Enhancing the activity of oxygen-evolution and chlorine-evolution electrocatalysts by atomic layer deposition of TiO2†,Energy & Environmental Science

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Enhancing the activity of oxygen-evolution and chlorine-evolution electrocatalysts by atomic layer deposition of TiO2†
Energy & Environmental Science ( IF 32.4 ) Pub Date : 2018-12-14 00:00:00 , DOI: 10.1039/c8ee02351d
Cody E. Finke _{1,

2,

2,

3,

4} , Stefan T. Omelchenko _{2,

3,

5} , Justin T. Jasper _{1,

2,

2,

3,

4} , Michael F. Lichterman _{1,

2,

3} , Carlos G. Read _{2,

2,

3,

4,

6} , Nathan S. Lewis _{2,

3,

6} , Michael R. Hoffmann _{1,

2,

2,

3,

4}

Affiliation

We report that TiO₂ coatings formed via atomic layer deposition (ALD) may tune the activity of IrO₂, RuO₂, and FTO for the oxygen-evolution and chlorine-evolution reactions (OER and CER). Electrocatalysts exposed to ∼3–30 ALD cycles of TiO₂ exhibited overpotentials at 10 mA cm⁻² of geometric current density that were several hundred millivolts lower than uncoated catalysts, with correspondingly higher specific activities. For example, the deposition of TiO₂ onto IrO₂ yielded a 9-fold increase in the OER-specific activity in 1.0 M H₂SO₄ (0.1 to 0.9 mA cm_ECSA⁻² at 350 mV overpotential). The oxidation state of titanium and the potential of zero charge were also a function of the number of ALD cycles, indicating a correlation between oxidation state, potential of zero charge, and activity of the tuned electrocatalysts.

中文翻译：

通过原子层沉积TiO ₂†增强析氧和析氯电催化剂的活性

我们报告说，通过原子层沉积（ALD）形成的TiO ₂涂层可能会调节IrO ₂，RuO ₂和FTO的活性，以进行氧释放和氯释放反应（OER和CER）。暴露于TiO _2的约3–30 ALD循环的电催化剂在10 mA cm ^-2的几何电流密度下表现出的过电势比未涂覆的催化剂低几百毫伏，并且比活性更高。例如，将TiO ₂沉积到IrO _2上，在1.0 MH ₂ SO ₄（0.1至0.9 mA cm _ECSA中）的OER比活度增加了9倍。在350 mV超电势下为^-2）。钛的氧化态和零电荷的电势也是ALD循环次数的函数，表明氧化态，零电荷的电势和调整后的电催化剂的活性之间存在相关性。

更新日期：2018-12-14

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