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Hydroxyapatite-Derived Heterogeneous Ru-Ru2 P Electrocatalyst and Environmentally-Friendly Membrane Electrode toward
Qingquan Yu1, Wanqiang Yu1, Yujie Wang1
1Institute for Advanced Interdisciplinary Research (iAIR), School of Chemistry and Chemical Engineering, University of Jinan, Jinan, 250022, P. R. China.
Small (Weinheim an Der Bergstrasse, Germany)
|March 17, 2023
Summary
Researchers developed a novel Ru-Ru2P catalyst using a green phosphating method for efficient alkaline membrane water electrolysis. This catalyst demonstrates excellent hydrogen evolution reaction performance and stability, paving the way for industrial hydrogen production.
Area of Science:
- Materials Science
- Electrochemistry
- Catalysis
Background:
- Alkaline membrane water electrolysis is crucial for sustainable hydrogen production.
- Developing efficient electrocatalysts and membrane electrode assemblies is key to advancing this technology.
Purpose of the Study:
- To fabricate a highly active and stable electrocatalyst for the hydrogen evolution reaction (HER) using an environmentally friendly approach.
- To design and test an efficient alkaline membrane electrode assembly for overall water splitting.
Main Methods:
- Synthesized Ru-Ru2P heterogeneous nanoparticles via ion-exchange and in situ green phosphating using hydroxyapatite (HAP).
- Employed Density Functional Theory (DFT) calculations to understand the electronic structure at the Ru-Ru2P heterointerface.
- Constructed a membrane electrode assembly using HAP as the alkaline membrane, Ru-Ru2P as the cathode catalyst, and NiFe-LDH as the anode catalyst.
Main Results:
- The Ru-Ru2P catalyst exhibited outstanding HER performance (24 mV at 10 mA cm-2) and remarkable stability (1000 mA cm-2 for 120 h) in alkaline media.
- DFT calculations revealed electronic redistribution at the heterointerface, optimizing hydrogen adsorption.
- The assembled electrolyzer showed a lower voltage (1.53 V at 10 mA cm-2) for overall water splitting compared to a Pt/C-RuO2 system.
Conclusions:
- The novel Ru-Ru2P catalyst offers a promising alternative for efficient and stable hydrogen evolution.
- The developed membrane electrode assembly demonstrates potential for industrial-scale hydrogen production.
- This study presents a new strategy for designing high-performance electrolyzers using green chemistry principles.
