CuCo纳米片高效电催化还原硝酸盐产氨

从废水处理和低碳环保的角度出发,开发高效还原硝态氮(NO^(-)_(3))为氨(NH_(3))的电催化剂越来越受到人们的关注。在此,我们提出了一种生态友好,经济高效,生物仿生的Cu_(50)Co_(50)纳米片电催化剂,用于电化学还原NO^(-)_(3)到NH_(3)(NO^(-)_(3)RR),作为Haber-Bosch法生产氨过程的一个有前景的替代途径。Cu_(50)Co_(50)纳米片在-0.2 V vs.RHE的条件下产生NH_(3)的法拉第效率为100%±1%,电流密度为1035 mA·cm^(-2),对应的NH_(3)生产速率达到4.8 mmol·cm^(-2)·h-1(960 mmol·g^(-1)·h^(-1))。通过电化学原位红外光谱(FTIR)和原位壳层隔离纳米颗粒增强拉曼光谱(SHINERS)对NO^(-)_(3)RR过程中的中间物种进行检测,结合电化学测试,分析了其还原机理,并利用DFT计算对各反应步骤进行了验证。实验结果显示,铜(Cu)和钴(Co)之间有很强的协同作用,Co位点通过*H物种促进NO^(-)_(3)及其中间体加氢生成NH_(3)。

壳层隔绝纳米粒子增强拉曼光谱技术对丝织品上茜草染料的快速分析研究

采用壳层隔绝纳米粒子增强拉曼光谱对用传统染色方法模拟制作的茜草和化学纯茜素染色丝织品进行原位分析,得到丝织品上化学纯茜素和茜草染料的原位表面增强拉曼光谱。该方法实现了茜草染料的原位快速检测,相对于传统方法更加简便,避免了复杂的染料剥离前处理过程,在古代有机染料快速检测方面具有良好的应用前景。

Shell-isolated Nanoparticle-enhanced Raman Spectroscopy towards In-Situ Investigating of Interfacial Structure

Since the discovery of surface-enhanced Raman spectroscopy(SERS),it has been rapidly applied to the in situ study of electrochemical interfaces.Shell-isolated nanoparticle-enhanced Raman spectroscopy(SHINERS)stands out as one of the most powerful tools for the in situ study of interfacial structures,especially on well-defined single crystal surface.This perspective paper focuses on the study of interfacial structures with the SHINERS technique,including the electronic structure of heterogeneous metal surfaces,and the detection of molecules absorbed on the surface,as well as intermediate species,during electrochemical reactions.Finally,we present an outlook on future research and development of SHINERS for studying interfacial structures.