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Enhanced electrocatalytic nitrate-to-ammonia performance from Mott–Schottky design to induce electron redistribution
Chemical Science ( IF 7.6 ) Pub Date : 2024-11-18 , DOI: 10.1039/d4sc06818a
Ruikai Qi 1 , Qiuling Jiang 2, 3 , Li Deng 1 , Xianqiang Yu 1 , Bingyan Shi 1 , Mengxiao Zhong 4 , Ying Wang 2 , Xiaofeng Lu 1
Affiliation  

Constructing highly efficient electrocatalysts via interface manipulation and structural design to facilitate rapid electron transfer in electrocatalytic nitrate-to-ammonia conversion is crucial to attaining superior NH3 yield rates. Here, a Mott–Schottky type electrocatalyst of Co/In2O3 with a continuous fiber structure has been designed to boost the electrocatalytic nitrate-to-ammonia performance. The optimized Co/In2O3-1 catalyst exhibits an impressive NH3 yield rate of 70.1 mg cm−2 h−1 at −0.8 V vs. the reversible hydrogen electrode (RHE), along with an NH3 faradaic efficiency (FE) of 93.34% at 0 V vs. RHE, greatly outperforming the single-component Co and In2O3 samples. The yield rate of Co/In2O3-1 is also superior to that of most currently reported Co-based catalysts and heterostructured ones. Evidence from experiments and theoretical results confirms the formation of a Mott–Schottky heterojunction, which achieves a Co site enriched with electrons, coupled with an In2O3 facet enriched with holes, inducing an electron redistribution to promote the utilization of electroactive sites. Consequently, the reaction energy barrier for nitrate-to-ammonia conversion is significantly reduced, further enhancing its yield efficiency.

中文翻译:


通过 Mott-Schottky 设计增强电催化硝酸盐制氨性能,以诱导电子重新分布



通过界面操作和结构设计构建高效的电催化剂,以促进电催化硝酸盐到氨转化中的快速电子转移,对于获得卓越的 NH3 产率至关重要。在这里,设计了一种具有连续纤维结构的 Co/In2O3 莫特-肖特基型电催化剂,以提高电催化硝酸盐制氨的性能。与可逆氢电极 (RHE) 相比,优化后的 Co/In2O3-1 催化剂在 -0.8 V 下的 NH3 产率高达 70.1 mg cm-2 h-1,在 0 V 与 RHE 相比,NH3 法拉第效率 (FE) 为 93.34%,大大优于单组分 Co 和 In2O3 样品。Co/In2O3-1 的产率也优于目前报道的大多数 Co 基催化剂和异质结构催化剂。实验和理论结果的证据证实了 Mott-Schottky 异质结的形成,它实现了一个富含电子的 Co 位点,再加上一个富含空穴的 In2O3 面,诱导电子重新分布,促进电活性位点的利用。因此,硝酸盐制氨转化的反应能垒显著降低,进一步提高了其产率效率。
更新日期:2024-11-18
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