A 3D porous WP<sub>2</sub> nanosheets@carbon cloth flexible electrode for efficient electrocatalytic hydrogen evolution

doi:10.1007/s11705-018-1726-7

Front. Chem. Sci. Eng.

2018, Vol. 12

Issue (3) : 425-432 https://doi.org/10.1007/s11705-018-1726-7

RESEARCH ARTICLE

A 3D porous WP₂ nanosheets@carbon cloth flexible electrode for efficient electrocatalytic hydrogen evolution

Mingyu Pi¹, Xiaodeng Wang¹, Dingke Zhang², Shuxia Wang¹, Shijian Chen¹(

)

¹. College of Physics, Chongqing University, Chongqing 401331, China
². College of Physics and Electronic Engineering, Chongqing Normal University, Chongqing 401331, China

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Abstract

Self-standing porous WP₂ nanosheet arrays on carbon fiber cloth (WP₂ NSs/CC) were synthesized and used as a 3D flexible hydrogen evolution electrode. Because of its 3D porous nanoarray structure, the WP₂ NSs/CC exhibits a remarkable catalytic activity and a high stability. By using the experimental measurements and first-principle calculations, the underlying reasons for the excellent catalytic activity were further explored. Our work makes the present WP₂ NSs as a promising electrocatalyst for hydrogen evolution and provides a way to design and fabricate efficient hydrogen evolution electrodes through 3D porous nano-arrays architecture.

Keywords WP₂ nanosheet arrays hydrogen evolution electrocatalyst flexible electrode

Corresponding Author(s): Shijian Chen

Just Accepted Date: 26 March 2018 Online First Date: 25 July 2018 Issue Date: 18 September 2018

Cite this article:

Mingyu Pi,Xiaodeng Wang,Dingke Zhang, et al. A 3D porous WP₂ nanosheets@carbon cloth flexible electrode for efficient electrocatalytic hydrogen evolution[J]. Front. Chem. Sci. Eng., 2018, 12(3): 425-432.

URL:

https://academic.hep.com.cn/fcse/EN/10.1007/s11705-018-1726-7
https://academic.hep.com.cn/fcse/EN/Y2018/V12/I3/425

Fig.1 (a) Schematic diagram of the preparation for WP₂ NSs/CC; (b) crystal structure of WP₂ (W: gray sphere, P: purple sphere); (c) XRD data for bare CC, WO₃ NSs/CC and WP₂ NSs/CC

Fig.2 SEM images for (a, c) WO₃ NSs/CC and (b, d) WP₂ NSs/CC

Fig.3 (a) TEM and (b) HR-TEM images for WP₂ NSs; (c–f) EDX elemental mappings for WP₂ NSs

Fig.4 (a) Polarization curves for WP₂ NSs/CC, WP₂ NPs/CC, bare CC and commercial Pt/C, and (b) the corresponding Tafel plots; (c) polarization curves for WP₂ NSs/CC initial and after 1000 CV scanning; (d) the current density vs. time curve for WP₂ NSs/CC at constant potential of 135 mV (vs. RHE) for 60 h

Fig.5 (a) Microcosmic reaction mechanism of hydrogen evolution on the surface of WP₂ NSs/CC; (b) schematic depictions of WP₂ nanosheets and nanoparticles bursting larger H₂ bubbles that usually pin at the film surface, and the WP₂ nanosheets can wick the formed hydrogen bubbles and maintain the catalyst-electrolyte interface effectively

Fig.6 Nyquist plots and data fitting to a simplified circuit for WP₂ NSs/CC and WP₂ NPs/CC

Tab.1 Fitted data value of Rs, Rct and CPE for the WP₂ NSs/CC and WP₂ NPs/CC

Fig.7 Energy barrier for H atom adsorption on the surface of Pt, WP₂, MoP₂, MoP, MoS₂/CoSe₂, Co-FeS₂/CNT and FeS₂/CNT catalysts

Fig.8 Hydrogen evolution process diagram for the WP₂ NSs/CC

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