Details

Autor(en) / Beteiligte

• Yao, Rui
• Sun, Kaian
• Zhang, Kaiyang
• Wu, Yun
• Du, Yujie
• Zhao, Qiang
• Liu, Guang
• Chen, Chen
• Sun, Yuhan
• Li, Jinping

Titel

Stable hydrogen evolution reaction at high current densities via designing the Ni single atoms and Ru nanoparticles linked by carbon bridges

Ist Teil von

• Nature communications, 2024-03, Vol.15 (1), p.2218-2218, Article 2218

Ort / Verlag

England: Nature Publishing Group

Erscheinungsjahr

2024

Quelle

Elektronische Zeitschriftenbibliothek - Freely accessible e-journals

Beschreibungen/Notizen

• Continuous and effective hydrogen evolution under high current densities remains a challenge for water electrolysis owing to the rapid performance degradation under continuous large-current operation. In this study, theoretical calculations, operando Raman spectroscopy, and CO stripping experiments confirm that Ru nanocrystals have a high resistance against deactivation because of the synergistic adsorption of OH intermediates (OH ) on the Ru and single atoms. Based on this conceptual model, we design the Ni single atoms modifying ultra-small Ru nanoparticle with defect carbon bridging structure (UP-RuNi /C) via a unique unipolar pulse electrodeposition (UPED) strategy. As a result, the UP-RuNi /C is found capable of running steadily for 100 h at 3 A cm , and shows a low overpotential of 9 mV at a current density of 10 mA cm under alkaline conditions. Moreover, the UP-RuNi /C allows an anion exchange membrane (AEM) electrolyzer to operate stably at 1.95 V for 250 h at 1 A cm .