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Related Concept Videos

Hydrogen Bonds00:26

Hydrogen Bonds

Hydrogen BondsHydrogen bonds are weak attractions between atoms that have formed other chemical bonds. One of these atoms is electronegative, like oxygen, and has a partial negative charge. The other is a hydrogen atom that has bonded with another electronegative atom and has a partial positive charge.Hydrogen Bonds Control the World!Because hydrogen has very weak electronegativity when it binds with a strongly electronegative atom, such as oxygen or nitrogen, electrons in the bond are...
Hydrogen Bonds01:04

Hydrogen Bonds

A hydrogen bond is formed when a weakly positive hydrogen atom already bonded to one electronegative atom (for example, the oxygen in the water molecule) is attracted to another electronegative atom from another polar molecule, such as water (H2O), hydrogen fluoride (HF), or ammonia (NH3). The huge electronegativity difference between the H atom (2.1) and the atom to which it is bonded (4.0 for an F atom, 3.5 for an O atom, or 3.0 for an N atom), combined with the very small size of an H atom...
Heterogeneous Catalysis01:22

Heterogeneous Catalysis

Heterogeneous catalysis involves a catalyst in a different phase from the reactants. It is a process where the catalyst and the reactants are in distinct phases, typically solid and gas or liquid.Most heterogeneous catalysts are metals, metal oxides, or acids. The list includes transition metals like iron (Fe), cobalt (Co), nickel (Ni), palladium (Pd), platinum (Pt), chromium (Cr), manganese (Mn), tungsten (W), silver (Ag), and copper (Cu). These metals possess partially vacant d orbitals that...

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A Simple, Low-cost, and Robust System to Measure the Volume of Hydrogen Evolved by Chemical Reactions with Aqueous Solutions
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Active Site Engineering in CoP@NC/Graphene Heterostructures Enabling Enhanced Hydrogen Evolution.

Manman Guo1, Fen Qiu1,2, Yuxi Yuan1

  • 1Jiangxi Key Laboratory of Nanomaterials and Sensors, School of Physics, Communication and Electronics, Jiangxi Normal University, Nanchang 330022, Jiangxi, People's Republic of China.

Inorganic Chemistry
|October 14, 2021
PubMed
Summary

Engineered N-doped carbon-encapsulated CoP nanoparticles on graphene significantly boost hydrogen evolution reaction (HER) performance. This active site engineering optimizes electronic structure and increases active sites, leading to enhanced catalytic activity and stability.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • The active site is crucial for electrocatalyst performance in the hydrogen evolution reaction (HER).
  • Developing efficient electrocatalysts is key for sustainable hydrogen production.

Purpose of the Study:

  • To engineer active sites in N-doped carbon-encapsulated CoP nanoparticles on graphene (CoP@NC/GR) for enhanced HER.
  • To improve the electronic structure and increase active sites of CoP-based electrocatalysts.

Main Methods:

  • Synthesis of CoP@NC/GR heterostructures from a bimetallic metal-organic framework (MOF)@graphene oxide composite.
  • Characterization using X-ray photoelectron spectroscopy (XPS) and density functional theory (DFT) calculations.
  • Optimization of the Zn/Co ratio in the bimetallic MOF to engineer the sandwich-like structure.

Main Results:

  • Tailoring the carbon matrix modulated the electronic structure of CoP, reducing hydrogen adsorption energy (ΔGH*) from -0.53 to 0.04 eV.
  • Optimizing the structure increased active sites, leading to low overpotentials (105 mV in H2SO4, 125 mV in KOH at 10 mA cm-2).
  • Achieved accelerated HER kinetics (Tafel slope of 47.5 mV dec-1) and remarkable stability.

Conclusions:

  • Active site engineering is an effective strategy to enhance HER performance.
  • The CoP@NC/GR electrocatalyst demonstrates significant potential for efficient hydrogen production.
  • The study highlights the importance of synergistic effects between the active material, carbon matrix, and structural design.