neutralization with nitric acid.The effects of temperature,concentration,time and pH on the yield and purity of intermediates and final product were studied,and the optimum process conditions were obtained.The yield of ruthenium nitrosyl nitrate is 92%,the content of ruthenium in high purity product is 32.16%,and the content of Cl^(-)and K^(+)are much less than 0.005%.The reaction kinetics of ruthenium nitrosyl chloride to ruthenium nitrosyl hydroxide was studied.The reaction orders of Ru(NO)Cl_(3)at 40,55 and 70℃are 0.39,0.37 and 0.39,respectively,while those of KOH are 0.16,0.15 and 0.17,respectively.The activation energy is-2.33 k J/mol.展开更多
As a newly emerging excellent energy storage device,supercapacitors have been widely studied due to their unique advantages.Electrode material is one of the key components that determine the performance of a supercapa...As a newly emerging excellent energy storage device,supercapacitors have been widely studied due to their unique advantages.Electrode material is one of the key components that determine the performance of a supercapacitor.Among the various electrode materials of supercapacitors,RuO_(2) has attracted great attention in the scientific community due to its high theoretical energy storage capability and excellent stability.However,most RuO_(2) materials suffer the problem of low specific surface area,causing a much lower actual capacitance value compared to the theoretical performance of the material.In this work,a mulberry-like RuO_(2) electrode material with large specific surface area(159.4 m^(2)·g^(-1))was successfully synthesized by a facial hydrothermal method.The electrochemical characterization has shown that the RuO_(2) possesses a high specific capacitance of 400 F·g^(-1) at a current density of 0.2 A·g^(-1) and good capacitance retention rate of 84.7%after 6000 charge/discharge cycles under a current density of 10 A·g^(-1).The energy densities and power densities of the RuO_(2)-AC supercapacitor vary from25.0 to 11.7 Wh·kg^(-1) and 160 to 10,560 W·kg^(-1) at current density ranging from 0.2 to 10.0 A·g^(-1),respectively.展开更多
The chalcogenides of platinum-group metals(PGMs)have been known to be present in minerals and the intermediate products of refining.Over recent years,their applications in various fields,including catalysis,have been ...The chalcogenides of platinum-group metals(PGMs)have been known to be present in minerals and the intermediate products of refining.Over recent years,their applications in various fields,including catalysis,have been explored.Given that certain PGM chalcogenides behave as compound semiconductors,they can be used as materials for photodetectors.In this study,RuS_(2),featuring a bandgap suitable for near-infrared photodetectors,was prepared by forming Ru on a SiO_(2)/Si substrate via the atomic layer deposition method using[Ru(TMM)(CO)_(3)]as the precursor.Annealing was conducted at 800℃ for 1 h under H_(2)S flow.High-resolution transmission electron microscopy(HRTEM)and X-ray diffraction(XRD)analysis clearly confirmed that the as-deposited hexagonal close-packed(hcp)Ru transformed to cubic RuS_(2) after post-annealing.The surface morphologies,chemical states,and electrical and optical properties of RuS_(2) were investigated.The influence of the metallic Ru surface morphology prior to sulfurization on the reaction between Ru and H_(2)S was also discussed.To evaluate the potential of using RuS_(2) as a photodetector,a photodetector was fabricated by forming electrodes on RuS_(2) to measure its photocurrent under near-infrared light.Thus,RuS_(2) was proven to exhibit a short response time(59μs)and generate a photocurrent of 84 nA under near-infrared light at 940 nm.展开更多
Aqueous ruthenium was detected in real-time under ambient conditions using microwaveassisted laser-induced breakdown spectroscopy(MW-LIBS).A 10 mJ laser energy and 750 W microwave power were directed at an open liquid...Aqueous ruthenium was detected in real-time under ambient conditions using microwaveassisted laser-induced breakdown spectroscopy(MW-LIBS).A 10 mJ laser energy and 750 W microwave power were directed at an open liquid jet sample of ruthenium.It was observed that,for liquid flow,the coupling efficiency between the microwave and the laser-induced plasma was limited to 43%.The improvement in the ruthenium’s signal-to-noise ratio with MW-LIBS,with respect to LIBS,was 76-fold.Based on MW-LIBS,the limit of detection for aqueous ruthenium was determined to be 957±84 ppb.展开更多
基金Project(22178392)supported by the National Natural Science Foundation of China。
文摘Preparation of high purity ruthenium nitrosyl nitrate using spent Ru-Zn/ZrO_(2)catalyst was studied,including melting and leaching to obtain potassium ruthenate solution,reduction,dissolving,concentrating and drying to obtain ruthenium trichloride,nitrosation and hydrolysis to obtain ruthenium nitrosyl hydroxide,removing of K^(+)and Cl^(-),and neutralization with nitric acid.The effects of temperature,concentration,time and pH on the yield and purity of intermediates and final product were studied,and the optimum process conditions were obtained.The yield of ruthenium nitrosyl nitrate is 92%,the content of ruthenium in high purity product is 32.16%,and the content of Cl^(-)and K^(+)are much less than 0.005%.The reaction kinetics of ruthenium nitrosyl chloride to ruthenium nitrosyl hydroxide was studied.The reaction orders of Ru(NO)Cl_(3)at 40,55 and 70℃are 0.39,0.37 and 0.39,respectively,while those of KOH are 0.16,0.15 and 0.17,respectively.The activation energy is-2.33 k J/mol.
