Phase segregated Cu2−xSe/Ni3Se4 bimetallic selenide nanocrystals formed through the cation exchange reaction for active water oxidation precatalysts,Chemical Science

当前位置： X-MOL 学术 › Chem. Sci. › 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.)

Phase segregated Cu2−xSe/Ni3Se4 bimetallic selenide nanocrystals formed through the cation exchange reaction for active water oxidation precatalysts
Chemical Science ( IF 7.6 ) Pub Date : 2019/12/19 , DOI: 10.1039/c9sc04371c
Sungwon Kim _{1,

2,

3,

4,

5} , Hiroki Mizuno _{1,

2,

3,

4,

5} , Masaki Saruyama _{3,

4,

5,

6} , Masanori Sakamoto _{3,

4,

5,

6} , Mitsutaka Haruta _{3,

4,

5,

6} , Hiroki Kurata _{3,

4,

5,

6} , Taro Yamada _{5,

7,

8,

9} , Kazunari Domen _{5,

7,

8,

9} , Toshiharu Teranishi _{3,

4,

5,

6}

Affiliation

Control over the composition and nanostructure of solid electrocatalysts is quite important for drastic improvement of their performance. The cation exchange reaction of nanocrystals (NCs) has been reported as the way to provide metastable crystal structures and complicated functional nanostructures that are not accessible by conventional synthetic methods. Herein we demonstrate the cation exchange-derived formation of metastable spinel Ni₃Se₄ NCs (sp-Ni₃Se₄) and phase segregated berzelianite Cu_2−xSe (ber-Cu_2−xSe)/sp-Ni₃Se₄ heterostructured NCs as active oxygen evolution reaction (OER) catalysts. A rare sp-Ni₃Se₄ phase was formed by cation exchange of ber-Cu_2−xSe NCs with Ni²⁺ ions, because both phases have the face-centered cubic (fcc) Se anion sublattice. Tuning the Ni : Cu molar ratio leads to the formation of Janus-type ber-Cu_2−xSe/sp-Ni₃Se₄ heterostructured NCs. The NCs of sp-Ni₃Se₄ and ber-Cu_2−xSe/sp-Ni₃Se₄ heterostructures exhibited high catalytic activities in the OER with small overpotentials of 250 and 230 mV at 10 mA cm⁻² in 0.1 M KOH, respectively. They were electrochemically oxidized during the OER to give hydroxides as the real active species. We anticipate that the cation exchange reaction could have enormous potential for the creation of novel heterostructured NCs showing superior catalytic performance.

中文翻译：

通过阳离子交换反应形成活性水氧化前催化剂的相分离Cu2-xSe / Ni3Se4双金属硒化物纳米晶体

控制固体电催化剂的组成和纳米结构对于大幅提高其性能非常重要。纳米晶体（NCs）的阳离子交换反应已被报道为提供亚稳晶体结构和复杂的功能性纳米结构的方法，而常规合成方法无法获得这种结构。在这里，我们证明了亚稳态尖晶石Ni ₃ Se ₄ NCs（sp-Ni ₃ Se ₄）和相分离的绿铅矿Cu _{2− x} Se（ber-Cu _{2− x} Se）/ sp-Ni ₃ Se ₄的阳离子交换衍生形成。异结构NC作为活性氧释放反应（OER）催化剂。稀有的sp-Ni ₃ Se ₄相是通过ber-Cu ₂ - _x Se NCs与Ni ²⁺离子的阳离子交换而形成的，因为这两个相都具有面心立方（fcc）Se阴离子亚晶格。调整Ni：Cu摩尔比会导致形成Janus型ber-Cu _{2− x} Se / sp-Ni ₃ Se ₄异质结构NC。sp-Ni ₃ Se ₄和ber-Cu _{2− x} Se / sp-Ni ₃ Se ₄的NCs异质结构在OER中表现出高催化活性，在0.1 M KOH中的10 mA cm ^-2下分别具有250和230 mV的小过电势。它们在OER期间被电化学氧化，得到氢氧化物作为真正的活性物质。我们预计，阳离子交换反应可能具有巨大的潜力，可以创建具有优异催化性能的新型异质结构NC。

更新日期：2020-02-13

点击分享查看原文

点击收藏

公开下载

阅读更多本刊最新论文本刊介绍/投稿指南11