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Thiol Ligand-Modified Au for Highly Efficient Electroreduction of Nitrate to Ammonia
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作者 Yuheng Wu Xiangdong Kong +8 位作者 Yechao Su Jiankang Zhao Yiling Ma Tongzheng Ji Di Wu Junyang Meng Yan Liu Zhigang Geng Jie Zeng 《Precision Chemistry》 2024年第3期112-119,共8页
Electroreduction of nitrate(NO_(3)-)to ammonia(NH_(3))is an environmentally friendly route for NH_(3)production,serving as an appealing alternative to the Haber-Bosch process.Recently,various noble metal-based electro... Electroreduction of nitrate(NO_(3)-)to ammonia(NH_(3))is an environmentally friendly route for NH_(3)production,serving as an appealing alternative to the Haber-Bosch process.Recently,various noble metal-based electrocatalysts have been reported for electroreduction of NO_(3)-.However,the application of pure metal electrocatalysts is still limited by unsatisfactory performance,owing to the weak adsorption of nitrogen-containing intermediates on the surface of pure metal electrocatalysts.In this work,we report thiol ligand-modified Au nanoparticles as the effective electrocatalysts toward electroreduction of NO_(3)-.Specifically,three mercaptobenzoic acid(MBA)isomers,thiosalicylic acid(ortho-MBA),3-mercaptobenzoic acid(meta-MBA),and 4-mercaptobenzoic acid(para-MBA),were employed to modify the surface of the Au nanocatalyst.During the NO_(3)-electroreduction,para-MBA modified Au(denoted as para-Au/C)displayed the highest catalytic activity among these Au-based catalysts.At-1.0 V versus reversible hydrogen electrode(vs RHE),para-Au/C exhibited a partial current density for NH_(3)of 472.2 mA cm^(-2),which was 1.7 times that of the pristine Au catalyst.Meanwhile,the Faradaic efficiency(FE)for NH_(3)reached 98.7%at-1.0 V vs RHE for para-Au/C.The modification of para-MBA significantly improved the intrinsic activity of the Au/C catalyst,thus accelerating the kinetics of NO_(3)-reduction and giving rise to a high NH_(3)yield rate of para-Au/C. 展开更多
关键词 Ammonia synthesis NO_(3)-electroreduction Au nanoparticles thiol ligand modification electronic structure
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Shell-thickness dependent optical properties of CdSe/ CdS core/shell nanocrystals coated with thiol ligands
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作者 Wanzhen Lin Yuan Niu +5 位作者 Renyang Meng Lin Huang Hujia Cao Zhenxing Zhang Haiyan Qin Xiaogang Peng 《Nano Research》 SCIE EI CAS CSCD 2016年第1期260-271,共12页
Using CdSe/CdS core/shell nanocrystals with 1-10 monolayers of CdS shell as the model system, we studied effects of thiol ligands on optical properties of the nanocrystals. The core/shell nanocrystals with original li... Using CdSe/CdS core/shell nanocrystals with 1-10 monolayers of CdS shell as the model system, we studied effects of thiol ligands on optical properties of the nanocrystals. The core/shell nanocrystals with original ligands possessed near unity photoluminescence (PL) quantum yield and single-exponential PL decay dynamics. The effects of thiol ligands on optical properties were found to depend on the shell thickness, environment (with/without oxygen), and excitation power (single- or multi-exciton). Systematic and quantitative results reported in this work should provide necessary information for fundamental understanding and technical applications of quantum dots (QDs) coated with thiol ligands. 展开更多
关键词 colloidal semiconductor nanocrystals thiol ligands photoluminescencequantum yield single-dot spectroscopy
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半胱氨酸基硫醇配体分子侧链结构对其Ag(Ⅰ)配位聚合物的影响
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作者 吴思娴 陶丹丹 +3 位作者 原媛 严小胜 黎朝 江云宝 《厦门大学学报(自然科学版)》 CAS CSCD 北大核心 2020年第6期921-928,共8页
设计合成了硫醇类配体N-乙酰-L-半胱氨酰基苯胺(L-1)、N-乙酰-L-半胱氨酰基苯酚酯(L-2)和N-乙酰-L-半胱氨酰基乙酯(L-3),并采用紫外-可见光谱、荧光光谱、圆二色(CD)光谱、动态光散射(DLS)和扫描电子显微镜(SEM)等方法研究了乙醇中L-1~... 设计合成了硫醇类配体N-乙酰-L-半胱氨酰基苯胺(L-1)、N-乙酰-L-半胱氨酰基苯酚酯(L-2)和N-乙酰-L-半胱氨酰基乙酯(L-3),并采用紫外-可见光谱、荧光光谱、圆二色(CD)光谱、动态光散射(DLS)和扫描电子显微镜(SEM)等方法研究了乙醇中L-1~L-3与Ag^+配位后的光谱性质和形貌特征.结果表明:L-1和L-3与Ag^+形成了配位聚合物,观察到与Ag(Ⅰ)-Ag(Ⅰ)相互作用相关的吸收和荧光光谱信号,但这两个体系的光谱并不相同;而L-2则与Ag^+形成了配位寡聚物,其对应的吸收和荧光光谱信号均较弱且峰波长较短.Ag(Ⅰ)-L-1和Ag(Ⅰ)-L-3配位聚合物体系中还观察到对应吸收的CD信号,意味着手性氨基酸残基的分子手性已传递至超分子聚合物中与Ag(Ⅰ)-Ag(Ⅰ)相互作用相关的生色团上,这归因于配体侧链间的相互作用;而Ag(Ⅰ)-L-2配位寡聚物体系则无CD信号.据此推测,Ag(Ⅰ)-L-1和Ag(Ⅰ)-L-3配位聚合物中配体侧链间的相互作用可能是氢键作用,且二者的作用模式并不相同. 展开更多
关键词 配位聚合物 硫醇配体 Ag(Ⅰ)-Ag(Ⅰ)相互作用 氢键 荧光
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硫醇模板法组装金纳米粒子及其增强细胞色素c电化学活性研究
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作者 刘锋 梁景洪 +4 位作者 顾永万 杨冬霞 张敬东 Jens Ulstrup 毛秉伟 《中国科学:化学》 CAS CSCD 北大核心 2015年第4期405-411,共7页
采用烷基双硫醇修饰和配体交换的方法,将弱保护剂四辛基溴化铵(TOAB)保护的金纳米粒子(Au NPs)组装到电极表面,详细研究了合成条件和组装时间对纳米粒子的尺寸、形状和表面覆盖度的影响,并运用透射电镜(TEM)和扫描隧道显微镜(STM)进行... 采用烷基双硫醇修饰和配体交换的方法,将弱保护剂四辛基溴化铵(TOAB)保护的金纳米粒子(Au NPs)组装到电极表面,详细研究了合成条件和组装时间对纳米粒子的尺寸、形状和表面覆盖度的影响,并运用透射电镜(TEM)和扫描隧道显微镜(STM)进行了表征.采用此纳米粒子修饰的电极获得了良好的细胞色素c(Cyt.c)分子的电化学响应,研究了电极表面纳米粒子的覆盖度对Cyt.c电化学活性的影响,并讨论了Au NPs增强电子长程转移的影响因素. 展开更多
关键词 硫醇表面修饰 配体交换 纳米粒子组装 Cyt.c 长程电荷转移
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