Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Effect of Sulfurization on SILAR Synthesized Cobalt Phosphate Hydrate Nanosheets for Oxygen Evolution Reaction

  • Kamble, Girish (Optoelectronic Convergence Research Center, Department of Materials Science and Engineering, Chonnam National University) ;
  • Malavekar, Dhanaji (Optoelectronic Convergence Research Center, Department of Materials Science and Engineering, Chonnam National University) ;
  • Jang, Suyoung (Optoelectronic Convergence Research Center, Department of Materials Science and Engineering, Chonnam National University) ;
  • Kim, Jin Hyeok (Optoelectronic Convergence Research Center, Department of Materials Science and Engineering, Chonnam National University)
  • Received : 2022.09.15
  • Accepted : 2022.09.30
  • Published : 2022.10.27
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Abstract

The oxygen evolution reaction (OER) is very sluggish compared to the hydrogen evolution reaction (HER). Considering this difference is essential when designing and developing a cost-effective and facile synthesis method for a catalyst that can effectively perform OER activity. The material should possess a high surface area and more active sites. Considering these points, in this work we successfully synthesized sheets of cobalt phosphate hydrate (CP) and sulphurated cobalt phosphate hydrate (CPS) material, using simple successive ionic layered adsorption and reaction (SILAR) methods followed by sulfurization. The CP and CPS electrodes exhibited overpotentials of 279 mV with a Tafel slope of 212 mV dec-1 and 381 mV with a Tafel slope of 212 mV dec-1, respectively. The superior performance after sulfurization is attributed to the intrinsic activity of the deposited well-aligned nanosheet structures, which provided a substantial number of electrochemically active surface sites, speeded electron transfer, and at the same time improved the diffusion of the electrolyte.

Keywords

Acknowledgement

This work was supported by Priority Research Centers Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (2018R1A6A1A03024334). This research was supported by Basic Science Research Capacity Enhancement Project through Korea Basic Science Institute (National research Facilities and Equipment Center) grant funded by the Ministry of Education (grant No. 2019R1A6C1010024).

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