Electrochemiluminescence(ECL)has attracted considerable interest for many applications such as microscopy,(bio)analysis,light-emitting materials or devices.In this work,we report the fabrication and characterization o...Electrochemiluminescence(ECL)has attracted considerable interest for many applications such as microscopy,(bio)analysis,light-emitting materials or devices.In this work,we report the fabrication and characterization of ECL-active hydrogel films with tunable thickness.The redox films were prepared by electrochemically-assisted radical polymerization by potential cycling of a PBS solution containing the monomer N-isopropylacrylamide,the initiator potassium persulfate,the cross-linker N,N′-methylenebis(acrylamide)and the Ru(bpy)3 monomer.The deposits were easily prepared in a rapid and well-controlled one-step procedure.The resulting homogeneous films are composed of a poly(N-isopropylacrylamide)(pNIPAM)matrix,which incorporates covalently[Ru(bpy)_(3)]^(2+)centers.The thickness and the number of ECL-active sites is tuned by control-ling the number of voltammetric scans.The deposited pNIPAM films are permeable to water-soluble chemicals such as the coreactant tri-n-propylamine(TPrA).The voltammetric characterization shows a continuous increase of the number of redox-active sites.Results indicate that ECL signals are proportional to the number of electrodeposited[Ru(bpy)_(3)]^(2+)centers.Such approach combining ECL and stimuli-responsive hydrogels open exciting prospects for developing new(bio)sensing materials.展开更多
A three dimensional electro assisted photocatalytic system was constituted with granular TiO 2 as the photocatalyst. The photocatalytic efficiency of phenol degradation was observed to be 10% and 33.6% , respectively,...A three dimensional electro assisted photocatalytic system was constituted with granular TiO 2 as the photocatalyst. The photocatalytic efficiency of phenol degradation was observed to be 10% and 33.6% , respectively, for common water electrolysis and photocatalysis, while it is increased to 82.8% for the combination of them i.e., the electro assisted photocatalytic system. According to the experimental results, both water electrolysis and anode bias were considered to be responsible for the electro synergism, which may effectively provide active oxygen source and prevent further recombination of photo generated charges.展开更多
采用电化学辅助沉积方法对AZ31B镁合金进行硅烷化处理,借助于动电位极化曲线和电化学阻抗谱等电化学测试手段研究了γ-(甲基丙烯酰氧基)丙基三甲氧基硅烷(KH-570)添加量对膜层质量及耐蚀性能的影响,并比较了利用羟基磷灰石(HA)颗粒、铈...采用电化学辅助沉积方法对AZ31B镁合金进行硅烷化处理,借助于动电位极化曲线和电化学阻抗谱等电化学测试手段研究了γ-(甲基丙烯酰氧基)丙基三甲氧基硅烷(KH-570)添加量对膜层质量及耐蚀性能的影响,并比较了利用羟基磷灰石(HA)颗粒、铈盐离子(Ce^(3+))两种改性物质改良硅烷溶液后所制得膜层的质量及耐蚀性能。结果表明:AZ31B镁合金经电化学辅助沉积硅烷处理后,表面生成一层均匀而致密的硅烷透明膜层,有效地减缓了镁合金的腐蚀行为,促使其自腐蚀电流密度大大降低;在硅烷电化学辅助沉积处理过程中,KH-570存在最佳添加量,当其添加体积约为8 m L时所制备出的硅烷膜层质量最好、耐蚀性能最佳;通过改良硅烷溶液,电化学辅助沉积制备的硅烷膜层质量进一步提高,Ce^(3+)改良效果更佳。展开更多
The electrochemically assisted photocatalytic degradation of direct sky blue aqueous solution with three dimensional electrodes was studied. The degradation rates as high as 99%, with a high decolorization ratios of 9...The electrochemically assisted photocatalytic degradation of direct sky blue aqueous solution with three dimensional electrodes was studied. The degradation rates as high as 99%, with a high decolorization ratios of 96 8% and TOC concentration reduction of about 80 5% were observed during a period of 30 min in presence of both photocatalyst and filler electrodes. The kinetics of electrochemically assisted photocatalytic degradation of direct sky blue was also investigated.展开更多
基金supported by the Agence Nationale de la Recherche(NEOCASTIP ANR-15-CE09-0015-03)HL acknowledges the Natural Science Foundations of Jiangsu Province(No.BK20180893).
文摘Electrochemiluminescence(ECL)has attracted considerable interest for many applications such as microscopy,(bio)analysis,light-emitting materials or devices.In this work,we report the fabrication and characterization of ECL-active hydrogel films with tunable thickness.The redox films were prepared by electrochemically-assisted radical polymerization by potential cycling of a PBS solution containing the monomer N-isopropylacrylamide,the initiator potassium persulfate,the cross-linker N,N′-methylenebis(acrylamide)and the Ru(bpy)3 monomer.The deposits were easily prepared in a rapid and well-controlled one-step procedure.The resulting homogeneous films are composed of a poly(N-isopropylacrylamide)(pNIPAM)matrix,which incorporates covalently[Ru(bpy)_(3)]^(2+)centers.The thickness and the number of ECL-active sites is tuned by control-ling the number of voltammetric scans.The deposited pNIPAM films are permeable to water-soluble chemicals such as the coreactant tri-n-propylamine(TPrA).The voltammetric characterization shows a continuous increase of the number of redox-active sites.Results indicate that ECL signals are proportional to the number of electrodeposited[Ru(bpy)_(3)]^(2+)centers.Such approach combining ECL and stimuli-responsive hydrogels open exciting prospects for developing new(bio)sensing materials.
文摘A three dimensional electro assisted photocatalytic system was constituted with granular TiO 2 as the photocatalyst. The photocatalytic efficiency of phenol degradation was observed to be 10% and 33.6% , respectively, for common water electrolysis and photocatalysis, while it is increased to 82.8% for the combination of them i.e., the electro assisted photocatalytic system. According to the experimental results, both water electrolysis and anode bias were considered to be responsible for the electro synergism, which may effectively provide active oxygen source and prevent further recombination of photo generated charges.
文摘采用电化学辅助沉积方法对AZ31B镁合金进行硅烷化处理,借助于动电位极化曲线和电化学阻抗谱等电化学测试手段研究了γ-(甲基丙烯酰氧基)丙基三甲氧基硅烷(KH-570)添加量对膜层质量及耐蚀性能的影响,并比较了利用羟基磷灰石(HA)颗粒、铈盐离子(Ce^(3+))两种改性物质改良硅烷溶液后所制得膜层的质量及耐蚀性能。结果表明:AZ31B镁合金经电化学辅助沉积硅烷处理后,表面生成一层均匀而致密的硅烷透明膜层,有效地减缓了镁合金的腐蚀行为,促使其自腐蚀电流密度大大降低;在硅烷电化学辅助沉积处理过程中,KH-570存在最佳添加量,当其添加体积约为8 m L时所制备出的硅烷膜层质量最好、耐蚀性能最佳;通过改良硅烷溶液,电化学辅助沉积制备的硅烷膜层质量进一步提高,Ce^(3+)改良效果更佳。
文摘The electrochemically assisted photocatalytic degradation of direct sky blue aqueous solution with three dimensional electrodes was studied. The degradation rates as high as 99%, with a high decolorization ratios of 96 8% and TOC concentration reduction of about 80 5% were observed during a period of 30 min in presence of both photocatalyst and filler electrodes. The kinetics of electrochemically assisted photocatalytic degradation of direct sky blue was also investigated.
