Ultra-small porous WN/W2C nanoparticles for sustained hydrogen production by a polyoxometalate-intercalated pyrolysis strategy. (28th November 2022)

• Record Type: Journal Article
• Authors: Zhu, Ying; Zheng, Haiyan; Liu, Xinyan; Sun, Chunyi; Dong, Man; Wang, Xinlong; Su, Zhongmin
• Is Part Of: New journal of chemistry. Volume 46:Number 48(2022)
• Page Start: 23292
• Page End: 23296
• Publication Date: 2022-11-28
• Subjects: Chemistry -- Periodicals; Chimie -- Périodiques; 540
• DOI: 10.1039/d2nj04218e
• Languages: English
• ISSNs: 1144-0546

Abstract

Abstract : Designing low-cost, stable and earth-abundant transition metal-based electrocatalysts to replace Pt-based catalysts is of significant importance for green and sustainable energy technologies. Abstract : Designing low-cost, stable and earth-abundant transition metal-based electrocatalysts to replace Pt-based catalysts is of significant importance for green and sustainable energy technologies. W-based carbon materials are crucial hydrogen evolution reaction (HER) electrocatalysts, but the synthesis and stability of such materials still face great challenges that hamper the development of such applications. Herein, WN/W2 C porous composites with a carbon shell (WN/W2 C@PC) were prepared by forming a pyrolytic polyoxometalate-intercalated layered double hydroxide (LDH) with glucose and NH4 Cl as templates. The composites possess a high specific surface area of 633.74 m 2 g −1, which offers more active sites and promotes the HER performance. Compared with most non-precious metal-based electrocatalysts, WN/W2 C@PC undergoes an outstanding HER with a low overpotential of 121.3 mV and 91 mV at 10 mA cm −2 under 0.5 M H2 SO4 and 1 M KOH, respectively, and exhibits robust long-term stability. This work provides novel insights for the rational design and preparation of efficient non-precious metal-based HER electrocatalysts.