Magnetic Heating Amorphous NiFe Hydroxide Nanosheets Encapsulated Ni Nanoparticles@Wood Carbon to Boost Oxygen Evolution Reaction Activity.
Magnetic Heating Amorphous NiFe Hydroxide Nanosheets Encapsulated Ni Nanoparticles@Wood Carbon to Boost Oxygen Evolution Reaction Activity.
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DOI：
10.1002/smll.202206798
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发表时间：
2023-04
期刊：
影响因子：
13.3
通讯作者：
Yaoxing Wang;Xueqin Fan;Qiuyu Du;Ying Shang;Xueqin Li;Zhifeng Cao;Xuanli Wang;Jian Li;Yanjun Xie;Wentao Gan
中科院分区：
文献类型：
--
作者：
Yaoxing Wang;Xueqin Fan;Qiuyu Du;Ying Shang;Xueqin Li;Zhifeng Cao;Xuanli Wang;Jian Li;Yanjun Xie;Wentao Gan
析氧反应（OER）对水分解过程和可充电金属空气电池有显着影响；然而，过渡金属催化剂的四电子转移过程导致的缓慢反应动力学阻碍了高效电化学能量转换装置的大规模商业化。在此，提出了一种具有高OER活性的低成本碳化木材的磁加热辅助增强设计，其中通过直接煅烧和电镀将Ni纳米颗粒封装在无定形NiFe氢氧化物纳米片（a-NiFe@Ni-CW）中。非晶态NiFe氢氧化物纳米片的引入优化了a-NiFe@Ni-CW的电子结构，加速了电子转移并降低了OER中的能垒。更重要的是，位于碳化木上的镍纳米粒子在交流磁场的作用下可以充当磁加热中心，进一步促进反应中间体的吸附。因此，a-NiFe@Ni-CW 在交流磁场下在 100 mA cm-2 下表现出 268 mV 的 OER 过电势，优于大多数报道的过渡金属催化剂。这项工作从可持续且丰富的木材开始，为磁场辅助下高效、低成本的电催化剂设计提供了参考。
The oxygen evolution reaction (OER) has significant effects on the water-splitting process and rechargeable metal-air batteries; however, the sluggish reaction kinetics caused by the four-electron transfer process for transition metal catalysts hinder large-scale commercialization in highly efficient electrochemical energy conversion devices. Herein, a magnetic heating-assisted enhancement design for low-cost carbonized wood with high OER activity is proposed, in which Ni nanoparticles are encapsulated in amorphous NiFe hydroxide nanosheets (a-NiFe@Ni-CW) via direct calcination and electroplating. The introduction of amorphous NiFe hydroxide nanosheets optimizes the electronic structure of a-NiFe@Ni-CW, accelerating electron transfer and reducing the energy barrier in the OER. More importantly, the Ni nanoparticles located on carbonized wood can function as magnetic heating centers under the effect of an alternating current (AC) magnetic field, further promoting the adsorption of reaction intermediates. Consequently, a-NiFe@Ni-CW demonstrated an overpotential of 268 mV at 100 mA cm-2 for the OER under an AC magnetic field, which is superior to that of most reported transition metal catalysts. Starting with sustainable and abundant wood, this work provides a reference for highly effective and low-cost electrocatalyst design with the assistance of a magnetic field.