NiCo-Layered Double Hydroxide-Derived B-Doped CoP/Ni₂P Hollow Nanoprisms as High-Efficiency Electrocatalysts for Hydrogen Evolution Reaction

Abstract

Rational design and controllable synthesis of multiple metal components according to chemical composition and morphology are essential for obtaining desirable electrochemical performance for efficient hydrogen production because of the morphology and synergistic effects of different components. Herein, we report an approach to facilely fabricate bimetal compounds with a well-defined hollow nanoprism structure using a self-templated strategy to synthesize novel hierarchical NiCo-layered double hydroxide (NiCo-LDH) nanosheets as precursors followed by in situ phosphorization. Among the as-synthesized products of different mole ratios of Ni/Co, the NiCo 2 −B−P nanoprisms that integrate the advantages of a hollow structure, an optimal Ni−Co synergistic effect, and a unique Bdoped CoP/Ni 2 P bimetallic phosphide derived from NiCo-LDH nanosheets exhibit excellent hydrogen evolution reaction (HER) activity in an alkaline solution at 10 mA cm −2 with the lowest overpotential of 78 mV and long-term stability. This study may offer an appropriate structure and compositional design of bimetallic alkaline HER catalysts.

Metal–organic framework derived carbon-encapsulated hollow CuO/Cu2O heterostructure heterohedron as an efficient electrocatalyst for hydrogen evolution reaction

“…2c, d and 3a–c), which are expected to show rich active sites, a faster kinetic rate, and reduced aggregation of active substances for improved electrochemical activity. 34…”

AlP-regulated phosphorus vacancies over Ni–P compounds promoting efficient and durable hydrogen generation in acidic media

“…4g shows that the TOF values of P V -np-Ni(Al)-40 were determined to be 0.21 and 0.44 s −1 at overpotentials of 100 and 150 mV, respectively. It reveals that P V -np-Ni(Al)-40 is far superior to Ni 2 P–Ni 12 P 5 /NF (0.11 s −1 at 100 mV), 53 S–NiCoP NW/CFP (0.024 s −1 at 100 mV), 54 C–Co 2 P (0.14 s −1 at 100 mV), 55 NiCo/NiCo–OH (0.23 s −1 at 150 mV), 56 Al–CoS 2 (0.164 s −1 at 150 mV), 57 P–NiSe 2 @N–CNTs/NC (0.17 s −1 at 200 mV), 58 NiCo 2 –B–P (0.17 s −1 at 200 mV) 59 and Se–CoP (0.158 s −1 at 200 mV). 60…”

Electron Density Modulation of MoO2/Ni to Produce Superior Hydrogen Evolution and Oxidation Activities

“…To further demonstrate the increased intrinsic activity of HER, electrochemical impedance spectroscopy tests were performed. The Nyquist plots of these electrode materials and the corresponding results of the equivalent circuit fitting through the dual constant phase element (CPE) model are given in Figure c and Table S1. , In the dual CPE model, solution resistance ( R s ) is the resistance between the working electrode and the reference electrode, R1 and CPE1 are potential-independent and related to surface porosity, while resistance of charge transfer ( R ct ) and CPE2 are potential-dependent and related to HER. − The R ct values of MoO 2 /Ni@NF and Ni@NF were 1.687 and 3.302 Ω, respectively, reflecting that MoO 2 /Ni@NF can exhibit better electron transport in HER …”