Bifunctional P-Intercalated and Doped Metallic (1T)-Copper Molybdenum Sulfide Ultrathin 2D-Nanosheets with Enlarged Interlayers for Efficient Overall Water Splitting

Abstract

Metallic (1T) molybdenum disulfide (MoS 2 ) is a much better electrocatalyst than the semiconducting (2H) MoS 2 because of its superior conductivity, presence of active basal planes, and bulky interlayers. However, the lack of thermodynamic stability has hindered its practical uses. The insertion of transition metals and nonmetals in the interlayers and the crystal is known to improve both the thermodynamic stability and the catalytic efficacy of 1T-MoS 2 . In this study, for the first time we have developed an electrocatalyst for water splitting based on metallic copper molybdenum sulfide (1T-CMS). The present catalyst, P-doped and intercalated 1T-CMS ultrathin 2D nanosheets on carbon cloth (P-1T-CMS@CC), demonstrates excellent catalytic efficacy for both the hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER). It required an overpotential of 95 mV for HER and of 284 mV for OER at a current density of 10 mA cm −2 . The P-1T-CMS@CC(+ −) device also shows excellent performance, requiring a cell voltage of only 1.51 V at a current density of 10 mA cm −2 .

A hybrid trimetallic–organic framework-derived N, C co-doped Ni–Fe–Mn–P ultrathin nanosheet electrocatalyst for proficient overall water-splitting

“…Then, the polarization curves were recorded at a lower scan rate of 2 mV s À1 to suppress the redox peak of Ni foam. The measured potentials were converted against RHE according to the Nernst equation 29,30 All the linear sweep voltammetry (LSV) curves were iR-corrected using the equation E corr ¼ E RHE À iR s , 29,31,32 where R s and E corr are the solution resistance and iR-corrected potential, respectively. The Tafel slopes were calculated from the corresponding polarization curves following the equation h ¼ b log j + a, 29 where h, j, and b are the overpotential, current density, and Tafel slope, respectively.…”

Cobalt Phosphide Nanoparticles Synthesized by Solvothermal Phosphidization of Metal-Organic Frameworks for Electrocatalytic Oxygen Evolution

“…The high price and scarcity of precious metal catalysts limit their widespread application [6]. Therefore, developing efficient OER catalysts based on earth-abundant elements is crucial to reduce energy consumption and the cost for hydrogen production [7][8][9][10][11].…”

Cr-Doped NiCo-Layered Double Hydroxide/N-Doped Graphene for a Bifunctional Electrocatalyst for Rechargeable Zinc Air Batteries

“…The overpotential of NiCoCr LDH/ N-rGO at a current density of 10 mA/cm 2 (Δη j=10 ), which is an indicator for the evaluation of OER activity, was 340 mV, lower than those of the others except for 330 mV of NiCoCr LDH. Similarly, the Tafel slope of NiCoCr LDH/N-rGO for the OER is 62 mV/dec, lower than that of the others and slightly higher than 58 mV of NiCoCr LDH (Figure 4(d)) [38]. These results can be explained by increased defects of NiCo LDH by Co doping, such as oxygen defects, as indicated by the XPS results [39].…”