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.
Highlights
Electrocatalytic water splitting has been regarded as the most promising and feasible technology to produce clean hydrogen fuel from aqueous solutions [1,2,3]
The X-ray diffraction (XRD) pattern of CMS reveals the crystal structures of the Co9S8 and MnS are still maintained in CMS after modulating with them as a composite
The cobalt–manganese sulfide supported on Ni foam (CMS/Ni) reveals a much smaller onset potential at - 88 mV and larger hydrogen evolution reaction (HER) current than those of Co9S8/Ni, MnS/Ni and bare Ni foam. This result highlights the catalytic activity of CMS/Ni has significantly enhanced after combining Co9S8/ Ni with MnS/Ni as a composite, which may be ascribed to the synergistic effect of Co and Mn
Summary
Electrocatalytic water splitting has been regarded as the most promising and feasible technology to produce clean hydrogen fuel from aqueous solutions [1,2,3]. Precious metal oxide (e.g., RuO2, IrO2) and noble metal (e.g., Pt, Ir, Rh) electrocatalysts are so far known as the most efficient electrocatalysts toward OER and HER, respectively, but the high cost and scarcity have limited their widespread application [6, 7] In this regard, tremendous efforts have been devoted to explore alternatively earth-abundant and cost-effective transition metal materials for OER or HER over the past several decades [8,9,10,11,12,13,14,15,16,17,18,19,20,21,22]. Yang et al [50] synthe sized a Co(II)1-xCo(0)x/3Mn(III)2x/3S nanoparticles combining with B/N-codoped mesoporous nanocarbon They investigated the formation of different valence and electronic states of Co and Mn ions in facilitating the catalytic activity. The CMS/Ni was designed as an efficient electrolyzer for overall water splitting
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