Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 11, Issue 8, Pages 8106-8114Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b22133
Keywords
ZIF-67; (Ni,Co)Se-2; NiFe layered double hydroxide; heterostructure; oxygen evolution reaction
Funding
- National Key Research and Development Program of China [2017YFE0120500]
- National Natural Science Foundation of China [51502099]
- Fundamental Research Funds for the Central Universities [HUST 2018KFYYXJJ051]
- Analytical and Testing Center of Huazhong University of Science and Technology
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High-efficient electrocatalysts are crucial for fuel cell applications; however, the whole cell performance is generally restricted by the anodic part because of the sluggish kinetics involved in the oxygen evolution reaction (OER) process. Herein, a hierarchical hollow (Co,Ni)Se-2@NiFe layered double hydroxide (LDH) nanocage was synthesized by deriving from the metal-organic framework (MOF) of ZIF-67. Concretely, it involves first fabrication of hollow rhombic (Co,Ni)Se-2 nanocages and then deposition of NiFe LDH nanosheets on the surface of nanocages. Notably, the incorporation of Ni into Co-based ZIF-67 (via ion-exchange) could tail the atomic arrangement of the MOF, exposing more additional active sites in the following selenization treatment. The as-synthesized (Co,Ni)Se-2@NiFe LDH demonstrates splendid OER performance with a small overpotential of 277 mV (to launch a current density of 10 mA cm(-2)), a small Tafel slope of 75 mV dec(-1), and robust durability (a slight stability decay of 5.1% after 17 h of continuous test), not only surpassing the commercial RuO2 but also being comparable/superior to most reported nonprevious metal-based catalysts. Upon analysis, the outstanding OER performance is attributed to the optimized adsorption/desorption nature of iron and nickel/cobalt toward the oxygenated species and partial delocalization of spin status at the interface via the bridging O2-. This work represents a solid step toward exploration of advanced catalysts with deliberate experimental design and/or atom tailoring.
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