In this study, hierarchical copper nano-dendrites （CuNDs） are fabricated via the electrodeposition method. The electrochemical behaviors of the as-obtained hierarchical CuNDs in 0.1 M NaOH aqueous solution are subse...In this study, hierarchical copper nano-dendrites （CuNDs） are fabricated via the electrodeposition method. The electrochemical behaviors of the as-obtained hierarchical CuNDs in 0.1 M NaOH aqueous solution are subsequently studied. The CuNDs experience a non-equilibritrm oxidation process when subjected to cyclic voltammetry （CV） measurements. The first oxidation peak O1 in CV is attributed to the formation of an epitaxial Cu20 layer over the surface of the hierarchical CuNDs. However, the second oxidation peak 02 in CV appears unusually broad across a wide potential range. In this region, the reaction process starts with the nucleation and growth of Cu（OH）2 nanoneedles, followed by the oxidation of Cu20. Upon the increase of potential Cu20 is gradually transformed to CuO and Cu（OH）2, forming a dual-layer structure with high productivity of Cu（OH）2 nanoneedles.展开更多
使用化工流程模拟软件Aspen Plus V10.0,根据现场采集数据建立模拟流程,对DMF-甲醇-碱性水溶液体系的分离进行模拟计算。模拟数据与现场数据基本吻合,证明所用NRTL热力学模型的可靠性,并在此基础上提出改进分离方案。改进后的分离方案...使用化工流程模拟软件Aspen Plus V10.0,根据现场采集数据建立模拟流程,对DMF-甲醇-碱性水溶液体系的分离进行模拟计算。模拟数据与现场数据基本吻合,证明所用NRTL热力学模型的可靠性,并在此基础上提出改进分离方案。改进后的分离方案减少了DMF在水中的停留时间,降低了DMF分解概率,提高了DMF产品收率和质量,同时减少了废气排放,降低了废水COD。此外,改进的分离方案在精制塔和甲醇塔之间使用热集成,加热蒸汽消耗比传统方案降低约17.1%。展开更多
制备了 L a1 - x Cex(Ni Co Mn Al) 5 贮氢合金电极 ,研究高温热碱充电和 KBH4还原剂热充电两种新型表面改性方法及其对 L a1 - x Cex(Ni Co Mn Al) 5 贮氢合金电极活化次数、高倍率充放电能力和氢扩散行为的影响。探讨了作用机理。结...制备了 L a1 - x Cex(Ni Co Mn Al) 5 贮氢合金电极 ,研究高温热碱充电和 KBH4还原剂热充电两种新型表面改性方法及其对 L a1 - x Cex(Ni Co Mn Al) 5 贮氢合金电极活化次数、高倍率充放电能力和氢扩散行为的影响。探讨了作用机理。结果发现表面处理法有利于提高合金电极的活化性能和大电流充放电性能。其中 KBH4还原剂热充电法处理后的合金电极在第二次充放电循环时就能完全活化 ;并且在90 0 m A/g的充放电电流密度下 ,其高倍率放电能力达到85 %左右 ;合金电极表面出现大量的微裂纹 ,氢在处理后的合金电极中的扩散系数为 3.2 3× 10 - 9cm2展开更多
The La 1- x Ce x (NiCoMnAl) 5 alloy electrodes were treated by hot charging in alkaline aqueous solution containing KBH 4. The activation behavior, hydrogen diffusion coefficient and maximum discharging capacity, high...The La 1- x Ce x (NiCoMnAl) 5 alloy electrodes were treated by hot charging in alkaline aqueous solution containing KBH 4. The activation behavior, hydrogen diffusion coefficient and maximum discharging capacity, high rate discharging capability of alloy electrodes were tested. The surface morphology and element content were observed by scanning electron microscope. The results show that the alloy electrode is fully activated after the second charging discharging cycle and has a high rate discharging capability of 85% at 900 mA/g. The surface has a lot of micro cracks and hydrogen diffusion coefficient is about (2～3)×10 -9 cm 2/s . Therefore, this method can markedly improve activation behavior and high rate charging capacity of the alloy electrode. The mechanism of this surface modification of the alloy electrode is also discussed. [展开更多
文摘In this study, hierarchical copper nano-dendrites （CuNDs） are fabricated via the electrodeposition method. The electrochemical behaviors of the as-obtained hierarchical CuNDs in 0.1 M NaOH aqueous solution are subsequently studied. The CuNDs experience a non-equilibritrm oxidation process when subjected to cyclic voltammetry （CV） measurements. The first oxidation peak O1 in CV is attributed to the formation of an epitaxial Cu20 layer over the surface of the hierarchical CuNDs. However, the second oxidation peak 02 in CV appears unusually broad across a wide potential range. In this region, the reaction process starts with the nucleation and growth of Cu（OH）2 nanoneedles, followed by the oxidation of Cu20. Upon the increase of potential Cu20 is gradually transformed to CuO and Cu（OH）2, forming a dual-layer structure with high productivity of Cu（OH）2 nanoneedles.
文摘使用化工流程模拟软件Aspen Plus V10.0,根据现场采集数据建立模拟流程,对DMF-甲醇-碱性水溶液体系的分离进行模拟计算。模拟数据与现场数据基本吻合,证明所用NRTL热力学模型的可靠性,并在此基础上提出改进分离方案。改进后的分离方案减少了DMF在水中的停留时间,降低了DMF分解概率,提高了DMF产品收率和质量,同时减少了废气排放,降低了废水COD。此外,改进的分离方案在精制塔和甲醇塔之间使用热集成,加热蒸汽消耗比传统方案降低约17.1%。
文摘The La 1- x Ce x (NiCoMnAl) 5 alloy electrodes were treated by hot charging in alkaline aqueous solution containing KBH 4. The activation behavior, hydrogen diffusion coefficient and maximum discharging capacity, high rate discharging capability of alloy electrodes were tested. The surface morphology and element content were observed by scanning electron microscope. The results show that the alloy electrode is fully activated after the second charging discharging cycle and has a high rate discharging capability of 85% at 900 mA/g. The surface has a lot of micro cracks and hydrogen diffusion coefficient is about (2～3)×10 -9 cm 2/s . Therefore, this method can markedly improve activation behavior and high rate charging capacity of the alloy electrode. The mechanism of this surface modification of the alloy electrode is also discussed. [
