Mn-Doped RuO2 Nanocrystals as Highly Active Electrocatalysts for Enhanced Oxygen Evolution in Acidic Media,ACS Catalysis

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Mn-Doped RuO2 Nanocrystals as Highly Active Electrocatalysts for Enhanced Oxygen Evolution in Acidic Media
ACS Catalysis ( IF 11.3 ) Pub Date : 2019-12-30 , DOI: 10.1021/acscatal.9b04922
Shi Chen ₁ , Hao Huang ₁ , Peng Jiang ₁ , Kang Yang ₁ , Jiefeng Diao ₁ , Shipeng Gong ₁ , Shuai Liu ₁ , Minxue Huang ₁ , Hui Wang ₂ , Qianwang Chen _{1,

2}

Affiliation

Currently, RuO₂ is a benchmark acidic oxygen evolution reaction (OER) catalyst. Nevertheless, its wide applications are always restricted by slow dynamics and limited durability. This paper reports a type of Mn-doped RuO₂ nanocrystals for boosting the OER catalytic performance in acidic media. The catalyst (named Mn-RuO₂) is prepared through annealing of Ru-exchanged Mn-based derivative at 300 °C. Such Mn-RuO₂ exhibits excellent acidic OER activity, with an overpotential of 158 mV at 10 mA cm^–2 and a stability of 5000 cycles in the presence of sulfuric acid (0.5 mol/L). Both structural characterization and theoretical analysis show that the Mn doping in RuO₂ can tune the d-band center of Ru active sites and lower antibonding surface-adsorbate states, which leads to a decreased free energy of the rate-determining step, ultimately enhancing the intrinsic activity of RuO₂.

中文翻译：

Mn掺杂RuO ₂纳米晶体作为高活性电催化剂，可增强酸性介质中的氧气释放

当前，RuO ₂是基准酸性氧释放反应（OER）催化剂。然而，其广泛的应用总是受到缓慢的动力学和有限的耐久性的限制。本文报道了一种用于增强酸性介质中OER催化性能的Mn掺杂RuO ₂纳米晶体。通过将Ru交换的Mn基衍生物在300℃下退火来制备催化剂（称为Mn-RuO ₂）。此类Mn-RuO ₂表现出出色的酸性OER活性，在10 mA cm ^–2下具有158 mV的过电势，在硫酸（0.5 mol / L）的存在下具有5000个循环的稳定性。结构表征和理论分析均表明，RuO ₂中的Mn掺杂可以调节Ru活性位点的d带中心和较低的反键表面吸附态，这导致速率确定步骤的自由能降低，最终增强了RuO ₂的固有活性。

更新日期：2019-12-30

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