基金the Australian Research Council Discovery Project(No.DP190102252)Queensland University of Technology Strategic Research Support FundQUT PRA scholarship。
文摘As a newly emerging excellent energy storage device,supercapacitors have been widely studied due to their unique advantages.Electrode material is one of the key components that determine the performance of a supercapacitor.Among the various electrode materials of supercapacitors,RuO_(2) has attracted great attention in the scientific community due to its high theoretical energy storage capability and excellent stability.However,most RuO_(2) materials suffer the problem of low specific surface area,causing a much lower actual capacitance value compared to the theoretical performance of the material.In this work,a mulberry-like RuO_(2) electrode material with large specific surface area(159.4 m^(2)·g^(-1))was successfully synthesized by a facial hydrothermal method.The electrochemical characterization has shown that the RuO_(2) possesses a high specific capacitance of 400 F·g^(-1) at a current density of 0.2 A·g^(-1) and good capacitance retention rate of 84.7%after 6000 charge/discharge cycles under a current density of 10 A·g^(-1).The energy densities and power densities of the RuO_(2)-AC supercapacitor vary from25.0 to 11.7 Wh·kg^(-1) and 160 to 10,560 W·kg^(-1) at current density ranging from 0.2 to 10.0 A·g^(-1),respectively.
基金supported by TANAKA Kikinzoku Kogyo K.K.Also by the Basic Science Research Program through the National Research Foundation of Korea(NRF)funded by the Ministry of Education(No.NRF-2021R1I1A1A01057933)。
文摘The chalcogenides of platinum-group metals(PGMs)have been known to be present in minerals and the intermediate products of refining.Over recent years,their applications in various fields,including catalysis,have been explored.Given that certain PGM chalcogenides behave as compound semiconductors,they can be used as materials for photodetectors.In this study,RuS_(2),featuring a bandgap suitable for near-infrared photodetectors,was prepared by forming Ru on a SiO_(2)/Si substrate via the atomic layer deposition method using[Ru(TMM)(CO)_(3)]as the precursor.Annealing was conducted at 800℃ for 1 h under H_(2)S flow.High-resolution transmission electron microscopy(HRTEM)and X-ray diffraction(XRD)analysis clearly confirmed that the as-deposited hexagonal close-packed(hcp)Ru transformed to cubic RuS_(2) after post-annealing.The surface morphologies,chemical states,and electrical and optical properties of RuS_(2) were investigated.The influence of the metallic Ru surface morphology prior to sulfurization on the reaction between Ru and H_(2)S was also discussed.To evaluate the potential of using RuS_(2) as a photodetector,a photodetector was fabricated by forming electrodes on RuS_(2) to measure its photocurrent under near-infrared light.Thus,RuS_(2) was proven to exhibit a short response time(59μs)and generate a photocurrent of 84 nA under near-infrared light at 940 nm.
文摘Aqueous ruthenium was detected in real-time under ambient conditions using microwaveassisted laser-induced breakdown spectroscopy(MW-LIBS).A 10 mJ laser energy and 750 W microwave power were directed at an open liquid jet sample of ruthenium.It was observed that,for liquid flow,the coupling efficiency between the microwave and the laser-induced plasma was limited to 43%.The improvement in the ruthenium’s signal-to-noise ratio with MW-LIBS,with respect to LIBS,was 76-fold.Based on MW-LIBS,the limit of detection for aqueous ruthenium was determined to be 957±84 ppb.
