Ultrathin nickel hydroxide nanosheets with a porous structure for efficient electrocatalytic urea oxidation,Journal of Materials Chemistry A

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Ultrathin nickel hydroxide nanosheets with a porous structure for efficient electrocatalytic urea oxidation
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2019-11-05 , DOI: 10.1039/c9ta06887b
Wenlong Yang _{1,

2,

3,

4,

5} , Xianpeng Yang _{1,

2,

3,

4,

5} , Bijun Li _{1,

2,

3,

4,

5} , Jiehua Lin _{1,

2,

3,

4,

5} , Hongtao Gao _{1,

2,

3,

4,

5} , Changmin Hou _{1,

2,

3,

4,

5} , Xiliang Luo _{1,

2,

3,

4,

5}

Affiliation

The direct urea fuel cell (DUFC) is a renewable technology for energy production, but largely limited by the intrinsically sluggish kinetics of the urea oxidation reaction (UOR) due to the complex six-electron transfer process, which severely hampers its commercial utilization. Herein, ultrathin β-Ni(OH)₂ nanosheets with a porous structure were constructed to increase both the active surface area and the reactivity of active sites of catalysts, providing great opportunities for promoting the electrocatalytic UOR process. Theoretical investigations showed that the existence of abundant pores in ultrathin β-Ni(OH)₂ nanosheets could reduce the adsorption energy of urea molecules on the catalyst surface, thus leading to a highly efficient catalytic activity for the UOR. As expected, the porous β-Ni(OH)₂ nanosheets exhibit a large current density of up to 298 mA cm⁻² at 1.82 V (vs. RHE), which is roughly 18.1 times higher than that of the nonporous β-Ni(OH)₂ nanosheets and even comparable to those of other high-performance catalysts under similar conditions. This work not only provides a promising guideline for the development of advanced UOR catalysts, but also highlights the crucial role of the porous structure in promoting the electrocatalytic UOR process.

中文翻译：

具有多孔结构的超薄氢氧化镍纳米片，用于高效电催化尿素氧化

直接尿素燃料电池（DUFC）是一种用于能源生产的可再生技术，但由于复杂的六电子转移过程，尿素氧化反应（UOR）固有的动力学迟缓，在很大程度上受到限制，这严重阻碍了其商业利用。在此，构建具有多孔结构的超薄β-Ni（OH）₂纳米片以增加催化剂的活性表面积和活性位的反应性，为促进电催化UOR工艺提供了巨大的机会。理论研究表明，超薄β-Ni（OH）_2中存在大量孔纳米片可能会降低尿素分子在催化剂表面的吸附能，从而导致UOR的高效催化活性。如所预期的，多孔的β-Ni（OH）_2个纳米片表现出高达298毫安厘米的大电流密度^-2 1.82 V（相对于RHE），其大致比无孔的β-Ni 18.1倍（ OH）₂纳米片，甚至可以在类似条件下与其他高性能催化剂相比。这项工作不仅为开发先进的UOR催化剂提供了有希望的指导，而且突出了多孔结构在促进电催化UOR过程中的关键作用。

更新日期：2019-11-05

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