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Issue 22, 2018
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Metal–organic framework-derived Zn0.975Co0.025S/CoS2 embedded in N,S-codoped carbon nanotube/nanopolyhedra as an efficient electrocatalyst for overall water splitting

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Abstract

The development of high-efficiency, low-cost and stable bifunctional electrocatalysts for both the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) is extremely crucial to promote sustainable energy technologies, yet remains a long and arduous challenge. In this work, Zn and Co bimetallic zeolitic imidazolate framework (ZnCo-ZIF) templates were used to synthesize Zn0.975Co0.025S/CoS2 nanoparticles embedded in N,S-codoped carbon nanotube/nanopolyhedra (ZnCoS-NSCNT/NP) via a facile two-step method. Benefitting from the synergetic effect of two metal sulfide species, mesoporous polyhedral structure, N,S-codoped carbon matrix and deep-rooted CNT networks, the product exhibits excellent catalytic performance for both the HER and OER in 1 M KOH, affording a low overpotential of 270 mV for the OER and 152 mV for the HER at a current density of 10 mA cm−2. More importantly, by utilizing ZnCoS-NSCNT/NP as the electrocatalyst for both the cathode and anode in an electrolyzer for overall water splitting, a current density of 10 mA cm−2 at 1.59 V and long-term durability (40 h) were achieved. This work opened a new possibility for exploring non-precious-metal catalysts for overall water splitting.

Graphical abstract: Metal–organic framework-derived Zn0.975Co0.025S/CoS2 embedded in N,S-codoped carbon nanotube/nanopolyhedra as an efficient electrocatalyst for overall water splitting

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Publication details

The article was received on 08 Feb 2018, accepted on 28 Apr 2018 and first published on 01 May 2018


Article type: Paper
DOI: 10.1039/C8TA01370E
Citation: J. Mater. Chem. A, 2018,6, 10441-10446
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    Metal–organic framework-derived Zn0.975Co0.025S/CoS2 embedded in N,S-codoped carbon nanotube/nanopolyhedra as an efficient electrocatalyst for overall water splitting

    Z. Yu, Y. Bai, S. Zhang, Y. Liu, N. Zhang and K. Sun, J. Mater. Chem. A, 2018, 6, 10441
    DOI: 10.1039/C8TA01370E

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