Ni-Doped Cobalt Phosphide Nanoparticles for Water Splitting
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Solution Overview
Problem
Current water splitting technologies face inefficiencies due to high overpotentials and limited bifunctional activity in oxygen evolution reaction (OER) and hydrogen evolution reaction (HER), particularly in alkaline electrolytes, where precious metal-based catalysts are costly and rare, and existing non-precious metal catalysts are not suitable for both reactions, limiting their application in electrolyzers and other energy systems.
Innovation Solution
Development of high surface area, nickel (Ni) doped cobalt phosphide/phosphate nanoparticles that exhibit bifunctional activity for both OER and HER, with adjustable Ni:Co ratios to optimize surface area and catalytic site density, enabling lower overpotentials and efficient water splitting in alkaline conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If precious metal-based catalysts are used, then catalytic activity for OER or HER is improved, but cost and rarity become problematic
Solution Approach 1:
The patent replaces expensive precious metal catalysts with earth-abundant nickel-cobalt phosphide nanoparticles that are cost-effective and readily available, maintaining catalytic functionality while eliminating the cost and rarity constraints of precious metals
Solution Approach 2:
The patent creates a composite nickel-cobalt phosphide material that combines the benefits of both nickel and cobalt to achieve bifunctional catalytic activity, leveraging synergistic effects to match or exceed precious metal performance at lower cost
2Reliability
If single metal catalysts are used, then high activity for one reaction is achieved, but bifunctional activity for both OER and HER is limited
Solution Approach 1:
The nickel-cobalt phosphide nanoparticle catalyst is designed to perform both oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) functions simultaneously, making it a universal bifunctional catalyst that eliminates the need for separate catalysts for each reaction
Solution Approach 2:
The composite nickel-cobalt phosphide structure integrates both nickel and cobalt elements to provide complementary catalytic sites that facilitate both OER and HER, achieving versatility that single metal catalysts cannot provide
3Productivity
If conventional catalysts are used, then water splitting can occur, but high overpotentials reduce efficiency
Solution Approach 1:
The patent optimizes the nickel-to-cobalt ratio and nanoparticle size parameters to minimize overpotential and maximize catalytic efficiency, using controlled synthesis to achieve optimal structural and compositional parameters that reduce energy losses
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
The Ni doped cobalt phosphide/phosphate nanoparticles provide an economical and efficient electrocatalyst for water splitting, achieving activities comparable to precious metals with reduced material usage and lower overpotentials, enhancing the performance of both OER and HER reactions.
Implementation Method 1
low temperature water electrolysis, with the two half-reactions being the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER)
Implementation Method 2
Ni doped cobalt phosphide/phosphate nanoparticles that exhibit bifunctional activity for both OER and HER
Data Source
AI summary
The present disclosure is directed to cobalt and nickel cobalt phosphide/phosphate electrocatalyst nanoparticles for catalyzing electrochemical reactions, such as water splitting. The nanoparticles are formed into electrodes that have bi-functional oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) capabilities.