Production of NiO/N-doped carbon hybrid and its electrocatalytic performance for oxygen evolution reactions
- PDF / 1,193,317 Bytes
- 7 Pages / 595.276 x 790.866 pts Page_size
- 113 Downloads / 212 Views
Carbon Letters https://doi.org/10.1007/s42823-019-00118-9
ORIGINAL ARTICLE
Production of NiO/N‑doped carbon hybrid and its electrocatalytic performance for oxygen evolution reactions Sujin Seok1 · Dawoon Jang1 · Haeju Kim1 · Sungjin Park1 Received: 29 August 2019 / Revised: 26 November 2019 / Accepted: 17 December 2019 © Korean Carbon Society 2020
Abstract Oxygen evolution reaction (OER) is an essential step at an anode in electrochemical water-splitting process and requires efficient electrocatalysts to reduce overpotentials. Although precious metal-based materials, such as RuO2, IrO2 and their hybrids with other components, performed excellently as OER electrocatalysts, their high cost has limited practical applications. Consequently, earth-abundant metal components including Fe, Co, and Ni have been investigated as alternatives. In this work, the hybridization of Ni-containing species with conductive carbon-based materials was used to prevent aggregation of active species and improve electrochemical catalytic performance. A new hybrid material composed of NiO nanoparticles and N-doped carbon materials was prepared. The NiO particles with a narrow size distribution were well dispersed on the surface of carbon-based materials. The hybrid showed improved electrocatalytic performance for OER than single components of NiO and N-doped carbon materials. Keywords Oxygen evolution reactions · Nickel oxides · N-doped carbon materials Water splitting is an important process for renewable and environment-friendly energy-storage systems [1]. The oxygen evolution reaction (OER) is an essential step at an anode during electrochemical water-splitting process [2] and requires efficient electrocatalysts to reduce overpotentials [2, 3]. Although precious metal-based materials, such as R uO2, IrO2 and their hybrids with other components, showed excellent properties as OER electrocatalysts, the high cost has limited their practical applications [4]. Consequently, earthabundant metal components including Fe, Co, and Ni have been investigated as alternative electrocatalysts [5]. The previous study suggested that Ni-based materials are good candidates due to the good interaction ability of Ni-containing active species with a reaction intermediate, O Had [6]. Various materials, such as N iP2, Ni chalcogenides, nickel hydroxide, and nickel oxides, exhibit promising properties such as low overpotentials for OER in alkaline electrolytes.
* Sungjin Park [email protected] 1
Department of Chemistry and Chemical Engineering, Inha University, 100 Inha‑ro, Michuhol‑gu, Incheon 22212, Republic of Korea
However, their low conductivity and slow kinetics for OER limited to reach the maximum catalytic performance [7–9]. Carbon-based nanomaterials, such as chemically modified graphenes, carbon nanotubes, carbon nitrides, and activated carbons have been widely used as supports for various electrocatalysts [10]. Due to their high surface areas, fast electron transfer, and tunable chemical properties, they often enhance electroca
Data Loading...
