锚定在 MXene-Ti3C2@NF 上的簇状 VCoCOx 纳米片是用于碱性水分离的优质双功能电催化剂

Wenxin Wang, Yourong Tao, Lulu Xu, Ruilong Ye, Peng Yang, Junjie Zhu, Liping Jiang, Xingcai Wu
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摘要

Ti3C2 是一种典型的 MXene,具有与各种过渡金属耦合的巨大潜力。本文通过在 Ti3C2 改性泡沫镍(VCoCOx-Ti3C2@NF)上协同负载 VCoCOx,开发了一种新型有效的催化剂。利用场发射扫描电子显微镜和高分辨率透射电子显微镜对其形态和结构进行了表征。正如预期的那样,通过响应面方法优化的催化剂在氧进化反应(OER)和氢进化反应(HER)中的过电位分别为 290 和 64 mV,Tafel 斜率分别为 82 和 79 mV dec-1。通过使用双功能 VCoCOx-Ti3C2@NF 催化剂,在 1.0 mol L-1 KOH 电解液中,电池电压为 1.52 V 时,水分离电流密度达到 10 mA cm-2,与贵金属电解器 Pt@C@NF||RuO2@NF (1.57 V) 不相上下。此外,所产生的催化剂在连续催化 120 小时后表现出卓越的循环耐久性,在 OER 和 HER 中分别保持了 103.8% 和 105.4% 的电位(V vs 可逆氢电极)。密度泛函理论计算表明,由于 VCoCOx 与 Ti3C2@NF 的结合,OER 和 HER 中间产物的吉布斯自由能垒有所降低。所制备的 VCoCOx-Ti3C2@NF 催化剂是一种很有前景的清洁能源生产电化学材料。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

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Clustered VCoCOx Nanosheets Anchored on MXene–Ti3C2@NF as a Superior Bifunctional Electrocatalyst for Alkaline Water Splitting
Ti3C2, one typical MXene, has great potential to be coupled with various transition metals. Herein, a novel and effective catalyst is developed by synergistically loading VCoCOx onto Ti3C2-modified nickel foam (VCoCOx–Ti3C2@NF). Field emission scanning electron microscope and high-resolution transmission electron microscopy are employed to characterize the morphology and structure. As expected, the catalyst optimized by response surface methodology attains overpotentials of 290 and 64 mV and Tafel slopes of 82 and 79 mV dec−1 for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER), respectively. By using the bifunctional VCoCOx–Ti3C2@NF catalyst, the water splitting current density achieves 10 mA cm−2 in 1.0 mol L−1 KOH electrolyte at cell voltage of 1.52 V, comparable with the noble metal electrolyzer Pt@C@NF||RuO2@NF (1.57 V). Furthermore, the resulting catalyst exhibits excellent cycling durability after 120 h of continuous catalysis, which retains 103.8% and 105.4% of potential (V vs reversible hydrogen electrode) for OER and HER, respectively. Density functional theory calculation reveals that the Gibbs free energy barriers for the OER and HER intermediates are reduced due to the integration of VCoCOx with Ti3C2@NF. The fabricated VCoCOx–Ti3C2@NF catalyst is a promising electrochemical material for clean energy production.
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