Electrodeposition of Ni-Co-S Electrocatalyst Using 2,5-dimercapto-1,3,4-thiadiazole as S Precursor for Hydrogen Evolution Reaction at Neutral pH

IF 2.7 4区化学 Q3 CHEMISTRY, PHYSICAL

Electrocatalysis Pub Date : 2023-07-18 DOI:10.1007/s12678-023-00837-8

Yeosol Yoon, Sehyun Yoo, Taeho Lim

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Abstract

Among various chalcogenide materials, transition metal sulfides are known to be effective catalysts for the electrochemical hydrogen evolution reaction (HER). In particular, Ni-Co-S is a promising material for the next generation of non-precious metal HER catalysts due to its excellent HER activity in neutral pH solutions. Ni-Co-S is also advantageous in large-scale applications, as it enables relatively simple catalytic synthesis through electrodeposition. In this study, we employed a new S precursor, 2,5-dimercapto-1,3,4-thiadiazole (DMTD), for the electrodeposition of Ni-Co-S, instead of the conventional S precursor, thiourea (TU). Ni-Co-S synthesized with DMTD (Ni-Co-S_DMTD) showed enhanced HER activity at neutral pH compared to that synthesized with TU (Ni-Co-S_TU). It has been found that this improvement in activity is due to the large surface area and high S content of Ni-Co-S_DMTD. The S content and HER activity of Ni-Co-S_DMTD depend on the concentration of DMTD. At the optimal DMTD concentration (12 mM), Ni-Co-S_DMTD exhibited an overpotential of 303 mV at a current density of 10 mA cm^− 2 and a Tafel slope of 99 mV dec^− 1 in a phosphate buffer solution (pH 7.4).

Graphical Abstract

Abstract Image

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以2,5-二巯基-1,3,4-噻二唑为S前驱体的Ni-Co-S电催化剂在中性pH下电沉积的析氢反应

在各种硫系材料中，过渡金属硫化物是电化学析氢反应(HER)的有效催化剂。特别是，Ni-Co-S在中性pH溶液中具有优异的HER活性，是下一代非贵金属HER催化剂的理想材料。Ni-Co-S在大规模应用中也具有优势，因为它可以通过电沉积实现相对简单的催化合成。在这项研究中，我们采用了一种新的S前驱体，2,5-二巯基-1,3,4-噻二唑(DMTD)来电沉积Ni-Co-S，取代了传统的S前驱体硫脲(TU)。与TU (Ni-Co-STU)合成的Ni-Co-S相比，DMTD合成的Ni-Co-S在中性pH下的HER活性增强。研究发现，这种活性的提高是由于Ni-Co-SDMTD的大表面积和高S含量。Ni-Co-SDMTD的S含量和HER活性与DMTD的浓度有关。在最佳DMTD浓度(12 mM)下，Ni-Co-SDMTD在10 mA cm−2电流密度下的过电位为303 mV，在pH 7.4的磷酸盐缓冲溶液中，Tafel斜率为99 mV dec−1。图形抽象

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来源期刊

Electrocatalysis CHEMISTRY, PHYSICAL-ELECTROCHEMISTRY

CiteScore

4.80

自引率

6.50%

发文量

审稿时长

>12 weeks

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