Multi⁃Shell Hollow Nickel⁃Cobalt Bimetallic Phosphide Nanospheres for Highly Efficient Oxygen Evolution Reaction

doi:10.19894/j.issn.1000-0518.210288

Chinese Journal of Applied Chemistry ›› 2022, Vol. 39 ›› Issue (4): 666-672.DOI: 10.19894/j.issn.1000-0518.210288

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Multi⁃Shell Hollow Nickel⁃Cobalt Bimetallic Phosphide Nanospheres for Highly Efficient Oxygen Evolution Reaction

Wei-Jin CAO¹, Lu BAI¹, Lan-Lan WU¹(), Jing-De LI¹, Shu-Yan SONG²()

^1.School of Chemical Engineering and Technology，Hebei University of Technology，Tianjin 300130，China
^2.State Key Laboratory of Rare Earth Research Utilization，Changchun Institute of Applied Chemistry，Chinese Academy of Sciences，Changchun 130022，China

Received:2021-06-15 Accepted:2021-08-26 Published:2022-04-01 Online:2022-04-19
Contact: Lan-Lan WU,Shu-Yan SONG
Supported by:
the National Natural Science Foundation of China(22001055);the Natural Science Foundation of Hebei Province(B2020202082);the Research Platform Project of Hebei Province Department of Education(BJ2020050)

Abstract

Abstract:

Oxygen evolution reaction （OER） is a key reaction in electrochemical systems such as metal-air batteries and hydrogen production by electrolysis of water. Research on high-efficiency and stable non-precious metal electrocatalysts is very important. In this paper， nickel-cobalt bimetallic phosphides （NiCo-P） with multi-shell hollow structures were prepared by high-temperature calcination with metal-organic framework （MOF） as precursors. The unique structure is conducive to the penetration of the electrolyte and mass transfer， and can provide a wealth of exposed active sites. At the same time， the nickel-cobalt bimetal has a synergistic effect to promote electrochemical performance. The results show that the NiCo-P-0.1 catalyst prepared with a molar ratio of nickel to cobalt of 0.1 exhibits good catalytic activity and stability in 1.0 mol/L KOH electrolyte， which has good application prospects. This work provides a brand new approach for the development of electrocatalytic oxygen evolution catalysts with highly activity and stability.

Key words: Electrocatalyst, Oxygen evolution reaction, Hollow structure, Bimetallic phosphide

CLC Number:

O611

Wei-Jin CAO, Lu BAI, Lan-Lan WU, Jing-De LI, Shu-Yan SONG. Multi⁃Shell Hollow Nickel⁃Cobalt Bimetallic Phosphide Nanospheres for Highly Efficient Oxygen Evolution Reaction[J]. Chinese Journal of Applied Chemistry, 2022, 39(4): 666-672.

Figures/Tables 4

Fig.1 SEM images （A， B） of NiCo-BTC-0.1；（C） SEM images，（D， E） TEM image，（F） HRTEM images and （G） corresponding elemental mapping images of NiCoP-0.1

Fig.2 XRD patterns of NiCoP-0.1 and NiCo-BTC-0.1（A）； Nitrogen adsorption-desorption curve， pore size distribution curve （B） and high-resolution XPS spectra for Ni2p （C）， Co2p （D）， P2p （E），O1s （F） of NiCoP-0.1

Fig.3 LSV curves of NiCoP-0.1， NiCoP-0.5， CoP and Ir/C （A）. Tafel plots of NiCoP-0.1， NiCoP-0.5 and CoP （B）. Nyquist plots for NiCoP-0.1， NiCoP-0.5 and CoP （C）. LSV curves of NiCoP-0.1 before and after 5000 CV cycles and chronoamperometry （I-t） curve at 1.55 V （D）

Fig.4 NiCoP-0.1（A）， NiCoP-0.5（B） and CoP（C） CVs at different scan rates from 10， 20， 30， 40 to 50 mV/s and current density at 1.10 V plotted against scan rate of NiCoP-0.1，NiCoP-0.5 and CoP （D）

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Multi⁃Shell Hollow Nickel⁃Cobalt Bimetallic Phosphide Nanospheres for Highly Efficient Oxygen Evolution Reaction

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