Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 6, Issue 22, Pages 10441-10446Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8ta01370e
Keywords
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Funding
- National Natural Science Foundation of China [51203036]
- Beijing Institute of Technology Research Fund Program for Young Scholars
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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.
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