# Electrochemical deposition of mesoporous high-entropy Pt–Pd–Rh–Ru–Cu–Au–Se–Mo films using polymeric micelle templating

## TL;DR

A new eco-friendly method creates a complex metal alloy with high performance for energy applications.

## Contribution

The first room-temperature synthesis of an eight-element mesoporous high-entropy alloy with record entropy.

## Key findings

- The alloy contains Pt, Pd, Rh, Ru, Cu, Au, Se, and Mo with entropy >1.95R.
- Mesoporous structure improves catalytic activity and mass transport.
- Synthesis avoids harsh conditions and toxic solvents.

## Abstract

Platinum (Pt)-based high-entropy alloys (HEAs) can optimize catalytic properties through multi-element synergy, yet conventional synthesis requires harsh conditions such as high temperature/pressure or toxic solvents, limiting sustainable applications. Here, we report the synthesis of a mesoporous high-entropy alloy composed of Pt, Pd, Rh, Ru, Cu, Au, Se, and Mo using a micelle soft-templating method by electrochemical deposition. The effects of electrodeposition potentials on entropy changes and element content are explored. The typical eight-element HEA exhibits the highest entropy value (>1.95R) among reported mesoporous HEAs to date. The mesoporous architecture enhances active sites and mass transport, offering an eco-friendly platform for advanced catalytic materials in energy conversion and storage.

A mesoporous high-entropy alloy film (Pt, Pd, Rh, Ru, Cu, Au, Se, Mo) is synthesized via soft-templated electrochemical deposition at room temperature, achieving the highest entropy value reported for mesoporous metals to date.