Issue 10, 2024

Tailoring cobalt spinel oxide with site-specific single atom incorporation for high-performance electrocatalysis

Abstract

Universal incorporation of metals into cobalt spinel oxide (CSO) has emerged as a versatile and promising strategy to enhance catalytic performance. However, the uncontrolled reactivity of early transition metal and metalloid precursors with water has presented a significant challenge in achieving atomic-scale metal incorporation within CSO. This study presents a groundbreaking approach for the atomic-scale integration of diverse dopants, including Hf, Ta, W, Ti, Pd, Ga, and Ge, while elucidating the atomic stabilization sites for these metal cations within CSO. Notably, certain metals, such as Ta, W, and Ge exhibit greater stability at the surface rather than within the core of CSO, resulting in a Co2+-enriched surface that serves as a both catalytically active and protective shell. Exploiting these remarkable features, Ta-doped Co3O4 demonstrates the lowest overpotential, registering a mere 378 mV at 10 mA cm−2, while maintaining its catalytic activity for over 140 hours in acidic electrolyte.

Graphical abstract: Tailoring cobalt spinel oxide with site-specific single atom incorporation for high-performance electrocatalysis

Supplementary files

Article information

Article type
Paper
Submitted
05 ene. 2024
Accepted
15 abr. 2024
First published
25 abr. 2024
This article is Open Access
Creative Commons BY-NC license

Energy Environ. Sci., 2024,17, 3618-3628

Tailoring cobalt spinel oxide with site-specific single atom incorporation for high-performance electrocatalysis

K. Lee, J. Shim, H. Ji, J. Kim, H. S. Lee, H. Shin, M. S. Bootharaju, K. Lee, W. Ko, J. Lee, K. Kim, S. Yoo, S. Heo, J. Ryu, S. Back, B. Lee, Y. Sung and T. Hyeon, Energy Environ. Sci., 2024, 17, 3618 DOI: 10.1039/D4EE00058G

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