Vertical Growth of 2D Amorphous FePO4 Nanosheet on Ni Foam: Outer and Inner Structural Design for Superior Water Splitting,Advanced Materials

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Vertical Growth of 2D Amorphous FePO4 Nanosheet on Ni Foam: Outer and Inner Structural Design for Superior Water Splitting
Advanced Materials ( IF 27.4 ) Pub Date : 2017-10-25 , DOI: 10.1002/adma.201704574
Lei Yang ₁ , Zenglong Guo ₁ , Jing Huang ₁ , Yaoning Xi ₁ , Rongjie Gao ₁ , Ge Su ₁ , Wei Wang _{1,

2} , Lixin Cao ₁ , Bohua Dong ₁

Affiliation

Rational design of highly efficient bifunctional electrocatalysts based on 3D transition‐metal‐based materials for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) is of great importance for sustainable energy conversion processes. Herein, a novel strategy involving outer and inner structural engineering is developed for superior water splitting via in situ vertical growth of 2D amorphous FePO₄ nanosheets on Ni foam (Am FePO₄/NF). Careful experiments and density functional theory calculations show that the inner and outer structural engineering contributing to the synergistic effects of 2D morphology, amorphous structure, conductive substrate, and Ni−Fe mixed phosphate lead to superior electrocatalytic activity toward OER and HER. Furthermore, a two‐electrode electrolyzer assembled using Am FePO₄/NF as an electrocatalyst at both electrodes gives current densities of 10 and 100 mA cm⁻² at potentials of 1.54 and 1.72 V, respectively, which is comparable to the best bifunctional electrocatalyst reported in the literature. The strategies, introduced in the present work, may open new opportunities for the rational design of other 3D transition‐metal‐based electrocatalyst through an outer and inner structural control to strengthen the electrocatalytic performance.

中文翻译：

Ni泡沫上2D非晶态FePO4纳米片的垂直生长：优异水分解的内部和内部结构设计

基于3D过渡金属基材料的高效双功能电催化剂的合理设计对氧释放反应（OER）和氢释放反应（HER）的设计对于可持续的能源转化过程至关重要。在本文中，涉及的外部和内部结构工程的新策略是优越的水分解经由2D无定形的FePO原位垂直生长开发_4个纳米片上的Ni泡沫（AM的FePO ₄/ NF）。仔细的实验和密度泛函理论计算表明，内部和外部结构工程有助于2D形态，非晶结构，导电基质和Ni-Fe混合磷酸盐的协同作用，从而导致了对OER和HER的优异电催化活性。此外，使用Am FePO ₄ / NF作为电催化剂在两个电极上组装的两电极电解槽的电流密度分别为10和100 mA cm ^-2电势分别为1.54和1.72 V，与文献中报道的最佳双功能电催化剂相当。本工作中介绍的策略可能会通过外部和内部结构控制来增强电催化性能，从而为合理设计其他3D过渡金属基电催化剂带来新的机遇。

更新日期：2017-10-25

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