A self-reactivated PdCu catalyst for aldehyde electro-oxidation with anodic hydrogen production

Ming Yang, Yimin Jiang, Chung-Li Dong, Leitao Xu, Yutong Huang, Shifan Leng, Yandong Wu, Yongxiang Luo, Wei Chen, Ta Thi Thuy Nga, Shuangyin Wang and Yuqin Zou ()
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Ming Yang: Hunan University
Yimin Jiang: Hunan University
Chung-Li Dong: Tamkang University
Leitao Xu: Hunan University
Yutong Huang: Hunan University
Shifan Leng: Hunan University
Yandong Wu: Hunan University
Yongxiang Luo: Hunan University
Wei Chen: Hunan University
Ta Thi Thuy Nga: Tamkang University
Shuangyin Wang: Hunan University
Yuqin Zou: Hunan University

Nature Communications, 2024, vol. 15, issue 1, 1-11

Abstract: Abstract The low-potential aldehyde oxidation reaction can occur at low potential (~0 VRHE) and release H2 at the anode, enabling hydrogen production with less than one-tenth of the energy consumption required for water splitting. Nevertheless, the activity and stability of Cu catalysts remain inadequate due to the oxidative deactivation of Cu-based materials. Herein, we elucidate the deactivation and reactivation cycle of Cu electrocatalyst and develop a self-reactivating PdCu catalyst that exhibits significantly enhanced stability. Initially, in-situ Raman spectroscopy confirm the cycle involved in electrochemical oxidation and non-electrochemical reduction. Subsequently, in-situ Raman spectroscopy and X-ray absorption fine structure reveal that the Pd component accelerates the rate of the non-electrochemical reduction, thereby enhancing the stability of the Cu-based electrocatalyst. Finally, a bipolar hydrogen production device is assembled utilizing the PdCu electrocatalyst, which can deliver a current of 400 mA cm−2 at 0.42 V and operate continuously for 120 h. This work offers guidance to enhance the stability of the Cu-based electrocatalyst in a bipolar hydrogen production system.

Date: 2024
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DOI: 10.1038/s41467-024-54286-y

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