NiMoCo layered double hydroxides for electrocatalyst and supercapacitor electrode

Abstract

Non-noble-metal electrode materials with high durability and efficiency have become the frontiers of energy conversion and storage fields. However, conventional electrode materials often show high overpotential and low conductivity. To solve this problem, we fabricate a NiMo x Co 2−x layered double hydroxide (LDH)/Ni foam (NF) product through a facile hydrothermal route. The as-prepared NiMo-Co-LDH/NF catalyst possesses an overpotential of 123 mV for hydrogen evolution reaction (HER) at 10 mA cm −2 and 279 mV for oxygen evolution reaction (OER) at 20 mA cm −2. The as-obtained product exhibits excellent overall water splitting performances. Meanwhile, as the electrode material for supercapacitor, it delivers high specific capacitance and excellent cyclic performance. The asymmetric supercapacitor assembled with NiMoCo-LDH/NF//active carbon exhibits 93% of its initial capacity after 8000 cycles.

Significant Change of Metal Cations in Geometric Sites by Magnetic‐Field Annealing FeCo2O4 for Enhanced Oxygen Catalytic Activity

“…[6,7] Ideally, remarkable ORR/OER bifunctional electrocatalysts should have excellent catalytic activity, stability, and economic feasibility. [8][9][10][11] In recent years, increasing attention has been paid to spinel oxides (AB 2 O 4 ), which are excellent oxygen electrocatalysts with distinct d-band electronic configurations. [12][13][14][15][16][17][18][19][20] In the spinel lattice, A 2+ and B 3+ ions occupy the tetrahedron and octahedron, and they are surrounded by four and six oxygen anions, respectively.…”

Facile synthesis of dendritic Ni3S2 nanosheet arrays for hybrid supercapacitor electrodes

“…Binding energies at 854.5 eV and 872.2 eV correspond to Ni 2+ , and those at 855.9 eV and 873.5 eV can be ascribed to Ni 3+ in Ni 2p spectra. In addition, the satellite peaks at 861.2 eV and 879.2 eV are caused by electron transition in valence band [25]. S 2p spectra (Fig.…”

Synthesis of NiCo2S4@NiMoO4 Nanosheets with Excellent Electrochemical Performance for Supercapacitor

“…The existence of Co 2+ and Co 3+ can be proved by spin orbit coupling. In addition, the satellite peaks at the binding energies of 784.8 eV and 879.2 eV are named Sat., which are caused by the electronic transition in the valence band [21,22]. Mo 3d spectra are shown in Fig.…”