Particle size-controlled synthesis of high-performance MnCo-based materials for alkaline OER at fluctuating potentials

Broicher Cornelia; Klingenhof Malte; Frisch MarvinDresp SoerenKubo Nikolas MaoArtz JensRadnik JoergPalkovits StefanBeine Anna KatharinaStrasser PeterPalkovits Regina

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Particle size-controlled synthesis of high-performance MnCo-based materials for alkaline OER at fluctuating potentials

机译：粒子size-controlled合成高性能MnCo-based材料碱性OER在波动的潜力

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For the large-scale generation of hydrogen via water electrolysis the design of long term stable and active catalysts for the oxygen evolution reaction (OER) remains a key challenge. Most catalysts suffer from severe structural corrosion that becomes even more pronounced at fluctuating potentials. Herein, MnCo based cubic particles were prepared via a hydrothermal approach, in which the edge length of the micron-sized particles can be controlled by changing the pH value of the precursor solution. The cubes are composed of varying amounts of MnCo2O4, CoCO3 and a mixed (Mn/Co)CO3 phase. Structure-activity relationships were deduced revealing a volcano-type behavior for the intrinsic OER activity and fraction of spinel oxide phase. A low overpotential of 0.37 V at 10 mA cm(-2) and a stability of more than 25 h was achieved in 1.0 M KOH using a rotating disc electrode (RDE) setup. The best performing catalyst material was successfully tested under dynamic process conditions for 9.5 h and shows a superior catalytic activity as anode for the overall water splitting in an electrolyser setup in 1.0 M KOH at 333 K compared to a reference NiCo-spinel catalyst.

机译：为大规模代氢通过电解水的设计长期稳定和活跃的催化剂氧进化反应(OER)仍然是一个关键的挑战。患有严重的催化剂结构腐蚀在波动变得更加明显潜力。通过水热的方法,准备在吗微米大小的边缘长度粒子可以通过改变pH值控制前体的解决方案的价值。由不同数量的MnCo2O4 CoCO3和混合(Mn / Co)二氧化碳阶段。关系推导出了volcano-type内在OER的行为活动和分数的尖晶石氧化物阶段。过电压低0.37 V(2)和马10厘米超过25小时的稳定性是1.0米KOH使用旋转圆盘电极(RDE)设置。表现最佳的催化剂材料成功测试了在动态过程9.5 h,显示了优越的条件催化活性的阳极总体水分裂的电解槽设置1.0 KOH在333 K相比NiCo-spinel的引用催化剂。

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《Catalysis science & technology》 |2021年第22期|7278-7286|共10页
作者
Broicher Cornelia; Klingenhof Malte; Frisch MarvinDresp SoerenKubo Nikolas MaoArtz JensRadnik JoergPalkovits StefanBeine Anna KatharinaStrasser PeterPalkovits Regina;
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作者单位

BAM, Bundesanstalt Mat Forsch & Prufung, Unter Eichen 44-46, D-12203 Berlin, Germany;

Rhein Westfal TH Aachen, Inst Tech & Macromol Chem, Worringerweg 2, D-52074 Aachen, Germany;

Max Planck Inst Chem Energy Convers, Stiftstr 34-36, D-45470 Mulheim, GermanyTech Univ Berlin, Dept Chem, Chem & Mat Engn Div, Str 17 Juni 124, D-10623 Berlin, Germany;

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原文格式 PDF
正文语种英语
中图分类汉语教学;
关键词
PH; transient processes; Groundwater flowCatalyst materialsCatalystsElectrolysed waterCatalyst activity;

机译：PH值;瞬态过程;地下水flowCatalystmaterialsCatalystsElectrolysed waterCatalyst活动;

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Particle size-controlled synthesis of high-performance MnCo-based materials for alkaline OER at fluctuating potentials

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