A unique cobalt-phosphide-boride (Co-P-B) catalyst was synthesized via simple chemical-reduction route. The obtained catalyst was amorphous in nature, resembling the spherical morphology of Co-B nanoparticles. X-ray photoelectron spectroscopy revealed that B loses electrons to Co while P gains electrons from Co. This unique electron transfer mechanism in Co-P-B is a combination of the characteristics showcased by Co-B and Co-P catalysts individually. The optimized catalyst (Co-P-B-5) showed overpotentials of 145 mV and 290 mV to achieve the benchmark current density of 10 mA/cm2 for HER and OER, respectively, in 1 M NaOH. From theoretical calculations, it was observed that addition of P modulates the electron density at Co sites, thereby optimizing the H-adsorption capability, leading to higher HER rate. During anodic polarization, Co-P-B-5 shows formation of large number of CoOOH species on its surface, facilitating OER. Finally, stability, recyclability and wide-pH suitability of Co-P-B-5 was established to demonstrate its industrial viability.

A unique amorphous cobalt-phosphide-boride bifunctional electrocatalyst for enhanced alkaline water-splitting / Chunduri, A; Gupta, S; Bapat, O; Bhide, A; Fernandes, R; Patel, M K; Bambole, V; Miotello, A; Patel, N. - In: APPLIED CATALYSIS. B, ENVIRONMENTAL. - ISSN 0926-3373. - STAMPA. - 259:(2019), pp. 118051-1-118051-9. [10.1016/j.apcatb.2019.118051]

A unique amorphous cobalt-phosphide-boride bifunctional electrocatalyst for enhanced alkaline water-splitting

Miotello A;
2019

Abstract

A unique cobalt-phosphide-boride (Co-P-B) catalyst was synthesized via simple chemical-reduction route. The obtained catalyst was amorphous in nature, resembling the spherical morphology of Co-B nanoparticles. X-ray photoelectron spectroscopy revealed that B loses electrons to Co while P gains electrons from Co. This unique electron transfer mechanism in Co-P-B is a combination of the characteristics showcased by Co-B and Co-P catalysts individually. The optimized catalyst (Co-P-B-5) showed overpotentials of 145 mV and 290 mV to achieve the benchmark current density of 10 mA/cm2 for HER and OER, respectively, in 1 M NaOH. From theoretical calculations, it was observed that addition of P modulates the electron density at Co sites, thereby optimizing the H-adsorption capability, leading to higher HER rate. During anodic polarization, Co-P-B-5 shows formation of large number of CoOOH species on its surface, facilitating OER. Finally, stability, recyclability and wide-pH suitability of Co-P-B-5 was established to demonstrate its industrial viability.
Chunduri, A; Gupta, S; Bapat, O; Bhide, A; Fernandes, R; Patel, M K; Bambole, V; Miotello, A; Patel, N
A unique amorphous cobalt-phosphide-boride bifunctional electrocatalyst for enhanced alkaline water-splitting / Chunduri, A; Gupta, S; Bapat, O; Bhide, A; Fernandes, R; Patel, M K; Bambole, V; Miotello, A; Patel, N. - In: APPLIED CATALYSIS. B, ENVIRONMENTAL. - ISSN 0926-3373. - STAMPA. - 259:(2019), pp. 118051-1-118051-9. [10.1016/j.apcatb.2019.118051]
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11572/248935
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