Tin/tin oxide materials are key electrocatalysts for selective conversion of CO;to formate/formic acid.Herein we report a tin oxide material with nitrogen doping by using ammonia treatment at elevated temperature. The...Tin/tin oxide materials are key electrocatalysts for selective conversion of CO;to formate/formic acid.Herein we report a tin oxide material with nitrogen doping by using ammonia treatment at elevated temperature. The N doped material demonstrated enhanced electrocatalytic CO;reduction activity, showing high Faradaic efficiency（90%） for formate at -0.65 V vs. RHE with partial current density of 4 mA/cm;.The catalysis was contributed to increased electron negativity of N atom compared to O atom. Additionally, the N-doped catalyst demonstrates sulfur tolerance with retained formate selectivity. The analysis after electrolysis shows that the catalyst structure partially converts to metallic Sn, and thus the combined Sn/N-SnO;is the key for the active CO;catalysis.展开更多
石油套管用钢(/%:0.26~0.29C,0.25~0.35Si,0.40~0.50Mn,≤0.009P,≤0.004S,0.95~1.05Cr,0.09~0.11V,0.02~0.04Al,0.015~0.020Ti,≤0.006 0N)的生产流程为铁水预处理-120 t BOF-吹氩-LF-喂CaSi线-RH-合金化-喂CaSi线-软吹氩-Φ220 mm圆...石油套管用钢(/%:0.26~0.29C,0.25~0.35Si,0.40~0.50Mn,≤0.009P,≤0.004S,0.95~1.05Cr,0.09~0.11V,0.02~0.04Al,0.015~0.020Ti,≤0.006 0N)的生产流程为铁水预处理-120 t BOF-吹氩-LF-喂CaSi线-RH-合金化-喂CaSi线-软吹氩-Φ220 mm圆坯连铸工艺。通过热力学分析得出钢中N含量超过50×10^(-6)以及工业试验得出生产的圆铸坯中的N含量为67×10^(-6)时,在铸坯中易形成2μm以上的TiN夹杂。通过控制BOF终点[N]≤30×10^(-6),LF终点[S]≤25×10^(-6),[O]≤25×10^(-6),[N]≤35×10^(-6),RH合金化后终点[N]≤35×10^(-6),[H]≤1.5×10^(-6),稳定喂CaSi线速度300~400 m/min,控制中间包[N]≤40×10^(-6),严格连铸保护浇铸工艺,则铸坯中的N含量≤50×10^(-6),钢中TiN夹杂数量显著下降,未发现大尺寸TiN夹杂物。展开更多
采用磁控溅射方法在不锈钢表面沉积Ti N薄膜,通过扫描电子显微镜、显微硬度计、CSPM5500扫描探针显微镜、X射线衍射仪、往复式摩擦磨损仪等分析测试手段,研究氮气流量对薄膜形貌、成分、结构、硬度、表面粗糙度、耐磨损等性能的影响.结...采用磁控溅射方法在不锈钢表面沉积Ti N薄膜,通过扫描电子显微镜、显微硬度计、CSPM5500扫描探针显微镜、X射线衍射仪、往复式摩擦磨损仪等分析测试手段,研究氮气流量对薄膜形貌、成分、结构、硬度、表面粗糙度、耐磨损等性能的影响.结果表明,随着氮气流量的增加,薄膜的显微硬度、膜厚都逐渐降低,膜基结合力逐渐增加,膜基结合力在16 m L/min时达到最大67.2 N;表面粗糙度和平均摩擦系数均在8 m L/min时最低.随着氮气流量增加,薄膜主要生长取向由(200)晶面转向(111)晶面生长;Ti N薄膜的颜色也随氮气流量增大而加深,8 m L/min和12 m L/min时为金黄色,4 m L/min和16 m L/min时颜色较差.展开更多
基金financially supported by Key Research Program of the Chinese Academy of Sciences (ZDRW-ZS-2016-3)the National Key Research and Development Program of China (2016YFB0600901)the Instrument Developing Project of the Chinese Academy of Sciences
文摘Tin/tin oxide materials are key electrocatalysts for selective conversion of CO;to formate/formic acid.Herein we report a tin oxide material with nitrogen doping by using ammonia treatment at elevated temperature. The N doped material demonstrated enhanced electrocatalytic CO;reduction activity, showing high Faradaic efficiency（90%） for formate at -0.65 V vs. RHE with partial current density of 4 mA/cm;.The catalysis was contributed to increased electron negativity of N atom compared to O atom. Additionally, the N-doped catalyst demonstrates sulfur tolerance with retained formate selectivity. The analysis after electrolysis shows that the catalyst structure partially converts to metallic Sn, and thus the combined Sn/N-SnO;is the key for the active CO;catalysis.
文摘采用磁控溅射方法在不锈钢表面沉积Ti N薄膜,通过扫描电子显微镜、显微硬度计、CSPM5500扫描探针显微镜、X射线衍射仪、往复式摩擦磨损仪等分析测试手段,研究氮气流量对薄膜形貌、成分、结构、硬度、表面粗糙度、耐磨损等性能的影响.结果表明,随着氮气流量的增加,薄膜的显微硬度、膜厚都逐渐降低,膜基结合力逐渐增加,膜基结合力在16 m L/min时达到最大67.2 N;表面粗糙度和平均摩擦系数均在8 m L/min时最低.随着氮气流量增加,薄膜主要生长取向由(200)晶面转向(111)晶面生长;Ti N薄膜的颜色也随氮气流量增大而加深,8 m L/min和12 m L/min时为金黄色,4 m L/min和16 m L/min时颜色较差.
