Strongly Coupled Heterostructured CoP/MoO2 as an Advanced Electrocatalyst for Urea-Assisted Water Electrolysis,Inorganic Chemistry

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Strongly Coupled Heterostructured CoP/MoO2 as an Advanced Electrocatalyst for Urea-Assisted Water Electrolysis
Inorganic Chemistry ( IF 4.3 ) Pub Date : 2024-01-20 , DOI: 10.1021/acs.inorgchem.3c04342
Zhiwei Liu ₁ , Zhenjiang Lu ₁ , Yali Cao ₁ , Jing Xie ₁ , Jindou Hu ₁ , Aize Hao ₁

Affiliation

Developing low-cost electrocatalysts with excellent activity and durability in urea-assisted water splitting is urgently needed in order to achieve sustainable hydrogen production. Herein, we in situ synthesized a robust coupled heterostructured electrocatalyst (CoP/MoO₂) on a nickel foam (NF) substrate and explored its electrocatalytic performances in the hydrogen evolution reaction (HER), oxygen evolution reaction (OER), and urea oxidation reaction (UOR). The overpotential of CoP/MoO₂/NF is found to be only 11 mV at 10 mA cm^–2 during the HER process, which is significantly lower than that of commercial Pt/C. Meanwhile, the UOR catalytic performance of CoP/MoO₂/NF indicates fast reaction kinetics, along with a considerable low driving potential (1.26 V) compared to that of the OER (1.51 V). In situ and ex situ techniques demonstrate that these excellent electrocatalytic properties are mainly ascribed to the effective synergistic coupled effect and strong electronic interactions between single-component CoP and MoO₂, which can tune electronic states of Co and Mo, expose more active sites, enhance intrinsic catalytic activity, and accelerate charge transfer. Moreover, when used in electrochemical overall water splitting and urea-assisted water electrolysis, CoP/MoO₂/NF can reach a current density of 10 mA cm^–2 at only 1.46 and 1.32 V. This outperforms Pt/C||RuO₂ and numerous nonprecious metal electrocatalysts and maintains a stable long-term electrolytic operation for 84 h. This work provides a promising pathway for the development of efficient catalysts during urea-assisted water electrolysis for hydrogen production.

中文翻译：

强耦合异质结构 CoP/MoO2 作为尿素辅助水电解的先进电催化剂

为了实现可持续的氢气生产，迫切需要开发在尿素辅助水分解中具有优异活性和耐久性的低成本电催化剂。在此，我们在泡沫镍（NF）基底上原位合成了一种鲁棒的耦合异质结构电催化剂（CoP/MoO ₂ ），并探索了其在析氢反应（HER）、析氧反应（OER）和尿素氧化反应中的电催化性能。（UOR）。研究发现，在 HER 过程中，CoP/MoO ₂ /NF 在 10 mA cm ^–2下的过电势仅为 11 mV，明显低于商用 Pt/C。同时，CoP/MoO ₂ /NF的UOR催化性能表现出快速的反应动力学，以及与OER（1.51 V）相比相当低的驱动电势（1.26 V）。原位和异位技术表明，这些优异的电催化性能主要归功于单组分CoP和MoO ₂之间有效的协同耦合效应和强电子相互作用，可以调节Co和Mo的电子态，暴露更多的活性位点，增强催化活性。固有的催化活性，并加速电荷转移。此外，当用于电化学全水分解和尿素辅助水电解时，CoP/MoO ₂ /NF仅需1.46和1.32 V即可达到10 mA cm ^–2的电流密度。这优于Pt/C||RuO ₂和多种非贵金属电催化剂，可保持84小时稳定的长期电解运行。这项工作为尿素辅助水电解制氢过程中高效催化剂的开发提供了一条有前景的途径。

更新日期：2024-01-20

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