Journal
CHEMSUSCHEM
Volume 13, Issue 6, Pages 1645-1655Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.201901364
Keywords
electrocatalysis; layered double hydroxide; nanosheets; oxygen evolution reaction; two-dimensional materials
Funding
- World Class Professor (WCP) program [123.11/D2.3/KP/2018]
- Australian Research Council (ARC) [FT150100479, FL160100089]
- QUT projects [322170-0355/51, 322170-0348/07]
- Institute of Technology Bandung (ITB), Indonesia
- Ministry of Research, Technology, and Higher Education of Indonesia
- Lembaga Pengelola Dana Pendidikan (LPDP), Ministry of Finance of Indonesia
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Layered double hydroxides (LDHs) containing first-row transition metals such as Fe, Co, and Ni have attracted significant interest for electrocatalysis owing to their abundance and excellent performance for the oxygen evolution reaction (OER) in alkaline media. Herein, the assembly of holey iron-doped nickel-cobalt layered double hydroxide (NiCo-LDH) nanosheets ('holey nanosheets') is demonstrated by employing uniform Ni-Co glycerate spheres as self-templates. Iron doping was found to increase the rate of hydrolysis of Ni-Co glycerate spheres and induce the formation of a holey interconnected sheet-like structure with small pores (1-10 nm) and a high specific surface area (279 m(2) g(-1)). The optimum Fe-doped NiCo-LDH OER catalyst showed a low overpotential of 285 mV at a current density of 10 mA cm(-2) and a low Tafel slope of 62 mV dec(-1). The enhanced OER activity was attributed to (i) the high specific surface area of the holey nanosheets, which increases the number of active sites, and (ii) the improved kinetics and enhanced ion transport arising from the iron doping and synergistic effects.
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