Boosting eco-friendly hydrogen generation by urea-assisted water electrolysis using spinel M2GeO4 (M = Fe, Co) as an active electrocatalyst,Environmental Science: Nano

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Boosting eco-friendly hydrogen generation by urea-assisted water electrolysis using spinel M2GeO4 (M = Fe, Co) as an active electrocatalyst
Environmental Science: Nano ( IF 5.8 ) Pub Date : 2021-09-13 , DOI: 10.1039/d1en00529d
Hyeonuk Choi _{1,

2,

3} , Subramani Surendran _{1,

2,

3} , Dohun Kim _{1,

2,

3} , Yoongu Lim _{1,

2,

3,

4} , Jaehyoung Lim _{1,

2,

3} , Jihyun Park _{1,

2,

3} , Jung Kyu Kim ₅ , Mi-Kyung Han _{1,

2,

3} , Uk Sim _{1,

2,

3,

4}

Affiliation

To enhance the efficiency of hydrogen production, bimetallic oxides with spinel structures, M₂GeO₄ (M = Fe, Co), were synthesized via a facile one-pot hydrothermal method and were used as electrocatalysts for urea-assisted water electrolysis. In alkaline electrolyte with urea, Fe₂GeO₄, which was used as the anode in the electrolysis cell, exhibited a lower potential (1.53 V (vs. RHE)) and a smaller Tafel slope (76 mV dec⁻¹) Co₂GeO₄ (1.65 V (vs. RHE), 79 mV dec⁻¹), indicating that Fe₂GeO₄ reduced the overall input potential to produce H₂. The superior performance of Fe₂GeO₄ in the urea-added water electrolysis was attributed to the higher oxidation state of its metal cations, larger electrochemical active surface area, and lower charge transfer resistance than those of Co₂GeO₄. Hence, Fe₂GeO₄ showed 5.49 times higher H₂ peak intensity than Co₂GeO₄, indicating higher efficiency of H₂ production.

中文翻译：

使用尖晶石 M2GeO4 (M = Fe, Co) 作为活性电催化剂通过尿素辅助水电解促进环保制氢

为了提高制氢效率，通过简便的一锅水热法合成了具有尖晶石结构的双金属氧化物 M ₂ GeO ₄ (M = Fe, Co)，并将其用作尿素辅助水电解的电催化剂。在含尿素的碱性电解液中，用作电解槽阳极的Fe ₂ GeO ₄表现出较低的电位（1.53 V（相对于RHE））和较小的 Tafel 斜率（76 mV dec ^-1）Co ₂ GeO ₄ (1.65 V ( vs. RHE), 79 mV dec ^-1 )，表明 Fe ₂ GeO ₄降低了产生 H ₂的总投入潜力。Fe ₂ GeO ₄在尿素加水电解中的优越性能归因于其金属阳离子的更高氧化态、更大的电化学活性表面积和比Co ₂ GeO ₄更低的电荷转移电阻。因此，Fe ₂ GeO ₄显示出比Co ₂ GeO ₄高5.49 倍的H ₂峰强度，表明H ₂生产效率更高。

更新日期：2021-10-06

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