Cu(I) complex based on 6H-indolo[2,3-b]quinoxaline: structure and electrocatalytic properties for hydrogen evolution reaction from water

Pan Zhang; Xin Yang; Penggang Jiang; Junli Yin; Yun Gong; Jianhua Lin

doi:10.1039/C5RA02769A

Cu(i) complex based on 6H-indolo[2,3-b]quinoxaline: structure and electrocatalytic properties for hydrogen evolution reaction from water†

Pan Zhang,^a Xin Yang,^b Penggang Jiang,^a Junli Yin,^a Yun Gong*^a and Jianhua Lin*^ac

* Corresponding authors

^a Department of Applied Chemistry, College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400030, P. R. China
E-mail: gongyun7211@cqu.edu.cn
Tel: +86-023-65106150

^b Chongqing Foreign Language School, Chongqing 400039, P. R. China

^c State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. China
E-mail: jhlin@pku.edu.cn, jhlin@cqu.edu.cn
Tel: +86-010-62753541

Abstract

Using a rigid ligand, 6H-indolo[2,3-b]quinoxaline (HL), a Cu(I) complex formulated as Cu₂L₂ (1) has been solvothermally synthesized and structurally characterized by single-crystal X-ray diffraction. The complex is a planar Cu₂ dimer, in which two Cu(I) ions are linked by two L⁻ with a Cu⋯Cu separation of 2.637 Å. And different Cu₂ units are connected by strong π–π stacking interactions into a three-dimensional (3D) supramolecular architecture. The HL ligand can't electrocatalyze the hydrogen evolution reaction (HER) from water, whereas the Cu(I) complex can act as an electrochemically stable electrocatalyst. In the presence of the Cu(I) complex, the exchanging current density i₀ for the HER is improved. And with the increase of the temperature, the HER current density is increased, and the average activation energy E_a from 30 to 50 °C for the HER in the presence of the complex is calculated as ca. 40 kJ mol⁻¹.

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DOI: https://doi.org/10.1039/C5RA02769A
Article type: Paper
Submitted: 12 Feb 2015
Accepted: 07 Apr 2015
First published: 07 Apr 2015

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RSC Adv., 2015,5, 34058-34064

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Cu(I) complex based on 6H-indolo[2,3-b]quinoxaline: structure and electrocatalytic properties for hydrogen evolution reaction from water

P. Zhang, X. Yang, P. Jiang, J. Yin, Y. Gong and J. Lin, RSC Adv., 2015, 5, 34058 DOI: 10.1039/C5RA02769A

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Cu(i) complex based on 6H-indolo[2,3-b]quinoxaline: structure and electrocatalytic properties for hydrogen evolution reaction from water†

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Cu(I) complex based on 6H-indolo[2,3-b]quinoxaline: structure and electrocatalytic properties for hydrogen evolution reaction from water

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