Journal
CHEMICAL ENGINEERING JOURNAL
Volume 423, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.130313
Keywords
Cobalt quantum dots; Oxygen reduction reaction; Oxygen evolution reaction; Hydrogen evolution reaction; Zn-air battery; Overall water splitting
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Funding
- National Natural Science Foundation of China (NSFC) [51702176, 51572133, 51972178]
- Zhejiang Provincial Nature Science Foundation [LY20E020009]
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In this study, a facile method was reported to fabricate highly efficient hybrid catalyst Co@NCL, consisting of highly dispersed Co quantum dots and N-doped carbon layers. The hybrid catalyst exhibited excellent trifunctional electrocatalytic activities in alkaline media and demonstrated promising applications in zinc-air batteries and water electrolyzers with high performance and long-term stability.
Hybrid electrocatalysts with stable two-dimensional (2D) framework and fine sub-structures are of great interest for enhancing the mass/electron transport and accessibility of maximized active sites. Here, we report a facile 2D-ZIF transformation strategy for fabricating highly efficient hybrid catalysts composed of highly dispersed Co quantum dots (-4.57 nm in diameter) embedded in ultrathin N-doped carbon layers (-3 nm in thickness), denoted as Co@NCL. The as-fabricated hybrids have excellent overall trifunctional electrocatalytic activities toward oxygen reduction (half-wave potential (E1/2) = 0.84 V), oxygen evolution (potential at 10 mA cm-2 (Ej10) = 1.63 V), and hydrogen evolution (Ej10 = -0.22 V) reactions in alkaline media. Notably, its reversible oxygen electrode index (Delta E = Ej10 - E1/2 = 0.79 V) is comparable with that of benchmarked noble-metal catalysts (0.80 V for Pt/C-RuO2) and superior to ZIF polyhedrons-derived counterpart (0.90 V) as well as most Cobased bifunctional catalysts ever reported. The as-constructed Zn-air battery and overall water splitting electrolyzer based on Co@NCL delivered a high peak power density of 170 mW cm-2 and a small voltage of 1.70 V that affords a current density of 10 mA cm-2 along with robust long-term stability, respectively, which demonstrates its promising applications in rechargeable metal-air batteries and water splitting.
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