4.7 Article

An Efficient Electrocatalyst Based on Vertically Aligned Heteroatom(B/N/P/O/S)-Doped Graphene Array Integrated with FeCoNiP Nanoparticles for Overall Water Splitting

Journal

ADVANCED SUSTAINABLE SYSTEMS
Volume 6, Issue 5, Pages -

Publisher

WILEY-V C H VERLAG GMBH
DOI: 10.1002/adsu.202100436

Keywords

electrocatalysts; FeCoNiP; heteroatom doped graphene; overall water splitting

Funding

  1. National Natural Science Foundation of China [21902127]
  2. Key Technology Research and Development Program of Shaanxi province (CN) [2021KW-24]

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In this study, an excellent electrocatalyst system for overall water splitting was prepared by integrating different vertically aligned heteroatom-doped graphene arrays with FeCoNiP nanoparticles. The electrocatalyst system exhibited good electrocatalytic performance and durability, enabling efficient overall water splitting reactions.
Iron group metal phosphides (IMPs) are one of the most promising substitutes for non-noble electrocatalysts in overall water splitting. In this work, an electrocatalyst system consisting of different vertically aligned heteroatom-doped graphene arrays (X-rGO, X = N, P, B, O, S) integrated with FeCoNiP nanoparticles (FeCoNiP@X-rGO, X = N, P, B, O, S) is prepared for overall water splitting. The unique vertical structure and the synergistic effect between the P in P-rGO and the P in FeCoNiP leads to the excellent electrocatalytic performance of FeCoNiP@P-rGO by exhibiting low overpotentials (121 and 216 mV) at a current density of 10 mA cm(-2) for hydrogen evolution reaction in 1 M KOH and 0.5 M H2SO4, respectively. As well as a low overpotential (354 mV) at a current density of 10 mA cm(-2) for the oxygen evolution reaction in 1.0 M KOH. The FeCoNiP@P-rGO electrocatalyst exhibits an outstanding durability toward overall water splitting in alkaline electrolytes, and excellent Faraday efficiency (about 92%) as well. This work provides an insight in proper tuning and the development of appropriate substrates for IMPs and other transition metal compounds toward cost-effective and high efficiency electrocatalysts for water splitting reactions.

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