奥斯特瓦尔德（Ostwald）熟化对氢氧化镍纳米片的缺陷工程，以增强选择性电催化醇氧化,Green Chemistry

当前位置： X-MOL 学术 › Green Chem. › 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.)

奥斯特瓦尔德（Ostwald）熟化对氢氧化镍纳米片的缺陷工程，以增强选择性电催化醇氧化
Green Chemistry ( IF 9.3 ) Pub Date : 2018-12-20 , DOI: 10.1039/c8gc03451f
Xianlang Chen _{1,

2,

3,

4,

5} , Xing Zhong _{1,

2,

3,

4,

5} , Bowen Yuan _{1,

2,

3,

4,

5} , Suiqin Li _{1,

2,

3,

4,

5} , Yongbing Gu _{1,

2,

3,

4,

5} , Qiaoqiao Zhang _{1,

2,

3,

4,

5} , Guilin Zhuang _{1,

2,

3,

4,

5} , Xiaonian Li _{1,

2,

3,

4,

5} , Shengwei Deng _{1,

2,

3,

4,

5} , Jian-guo Wang _{1,

2,

3,

4,

5}

Affiliation

醇向醛或酸的选择性电催化氧化（ECO）是现代工业中一种环保且经济的方法。在此，成功地通过奥斯特瓦尔德（Ostwald）熟化工艺在氢氧化镍（h-Ni（OH）₂）中制备了可调节的孔和空位，并将所制备的电催化剂用于醇的选择性ECO转化为酸和醛，具有优异的电催化活性和稳定性，其中在1.0 h-Ni（OH）₂上苯甲酸的选择性高于92％，苯甲醇的转化率为99％，而苯甲醛的选择性> 94％，转化率> 90％一旦达到2,2,6,6-四甲基哌啶-N使用-氧基（TEMPO）自由基。采用配对电解系统，分别使用1.0 h-Ni（OH）₂和1.0 PtO ₂ / h-Ni（OH）₂作为阳极和阴极的电催化剂，以同时实现苄醇的选择性ECO和H _2的生产，法拉第效率高达192.9％。优异的ECO活性主要归因于大量的空穴和空位，这些空位和空位有利于反应物种的扩散速率，调节h-Ni（OH）₂的电子结构和表面性质，并改变苄醇周围的电荷密度，从而提高了醇的吸附能。这项研究为理解和未来设计用于电子合成和能量转换的基于缺陷的高级电催化剂提供了新途径。

"点击查看英文标题和摘要"

Defect engineering of nickel hydroxide nanosheets by Ostwald ripening for enhanced selective electrocatalytic alcohol oxidation

Selective electrocatalytic oxidation (ECO) of alcohols to aldehydes or acids is an environmentally friendly and economical method in modern industries. Herein, tunable holes and vacancies in nickel hydroxide (h-Ni(OH)₂) by the Ostwald ripening process are successfully fabricated, and the as-prepared electrocatalysts are used for the selective ECO of alcohols into acids or aldehydes with excellent electrocatalytic activity and stability, where a selectivity above 92% to benzoic acid with a benzyl alcohol conversion of 99% on 1.0 h-Ni(OH)₂ was obtained, while a selectivity of >94% to benzaldehyde with a conversion of >90% could also be achieved once the 2,2,6,6-tetramethylpiperidine-N-oxyl (TEMPO) radical was employed. A paired electrolysis system is employed using 1.0 h-Ni(OH)₂ and 1.0 PtO₂/h-Ni(OH)₂ as electrocatalysts at the anode and cathode, respectively, to simultaneously achieve the selective ECO of benzyl alcohol and H₂ production, resulting in a high faradaic efficiency of 192.9%. The excellent ECO activity is mainly due to the abundance of holes and vacancies which facilitate the diffusion rate of the reaction species, adjust the electronic structure and surface properties of h-Ni(OH)₂, and change the charge density around benzyl alcohol, thereby enhancing the adsorption energy of the alcohol. This study introduces a new avenue for the understanding and future design of advanced defect-based electrocatalysts for electrosynthesis and energy conversion.

更新日期：2019-02-05

点击分享查看原文

点击收藏

阅读更多本刊新发论文本刊介绍/投稿指南