In situ electrochemical reduction-assisted exfoliation: conversion of BiOCl nanoplates into Bi nanosheets enables efficient electrocatalytic nitrogen fixation,Sustainable Energy & Fuels

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In situ electrochemical reduction-assisted exfoliation: conversion of BiOCl nanoplates into Bi nanosheets enables efficient electrocatalytic nitrogen fixation
Sustainable Energy & Fuels ( IF 5.0 ) Pub Date : 2020-04-28 , DOI: 10.1039/d0se00445f
You Xu _{1,

2,

3,

4,

5} , Tianlun Ren _{1,

2,

3,

4,

5} , Shanshan Yu _{1,

2,

3,

4,

5} , Hongjie Yu _{1,

2,

3,

4,

5} , Shuli Yin _{1,

2,

3,

4,

5} , Ziqiang Wang _{1,

2,

3,

4,

5} , Xiaonian Li _{1,

2,

3,

4,

5} , Liang Wang _{1,

2,

3,

4,

5} , Hongjing Wang _{1,

2,

3,

4,

5}

Affiliation

The electrocatalytic nitrogen reduction reaction (NRR) for ammonia (NH₃) synthesis is highly desirable yet still challenging. Catalysts, as the core component of electrocatalytic NRR systems, are a specific focus of research. In this work, we demonstrate that NRR active semimetal bismuth (Bi) ultrathin nanosheets (Bi NSs) could be prepared by means of the in situ electrochemical reduction-assisted exfoliation of BiOCl nanoplates (BiOCl NPs). Such a conversion, from semiconductive BiOCl NPs to semimetal Bi NSs, could create enlarged surface areas and bring about abundant under-coordinated Bi sites and accelerated electron transport capability. With these advantageous properties, the as-converted Bi NSs exhibit efficient NRR electrocatalytic activity in 0.1 M Na₂SO₄, achieving a high faradaic efficiency (14.14%) and NH₃ yield (11.11 μg h⁻¹ mg_cat.⁻¹) at −0.5 V (vs. reversible hydrogen electrode), as well as high NH₃ selectivity.

中文翻译：

原位电化学还原辅助剥离：将BiOCl纳米板转化为Bi纳米板可实现高效的电催化固氮

氨（NH ₃）合成的电催化氮还原反应（NRR）是非常需要的，但仍具有挑战性。催化剂作为电催化NRR系统的核心组成部分，是研究的重点。在这项工作中，我们证明了可以通过BiOCl纳米板（BiOCl NPs）的原位电化学还原辅助剥离法制备NRR活性半金属铋（Bi）超薄纳米片（Bi NSs ）。从半导体BiOCl NPs到半金属Bi NSs的这种转化会产生更大的表面积，并导致大量的配位不足的Bi位置和加速的电子传输能力。具有这些有利的性能，转化后的Bi NS在0.1 M Na _2中表现出有效的NRR电催化活性SO ₄，实现高的法拉第效率（14.14％）和NH ₃的产率（11.11微克ħ ^-1毫克_猫。^-1 -0.5 V）（对可逆氢电极），以及高的NH ₃选择性。

更新日期：2020-06-30

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