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Updated: Apr 28, 2026

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Published on: November 7, 2025
Spatially Segregated Pt/Co Dual Single-Atoms on Janus MXene Synergistically Boost Electrocatalytic Overall Water
Jian Zhang1, Luxin Zhang1, Boya Zhao1
1State Key Laboratory of Organic Electronics and Information Displays and Institute of Advanced Materials (IAM), New Energy Technology Engineering Lab of Jiangsu Province, Nanjing University of Posts and Telecommunications (NUPT), Nanjing, Jiangsu 210023, P. R. China.
Abstract:
Spatial precision in the organization of active sites enables high-performance bifunctional electrocatalysts for overall water splitting. Herein, a stepwise defect-induced in situ intercalation strategy is developed to anchor Pt and Co single atoms on the two opposing facets of Ti3C2Ty MXene, respectively, realizing separate-sided functionalization of monolayer Ti3C2Ty with Pt/Co dual single atoms (Pt/Co DSA-Ti3-xC2Ty). The fabricated Janus Pt/Co DSA-Ti3-xC2Ty exhibits superior bifunctional electrocatalytic performance in an alkaline electrolyte, originating from the distinct roles of the two facets: Pt SAs on one side drive the HER (20.0 mV @ 10 mA cm-2), whereas Co single atoms on the other side deliver the impressive OER performance (195.0 mV @ 10 mA cm-2). The Janus electrocatalyst exhibits an ultralow overall water splitting overpotential of only 1.45 V to achieve 10 mA cm-2. Additionally, as bifunctional electrodes in AEMWE, Pt/Co DSA-Ti3-xC2Ty demonstrates a low voltage of 1.81 V at 1.0 A cm-2 with a 200 h stability. In situ/operando spectroscopy and DFT calculations unveil that Pt/Co DSAs synergistically induce charge redistribution on the MXene surface, thus optimizing the active-site electronic states and intermediate adsorption to lower the reaction energy barrier. Our strategy serves as a pathway for atomically precise control of MXene-supported single-atom sites toward selective electrocatalysis.
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