Trace tungsten and iron-doped nickel hydroxide nanosheets for an efficient oxygen evolution reaction,Sustainable Energy & Fuels

当前位置： X-MOL 学术 › Sustain. Energy Fuels › 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.)

Trace tungsten and iron-doped nickel hydroxide nanosheets for an efficient oxygen evolution reaction
Sustainable Energy & Fuels ( IF 5.0 ) Pub Date : 2020-03-16 , DOI: 10.1039/d0se00205d
Chun Li _{1,

2,

3,

4,

5} , Peng Tian _{1,

2,

3,

4,

5} , Hongchang Pang _{1,

2,

3,

4,

5} , Weitao Gong _{1,

2,

3,

4,

5} , Junwei Ye _{1,

2,

3,

4,

5} , Guiling Ning _{1,

2,

3,

4,

5}

Affiliation

Fe_xNi_1−x(O)OH has been proven to be an efficient, earth-abundant and nonprecious catalyst for the oxygen evolution reaction (OER). However, the weak binding of oxygenated intermediates and the exposure of a few active sites on NiFe hydroxides considerably hinder their catalytic activity. Based on the fact that the W⁶⁺ ions possess higher valency. and similar ionic radius with respect to the Fe²⁺, Fe³⁺, and Ni²⁺ ions, which can modulate the (NiO₆) crystal structure and enhance the interaction of block electrons, we have tried to introduce a trace amount of W⁶⁺ into Fe_xNi_1−x(O)OH. To our surprise, the target product Fe_0.03W_0.03–Ni LDH^B exhibited the lowest overpotential of 205(±3) mV at 10 mA cm⁻², Tafel slope of 60 mV dec⁻¹, and no obvious decrease in the electrocatalytic activity after more than 50 hour operation or 3000 cyclic voltammetry cycles. X-ray diffraction, Raman spectroscopy, UV-Vis spectroscopy, X-ray photoelectron spectroscopy and electrochemical studies revealed a synergistic interplay among tungsten, iron and nickel for producing a favorable local coordination environment and electronic structure, which enhanced the OER performance.

中文翻译：

痕量钨和铁掺杂的氢氧化镍纳米片用于有效的氧气释放反应

Fe _x Ni _{1- x}（O）OH已被证明是用于氧释放反应（OER）的高效，富地球且非贵重的催化剂。但是，含氧中间体的弱结合以及NiFe氢氧化物上一些活性位点的暴露大大阻碍了它们的催化活性。基于W ⁶⁺离子具有更高的化合价的事实。对于Fe 2 ⁺，Fe ³⁺和Ni ²⁺离子具有相似的离子半径，可以调节（NiO ₆）晶体结构并增强嵌段电子的相互作用，我们尝试引入痕量的W ⁶⁺转变为Fe _x Ni _1−x（O）OH。令我们惊讶的是，目标产物Fe_0.03 W_0.03 –Ni LDH^B在10 mA cm^-2时表现出最低的205（±3）mV过电位，Tafel斜率为decm^-¹的60 mV，并且电催化活性没有明显降低经过超过50小时的操作或3000次循环伏安法循环后。X射线衍射，拉曼光谱，UV-Vis光谱，X射线光电子能谱和电化学研究表明，钨，铁和镍之间存在协同作用，从而产生了良好的局部配位环境和电子结构，从而提高了OER性能。

更新日期：2020-03-16

点击分享查看原文

点击收藏

阅读更多本刊最新论文