Ternary Pyrite-Phase Phosphochalcogenide Electrocatalysts for Hydrogen Evolution
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Solution Overview
Problem
The search for cost-effective, earth-abundant materials with high hydrogen evolution reaction (HER) activity and stability is crucial for large-scale hydrogen production, as noble metals like platinum are expensive and scarce. Existing earth-abundant transition metal compounds, such as pyrite structure-type transition metal dichalcogenides, show promise but require further enhancement for efficient solar-driven hydrogen production.
Innovation Solution
Ternary pyrite-phase transition metal phosphochalcogenide electrocatalysts, specifically cobalt phosphosulfide (CoPS) and nickel phosphoselenide (NiP1.93Se0.07), are developed, characterized by a single alloy phase with a pyrite crystal structure, which are synthesized through thermal conversion methods and demonstrate superior catalytic performance in hydrogen evolution reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If noble metals such as platinum are used as catalysts for hydrogen evolution reaction, then high catalytic activity is achieved, but cost and elemental abundance become limiting factors
Solution Approach 1:
The patent replaces expensive noble metal catalysts (platinum) with earth-abundant transition metal phosphides (FeP, CoP, NiP, CuP) that are cheaper and more abundant. These phosphide catalysts maintain high catalytic activity for hydrogen evolution reaction while being economically viable for large-scale applications.
Solution Approach 2:
The patent modifies the catalyst composition by creating ternary phosphide compounds (e.g., Fe-P-S, Co-P-Se, Ni-P-Te) with controlled stoichiometry and phase structure. This parameter optimization enhances catalytic activity to approach or exceed platinum performance while maintaining earth-abundant composition.
2Quantity of substance
If earth-abundant transition metal compounds are used as catalysts, then cost and abundance are improved, but catalytic activity and stability require further enhancement
Solution Approach 1:
The patent develops ternary composite phosphide materials combining transition metals with phosphorus and chalcogen elements (S, Se, Te). Examples include FeP1-xSx, CoP1-xSx, NiP1-xSx, CuP1-xSx compositions that leverage synergistic effects to achieve high catalytic activity comparable to noble metals.
Solution Approach 2:
The patent optimizes local composition and phase distribution within the catalyst material. By controlling the stoichiometry (e.g., P1-xSx ratios) and creating specific pyrite-phase structures, the catalyst achieves optimal local electronic properties and surface characteristics that maximize hydrogen evolution reaction activity.
3Ease of manufacture
If pyrite structure-type transition metal dichalcogenides are used, then cost-effectiveness is improved, but solar-driven hydrogen production efficiency needs enhancement
Solution Approach 1:
The patent transitions from binary dichalcogenides to ternary phosphochalcogenide compounds with optimized P:chalcogen ratios. This compositional parameter change, combined with pyrite-phase structure control, significantly enhances solar-to-hydrogen conversion efficiency while maintaining cost-effectiveness through earth-abundant materials.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
These ternary electrocatalysts exhibit geometric current densities of 10 mA/cm2 at low overpotentials and maintain long-term stability, approaching the performance of platinum in solar-driven hydrogen production, making them highly effective for earth-abundant, sustainable hydrogen generation.
Implementation Method 1
ternary pyrite-phase transition metal phosphochalcogenide electrocatalysts... demonstrate superior catalytic performance in hydrogen evolution reactions
Implementation Method 2
the free electrons induce the reduction of the oxidant at the ternary pyrite-phase transition metal phosphochalcogenide-fluid interface to form a reduction product
Implementation Method 3
exposing a transition metal-containing precursor disposed on a substrate to a chalcogen-phosphorous atmosphere at an elevated temperature and for a period of time sufficient to convert the transition metal-containing precursor to a ternary pyrite-phase transition metal phosphochalcogenide
Data Source
AI summary
Electrodes for catalyzing electrochemical reactions (e.g., the hydrogen evolution reaction) are provided. The electrode may comprise a ternary pyrite-phase transition metal phosphochalcogenide (e.g., CoPS) disposed on a substrate, wherein the ternary pyrite-phase transition metal phosphochalcogenide is a solid material of a ternary compound of a transition metal, phosphorous (P), and a chalcogen, the solid material characterized by a substantially single, ternary alloy phase having a pyrite crystal structure. Methods of using and making the electrodes are also provided.