Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 7, Issue 21, Pages 18085-18092Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.9b05126
Keywords
Water splitting; Bifunctional electrocatalyst; Cocrystals; Supramolecular materials; Intrinsic activity
Categories
Funding
- National Natural Science Foundation of China [21771021, 21720303, 21822501]
- Beijing Nova Program [xx2018115]
- Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology [BM2012110]
- Analytical and Measurements Fund of Beijing Normal University
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Electrochemical water splitting to produce hydrogen can meet growing energy needs while balancing the impact of severe fossil fuel consumption. To date, it is still greatly desirable to obtain bifunctional and precious metal-free electrocatalysts for the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) simultaneously during overall water splitting toward actual applications. Herein, we develop a cocrystallized strategy to obtain a Co/Ni-based mixed metal-organic nanosheet array (NiCo-9AC-AD) on a nickel foam (NF) substrate with controlled composition and morphology as a bifunctional electrocatalyst. The optimized Ni0.3Co0.7-9AC-AD/NF reveals efficient electrocatalytical activity and very low overpotentials of 350 mV for OER to attain a current density value of 100 mA cm(-2) and 143 mV for HER at 10 mA cm(-2). This is due to the synergistic effect of Ni/Co double catalytical active sites and ultrathin 2D nanosheet topology. More importantly, as an exceptionally active and stable electrocatalyst, the NiCo-9AC-AD nanosheet array requires merely 1.56 V to deliver a current density value of 10 mA cm(-2) in an overall water-splitting application. This work thus develops a simple approach to obtain a highly active cocrystallized metal-organic hybrid for both OER and HER, which may open the way to rational design of similar Ni/Co-based supramolecular systems toward electrochemical and energy storage applications.
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