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Fe-Co LDH/MoP heterostructure with Fe and Co as intercalants for oxygen evolution electrocatalysis
Guangyu An1, Chaozheng Zhou1, Chuang Wu1
1Henan Institute of Advanced Technology, Zhngzhou University, Zhengzhou, 450001, China.
Abstract:
Due to the sluggish kinetics and unfavorable thermodynamics, oxygen evolution reaction (OER) remains as the bottleneck for efficient water splitting. Transition metal-based layered double hydroxides (LDHs) such as Fe-doped Co-based hydroxides (Fe-Co(OH)2) are exceptionally appealing OER catalyst due to their decent affordability and activity. To simultaneously enhance the active site exposure and electrical conductivity, Fe-Co(OH)2 is deposited on the surface of MoP nanoribbon (Fe-Co(OH)2/MoP) through a novel "MoO3 intercalation-phosphorization" protocol, where the atomically dispersed Fe and Co intercalants in the van der Waals (vdW) gap of 2D MoO3 are utilized as precursors to facilitate the exposure of Fe/Co sites at Fe-Co(OH)2/MoP surface. As results, Fe-Co(OH)2/MoP heterostructure exhibits remarkable electrocatalytic activity toward OER (overpotential: 240 mV at 10 mA cm-2; Tafel slope: 39.6 mV dec-1). Experimental and theoretical results suggest the Fe dopant in Fe-Co(OH)2/MoP facilitates the formation of Co(III) active species by inducing superexchange interaction between high-spin Fe(III) and low-spin Co(II), which substantially enhanced the electrocatalytic activity toward OER.
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