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Boosting the Stability of RuO2 in the Acidic Oxygen Evolution Reaction by Tuning Oxygen‐Vacancy Formation Energies: A Viable Approach Beyond Noble‐Metal Catalysts?
ChemElectroChem ( IF 4 ) Pub Date : 2020-12-16 , DOI: 10.1002/celc.202001465
Kai S. Exner 1, 2
Affiliation  

RuO2 belongs to the most active electrode materials for the anodic oxygen evolution reaction (OER) within the electrochemical water splitting, such as those encountered in acidic proton‐exchange membrane (PEM) electrolyzers. Despite its large activity, RuO2 faces severe stability issues under the harsh anodic operation conditions. Now, a new strategy has been reported to overcome this bottleneck by tuning the free‐formation energy of oxygen vacancies, which can be achieved by the co‐doping of W and Er into the RuO2 lattice. The resulting W0.2Er0.1Ru0.7O2‐δ electrocatalyst is stable long term in acid and, additionally, reveals remarkable OER activity, about 30 times higher than that of commercial RuO2. The notion of tuning the oxygen‐vacancy formation energy could be a valuable starting point for the development of non‐noble electrocatalysts for the acidic OER with applications in PEM electrolyzers.

中文翻译:

通过调节氧空位形成能来提高酸性氧释放反应中RuO2的稳定性:一种超越贵金属催化剂的可行方法?

RuO 2属于电化学水分解中用于阳极氧发生反应(OER)的活性最高的电极材料,例如酸性质子交换膜(PEM)电解槽中遇到的那些材料。尽管RuO 2具有大量活性,但在苛刻的阳极操作条件下仍面临严重的稳定性问题。现在,已经报道了通过调整氧空位的自由形成能来克服这一瓶颈的新策略,这可以通过将W和Er共掺杂到RuO 2晶格中来实现。所得的W 0.2 Er 0.1 Ru 0.7 O2 该电催化剂在酸中长期稳定,此外,它还具有显着的OER活性,约为商业RuO 2的30倍。调节氧空位形成能的想法可能是开发用于酸性OER的非贵金属电催化剂并应用于PEM电解槽的宝贵起点。
更新日期:2021-01-04
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