Co3O4/Fe0.33Co0.66P Interface Nanowire for Enhancing Water Oxidation Catalysis at High Current Density,Advanced Materials

当前位置： X-MOL 学术 › Adv. Mater. › 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.)

Co3O4/Fe0.33Co0.66P Interface Nanowire for Enhancing Water Oxidation Catalysis at High Current Density
Advanced Materials ( IF 27.4 ) Pub Date : 2018-09-25 , DOI: 10.1002/adma.201803551
Xiaoyan Zhang _{1,

2,

3} , Jing Li _{1,

2} , Yong Yang ₃ , Shan Zhang _{1,

2,

3} , Haishuang Zhu _{1,

2} , Xiaoqing Zhu _{1,

2} , Huanhuan Xing _{1,

2} , Yelong Zhang ₃ , Bolong Huang ₄ , Shaojun Guo _{3,

5} , Erkang Wang _{1,

2}

Affiliation

Designing well‐defined nanointerfaces is of prime importance to enhance the activity of nanoelectrocatalysts for different catalytic reactions. However, studies on non‐noble‐metal‐interface electrocatalysts with extremely high activity and superior stability at high current density still remains a great challenge. Herein, a class of Co₃O₄/Fe_0.33Co_0.66P interface nanowires is rationally designed for boosting oxygen evolution reaction (OER) catalysis at high current density by partial chemical etching of Co(CO₃)_0.5(OH)·0.11H₂O (Co‐CHH) nanowires with Fe(CN)₆³⁻, followed by low‐temperature phosphorization treatment. The resulting Co₃O₄/Fe_0.33Co_0.66P interface nanowires exhibit very high OER catalytic performance with an overpotential of only 215 mV at a current density of 50 mA cm⁻² and a Tafel slope of 59.8 mV dec⁻¹ in 1.0 m KOH. In particular, Co₃O₄/Fe_0.33Co_0.66P exhibits an obvious advantage in enhancing oxygen evolution at high current density by showing an overpotential of merely 291 mV at 800 mA cm⁻², much lower than that of RuO₂ (446 mV). Co₃O₄/Fe_0.33Co_0.66P is remarkably stable for the OER with negligible current loss under overpotentials of 200 and 240 mV for 150 h. Theoretical calculations reveal that Co₃O₄/Fe_0.33Co_0.66P is more favorable for the OER since the electrochemical catalytic oxygen evolution barrier is optimally lowered by the active Co‐ and O‐sites from the Co₃O₄/Fe_0.33Co_0.66P interface.

中文翻译：

Co3O4 / Fe0.33Co0.66P界面纳米线，用于增强高电流密度下的水氧化催化作用

设计定义明确的纳米界面对于增强纳米电催化剂在不同催化反应中的活性至关重要。然而，对在高电流密度下具有极高活性和优异稳定性的非贵金属界面电催化剂的研究仍然是一个巨大的挑战。在此，合理设计了一类Co ₃ O ₄ / Fe _0.33 Co _0.66 P界面纳米线，用于通过对Co（CO ₃）_0.5（OH）·0.11H进行部分化学刻蚀来提高高电流密度下的析氧反应（OER）催化作用。₂ O（Co-CHH）纳米线与Fe（CN）₆³⁻，然后进行低温磷化处理。所得的Co ₃ O ₄ / Fe _0.33 Co _0.66 P界面纳米线表现出非常高的OER催化性能，在50 mA cm ^-2的电流密度下的超电势仅为215 mV，在1.0 m内的Tafel斜率为59.8 mV dec ^-1 KOH。尤其是，Co ₃ O ₄ / Fe _0.33 Co _0.66 P在800 mA cm ^-2时仅显示291 mV的过电势，远低于RuO ₂（446 mV）的过电势，在提高高电流密度下的氧气_释放方面具有明显的优势。）。有限公司₃ O ₄ / Fe _0.33 Co _0.66 P对于OER非常稳定，在200和240 mV的超电势下持续150 h的电流损耗可忽略不计。理论计算表明，Co ₃ O ₄ / Fe _0.33 Co _0.66 P对OER更有利，因为通过Co ₃ O ₄ / Fe _0.33 Co _0.66的活性Co-和O-位点可以最佳地降低电化学催化氧放出势垒P接口。

更新日期：2018-09-25

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11