金属有机框架 (MOF) 衍生的板状 CoS1.097 纳米粒子用于改进析氢反应,Dalton Transactions

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金属有机框架 (MOF) 衍生的板状 CoS1.097 纳米粒子用于改进析氢反应
Dalton Transactions ( IF 3.5 ) Pub Date : 2022-06-13 , DOI: 10.1039/d2dt01630c
Nachiketa Sahu _{1,

2} , Jiban K Das _{1,

2} , J N Behera _{1,

2}

Affiliation

金属-有机框架 (MOF) 衍生的过渡金属硫化物被视为可靠、具有成本效益和可替代的析氢反应 (HER) 高效电催化剂。它们已被用于替代铂（及其合金），用于生产氢气等可再生能源载体。通过不同的合成路线开发非贵重过渡金属硫化物以获得具有增强 HER 活性的独特形态纳米结构的进展具有挑战性。我们介绍了一种过渡金属硫化物，硫化钴 (CoS _1.097 )，它是通过简单的一步溶剂热硫化衍生自钴 MOF [Co-BPY-DDE] 的。通过在溶剂热法中改变硫化温度（从 140 °C 到 180 °C），获得了三种硫化钴产品：CoS_{分别为1.097} -140、CoS_1.097 -160 和 CoS_1.097 -180。温度变化在优化电催化剂的 HER 活性方面起着至关重要的作用。此外，值得注意的板状硫化钴纳米粒子 (CoS_1.097 -160) 需要 163 mV 的过电位才能提供 10 mA cm^{-2的电流密度和 53 mV dec}^-1的低塔菲尔斜率，从而在反应过程中表现出更快的反应动力学。分子氢的演化。此外，电催化剂的 25 小时长期稳定性反映了其在酸性介质中的实际适用性。COS_1.097-160具有均匀的板状形态和较大的电化学活性表面积，有助于通过水电解提高电化学性能。

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Metal–organic framework (MOF)-derived plate-shaped CoS1.097 nanoparticles for an improved hydrogen evolution reaction

Metal–organic framework (MOF)-derived transition metal sulfides are viewed as reliable, cost-effective, and alternative hydrogen evolution reaction (HER)-efficient electrocatalysts. They have been used to replace platinum (and their alloys) for production of renewable energy carriers such as hydrogen. Progress towards development of non-precious transition-metal sulfides through different synthetic routes to obtain unique morphological nanostructures with enhanced HER activity is challenging. We introduced a transition-metal sulfide, cobalt sulfide (CoS_1.097), derived from a cobalt MOF [Co-BPY-DDE] by following facile, one-step solvothermal sulfurization. By varying the sulfurization temperature (from 140 °C to 180 °C) during the solvothermal method, three cobalt-sulfide products were obtained: CoS_1.097-140, CoS_1.097-160, and CoS_1.097-180, respectively. Temperature variation had a vital role in optimizing the HER activity of the electrocatalyst. Besides, notable plate-shaped cobalt sulfide nanoparticles (CoS_1.097-160) required overpotential of 163 mV to deliver a current density of 10 mA cm⁻² with a low Tafel slope of 53 mV dec⁻¹, thereby demonstrating faster reaction kinetics during the evolution of molecular hydrogen. Furthermore, 25 h of long-term stability of the electrocatalyst reflected its practical applicability in acidic media. CoS_1.097-160 had uniform plate-shaped morphology and large electrochemical active surface area, which contributed to enhanced electrochemical performance through water electrolysis.

更新日期：2022-06-13

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