Subnanometric Pt–W Bimetallic Clusters for Efficient Alkaline Hydrogen Evolution Electrocatalysis

作者：Shoushun Chen, Cong Ma, Jiabin Xu, Xin Du, Yuzhen Liu, Tsun‐Kong Sham, Hong Zhang, Yong Peng, Yining Huang, Thomas Wågberg, Xin‐Bao Han · 发表于：ACS Nano · 年份：2024 · DOI：10.1021/acsnano.4c13743 · 被引用次数：35 · 研究领域：Nanocluster Synthesis and Applications、Electrocatalysts for Energy Conversion、Advanced Nanomaterials in Catalysis

Rational design and synthesis of subnanometric bimetallic clusters (SBCs) within a narrow size distribution, along with achieving full SBCs exposure on supporting materials, are formidable challenges that must be overcome to realize potential applications. This work details a facile strategy to synthesize fully exposed PtW SBCs with an average size of 0.81 nm on the surface of spherical N-doped carbon (PtW/NC), which is underpinned by the electrostatic interactions between the negatively charged [H 3 PtW 6 O 24 ] 5– polyanions and the positively charged closed-pore metal–organic framework (MOF) [Zn 5 (OH) 2 (AmTRZ) 6 ] 2+ . The PtW/NC exhibits significant electrocatalytic performance and stability for the alkaline hydrogen evolution reaction with an ultralow overpotential of 4 mV at 10 mA cm –2, a low Tafel slope of 29 mV dec –1, and a long-term electrolysis stability exceeding 140 h. The Pt mass activity of PtW/NC is 34 times higher than that of commercial 20 wt % Pt/C at the 100 mV overpotential. Both theoretical calculations and electrochemical measurements indicate that a synergistic effect between Pt and W is responsible for this notable catalytic performance. The synthetic approach outlined in this work can be applied to other MOFs and coordination networks that lack pores or have limited porosity.