分别采用乙二醇(EG)和H2O为溶剂,通过NaBH4还原法在酸性pH≤2和碱性pH≥12条件下制备了铂担载量为20%(质量分数)的Pt/C催化剂,利用TEM、CV及LSV等方法对催化剂进行了表征与测试,考察了EG在NaBH4还原法中对铂纳米颗粒的稳定作用。结果表...分别采用乙二醇(EG)和H2O为溶剂,通过NaBH4还原法在酸性pH≤2和碱性pH≥12条件下制备了铂担载量为20%(质量分数)的Pt/C催化剂,利用TEM、CV及LSV等方法对催化剂进行了表征与测试,考察了EG在NaBH4还原法中对铂纳米颗粒的稳定作用。结果表明,EG作溶剂、碱性pH≥12时,通过NaBH4还原法制备得到了平均粒径约2.5nm、粒径分布窄、在碳载体上分散均匀的Pt/C催化剂;该催化剂的电化学比表面为74.4m2/g Pt,0.8V vs NHE时通过LSV得到的单位质量铂对甲醇电催化氧化的电流密度为229.1mA/mg Pt,分别是相同条件下H2O作溶剂时制备得到的Pt/C催化剂的5.倍和5.3倍。展开更多
In this work,a series of chitin-supported Ru catalysts,composed of ultrasmall Ru nanoparticles supported on the chitin nanofibers,with different Ru content from 0.07 wt%to 0.93 wt%,are fabricated.Results from catalyze...In this work,a series of chitin-supported Ru catalysts,composed of ultrasmall Ru nanoparticles supported on the chitin nanofibers,with different Ru content from 0.07 wt%to 0.93 wt%,are fabricated.Results from catalyzed NaBH4 hydrolysis experiments indicate that the catalytic activity of the fabricated chitin-supported Ru catalysts increases gradually with the decreasing of Ru content.The rate of hydrogen generation from NaBH4 hydrolysis catalyzed by the catalyst with 0.07 wt%Ru content is as high as 55.29 L min 1 gRu-1 at 30℃,and this reaction exhibits activation energy of 39.16 kJ/mol.The augment of NaBH4 dosage in the experiments does not weaken the catalytic activity.In addition,the fabricated chitin-supported Ru catalysts show excellent durability in NaBH4 hydrolysis,with only 9.2%activity loss after used for 20 cycles.With excellent catalytic activity and durability,the as-obtained Ru catalysts provide a promising choice for promoting hydrogen production from NaBH4 hydrolysis.展开更多
Ru and Co are highly dispersed on the surface of TiO2 nanopa rticles with an easy coprecipitation method to fabricate a novel Ru-based catalyst(Ru/Co-TiO2).The fabricated Ru/Co-TiO2 catalyst exhibits superior catalyti...Ru and Co are highly dispersed on the surface of TiO2 nanopa rticles with an easy coprecipitation method to fabricate a novel Ru-based catalyst(Ru/Co-TiO2).The fabricated Ru/Co-TiO2 catalyst exhibits superior catalytic performance for promoting NaBH4 hydrolysis in alkaline medium,showing an impressive hydrogen generation rate per gram Ru as high as 172 L min-1 gRu-1 which is better than most of recently reported Ru-based catalysts.In addition,the fabricated Ru/Co-TiO2 catalyst also shows excellent du rability in cycle use,with only 2.9% activity loss after being used for 5 cycles.These advantages make the developed Ru/Co-TiO2 catalyst a potential choice for promoting hydrogen generation from NaBH4 hydrolysis.展开更多
文摘分别采用乙二醇(EG)和H2O为溶剂,通过NaBH4还原法在酸性pH≤2和碱性pH≥12条件下制备了铂担载量为20%(质量分数)的Pt/C催化剂,利用TEM、CV及LSV等方法对催化剂进行了表征与测试,考察了EG在NaBH4还原法中对铂纳米颗粒的稳定作用。结果表明,EG作溶剂、碱性pH≥12时,通过NaBH4还原法制备得到了平均粒径约2.5nm、粒径分布窄、在碳载体上分散均匀的Pt/C催化剂;该催化剂的电化学比表面为74.4m2/g Pt,0.8V vs NHE时通过LSV得到的单位质量铂对甲醇电催化氧化的电流密度为229.1mA/mg Pt,分别是相同条件下H2O作溶剂时制备得到的Pt/C催化剂的5.倍和5.3倍。
基金Chengdu University of Technology(No.10912-2019KYQD07208)。
文摘In this work,a series of chitin-supported Ru catalysts,composed of ultrasmall Ru nanoparticles supported on the chitin nanofibers,with different Ru content from 0.07 wt%to 0.93 wt%,are fabricated.Results from catalyzed NaBH4 hydrolysis experiments indicate that the catalytic activity of the fabricated chitin-supported Ru catalysts increases gradually with the decreasing of Ru content.The rate of hydrogen generation from NaBH4 hydrolysis catalyzed by the catalyst with 0.07 wt%Ru content is as high as 55.29 L min 1 gRu-1 at 30℃,and this reaction exhibits activation energy of 39.16 kJ/mol.The augment of NaBH4 dosage in the experiments does not weaken the catalytic activity.In addition,the fabricated chitin-supported Ru catalysts show excellent durability in NaBH4 hydrolysis,with only 9.2%activity loss after used for 20 cycles.With excellent catalytic activity and durability,the as-obtained Ru catalysts provide a promising choice for promoting hydrogen production from NaBH4 hydrolysis.
文摘Ru and Co are highly dispersed on the surface of TiO2 nanopa rticles with an easy coprecipitation method to fabricate a novel Ru-based catalyst(Ru/Co-TiO2).The fabricated Ru/Co-TiO2 catalyst exhibits superior catalytic performance for promoting NaBH4 hydrolysis in alkaline medium,showing an impressive hydrogen generation rate per gram Ru as high as 172 L min-1 gRu-1 which is better than most of recently reported Ru-based catalysts.In addition,the fabricated Ru/Co-TiO2 catalyst also shows excellent du rability in cycle use,with only 2.9% activity loss after being used for 5 cycles.These advantages make the developed Ru/Co-TiO2 catalyst a potential choice for promoting hydrogen generation from NaBH4 hydrolysis.
