Yttrium- and Cerium-Codoped Ultrathin Metal–Organic Framework Nanosheet Arrays for High-Efficiency Electrocatalytic Overall Water Splitting,Nano Letters

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Yttrium- and Cerium-Codoped Ultrathin Metal–Organic Framework Nanosheet Arrays for High-Efficiency Electrocatalytic Overall Water Splitting
Nano Letters ( IF 9.6 ) Pub Date : 2022-08-30 , DOI: 10.1021/acs.nanolett.2c02755
Fajun Li _{1,

2} , Minghang Jiang _{1,

3,

4} , Changgan Lai ₅ , Haifeng Xu ₆ , Keying Zhang ₂ , Zhong Jin _{1,

3,

4}

Affiliation

The construction of low-cost, highly efficient, and stable electrocatalysts is a significant challenge for the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). Herein, we report a facile strategy to fabricate ultrathin metal–organic framework (MOF) nanosheet arrays doped with two rare-earth elements, Y and Ce, and self-supported on nickel foam (NF) to enhance the HER and OER performance by constructing abundant active sites and bimetallic synergistic effects. The NiYCe-MOF/NF features an ultrathin nanosheet array structure and is uniformly and richly codoped by Y and Ce. When it was explored as both the anode and cathode electrocatalysts for overall water splitting, it achieved 10 mA cm^–2 at 136 and 245 mV for the HER and OER in an alkaline electrolyte, respectively. Notably, an extremely low cell voltage of 1.54 V was required to achieve 100 mA cm^–2 in 1.0 M KOH solution, making it a promising substitute for noble-metal catalysts.

中文翻译：

用于高效电催化整体水分解的钇和铈共掺杂超薄金属-有机框架纳米片阵列

构建低成本、高效、稳定的电催化剂是析氢反应（HER）和析氧反应（OER）面临的重大挑战。在这里，我们报告了一种简单的策略来制造掺杂两种稀土元素 Y 和 Ce 并在镍泡沫 (NF) 上自支撑的超薄金属有机框架 (MOF) 纳米片阵列，以通过构建增强 HER 和 OER 性能丰富的活性位点和双金属协同效应。NiYCe-MOF/NF 具有超薄纳米片阵列结构，并由 Y 和 Ce 均匀且丰富地共掺杂。当它被探索为用于整体水分解的阳极和阴极电催化剂时，它达到了 10 mA cm ^–2对于碱性电解质中的 HER 和 OER，分别为 136 和 245 mV。^{值得注意的是，在 1.0 M KOH 溶液中实现 100 mA cm -2}需要 1.54 V 的极低电池电压，使其成为贵金属催化剂的有希望的替代品。

更新日期：2022-08-30

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