一种独特的 NiOOH@FeOOH 异质结构，用于增强盐水中的氧气释放,Advanced Materials

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一种独特的 NiOOH@FeOOH 异质结构，用于增强盐水中的氧气释放
Advanced Materials ( IF 27.4 ) Pub Date : 2022-09-02 , DOI: 10.1002/adma.202108619
Bin Wu _{1,

2} , Shun Gong ₁ , Yichao Lin _{1,

2,

3} , Tao Li _{1,

4} , Anyang Chen ₁ , Mengyuan Zhao ₁ , Qiuju Zhang _{1,

2,

3} , Liang Chen _{1,

2,

3}

Affiliation

目前，开发用于低品位或盐水中析氧反应（OER）的高效非贵金属电催化剂对于大规模生产氢气具有重要意义。在这项研究中，通过使用电化学活化预处理，成功地制备了金属氧（氢氧化物）纳米片结构，该结构来源于在泡沫镍上生长的自支撑镍铁磷化物和氮化物纳米阵列，用于在盐水中进行 OER 催化。结果表明，不同的 NiOOH 和 NiOOH@FeOOH（在 FeOOH 上生长的 NiOOH）结构分别由镍-铁氮化物和磷化物在电化学活化后产生。特别是，NiOOH@FeOOH 异质结构显示出出色的电催化性能，具有 292 mV 的超低过电位，可驱动 500 mA cm 的电流密度^-2。提出了一种非常规双位点机制 (UDSM) 来解决 NiOOH@FeOOH 上的 OER 过程，并表明 FeOOH 底层在提高 NiOOH 的 OER 活性方面起着关键作用。新的可能涉及两个反应位点的UDSM对多OH层配合物的OER过程提出了不同的理解，有望指导异质结构电催化剂的设计。

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A Unique NiOOH@FeOOH Heteroarchitecture for Enhanced Oxygen Evolution in Saline Water

The development of highly efficient non-precious metal electrocatalysts for the oxygen evolution reaction (OER) in low-grade or saline water is currently of great importance for the large-scale production of hydrogen. In this study, by using an electrochemical activation pretreatment, metal oxy(hydroxide) nanosheet structures derived from self-supported nickel–iron phosphide and nitride nanoarrays grown on Ni foam are successfully fabricated for OER catalysis in saline water. It is demonstrated that the different NiOOH and NiOOH@FeOOH (NiOOH grown on FeOOH) structures are generated from nickel–iron nitride and phosphide, respectively, after electrochemical activation. In particular, the NiOOH@FeOOH heteroarchitecture shows outstanding electrocatalytic performance with an ultralow overpotential of 292 mV to drive the current density of 500 mA cm⁻². An unconventional dual-sites mechanism (UDSM) is proposed to address the OER process on NiOOH@FeOOH and show that the FeOOH underlayer plays a critical role regarding the enhanced OER activity of NiOOH. The new possible UDSM involving two reaction sites presents a different understanding of the OER process on multi-OH layer complexes, which is expected to guide the design of heteroarchitecture electrocatalysts.

更新日期：2022-09-02

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