An efficient CoMoS₂ nanosheets on nitrogen, sulfur dual doped reduced graphene oxide as an electrocatalyst for the hydrogen evolution reaction

Abstract

An increase in the necessity for clean and renewable energy leads to the production of hydrogen by several methods. Splitting of water by electrolysis is catching up to be a productive method to produce pure hydrogen with low cost and high efficiency using highly active non-noble metal electrocatalysts. MoS 2 has been widely studied for energy conservation devices for its 2D layered structure, excellent electronic conductivity, and high specific surface area. Incorporating transition metals (Co or Ni) will alter the intrinsic characteristic of MoS 2 by enhancing its electrocatalytic property for hydrogen evolution reaction. Hence MoS 2 , CoMoS 2, Co 0.5 MoS 2 and a composite of Co 0.5 MoS 2 with nitrogen sulfur doped graphene oxide were prepared by a facile hydrothermal method. Better performance was observed for the composite of Co 0.5 MoS 2 with N, S-rGO compared to other prepared catalysts with a low onset potential of 85 mV, overpotential (at 10 mA/cm 2 ) of 178 mV and Tafel slope of 63.8 mV/ dec. Further, the stability of the catalyst evaluated by chronoamperometric analysis demonstrated steady electrochemical performance for 12 hours.

Synthesis of nickel hydroxide/reduced graphene oxide composite thin films for water splitting application

“…However, their shortage and high cost as well as rapid deactivation of these precious metals, always limit their widespread large-scale application. 6 The various earth-abundant and cost-effective transition metal-based catalysts such as hydroxide/oxide, 4,6 phosphide, 7 chalcogenide, [8][9][10] and carbides, [11][12][13][14] have been explored as OER electrocatalyst due to their high catalytic performance along with better stability.…”

Synthesis of N, P dual‐doped MoS 2 on hollow carbon spheres for hydrogen evolution reaction

“…For P-MoS 2 @NCs-2, the η 10 is 147 mV, which is lower than the previous reported MoS 2based catalysts. 18,47,48 The η 10 of the P-MoS 2 @NCs-1 (219 mV), −3 (281 mV), MoS 2 @NCs (307 mV), NCs (396 mV), and MoS 2 (316 mV) are 72, 134, 160, 249, and 169 mV higher compared with P-MoS 2 @NCs-2. Moreover, the electrocatalytic properties of the obtained products at different current densities are also investigated (Figure 6B).…”

Synthesis of MoS x /Ni‐metal‐organic framework‐74 composites as efficient electrocatalysts for hydrogen evolution reactions

“…Moreover, Ni‐MOF‐74 provides a robust platform for the growth of MoS x . This incorporation brings beneficial effects to compare with previous reports 46‐53 . First, Ni sites interacted with S of MoS x , leading to the formation of NiMoS phases, which reduces the hydrogen adsorption energy on catalysts 14,21 .…”

“…This incorporation brings beneficial effects to compare with previous reports. [46][47][48][49][50][51][52][53] First, Ni sites interacted with S of MoS x , leading to the formation of NiMoS phases, which reduces the hydrogen adsorption energy on catalysts. 14,21 Second, the interaction of Ni and S increases the amount of shared sulfide species, characterized by X-ray photoelectron spectroscopy (XPS).…”