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Highly Stable Vertically Oriented 2H-NbS2 Nanosheets on Carbon Nanotube Films toward Superior Electrocatalytic Activity
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2023-11-12 , DOI: 10.1002/aenm.202302510 You Peng 1 , Lijie Zhu 2 , Chenyu Li 3 , Jingyi Hu 1 , Yue Lu 3 , Jiatian Fu 2 , Fangfang Cui 2 , Xiangzhuo Wang 2 , Anyuan Cao 2 , Qingqing Ji 3 , Yahuan Huan 2 , Yanfeng Zhang 1
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2023-11-12 , DOI: 10.1002/aenm.202302510 You Peng 1 , Lijie Zhu 2 , Chenyu Li 3 , Jingyi Hu 1 , Yue Lu 3 , Jiatian Fu 2 , Fangfang Cui 2 , Xiangzhuo Wang 2 , Anyuan Cao 2 , Qingqing Ji 3 , Yahuan Huan 2 , Yanfeng Zhang 1
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2D metallic transition-metal dichalcogenides (MTMDCs) have attracted widespread research interest in the exploration of fundamental physical issues and energy-related fields. Although relatively high catalytic activity has been predicted theoretically in the new type MTMDCs-based electrocatalysts, their hydrogen evolution reaction (HER) performance is severely hampered by the insufficient catalytic stability due to structural degradation during long-time use and limited active sites in planar electrode structures. Herein, the scalable synthesis of vertically-oriented 2H-NbS2 nanosheets is reported on low-cost carbon nanotube (CNT) film substrates by a facile chemical vapor deposition route. The 3D vertically-oriented 2H-NbS2 nanosheets present abundant edge active sites and strong interface coupling with CNT thus possessing exceptional mechanical stability. These features impart the 3D nanosheets catalysts with remarkably low overpotentials of ≈55 mV at 10 mA cm−2 and ultra-high exchange current density of ≈1445 µA cm−2, and negligible performance degradation after 200 h operation at the large current density, which are superior to those of other TMDCs-based catalysts. This work hereby provides novel perspectives for the batch synthesis and application of 3D MTMDCs-based electrocatalysts with greatly improved electrocatalytic performance and stability that are needed for practical applications.
中文翻译：
碳纳米管薄膜上高度稳定的垂直取向 2H-NbS2 纳米片具有优异的电催化活性
二维金属过渡金属二硫属化物（MTMDC）在探索基本物理问题和能源相关领域引起了广泛的研究兴趣。尽管理论上预测新型 MTMDCs 电催化剂具有相对较高的催化活性，但由于长期使用过程中的结构退化和平面电极有限的活性位点导致催化稳定性不足，严重阻碍了其析氢反应（HER）性能结构。在此，报道了通过简便的化学气相沉积途径在低成本碳纳米管（CNT）薄膜基底上大规模合成垂直取向的2H-NbS 2纳米片。3D垂直取向的2H-NbS 2纳米片具有丰富的边缘活性位点和与CNT的强界面耦合，从而具有优异的机械稳定性。这些特性赋予3D纳米片催化剂在10 mA cm -2下具有约55 mV的极低过电势和约1445 µA cm -2的超高交换电流密度，并且在大电流密度下运行200小时后性能下降可以忽略不计。优于其他基于 TMDC 的催化剂。这项工作为基于 3D MTMDCs 的电催化剂的批量合成和应用提供了新的视角，大大提高了实际应用所需的电催化性能和稳定性。
更新日期：2023-11-12
中文翻译：
碳纳米管薄膜上高度稳定的垂直取向 2H-NbS2 纳米片具有优异的电催化活性
二维金属过渡金属二硫属化物（MTMDC）在探索基本物理问题和能源相关领域引起了广泛的研究兴趣。尽管理论上预测新型 MTMDCs 电催化剂具有相对较高的催化活性，但由于长期使用过程中的结构退化和平面电极有限的活性位点导致催化稳定性不足，严重阻碍了其析氢反应（HER）性能结构。在此，报道了通过简便的化学气相沉积途径在低成本碳纳米管（CNT）薄膜基底上大规模合成垂直取向的2H-NbS 2纳米片。3D垂直取向的2H-NbS 2纳米片具有丰富的边缘活性位点和与CNT的强界面耦合，从而具有优异的机械稳定性。这些特性赋予3D纳米片催化剂在10 mA cm -2下具有约55 mV的极低过电势和约1445 µA cm -2的超高交换电流密度，并且在大电流密度下运行200小时后性能下降可以忽略不计。优于其他基于 TMDC 的催化剂。这项工作为基于 3D MTMDCs 的电催化剂的批量合成和应用提供了新的视角，大大提高了实际应用所需的电催化性能和稳定性。
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