A novel particle-in-nanoplate architecture of iron nickel phosphide intertwined with carbon nanotubes for efficient water oxidation and high-performance sodium-ion batteries

Add time:07/31/2019    Source:sciencedirect.com

The oxygen evolution reaction (OER) with sluggish kinetics is considered the bottleneck for developing clean and efficient H2 production from electrochemical water splitting. Exploring a high-efficient and good durability OER electrocatalyst to promote the reaction rate has drawn enormous attention. Herein, a particle-in-nanoplate architecture constructed by self-assembled Ni2.3FeP3.4 nanoparticles intertwined with the carbon nanotubes (Ni2.3FeP3.4/CNTs) is synthesized. The architecture of the resultant novel electrocatalyst Ni2.3FeP3.4/CNTs, which possesses the optimal balance of electrochemical active site, ion and electron conductivity, phosphorous content, delivers highly effective and stable electrocatalytic performance. In detail, as for OER, the Ni2.3FeP3.4/CNTs exhibits extraordinarily high-efficient with the smallest onset potential of ∼1.43 V vs. RHE, the lowest over-potential of 239 mV and 282 mV to reach the current densities of 10 and 100 mA cm−2, respectively, and the smallest Tafel slopes of 26.9 mV dec−1 in 1 M KOH. During 12 h galvanostatic electrolysis, the voltage is well maintained without any significant increase, representing a stable non-precious-metal catalyst for water oxidation. Moreover, a lower cell voltage of 1.523 V is achieved at a current density of 10 mA cm−2 by using it as a cathode in the overall water splitting. In addition, for the first time, the Ni2.3FeP3.4/CNTs is designed as an anode material for sodium ion batteries (SIBs). Consequently, the as-prepared Ni2.3FeP3.4/CNTs nanoarchitecture shows a high reversible capacity of 335.1 mAh g−1 at 100 mA g−1, excellent rate capability of 58.3 mA h g−1 under 10 A g−1, and stable long-term cycling performance.

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