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Diffraction anomalous fine structure pinpoints electrochemically active sites in robust heterojunctions.

Pengjun Zhang¹, Guikai Zhang², Ruijie Wang¹

¹National Synchrotron Radiation Laboratory, State Key Laboratory of Precision and Intelligent Chemistry, School of Nuclear Science and Technology, University of Science and Technology of China, Hefei 230029, Anhui, China.

Science Advances

|July 1, 2026

Summary

This summary is machine-generated.

Researchers developed a stable Nb4CuC3/Nb4C3Tx heterostructure for lithium-ion batteries. This material shows excellent cycling stability, with active sites identified on the Nb4C3Tx surface for improved energy storage.

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All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics

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Published on: January 19, 2018

Area of Science:

Materials Science
Electrochemistry
Nanotechnology

Background:

Identical metallic element heterojunctions offer advantages like lattice-matching and low interfacial resistance for electrochemical applications.
Challenges exist in constructing robust heterojunctions and understanding their site chemistry.

Purpose of the Study:

To present a durable Nb4CuC3/Nb4C3Tx heterostructure for lithium-ion batteries.
To identify the electrochemically active sites within the heterostructure.

Main Methods:

Synchrotron radiation core-level spectroscopy
Scanning transmission electron microscopy
Site-selective X-ray analysis (diffraction anomalous fine structure)

Main Results:

The Nb4CuC3/Nb4C3Tx heterostructure demonstrated exceptional cycling stability over 10,000 cycles with minimal capacity degradation.
Four distinct niobium coordination environments were resolved.
NbI sites on the Nb4C3Tx surface were identified as the active centers.

Conclusions:

The Nb4CuC3 component acts as a structural buffer, enhancing durability.
A methodological platform was established for identifying active sites in complex electrochemical systems.
This facilitates rational design for high-performance energy storage devices.