Ru-doped, oxygen-vacancy-containing CeO2 nanorods toward N2 electroreduction,Journal of Materials Chemistry A

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Ru-doped, oxygen-vacancy-containing CeO2 nanorods toward N2 electroreduction
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2020/03/18 , DOI: 10.1039/d0ta02211j
Yu Ding _{1,

2,

3,

4,

5} , Linsong Huang _{1,

2,

3,

4,

5} , Junbo Zhang _{1,

2,

3,

4,

5} , Anxiang Guan _{1,

2,

3,

4,

5} , Qihao Wang _{1,

2,

3,

4,

5} , Linping Qian _{1,

2,

3,

4,

5} , Lijuan Zhang _{1,

2,

3,

4,

5} , Gengfeng Zheng _{1,

2,

3,

4,

5}

Affiliation

Electrochemical N₂ reduction (N₂RR) in aqueous solutions under ambient conditions is extremely challenging; thus, a rational design of electrocatalytic centers is required to effectively adsorb and activate N₂. Herein, we report Ru cluster-doped, oxygen vacancy-rich CeO₂ (Ru/CeO₂-V_O) nanorods as an efficient N₂ reduction electrocatalyst. The high-density oxygen vacancies inside CeO₂ are beneficial for the adsorption of N₂, and the unsaturated, low-valence Ru nanoclusters provide active sites for N₂ activation and subsequent electron transfer for N₂ reduction. The Ru/CeO₂-V_O catalyst exhibits a high ammonia production rate of 9.87 × 10⁻⁸ mmol s⁻¹ cm⁻² and a partial current density of 32 μA cm⁻² at −0.25 V versus reversible hydrogen electrode in 0.05 M H₂SO₄ solution, corresponding to a faradaic efficiency of 11.7%. Our work suggests that the synergistic effects between Ru nanoclusters and oxygen vacancies in CeO₂ for efficient N₂ fixation.

中文翻译：

掺钌，含氧空位的CeO2纳米棒对N2电还原的影响

在环境条件下水溶液中的电化学N ₂还原（N ₂ RR）极具挑战性。因此，需要合理设计电催化中心以有效地吸附和活化N ₂。在本文中，我们报道孺簇掺杂的，富氧空位的CeO ₂（RU /的CeO ₂ -V _ö）纳米棒作为一种高效ñ ₂还原电催化剂。CeO ₂内的高密度氧空位有利于N ₂的吸附，不饱和的低价Ru纳米簇为N ₂活化和随后的N ₂电子转移提供了活性位点减少。与0.05 MH中的可逆氢电极相比，Ru / CeO ₂ -V _O催化剂在-0.25 V时表现出9.87×10 ^-8 mmol s ^-1 cm ^-2的高氨生成率和32μAcm ^-2的分流密度₂ SO ₄溶液，对应的法拉第效率为11.7％。我们的工作表明，Ru纳米团簇与CeO _2中的氧空位之间的协同效应可有效固定N ₂。

更新日期：2020-04-15

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