Phytic acid-modified NiFe-PBA stacked by π–π force for reinforcement electrocatalytic water oxidation†

IF 6.1 1区化学 Q1 CHEMISTRY, INORGANIC & NUCLEAR

Inorganic Chemistry Frontiers Pub Date : 2024-09-18 DOI:10.1039/D4QI01520G

Zheng Ye, Chun Han, Yuan Yuan, Gong Chen, Yuanzun Fu and Yunhe Zhao

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Abstract

Prussian blue analogues (PBAs) with a unique three-dimensional (3D) open metal framework structure and easily adjustable composition have been widely used in the oxygen evolution reaction (OER) under alkaline conditions. Herein, disintegrative PA-tPBA/NF (d-PA-tPBA/NF) was prepared by an ion-exchange reaction, phytic acid (PA) etching and mild thermal activation using Ni(OH)₂ layered nanosheets loaded on nickel foam (NF) as a precursor. Due to the optimization of the NiFe-PBA@Ni(OH)₂ heterostructure and π–π stacking force on the electron transfer structure, a stable high-speed charge transfer channel has been successfully constructed. Therefore, the OER overpotential required to transport 10 mA cm⁻² is only 250 mV, especially with a significant Tafel slope of 47.9 mV dec⁻¹. Furthermore, the d-PA-tPBA/NF||d-PA-tPBA/NF system achieved a current density of 10 mA cm⁻² with a cell voltage of only 1.55 V. This study provides a promising strategy for exploring efficient OER electrocatalysts derived from PBAs.

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利用π-π力堆叠的植酸改性 NiFe-PBA，以增强电催化水氧化能力

普鲁士蓝类似物（PBAs）具有独特的三维（3D）开放式金属框架结构和易于调节的成分，已被广泛应用于碱性条件下的氧进化反应（OER）。本文以负载在泡沫镍（NF）上的层状纳米片 Ni(OH)2 为前驱体，通过离子交换反应、植酸（PA）蚀刻和温和的热活化制备了分解型 PA-tPBA/NF（d-PA-tPBA/NF）。由于对 NiFe-PBA@Ni(OH)2 异质结构和电子转移结构上的π-π堆积力进行了优化，成功构建了稳定的高速电荷转移通道。因此，传输 10 mA cm-2 所需的 OER 过电位仅为 250 mV，尤其是 Tafel 斜率高达 47.9 mV dec-1。此外，d-PA-tPBA/NF||d-PA-tPBA/NF 系统在电池电压仅为 1.55 V 的情况下实现了 10 mA cm-2 的电流密度。

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