过电位
催化作用
X射线光电子能谱
法拉第效率
无机化学
产量(工程)
氮气
选择性
材料科学
过渡金属
化学
氨
电化学
化学工程
物理化学
电极
有机化学
工程类
冶金
作者
Yuyao Sun,Yi Han,Xinyi Zhang,Wenwen Cai,Yanyun Zhang,Yan Zhang,Zhenjiang Li,Bin Li,Jianping Lai,Lei Wang
标识
DOI:10.1016/j.apcatb.2022.121933
摘要
Titanium dioxide (TiO2) is widely used as a representative transition metal oxides (TMOs) catalyst for electrocatalytic nitrogen reduction reaction (NRR). However, the low stability, low selectivity, low ammonia (NH3) yield and high overpotential of TiO2 towards NRR strongly restricted its application in NRR. Here, we firstly add H to the lattice to synthesize a black TiO2−x with oxygen vacancies (OVs) (B-TiO1.8) for electrocatalytic NRR. After we optimized the amount of H and OVs, the NH3 yield and stability can achieve 31.6 μg h−1 mgcat−1 and 100 h at − 0.1 V (vs. RHE), respectively, the faradaic efficiency (FE) can achieve 47.7% at 0 V (vs. RHE). In situ FTIR / ESR / XPS / TPD illustrate that OVs can promote the adsorption and activation of nitrogen (N2), and lattice H can increase the number of OVs and stabilize them, suppress the hydrogen evolution reaction (HER) and promote the hydrogenation of N2.
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