A Study on Effect of Electrodeposited CoSe Electrocatalyst Dissolution on Hydrogen Evolution Reaction in Acidic Environments

IF 2.7 4区化学 Q3 CHEMISTRY, PHYSICAL

Electrocatalysis Pub Date : 2024-07-30 DOI:10.1007/s12678-024-00881-y

Soyeon Lim, Taeho Lim

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Abstract

CoSe is one of the chalcogenides attracting much attention due to its excellent hydrogen evolution reaction (HER) activity and low price. However, CoSe prepared by electrodeposition generally shows lower HER activity and stability under acidic conditions than those prepared by other methods. In this study, it was assumed that the cause of the low HER performance of electrodeposited CoSe is mainly due to the dissolution of Co and Se, which do not form a stable alloy, and annealing of electrodeposited CoSe was introduced to demonstrate this. We compared the HER activity and stability of non-annealed and annealed CoSe in 0.5 M H₂SO₄ electrolyte and investigated the dissolution behaviors of the two catalysts during HER. As a result, it was found that Co and Se, which did not form a stoichiometric CoSe₂ alloy, were found to be vulnerable in acidic conditions. The annealing induced additional CoSe₂ formation, improving the HER activity and stability of electrodeposited CoSe. The annealed CoSe exhibited an overpotential of 175 mV at 10 mA cm⁻², 27 mV lower than that of non-annealed one, and was stable for 48 h at 10 mA cm⁻².

Graphical Abstract

Abstract Image

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电沉积 CoSe 电催化剂溶解对酸性环境中氢气进化反应影响的研究

CoSe 是一种千氧化物，因其出色的氢进化反应（HER）活性和低廉的价格而备受关注。然而，与其他方法相比，电沉积法制备的 CoSe 在酸性条件下的氢进化活性和稳定性通常较低。本研究认为，电沉积 CoSe 的 HER 性能较低的主要原因是 Co 和 Se 的溶解，没有形成稳定的合金，并引入电沉积 CoSe 的退火来证明这一点。我们比较了未退火和退火 CoSe 在 0.5 M H2SO4 电解液中的 HER 活性和稳定性，并研究了两种催化剂在 HER 过程中的溶解行为。结果发现，没有形成化学计量 CoSe2 合金的 Co 和 Se 在酸性条件下很脆弱。退火诱导形成额外的 CoSe2，提高了电沉积 CoSe 的 HER 活性和稳定性。退火后的 CoSe 在 10 mA cm-2 条件下的过电位为 175 mV，比未退火的低 27 mV，并且在 10 mA cm-2 条件下可稳定 48 小时。

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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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