Amorphous NiMo_(3)S_(13)/nickel foam integrated anode for lithium-ion batteries

Although crystalline anode materials with long-range ordered lattice structure are in favor of facilitating the electron transfer,their structures are easily disrupted during long-term cycling due to the continuous embedding/de-embedding of lithium ions.In contrast,the amorphous materials have abundant defects and lithium ion storage sites,refl ecting a superior reaction kinetics and long-term cycling stability.Here,we synthesize an integrated hybrid anode by in-situ loading amorphous NiMo_(3)S_(13)nanosheets on nickel foam substrate.Benefi ting from the introduction of Ni^(2+)that amorphizes the molybdenumsulfur clusters,the assembled lithium ion battery based on the integrated NiMo_(3)S_(13)/nickel foam anode delivers a specifi c capacity up to 1659 mA·h·g^(−1)at a current density of 0.6 A·g^(−1)and exhibits superior rate/cycling performance.

Recent advances of nanoporous metal-based catalyst: synthesis, application and perspectives

Nanoporous metal-based catalysts with the specific bicontinuous interconnected ligaments/pores network exhibit highly active performances in application for energy conversion, which represent a broader trend in the design of catalyst materials. These promising nanomaterials commendably provide highly conductive porous morphologies with reduced contact resistances, large electrochemical surface areas with enhanced catalytic efficiency, and controllable synthesis for regulating the performances. Thus, we highlight recent designs of nanoporous metals, alloys, transition metal compounds and hierarchical structures mainly employed in catalysis process. We discuss applied strategies to utilize characteristics of nanoporous metals in the energetic field of catalytic reactions. Moreover, development and evolution of novel controllable synthesis methods are applied in preparation of nanoporous non-noble metals and transition metal compounds. Finally, we present some outlooks and perspectives on the nanoporous metal catalyst and suggest ways for achieving alternative materials in catalysis applications.

Intermetallic Cu_(5)Zr Clusters Anchored on Hierarchical Nanoporous Copper as Efficient Catalysts for Hydrogen Evolution Reaction

Designing highly active and robust platinum-free electrocatalysts for hydrogen evolution reaction is vital for large-scale and efficient production of hydrogen through electrochemical water splitting.Here,we report nonprecious intermetallic Cu_(5)Zr clusters that are in situ anchored on hierarchical nanoporous copper(NP Cu/Cu_(5)Zr)for efficient hydrogen evolution in alkaline medium.By virtue of hydroxygenated zirconium atoms activating their nearby Cu-Cu bridge sites with appropriate hydrogenbinding energy,the Cu_(5)Zr clusters have a high electrocatalytic activity toward the hydrogen evolution reaction.Associated with unique architecture featured with steady and bicontinuous nanoporous copper skeleton that facilitates electron transfer and electrolyte accessibility,the self-supported monolithic NP Cu/Cu_(5)Zr electrodes boost violent hydrogen gas release,realizing ultrahigh current density of 500mAcm^(-2) at a low potential of-280mV versus reversible hydrogen electrode,with exceptional stability in 1M KOH solution.The electrochemical properties outperform those of state-of-the-art nonprecious metal electrocatalysts and make them promising candidates as electrodes in water splitting devices.