Self-supported CoFe LDH/Co0.85Se nanosheet arrays as efficient electrocatalysts for the oxygen evolution reaction†,Catalysis Science & Technology

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Self-supported CoFe LDH/Co0.85Se nanosheet arrays as efficient electrocatalysts for the oxygen evolution reaction†
Catalysis Science & Technology ( IF 4.4 ) Pub Date : 2019-09-04 , DOI: 10.1039/c9cy01440c
Weiyang Jin _{1,

2,

3,

4,

5} , Fang Liu _{1,

2,

3,

4,

5} , Xiaoliang Guo _{1,

2,

3,

4,

5} , Jun Zhang _{1,

2,

3,

4,

5} , Lekai Zheng _{1,

2,

3,

4,

5} , Yongchuan Hu _{1,

2,

3,

4,

5} , Jing Mao _{6,

7,

8,

9,

10} , Hui Liu _{1,

2,

3,

4} , Yanming Xue _{1,

2,

3,

4,

5} , Chengchun Tang _{1,

2,

3,

4,

5}

Affiliation

The exploration of high-performance, cost-effective, and stable electrocatalysts for the oxygen evolution reaction (OER) is crucial for future energy storage and conversion technologies. Cobalt-based hydroxides and oxides have been considered as ideal OER electrocatalysts and have been intensively studied; however, their catalytic activity is still unsatisfactory. It is known that the interfacial electron and structure engineering of composite electrocatalysts often results in synergistically enhanced catalytic performance. Herein, a self-supported binary heterogeneous catalyst composed of CoFe LDH/Co_0.85Se nanosheet arrays vertically grown on carbon cloth has been reported. The heterostructure electrocatalyst exhibits excellent activity for the OER in alkaline electrolyte, requiring an overpotential of only 241 mV at a current density of 10 mA cm⁻² with a small Tafel slope of 48 mV dec⁻¹. These performances are significantly better than those of the bare CoFe LDH and Co_0.85Se catalysts. Moreover, the composite electrodes exhibit outstanding durability within 40 h of testing. Our further electrochemical results show that the excellent activities of the heterostructure electrodes should be ascribed to the interfacial coupling effect, increased number of activity sites, accelerated electron transfer, and strong structural stability. This work paves an interesting route for boosting the OER performance of oxide-based electrocatalysts by the regulation of electronic structure through introducing non oxide electrocatalysts for various applications.

中文翻译：

自支撑的CoFe LDH / Co _0.85 Se纳米片阵列作为氧释放反应的有效电催化剂†

探索用于氧气释放反应（OER）的高性能，经济高效且稳定的电催化剂对于未来的能量存储和转换技术至关重要。钴基氢氧化物和氧化物被认为是理想的OER电催化剂，并已进行了深入研究。但是，它们的催化活性仍然不能令人满意。已知复合电催化剂的界面电子和结构工程常常导致协同增强的催化性能。本文中，由CoFe LDH / Co _0.85组成的自负载二元非均相催化剂已经报道了在碳布上垂直生长的硒纳米片阵列。异质结构电催化剂对碱性电解质中的OER表现出优异的活性，在10 mA cm ^-2的电流密度和48 mV dec ^-1的小Tafel斜率下，仅需241 mV的过电势。这些性能明显优于裸露的CoFe LDH和Co _0.85硒催化剂。此外，复合电极在测试的40小时内表现出出色的耐久性。我们的进一步电化学结果表明，异质结构电极的出色活性应归因于界面耦合效应，活性位点数量的增加，电子转移的加速以及结构的稳定性。这项工作为通过引入各种用途的非氧化物电催化剂来调节电子结构，为提高氧化物基电催化剂的OER性能开辟了一条有趣的途径。

更新日期：2019-10-14

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