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Metal–Organic Framework Derived Ni<sub>2</sub>P/FeP@NPC Heterojunction as Stability Bifunctional Electrocatalysts for Large Current Density Water Splitting
oleh: Huimin Jiang, Shuo Zhang, Qiuju Fu, Liting Yan, Jun Zhang, Xuebo Zhao
Format: | Article |
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Diterbitkan: | MDPI AG 2023-02-01 |
Deskripsi
The construction of heterojunction has been widely accepted as a prospective strategy for the exploration of non-precious metal-based catalysts that possess high-performance to achieve electrochemical water splitting. Herein, we design and prepare a metal-organic framework derived N, P-doped-carbon-encapsulated Ni<sub>2</sub>P/FeP nanorod with heterojunction (Ni<sub>2</sub>P/FeP@NPC) for accelerating the water splitting and working stably at industrially relevant high current densities. Electrochemical results confirmed that Ni<sub>2</sub>P/FeP@NPC could both accelerate the hydrogen and oxygen evolution reactions. It could substantially expedite the overall water splitting (1.94 V for 100 mA cm<sup>−2</sup>) which is close to the performance of RuO<sub>2</sub> and the Pt/C couple (1.92 V for 100 mA cm<sup>−2</sup>). In particular, the durability test exhibited that Ni<sub>2</sub>P/FeP@NPC delivers 500 mA cm<sup>−2</sup> without decay after 200 h, demonstrating the great potential for large-scale applications. Furthermore, the density functional theory simulations demonstrated that the heterojunction interface could give rise to the redistribution of electrons, which could not only optimize the adsorption energy of H-containing intermediates to achieve the optimal Δ<i>G</i><sub>H</sub>* in a hydrogen evolution reaction, but also reduce the Δ<i>G </i>value in the rate-determining step of an oxygen evolution reaction, thus improving the HER/OER performance.