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Metal-Ligand Bonds02:51

Metal-Ligand Bonds

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The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
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Chemolithotrophs are microorganisms that obtain energy by oxidizing inorganic molecules such as hydrogen gas (H₂), ammonia (NH₃), reduced sulfur compounds (H₂S, S²⁻), and ferrous iron (Fe²⁺). Unlike heterotrophic organisms that rely on organic carbon, chemolithotrophs transfer electrons from these inorganic donors to the electron transport chain (ETC), generating a proton motive force (PMF) that drives ATP synthesis through oxidative phosphorylation.
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Electrodeposition01:08

Electrodeposition

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Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
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Ladder Diagrams: Redox Equilibria01:30

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Ladder diagrams are useful tools for understanding redox equilibrium reactions, especially the effects of concentration changes on the electrochemical potential of the reaction. The vertical axis in the redox ladder diagrams represents the electrochemical potential, E. The area of predominance is demarcated using the Nernst equation.
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A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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Spontaneous Chemical Reactions
Spontaneous redox reactions occur abundantly in nature. The chemical reaction occurring in a disposable AA battery powering our remote controls is one such example of a spontaneous redox reaction. Another example is the immersion of coiled copper wire into an aqueous silver nitrate solution. The reaction shows a gradual, visually impressive color change from colorless to bright blue and the formation of a grey precipitate on the copper wire. In this experiment,...
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Modulated metal-support interactions for efficient nitrate electroreduction at positive potentials.

Yixiang Tang1, Yuchi Wan2, Wei Yan1

  • 1Institute of New Energy Materials and Engineering, State Key Laboratory of Green and Efficient Development of Phosphorus Resources, Fujian Engineering Research Center of High Energy Batteries and New Energy Equipment & Systems, School of Materials Science and Engineering, Fuzhou University, Fuzhou, China.

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This summary is machine-generated.

Electrochemical nitrate upgrading using ruthenium clusters on cobalt hydroxide achieves high energy efficiency (~100% NH3 Faradaic efficiency) and stability. This sustainable method optimizes nitrogen cycle repair and waste upcycling.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Environmental Science

Background:

  • The nitrogen cycle is unbalanced, necessitating sustainable solutions.
  • Electrochemical nitrate upgrading offers a promising route for nitrogen cycle repair.
  • Low energy efficiency due to high overpotential hinders industrial application.

Purpose of the Study:

  • To develop highly energy-efficient electrocatalysts for nitrate reduction.
  • To investigate the role of metal-support interactions in enhancing catalytic performance.
  • To achieve efficient ammonia synthesis from nitrate at positive potentials.

Main Methods:

  • Fabrication of ruthenium (Ru) clusters supported on metal hydroxide (Co(OH)2) via a self-corrosion strategy.
  • Modulation of metal-support interactions to optimize nitrate adsorption and water dissociation.
  • Electrochemical evaluation of catalyst performance, including energy efficiency and Faradaic efficiency for ammonia production.
  • Long-term stability testing at industrial-scale current densities.
  • Assembly of a rechargeable hybrid battery system for waste upcycling and energy conversion.

Main Results:

  • Co(OH)2-supported Ru catalysts with moderate metal-support interaction demonstrated high energy efficiency (49.5%) and near-complete ammonia selectivity (~100% Faradaic efficiency).
  • The catalyst exhibited excellent long-term stability (>1200 hours) at a high current density (200 mA cm−2).
  • The integrated hybrid battery system showed potential for simultaneous waste upcycling and energy conversion.

Conclusions:

  • Metal-support interaction is crucial for enhancing nitrate electroreduction efficiency at positive potentials.
  • The developed Ru/Co(OH)2 catalyst offers a sustainable and efficient pathway for ammonia synthesis and nitrogen cycle management.
  • This approach holds significant promise for industrial applications in waste remediation and energy conversion.