Electro-oxidation of a cobalt based steel in LiOH: a non-noble metal based electro-catalyst suitable for durable water-splitting in an acidic milieu,Nanoscale

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Electro-oxidation of a cobalt based steel in LiOH: a non-noble metal based electro-catalyst suitable for durable water-splitting in an acidic milieu
Nanoscale ( IF 5.8 ) Pub Date : 2017-10-25 00:00:00 , DOI: 10.1039/c7nr06527b
Helmut Schäfer _{1,

2,

3,

4} , Karsten Küpper _{1,

2,

3,

4,

5} , Klaus Müller-Buschbaum _{4,

6,

7,

8,

9} , Diemo Daum _{4,

10,

11,

12,

13} , Martin Steinhart _{1,

2,

3,

4} , Joachim Wollschläger _{1,

2,

3,

4,

5} , Ulrich Krupp _{3,

4,

14,

15} , Mercedes Schmidt _{1,

2,

3,

4} , Weijia Han _{1,

2,

3,

4} , Johannes Stangl _{4,

6,

7,

8,

9}

Affiliation

Institute of Chemistry of New Materials and Center of Physics and Chemistry of New Materials
Universität Osnabrück
49076 Osnabrück
Germany
Department of Physics
University of Würzburg
Institute of Inorganic Chemistry
Julius-Maximilians-Universität Würzburg
D-97074 Würzburg
Faculty of Agricultural Science and Landscape Architecture
Laboratory of Plant Nutrition and Chemistry
Osnabrück University of Applied Sciences
49090 Osnabrück
Institute of Materials and Structural Integrity
University of Applied Sciences Osnabrueck

The use of proton exchange membrane (PEM) electrolyzers is the method of choice for the conversion of solar energy when frequently occurring changes of the current load are an issue. However, this technique requires electrolytes with low pH. All oxygen evolving electrodes working durably and actively in acids contain IrO_x. Due to their scarcity and high acquisition costs, noble elements like Pt, Ru and Ir need to be replaced by earth abundant elements. We have evaluated a cobalt containing steel for use as an oxygen-forming electrode in H₂SO₄. We found that the dissolving of ingredients out of the steel electrode at oxidative potential in sulfuric acid, which is a well-known, serious issue, can be substantially reduced when the steel is electro-oxidized in LiOH prior to electrocatalysis. Under optimized synthesis conditions a cobalt-containing tool steel was rendered into a durable oxygen evolution reaction (OER) electrocatalyst (weight loss: 39 μg mm⁻² after 50 000 s of chronopotentiometry at pH 1) that exhibits overpotentials down to 574 mV at 10 mA cm⁻² current density at pH 1. Focused ion beam SEM (FIB-SEM) was successfully used to create a structure–stability relationship.

中文翻译：

LiOH中钴基钢的电氧化：一种非贵金属基电催化剂，适合在酸性环境中进行持久的水分解

当电流负载的频繁发生变化成为问题时，质子交换膜（PEM）电解器的使用是太阳能转换的首选方法。然而，该技术需要低pH的电解质。在酸中持久且活跃地工作的所有析氧电极均含有IrO _x。由于它们的稀缺性和高昂的购置成本，贵重元素如Pt，Ru和Ir需要替换为富含地球的元素。我们已经评估了用作H ₂ SO _4中氧形成电极的含钴钢。我们发现，在电催化之前在LiOH中对钢进行电氧化时，可以显着减少在氧化电位下在硫酸中从钢电极溶出的成分，这是一个众所周知的严重问题。在优化的合成条件下，将含钴的工具钢制成耐久的氧气析出反应（OER）电催化剂（在pH 1的5万秒后，重量损失：39μgmm ^-2，在10 000 s的计时电位法下），在10时表现出低至574 mV的超电势pH 1时的电流密度为mA cm ^-2。聚焦离子束SEM（FIB-SEM）已成功用于建立结构与稳定性的关系。

更新日期：2017-11-23

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