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Related Concept Videos

Catalysis01:27

Catalysis

Catalysis influences the rate of chemical reactions by providing an alternative reaction pathway with lower activation energy. A catalyst speeds up a reaction, but it is not consumed during the process. The fundamental principle of catalysis is the ability of a catalyst to alter the reaction mechanism, often introducing a more efficient pathway than the uncatalyzed process.In a catalyzed reaction, the catalyst participates directly in the reaction mechanism. It interacts with reactants to form...
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...
Microbial Fuel Cells01:23

Microbial Fuel Cells

Microbial fuel cells (MFCs) are bioelectrochemical devices that generate electricity by exploiting the metabolic processes of electrogenic bacteria. These systems provide a renewable energy source and serve as an innovative method for treating organic waste, such as wastewater.A typical MFC consists of two chambers: an anoxic (oxygen-free) compartment that houses the bacteria and an oxic (oxygen-rich) compartment that contains oxygen as the terminal electron acceptor. Many MFCs use proton...

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Porous Plate-like MoP Assembly as an Efficient pH-Universal Hydrogen Evolution Electrocatalyst.

Yanqing Jiao1, Haijing Yan1, Ruihong Wang1

  • 1Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education of China, Heilongjiang University, Harbin 150080, China.

ACS Applied Materials & Interfaces
|October 22, 2020
PubMed
Summary

This study introduces a novel porous molybdenum phosphide (MoP) catalyst, MoP@NPSC, for efficient hydrogen evolution reaction (HER) across all pH levels. The advanced catalyst demonstrates excellent stability and performance comparable to platinum, even in alkaline conditions.

Keywords:
N, P, S-triple-doped carbonegg whitehierarchical poresmolybdenum phosphidepH-universal HER

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Molybdenum phosphide (MoP) shows promise for hydrogen evolution reaction (HER) catalysis.
  • Developing MoP-based catalysts effective across a wide pH range remains a challenge.

Purpose of the Study:

  • To synthesize a novel molybdenum phosphide catalyst (MoP@NPSC) for efficient HER.
  • To achieve a catalyst that performs well in alkaline, neutral, and acidic media.

Main Methods:

  • Preparation of porous MoP@NPSC via assembly of phosphomolybdic acid and egg white, followed by phosphorization.
  • Characterization of the catalyst's structure, composition, and electrochemical properties.
  • Testing HER performance in various electrolytes and long-term stability assessments.

Main Results:

  • MoP@NPSC exhibits low overpotentials for HER: 50 mV (alkaline), 76 mV (neutral), and 71 mV (acidic) at 10 mA cm⁻².
  • The catalyst shows excellent stability with no significant attenuation after 40 hours.
  • MoP@NPSC demonstrates comparable or superior performance to commercial Pt/C in 1 M KOH.
  • An electrolyzer using MoP@NPSC achieves 10 mA cm⁻² at 1.52 V and can be powered by a solar cell.

Conclusions:

  • The porous MoP@NPSC catalyst is highly efficient and stable for HER across diverse pH conditions.
  • The catalyst's performance is attributed to its unique structure, including small MoP flakes, N, P, S-doped carbon coating, and porosity.
  • MoP@NPSC represents a promising alternative to noble metal catalysts for electrochemical water splitting.