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首页> 外文期刊>ACS Sustainable Chemistry & Engineering >Self-Assembled Ni3S2 Nanosheets with Mesoporous Structure Tightly Held on Ni Foam as a Highly Efficient and Long-Term Electrocatalyst for Water Oxidation
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Self-Assembled Ni3S2 Nanosheets with Mesoporous Structure Tightly Held on Ni Foam as a Highly Efficient and Long-Term Electrocatalyst for Water Oxidation

机译：具有中孔结构的自组装Ni3S2纳米片，其在Ni泡沫上紧密保持，作为水氧化的高效和长期电催化剂

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摘要

Synthesis of highly efficient and stable electrocatalysts for oxygen evolution reaction remains a big challenge. Herein, we rationally designed a novel route, involving hydrothermal electrodeposition of Ni/Zn alloy and in situ electrochemical dealloying followed by sulfuration, to fabricate three-dimensional mesoporous nickel sulfide nanosheets assembled tightly on Ni foam for oxygen evolution reaction. The mesoporous Ni3S2 nanosheets/Ni foam exhibited a highly mesoporous structure with a specific surface area of 60.1 m(2) g(-1) and showed a low overpotential of 223 mV at a current density of 10 mA cm(-2) with a small Tafel slope of 60.5 mV dec(-1); this overpotential is superior to that of IrO2/Ni foam. As-prepared Ni3S2 nanosheets/Ni foam achieved a high turnover frequency value of 0.61 mol O-2 s(-1) at an overpotential of 500 mV. Impressively, the as-obtained catalyst possessed excellent conductivity and outstanding stability for over 240 h. The superior catalytic property could be ascribed to the rational synthetic process, morphology-controlled mesoporous structure, and highly exposed active sites. This paper presents an efficient route to fabricate porous nanosheets as stable and efficient electrocatalyst for water oxidation.
机译：用于氧气进化反应高效稳定的电催化剂的合成仍然是一个很大的挑战。在此，我们理性地设计了一种新的途径，涉及Ni / Zn合金的水热电沉积，并且原位电化学脱押，然后硫化，以制造在Ni泡沫上紧密地组装的三维介孔镍硫化物纳米片，用于氧气进化反应。介孔Ni3S2纳米片/ Ni泡沫表现出高度介孔的结构，具有60.1m（2 )g（-1）的比表面积，并且在电流密度为10 mA cm（-2）的电流密度下显示出低的过电位。小型塔拉斐尔坡度为60.5 mV（-1）;这种过透势优于IRO2 / NI泡沫。制备的Ni3S2纳米片/ Ni泡沫在500mV的过电位下实现了0.61mol O-2 S（-1）的高档频率值。令人印象深刻的是，AS获得的催化剂具有优异的导电性和出色的稳定性超过240小时。优异的催化性能可以归因于合理的合成过程，形态控制的介孔结构和高度暴露的活性位点。本文介绍了制造多孔纳米片的有效途径，作为水氧化的稳定和有效的电催化剂。

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