3D TiO2/Cu Microrod HER Electrocatalyst for Stable High-Current Operation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing noble metal-based hydrogen evolution reaction (HER) catalysts face issues such as agglomeration, low stability, and inefficiency under high current conditions, requiring high overpotentials and being difficult to immobilize on substrates, leading to reduced activity and detachment.
Innovation Solution
A Cu substrate coated with a 3D TiO2/Cu microrod array decorated with noble metal nanoparticles, particularly Ru, is developed to enhance stability and activity, utilizing an in-situ process for catalyst production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Pt/C catalyst is used for HER, then high initial activity is achieved, but stability degrades quickly due to Pt particle agglomeration
Solution Approach 1:
The patent uses a composite structure of Cu substrate with vertically grown Cu(OH)2 microrods, which are then coated with TiO2 and decorated with Pt nanoparticles. This multi-component composite architecture prevents Pt agglomeration through the hierarchical structure while maintaining high HER activity through synergistic effects between components.
Solution Approach 2:
The patent transitions from 2D Pt/C catalyst to a 3D hierarchical structure with vertically oriented Cu(OH)2 microrods coated with TiO2 and Pt nanoparticles. This dimensional change provides more space for Pt dispersion and prevents agglomeration while increasing active sites for HER.
2Productivity
If Pt/C catalyst is used under high current conditions, then hydrogen production increases, but bubble build-up effect reduces efficiency
Solution Approach 1:
The patent employs porous TiO2 coating on Cu(OH)2 microrods with controlled porosity (30-70% void space). This porous structure facilitates efficient hydrogen bubble detachment and mass transport, preventing bubble build-up effect while maintaining high hydrogen production rates and energy efficiency.
3Ease of operation
If Pt/C catalyst is immobilized on substrate with binders, then catalyst is fixed on current collector, but binders reduce active sites and lower HER efficiency
Solution Approach 1:
The patent removes the binder component entirely from the catalyst structure. Instead of using binder-based immobilization, Pt nanoparticles are directly grown on TiO2-coated Cu(OH)2 microrods, which are vertically anchored on the current collector. This extraction of the harmful binder element eliminates the trade-off between immobilization and HER efficiency.
4Productivity
If Pt/C catalyst is used, then hydrogen evolution occurs, but vigorous bubble evolution causes catalyst detachment from substrate
Solution Approach 1:
The patent uses vertically oriented 3D microrod structures instead of 2D flat catalyst layers. This vertical architecture allows hydrogen bubbles to escape upward along the microrod surfaces, reducing mechanical stress on the catalyst-substrate interface and preventing detachment during vigorous hydrogen evolution.
5Quantity of substance
If noble metal loading is reduced to minimize cost, then catalyst cost decreases, but catalytic activity is insufficient
Solution Approach 1:
The patent concentrates Pt nanoparticles specifically at the tips and surfaces of TiO2-coated Cu(OH)2 microrods where electrochemical reactions occur most actively. This localized distribution of noble metal maximizes catalytic activity per unit mass of Pt, allowing reduced overall loading while maintaining high HER performance.
Data Source
Figure 1~2(e)
Figure 3~4(f)
Figure 5(a)~5(d)
AI summary
The present invention relates to an electrocatalyst comprising a Cu substrate coated with a 3D TiO2/Cu microrods array decorated with nanoparticles of a noble metal, preferably Ru nanoparticles, an electrochemical cell comprising said electrocatalyst and their use for hydrogen production via hydrogen evolution reaction (HER) in basic conditions. The present invention also refers to an in-situ process for the preparation of said electrocatalyst and simultaneous production of hydrogen. The present invention also refers to a process for producing hydrogen which utilizes the electrochemical cell comprising the electrocatalyst according to the invention.