One-pot Hydrothermal Synthesis of Bifunctional Co/Mo-rGO efficient Electrocatalyst for HER/OER in Water Splitting

IF 2.3 4区化学 Q3 CHEMISTRY, PHYSICAL

Catalysis Letters Pub Date : 2024-06-21 DOI:10.1007/s10562-024-04723-w

Lishuang Zhao, Siyan Liu, Liguo Wei, Huiyi He, Bo Jiang, Zhaoshun Zhan, Jing Wang, Xuewei Li, Wentao Gou

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Abstract

Fabrication of highly efficient and earth-abundant bifunctional electrocatalyst to accelerate the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) are critical for overall water splitting. In this work, bimetallic Co/Mo oxides modified reduced graphene oxide (rGO) was synthesized using a simple one-pot hydrothermal method, which significantly improved the electrocatalytic activity in both HER and OER. Under the optimal conditions, the double layer capacitance of rGO modified by Co/Mo bimetal is 78.08 mF cm⁻². The overpotential required for HER to reach -10 mA cm⁻² current density is 488 mV, the dynamic Tafel slope is 126 mV dec⁻¹. The overpotential required for OER to reach 10 mA cm⁻² current density is 420 mV, the slope of kinetic Tafel is 169 mV dec⁻¹. This work provides a new prospect for the rational design and fabrication of efficient HER/OER bifunctional electrocatalysts in electrochemical energy device application.

Graphical Abstract

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一锅水热法合成双功能 Co/Mo-rGO 高效电催化剂，用于水分离中的 HER/OER

制备高效且富含土的双功能电催化剂以加速氢进化反应（HER）和氧进化反应（OER）对整个水分离过程至关重要。本研究采用简单的一锅水热法合成了双金属 Co/Mo 氧化物修饰的还原氧化石墨烯（rGO），显著提高了 HER 和 OER 的电催化活性。在最佳条件下，经 Co/Mo 双金属修饰的 rGO 的双层电容为 78.08 mF cm-2。HER 达到 -10 mA cm-2 电流密度所需的过电位为 488 mV，动态塔菲尔斜率为 126 mV dec-1。OER 达到 10 mA cm-2 电流密度所需的过电位为 420 mV，动力学塔菲尔斜率为 169 mV dec-1。这项工作为合理设计和制备高效的 HER/OER 双功能电催化剂在电化学能源装置中的应用提供了新的前景。

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来源期刊

Catalysis Letters 化学-物理化学

CiteScore

5.70

自引率

3.60%

发文量

327

审稿时长

1 months

期刊介绍： Catalysis Letters aim is the rapid publication of outstanding and high-impact original research articles in catalysis. The scope of the journal covers a broad range of topics in all fields of both applied and theoretical catalysis, including heterogeneous, homogeneous and biocatalysis. The high-quality original research articles published in Catalysis Letters are subject to rigorous peer review. Accepted papers are published online first and subsequently in print issues. All contributions must include a graphical abstract. Manuscripts should be written in English and the responsibility lies with the authors to ensure that they are grammatically and linguistically correct. Authors for whom English is not the working language are encouraged to consider using a professional language-editing service before submitting their manuscripts.

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