Three-dimensional tetsubo-like Co(OH)2 nanorods on a macroporous electrically conductive network as an efficient electroactive framework for the hydrogen evolution reaction

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Xin Tong
  • Dajun Wu
  • Chi Zhang
  • Kenan Lian
  • Dayuan Xiong
  • Shaohui Xu
  • Yiping Zhu
  • Ruijuan Qi
  • Rong Huang
  • Lianwei Wang

Detail(s)

Original languageEnglish
Pages (from-to)2629-2639
Journal / PublicationJournal of Materials Chemistry A
Volume5
Issue number6
Publication statusPublished - 2017

Abstract

Conducting the hydrogen evolution reaction (HER) in an alkaline environment using a non-precious transition metal catalyst with high efficiency is challenging. Here, we report excellent HER activity achieved using three-dimensional (3D) tetsubo-like Co(OH)2 nanorods on a macroporous electrically conductive network (MECN) synthesized by a hydrothermal method. This unique framework comprises three levels of porous structures, including a bottom-ordered MECN substrate, an intermediate layer of vertically porous Co(OH)2 nanowires with a mean diameter of 100 nm and length of about 2 μm, and outmost Co(OH)2 nanosheets (≈20 nm). The 3D array structure with a large aspect ratio provides a large specific surface area and exposes more active sites to catalyze electrochemical reactions at the electrode-electrolyte interface. Compared with Co(OH)2 nanosheets on an MECN and foamy Co(OH)2 on an MECN structure, the synthesized architecture has excellent HER catalytic reactivity, including a low potential of −69.2 mV vs. RHE, a cathodic current density of 10 mA cm−2, a small Tafel slope of 61.9 mV dec−1, a high current density, and robust catalytic stability in 1 M KOH, and is promising in HER applications.

Citation Format(s)

Three-dimensional tetsubo-like Co(OH)2 nanorods on a macroporous electrically conductive network as an efficient electroactive framework for the hydrogen evolution reaction. / Tong, Xin; Wu, Dajun; Zhang, Chi; Lian, Kenan; Xiong, Dayuan; Xu, Shaohui; Zhu, Yiping; Qi, Ruijuan; Huang, Rong; Wang, Lianwei; Chu, Paul K.

In: Journal of Materials Chemistry A, Vol. 5, No. 6, 2017, p. 2629-2639.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review