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Updated: Jun 24, 2025

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Published on: July 28, 2018

Lanthanide-regulating Ru-O covalency optimizes acidic oxygen evolution electrocatalysis.

Lu Li¹, Gengwei Zhang², Chenhui Zhou¹

¹School of Materials Science and Engineering, Peking University, Beijing, China.

Nature Communications

|June 11, 2024

Summary

This summary is machine-generated.

Lanthanide doping precisely modulates ruthenium oxide (RuO_x) covalency, significantly enhancing stability for proton exchange membrane water electrolysis. Erbium-doped RuO_x (Er-RuO_x) demonstrates superior durability and catalytic performance.

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Synthesis of Metal Nanoparticles Supported on Carbon Nanotube with Doped Co and N Atoms and its Catalytic Applications in Hydrogen Production

Published on: December 6, 2021

Area of Science:

Materials Science
Electrochemistry
Catalysis

Background:

Precise control over Ru-O covalency in RuO_x is crucial for improving stability in proton exchange membrane water electrolysis.
Doping or alloying RuO_x with traditional transition metals offers limited control over covalency due to environmental sensitivity.

Purpose of the Study:

To investigate the use of lanthanides for continuous and precise modulation of Ru-O covalency in RuO_x catalysts.
To identify optimal lanthanide-doped RuO_x (Ln-RuO_x) catalysts for enhanced stability in water electrolysis.

Main Methods:

Theoretical calculations were employed to understand the relationship between lanthanide doping and Ru-O covalency.
Systematic evaluation of various Ln-RuO_x catalysts to determine their durability trends.
Electrochemical testing of the optimal Er-RuO_x catalyst under demanding water electrolysis conditions.

Main Results:

Lanthanide introduction enables continuous tuning of Ru-O covalency via the shielding effect of 5s/5p orbitals.
Catalyst durability exhibits a volcanic trend correlated with Ru-O covalency.
Erbium-doped RuO_x (Er-RuO_x) emerged as the optimal catalyst, showing 35.5 times higher stability than RuO₂.
The Er-RuO_x catalyst achieved high current density at a low voltage (1.837 V for 3 A cm^-2) and demonstrated exceptional long-term stability (100 h at 500 mA cm^-2 with 37 μV h^-1 degradation).

Conclusions:

Lanthanide doping provides an effective strategy for precise and continuous modulation of Ru-O covalency in RuO_x.
Er-RuO_x represents a highly stable and efficient catalyst for proton exchange membrane water electrolysis.
This work offers a new avenue for designing advanced electrocatalysts for clean energy applications.