Nitrogen incorporated nickel molybdenum sulfide as efficient electrocatalyst for overall water splitting

doi:10.1016/j.jmst.2021.01.091

Abstract

Abstract:

Developing bifunctional electrocatalysts with improved efficiency and stability in overall water splitting is of extreme importance for renewable energy utilization. In this work, an in situ N doping strategy was demonstrate to boost the efficiency and stability of nickel molybdenum sulfide both in electrocatalytic hydrogen evolution reaction and oxygen evolution reaction. Experimental and theoretical results indicate that such modification offers enriched active sites for electrochemical reaction, and further increases the kinetic driven force of water electrolysis. As a result, the N-NiMoS electrode exhibits a remarkably improved performance with rather low potential of 1.54 V to offer a current density of 10 mA cm^-2 for overall water splitting, which is 130 mV decrease than that of pristine one. In addition, impressive electrochemical stability also reveals a 76.6% preservation of initial current density after 100 h test, which is superior than that of pristine one after 25 h test. Therefore, the potential to enhance the performance of electrocatalysts by as-proposed route promises a valuable way to develop efficient catalysts with enhanced property for electrochemical applications.

Key words: Bifunctional electrocatalyst, Water splitting, Nitrogen incorporation, Nickel molybdenum sulfide

Kena Wu, Xiaonan Wei, Deng Li, Peng Hu. Nitrogen incorporated nickel molybdenum sulfide as efficient electrocatalyst for overall water splitting[J]. J. Mater. Sci. Technol., 2022, 99: 270-276.

Figures/Tables 6

Fig. 1. Analysis of morphological and structural evolution. SEM images of (a) NiMoO and (b) N-NiMoS. TEM images of (c) NiMoO and (d) N-NiMoS, scale bars in (c) and (d) are 200 nm, respectively. (e) HRTEM and (f) element mapping of N-NiMoS. (g) corresponding XRD pattern to reveal structural evolution.

Fig. 2. Comparison of XPS spectra of NiMoS and N-NiMoS: (a) Ni 2p, (b) Mo 3d, (c) S 2p and (d) N 1 s.

Fig. 3. Electrochemical HER performance of different samples: (a) LSV curves, (b) Tafel plots, (c) comparison of overpotential at 10 mA cm-2 and (d) Tafel slopes of Nyquist plots at a potential of 0.125 V, (e) curves of current density versus scan rates, and (f) stability tests.

Fig. 4. (a) Electron density difference of NiMoS and N-NiMoS, (b) free energy profiles of the intermediate state during the HER process.

Fig. 5. Electrochemical OER performance of different samples: (a) LSV curves, (b) Tafel plots, (c) Nyquist plots and (d) stability tests.

Fig. 6. Overall water splitting of a two-electrode cell using NiMoS and N-NiMoS as both the cathode and anode in 1 M KOH: (a) LSV curve and (b) stability tests of NiMoS4 and N-NiMoS4.

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