Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 12, Issue 11, Pages 12919-12929Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c01315
Keywords
flowerlike LDHs; monometallic Co-LDHs; Con+ (n=2, 3) concentration; oxygen evolution reaction; electrochemical sensors
Funding
- National Natural Science Foundation of China [21777109]
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It is highly desirable but challenging to develop a facile and scalable strategy to synthesize efficient bifunctional electrocatalysts for oxygen evolution and H2O2 reduction by engineering the active site of monometallic-layered double hydroxides (LDHs). Herein, we developed a convenient, efficient, and scalable method for the construction of monometallic Co-LDHs with tunable Con+ (n = 2, 3) concentration by a one-pot solvothermal reaction in a short time (e.g., 2 and 4 h) using only cobalt nitrate and hexamine as raw materials. The catalytic performance of Co-LDHs was mainly determined by the Con+ (n = 2, 3) concentration, which could be simply regulated by tuning the solvothermal time. Combining the joint merits of three-dimensional flowerlike architecture (abundant accessible active sites and a fast electron/mass transport), Co-LDHs-4 with abundant Co3+ species exhibited an excellent electrocatalytic activity for oxygen evolution reaction in terms of a low overpotential at 10 mA cm(-2) (eta(10) = 241 mV) and long-term durability for 70 h at 100 mA cm(-2), better than the state-of-the-art IrO2 and most of the reported analogues. Besides, Co-LDHs-2 enriched in Co3+ displayed a superior electrochemical activity for H2O2 detection with a broad linear range (0.002-20 mM), a low detection limit (0.002 mM), and a high response sensitivity (272.02 mu A mM(-1) cm(-2)). Therefore, this work opens a new horizon for the rational development of a highly active electrocatalyst with tunable concentrations of active components.
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