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Issue 4, 2018
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Self-assembled pearl-bracelet-like CoSe2–SnSe2/CNT hollow architecture as highly efficient electrocatalysts for hydrogen evolution reaction

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Abstract

For the first time, self-assembled pearl-bracelet-like CoSe2–SnSe2/CNT hollow nanoboxes (CSCB), as a novel non-precious electrocatalyst for hydrogen evolution reaction (HER), have been synthesized by a facile aqueous reaction and selenization processes. Compared to bare CoSe2–SnSe2 nanoboxes (CSB), the CSCB hybrid shows much faster kinetics and far better HER performance: the HER mechanism of CSCB is improved to be a Volmer–Tafel combination, instead of Volmer–Heyrovsky combination (as in case of CSB); the Tafel slope of CSCB dramatically decreases from 74.5 mV dec−1 (for CSB) to 32.4 mV dec−1, which nearly approaches to that of the commercial Pt/C electrocatalyst; the CSCB hybrid delivers a very large current density of 35 mA cm−2 at −250 mV vs. RHE, over 85 times larger than that of CSB (0.4 mA cm−2). Furthermore, CSCB shows an excellent long-term electrocatalytic stability even after 1500 cycles. The superior HER performances of CSCB can be attributed to its well-designed pearl-bracelet-like hollow architecture with high conductivity and rich porosity: the CNT chains with a good mechanical strength and high conductivity construct a highly conductive network for fast charge transportation during HER; the hollow CoSe2–SnSe2 nanoboxes with large internal voids and rich nano-/mesopores provide abundant catalytic active sites and facilitate ion-diffusion. This study provides insight into a rational design and low-cost synthesis of the non-precious transition-metal chalcogenide-based electrocatalysts with high efficiency and stability for HER.

Graphical abstract: Self-assembled pearl-bracelet-like CoSe2–SnSe2/CNT hollow architecture as highly efficient electrocatalysts for hydrogen evolution reaction

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Publication details

The article was received on 11 Oct 2017, accepted on 21 Dec 2017 and first published on 21 Dec 2017


Article type: Paper
DOI: 10.1039/C7TA08955D
Citation: J. Mater. Chem. A, 2018,6, 1655-1662
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    Self-assembled pearl-bracelet-like CoSe2–SnSe2/CNT hollow architecture as highly efficient electrocatalysts for hydrogen evolution reaction

    B. Yu, F. Qi, B. Zheng, W. Hou, W. Zhang, Y. Li and Y. Chen, J. Mater. Chem. A, 2018, 6, 1655
    DOI: 10.1039/C7TA08955D

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