当前位置:
X-MOL 学术
›
Chem. Eng. J.
›
论文详情
Our official English website, www.x-mol.net, welcomes your
feedback! (Note: you will need to create a separate account there.)
用于碱性介质中高效析氢反应的 Ni/NiFe 层状双氧化物二维异质纳米结构电催化剂
Chemical Engineering Journal
(
IF
13.3
)
Pub Date : 2021-08-15
, DOI:
10.1016/j.cej.2021.131827
Yakun Tian
1
,
Aijian Huang
2,
3
,
Zhiguo Wang
2
,
Mingkui Wang
4
,
Qingsheng Wu
1
,
Yan Shen
4
,
Quanjing Zhu
1
,
Yongqing Fu
5
,
Ming Wen
1
Affiliation
- School of Chemical Science and Engineering, Shanghai Key Laboratory of Chemical Assessment and Sustainability, Tongji University, Shanghai 200092, China
- School of Electronics Science and Engineering, University of Electronic Science and Technology of China, Chengdu 610054, China
- Department of Chemistry, Tsinghua University, Beijing 100084, China
- Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China
- Faculty of Engineering and Environment, Northumbria University, Newcastle Upon Tyne NE99, UK
高性能、经济高效且稳定的电催化剂对于通过在碱性介质中分解水的析氢反应 (HER) 至关重要。通过相变和受控原位还原过程,在泡沫镍 (NF) 上成功构建了一种独特的异质纳米结构 Ni/NiFe 层状双氧化物 (Ni/NiFe-LDO) 。由于 NiFe-LDO 纳米片的二维 (2D) 形貌可以稳定原位形成的均匀纳米 Ni 位点,因此在 NF 上制备的 Ni/NiFe-LDO 在 1.0 M KOH 溶液中对 HER 显示出高催化活性,这需要29 mV 的极低过电位可提供 10 mA cm -2的电流密度,实现 82 mV dec -1的 Tafel 斜率并在至少24小时内保持极好的电解稳定性。详细表征表明,纳米镍和镍铁-LDO 纳米片之间的协同效应有助于显着的 HER 活性。在NiFe-LDO中,Fe 2 O 3促进了H 2 O在Ni-Fe 2 O 3界面区域的吸附,有利于水的活化,然后NiO为羟基吸附(*OH)提供了活性位点,同时纳米镍位点对吸附氢中间体 (H*) 具有活性。以上所有都加速了Volmer-step反应中的水离解。
"点击查看英文标题和摘要"
Two-dimensional Hetero-nanostructured Electrocatalyst of Ni/NiFe-layered double oxide for Highly Efficient Hydrogen Evolution Reaction in Alkaline Medium
High-performance, cost-effective and stable electrocatalysts are critical for hydrogen evolution reaction (HER) via water splitting in alkaline media. Herein a unique hetero-nanostructured Ni/NiFe-layered double oxide (Ni/NiFe-LDO) on Ni foam (NF) has been successfully constructed through phase-transition and controlled in-situ reduction process. Because the two-dimensional (2D) morphology of NiFe-LDO nanosheets can stabilize uniform in-situ formed nano-Ni sites, the prepared Ni/NiFe-LDO on NF displays a high catalytic activity for HER in 1.0 M KOH solution, which requires an extremely low overpotential of 29 mV to afford a current density at 10 mA cm-2, achieves a Tafel slope of 82 mV dec-1 and maintains an excellent stability of electrolysis for at least 24 hours. Detail characterizations reveal that the synergistic effect between nano-Ni and NiFe-LDO nanosheets contributes to the prominent HER activity. In NiFe-LDO, Fe2O3 facilitates the adsorption of H2O on the interface region of Ni-Fe2O3, which is beneficial for water activation, then NiO offers the active sites for hydroxyl adsorption (*OH), meanwhile nano-Ni sites are active to adsorb hydrogen intermediates (H*). All of the above accelerates the water dissociation in Volmer-step reaction.
更新日期:2021-08-15