Cation modulation in dual-phase nickel sulfide nanospheres by pulsed laser irradiation for overall water splitting and methanol oxidation reaction. (15th July 2022)

• Record Type: Journal Article
• Authors: Chinnadurai, Deviprasath; Lee, Seung Jun; Yu, Yiseul; Nam, Sang Yong; Choi, Myong Yong
• Is Part Of: Fuel. Volume 320(2022)
• Publication Date: 2022-07-15
• Subjects: Nickel sulfide -- Cation modulation -- Pulsed laser irradiation -- Water splitting -- MOR; Fuel -- Periodicals; Coal -- Periodicals; Coal; Fuel; Periodicals; 662.6
• DOI: 10.1016/j.fuel.2022.123915
• Languages: English
• ISSNs: 0016-2361

Abstract

Graphical abstract: Highlights: Cation modulated Nickel sufide nanospheres fabricated via a pulsed laser technique. Homogenous shape selectivity resulted in higher surface bimetallic active sites. Co-Ni-S achieved an overpotential of 368 mV at 10 mA/cm 2 for OER. Higher ECSA of Cu-Ni-S resulted in excellent HER with an overpotential of 271 mV. Larger Cu accessible sites resulted in excellent MOR activity of 55.4 mA/cm 2 . Abstract: The development of a non-precious and highly active multifunctional electrocatalyst is essential for obtaining efficient electrochemical energy storage and conversion devices. Nickel derivate occupies the most important place when it comes to the transition metal-based electrocatalyst. In this study, we used a simple and extremely effective controllable pulsed laser irradiation (PLI) technique to fabricate dual-phase nickel sulfide, and we studied cation modulation using Co and Cu atoms. The multifunctional activity was witnessed by the performances of oxygen evolution reaction (OER), hydrogen evolution reaction (HER), and methanol oxidation reaction (MOR) measured in an alkaline medium. The cation adjustment resulted in the improvement of the catalytic performance of HER and OER during Cu and Co substitution, respectively. For the Co-Ni-S sample in OER, we achieved an overpotential of 368 mV at 10 mA/cm 2 in OER . The higher ECSA Cu-Ni-S sample improved HER activity at a lower overpotential of 271 mV at 10 mA/cm 2 and a lower Tafel slope of 98 mV/dec. The excellent bifunctional activity enhanced overall water splitting with a lower voltage of 1.88 V to achieve a geometrical current density of 10 mA/cm 2, with high durability. Meanwhile, the high selectivity of Cu resulted in a very high methanol electrooxidation activity with a current density as high as 55.4 mA/cm 2 . The detailed electrochemical studies were presented with their supporting physiochemical analysis. This report shows the efficiency and simplicity of fabricating transition metal derivatives and cation modulation using superficial laser methods.