Synthesis of 3D Hexagram-Like Cobalt–Manganese Sulfides Nanosheets Grown on Nickel Foam: A Bifunctional Electrocatalyst for Overall Water Splitting

Abstract

The exploration of low-cost and efficient bifunctional electrocatalysts for oxygen evolution reaction and hydrogen evolution reaction through tuning the chemical composition is strongly required for sustainable resources. Herein, we developed a bimetallic cobalt–manganese sulfide supported on Ni foam (CMS/Ni) via a solvothermal method. It has discovered that after combining with the pure Co9S8 and MnS, the morphologies of CMS/Ni have modulated. The obtained three-dimensionally hexagram-like CMS/Ni nanosheets have a significant increase in electrochemical active surface area and charge transport ability. More than that, the synergetic effect of Co and Mn has also presented in this composite. Benefiting from these, the CMS/Ni electrode shows great performance toward hydrogen evolution reaction and oxygen evolution reaction in basic medium, comparing favorably to that of the pure Co9S8/Ni and MnS/Ni. More importantly, this versatile CMS/Ni can catalyze the water splitting in a two-electrode system at a potential of 1.47 V, and this electrolyzer can be efficiently driven by a 1.50 V commercial dry battery. Electronic supplementary materialThe online version of this article (doi:10.1007/s40820-017-0160-6) contains supplementary material, which is available to authorized users.

High-Index-Faceted Ni3S2 Branch Arrays as Bifunctional Electrocatalysts for Efficient Water Splitting

“…Production of hydrogen/oxygen fuels through electrochemical water splitting is considered one of the most efficient green technologies, although large-scale synthesis of costeffective electrocatalysts used in this process still remains a huge challenge [1][2][3][4][5]. Platinum (Pt)/Pt-based alloys and iridium/ruthenium oxides (IrO 2 /RuO 2 ) are regarded as the most efficient electrocatalysts for electrochemical hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), respectively [6][7][8][9][10]. However, their high cost and compromised stability as well as the low earth abundance of these metals impede their widespread application [11][12][13][14][15].…”

Bifunctional Electrocatalysts Based on Mo-Doped NiCoP Nanosheet Arrays for Overall Water Splitting

“…Among various alternative materials, transition metal phosphides (TMPs) have gained considerable attention, owing to the suitable d-electron configuration and rich chemical states [12][13][14]. In particular, NiCoP with the enhanced electrical conductivity and the synergistic effect from Ni and Co shows good catalytic performances for overall water splitting [15,16].…”

Hollow Nanocages of NixCo1−xSe for Efficient Zinc–Air Batteries and Overall Water Splitting

“…The oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) are the key reversible reactions occurring at the cathode of ZABs and largely determine the energy-conversion efficiency of ZABs [4]. The OER and the hydrogen evolution reaction (HER) are the two electrochemical reactions for catalyzing overall water splitting [5][6][7]. Pt-based materials have been widely considered as state-of-the-art electrocatalysts for the ORR and HER [8][9][10][11][12], while RuO 2 and IrO 2 are the standard high-efficiency OER catalysts [13,14].…”