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Hydrogen Production and Utilization in a Membrane Reactor

Hydrogen Production and Utilization in a Membrane Reactor

Published on: March 10, 2023

Bifunctional Pd@RhPd Core-Shell Nanodendrites for Methanol Electrolysis.

Yu-Chuan Jiang¹, Hui-Ying Sun¹, Ya-Nan Li¹

¹Key Laboratory of Macromolecular Science of Shaanxi Province, Key Laboratory of Applied Surface and Colloid Chemistry (Ministry of Education), Shaanxi Key Laboratory for Advanced Energy Devices, School of Materials Science and Engineering, Shaanxi Normal University, Xi'an 710062, People's Republic of China.

ACS Applied Materials & Interfaces

|July 26, 2021

Summary

Advanced electrocatalysts made of palladium core and rhodium-palladium alloy shell nanodendrites efficiently produce hydrogen via methanol electrolysis. These bifunctional catalysts offer lower energy consumption compared to water electrolysis for hydrogen generation.

Keywords:

core−shell structure galvanic replacement reaction hydrogen evolution reaction methanol electrolysis methanol oxidation reaction

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Area of Science:

Electrochemistry
Materials Science
Renewable Energy

Background:

Methanol electrolysis offers an energy-saving route for hydrogen production.
Advanced electrocatalysts are crucial for efficient methanol oxidation (MOR) and hydrogen evolution (HER).
Rhodium (Rh) and palladium (Pd) possess complementary catalytic properties for MOR and HER.

Purpose of the Study:

To synthesize and evaluate palladium core-RhPd alloy shell nanodendrites (Pd@RhPd NDs) as bifunctional electrocatalysts.
To investigate the influence of Rh content on catalytic activity for MOR and HER.
To demonstrate the efficiency of Pd@RhPd NDs in a methanol electrolysis system.

Main Methods:

Synthesis of Pd@RhPd NDs via galvanic replacement reaction.
Electrocatalytic performance testing for MOR and HER.
Fabrication and testing of a two-electrode methanol electrolysis cell.

Main Results:

Pd@RhPd NDs exhibited enhanced catalytic activity for both MOR and HER.
Optimal MOR activity was observed for Pd@Rh$_{0.07}$Pd NDs due to synergistic Pd/Rh active sites.
Rh introduction significantly improved HER activity, with activity less sensitive to Rh content.
The methanol electrolysis cell achieved H$_{2}$ production at a lower voltage (0.813 V) compared to water electrolysis.

Conclusions:

Pd@RhPd NDs are effective bifunctional electrocatalysts for methanol electrolysis.
Methanol electrolysis using these catalysts presents a promising, energy-efficient pathway for hydrogen production.