Ru@RuO2 core-shell nanorods were successfully synthesized by heat-treating Ru nanorods with air oxidation through an accurate control of the temperature and time. The structure, composition, dimension, and adsorption ...Ru@RuO2 core-shell nanorods were successfully synthesized by heat-treating Ru nanorods with air oxidation through an accurate control of the temperature and time. The structure, composition, dimension, and adsorption property of the core-shell nanorods were well characterized with XRD and TEM. The catalytic activity and stability were electrochemically evaluated with a rotating disk electrode, a rotating ring-disk electrode, and chronopotentiometric methods. The Ru@RuO2 nanorods reveal excellent bifunctional catalytic activity and robust stability for both oxygen evolution reaction(OER) and hydrogen evolution reaction(HER). The overpotentials for OER and HER are 320 m V and 137 m V at the current density of10 m A cm-2, respectively. The catalytic activity of Ru@RuO2 nanorods for OER is 6.5 times higher than that of the state-of-the-art catalyst IrO2 according to the catalytic current density measured at 1.60 V(versus RHE).The catalytic activity of Ru@RuO2 nanorods for HER is comparable to 40%Pt/C by comparing the catalytic current densities at à0.2 V.展开更多
The electrooxidation of CO on Ru (0001) and RuO2 (100) electrode surfaces were characterized by cyclic voltammetry, AES and RHEED. The CO adlayer was first partially oxidized at 0.8 V, which is controlled by the atta...The electrooxidation of CO on Ru (0001) and RuO2 (100) electrode surfaces were characterized by cyclic voltammetry, AES and RHEED. The CO adlayer was first partially oxidized at 0.8 V, which is controlled by the attack of oxygen species toward the Ru(0001) surface. The remaining CO adlayer oxidation at 0.55 V is related to the combination of CO molecules with oxygen species already located on the surface. In contrast, successive peaks on RuO2(100) at 0.4 V and 0.72 V are observed, which shows that CO molecules can directly react with two different lattice-oxygen on the surface to carbon dioxide.展开更多
采用模板法,以SiO2为模板,盐酸多巴胺(PDA)为碳源,通过SiO2构筑具有高度连通的三维多孔结构的氮掺杂中空介孔碳纳米材料(NMHCS),然后以NMHCS为载体,通过简单的预沉淀法将钌负载在碳球表面,制备具有钌负载的氮掺杂中空介孔碳纳米材料电...采用模板法,以SiO2为模板,盐酸多巴胺(PDA)为碳源,通过SiO2构筑具有高度连通的三维多孔结构的氮掺杂中空介孔碳纳米材料(NMHCS),然后以NMHCS为载体,通过简单的预沉淀法将钌负载在碳球表面,制备具有钌负载的氮掺杂中空介孔碳纳米材料电催化剂(Ru/NMHCS),并利用氧气进一步氧化得到Ru/RuO2异质结构电催化剂材料。该异质结构的纳米催化剂材料对析氧反应(OER)表现出显著的电催化活性,电流密度在10 m A·cm^(-2)处的过电位为270 mV,明显优于基准贵金属催化剂RuO2。为贵金属电催化剂的制备提供实验技术参考。展开更多
基金the U.S.Department of the ArmyU.S.Army Materiel Command for supporting this work
文摘Ru@RuO2 core-shell nanorods were successfully synthesized by heat-treating Ru nanorods with air oxidation through an accurate control of the temperature and time. The structure, composition, dimension, and adsorption property of the core-shell nanorods were well characterized with XRD and TEM. The catalytic activity and stability were electrochemically evaluated with a rotating disk electrode, a rotating ring-disk electrode, and chronopotentiometric methods. The Ru@RuO2 nanorods reveal excellent bifunctional catalytic activity and robust stability for both oxygen evolution reaction(OER) and hydrogen evolution reaction(HER). The overpotentials for OER and HER are 320 m V and 137 m V at the current density of10 m A cm-2, respectively. The catalytic activity of Ru@RuO2 nanorods for OER is 6.5 times higher than that of the state-of-the-art catalyst IrO2 according to the catalytic current density measured at 1.60 V(versus RHE).The catalytic activity of Ru@RuO2 nanorods for HER is comparable to 40%Pt/C by comparing the catalytic current densities at à0.2 V.
文摘The electrooxidation of CO on Ru (0001) and RuO2 (100) electrode surfaces were characterized by cyclic voltammetry, AES and RHEED. The CO adlayer was first partially oxidized at 0.8 V, which is controlled by the attack of oxygen species toward the Ru(0001) surface. The remaining CO adlayer oxidation at 0.55 V is related to the combination of CO molecules with oxygen species already located on the surface. In contrast, successive peaks on RuO2(100) at 0.4 V and 0.72 V are observed, which shows that CO molecules can directly react with two different lattice-oxygen on the surface to carbon dioxide.
文摘采用模板法,以SiO2为模板,盐酸多巴胺(PDA)为碳源,通过SiO2构筑具有高度连通的三维多孔结构的氮掺杂中空介孔碳纳米材料(NMHCS),然后以NMHCS为载体,通过简单的预沉淀法将钌负载在碳球表面,制备具有钌负载的氮掺杂中空介孔碳纳米材料电催化剂(Ru/NMHCS),并利用氧气进一步氧化得到Ru/RuO2异质结构电催化剂材料。该异质结构的纳米催化剂材料对析氧反应(OER)表现出显著的电催化活性,电流密度在10 m A·cm^(-2)处的过电位为270 mV,明显优于基准贵金属催化剂RuO2。为贵金属电催化剂的制备提供实验技术参考。
