Improving Both the Activity and Stability for the Oxygen Evolution Reaction with Bismuth Ruthenate Epitaxially Grown on Bismuth Titanate Pyrochlore
Improving Both the Activity and Stability for the Oxygen Evolution Reaction with Bismuth Ruthenate Epitaxially Grown on Bismuth Titanate Pyrochlore
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DOI：
10.1021/acsaem.2c01894
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发表时间：
2022-08
影响因子：
6.4
通讯作者：
Pierre-Yves Olu;Eiko Yokomizo;T. Kinumoto
中科院分区：
文献类型：
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作者：
Pierre-Yves Olu;Eiko Yokomizo;T. Kinumoto
分水电解槽的阳极对析氧反应(OER)需要活性、耐用的催化剂。在这里，我们研究了一种著名的活性OER催化剂Ruthenate铋焦绿石(BrO)在热氧饱和碱性反应器中的晶化机理。提出了一种溶解-再结晶机制。在此基础上，在钛酸铋焦绿石(BTO)种子纳米颗粒上外延生长了BROO。这种原始材料表现出金属导电性(>；1 S厘米-1)，用于低Ru负载(<；10wt%)。评价了BrO/BTO在酸性和碱性条件下对OER的活性和耐久性，并与无载体的BrO焦绿石和基准催化剂进行了比较。烧绿石兄弟表现出极高的OER活性，但耐久性相对较低，因此尚不适合作为OER的催化剂。更有趣的是，没有观察到活性和稳定性之间的权衡，因为在BTO上沉积BrO既提高了催化剂的活性，也提高了催化剂的耐久性。
Anodes of water-splitting electrolyzers need active and durable catalysts for the oxygen evolution reaction (OER). Herein, we investigate the crystallization mechanism of bismuth ruthenate pyrochlore (BRO), a well-known active OER catalyst, in a hot oxygen-saturated alkaline reactor. A dissolution–recrystallization mechanism is proposed. From this insight, BRO is epitaxially grown onto bismuth titanate pyrochlore (BTO) seed nanoparticles. This original material displays metallic electrical conductivity (>1 S cm–1) for a low ruthenium loading (<10 wt %). The activity and durability of BRO/BTO toward the OER in acidic and alkaline conditions are evaluated and compared to unsupported BRO pyrochlore and benchmark catalysts. Pyrochlore BRO displays exceptionally high OER activity but relatively low durability, making it not yet a suitable catalyst for the OER. More interestingly, no trade-off between the activity and stability is observed as the deposition of BRO onto BTO enhances both the activity and the durability of the catalyst.