Tailored Ce-Doped NiMoO4/MoS2@rGO Nanoarchitectures for Sustainable Electrochemical Water Splitting in Alkaline Medium

ACS Applied Engineering Materials Pub Date : 2024-10-30 DOI:10.1021/acsaenm.4c0053310.1021/acsaenm.4c00533

Mubashir Ali, Malik Wahid* and Kowsar Majid*,

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Abstract

In this study, we report a meticulously engineered electrocatalyst employing a multicomponent system consisting of Ce-doped NiMoO₄ nanorods as the primary component. The Ce-doped NiMoO₄ nanorods were primarily integrated with two-dimensional (2D) MoS₂ nanosheets and further modified with rGO, significantly enhancing the charge transport in the interfacial region of the hybrid nanoarchitecture (Ce-NiMoO₄/MoS₂@rGO). Cerium doping, combined with the multicomponent architecture, targeted toward enhancing the density of active sites and conductivity, which promoted efficient water decomposition. The synergistic effect of doping and heterostructure strategies resulted in efficient hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) performance of the Ce-NiMoO₄/MoS₂@rGO electrocatalyst. This electrocatalyst demonstrated impressive bifunctional activity with a low overpotential of 153 mV for the benchmark current of 10 mA cm^–2 and a Tafel slope of 82 mV dec^–1 for the HER. For the OER, an overpotential of 278 mV was observed for the cathodic current of 20 mA cm^–2 with a Tafel slope of 114 mV dec^–1. Additionally, our electrolyzer, utilizing Ce-NiMoO₄/MoS₂@rGO as electrodes, acquired a total current density of 10 mA cm^–2 at a full-cell voltage of 1.58 V. Moreover, the Ce-NiMoO₄/MoS₂@rGO heterostructure exhibited prolonged durability with minimal deactivation even after continuous operation for 24 h.

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用于碱性介质中可持续电化学水分离的掺铈镍氧化物/MoS2@rGO 定制纳米结构

在本研究中，我们报告了一种精心设计的电催化剂，该催化剂采用了一种多组分体系，由掺杂铈的 NiMoO4 纳米棒作为主要成分。掺铈的 NiMoO4 纳米棒主要与二维 (2D) MoS2 纳米片集成，并进一步用 rGO 修饰，从而显著增强了混合纳米结构（Ce-NiMoO4/MoS2@rGO）界面区的电荷传输。铈掺杂与多组分结构相结合，旨在提高活性位点密度和导电性，从而促进水的高效分解。通过掺杂和异质结构策略的协同作用，Ce-NiMoO4/MoS2@rGO 电催化剂实现了高效的氢进化反应（HER）和氧进化反应（OER）性能。这种电催化剂具有令人印象深刻的双功能活性，在基准电流为 10 mA cm-2 时，过电位低至 153 mV，氢进化反应的塔菲尔斜率为 82 mV dec-1。对于 OER，阴极电流为 20 mA cm-2 时的过电位为 278 mV，Tafel 斜坡为 114 mV dec-1。此外，利用 Ce-NiMoO4/MoS2@rGO 作为电极的电解槽在满电池电压为 1.58 V 时获得了 10 mA cm-2 的总电流密度。

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ACS Applied Engineering Materials 材料科学-

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期刊介绍： ACS Applied Engineering Materials is an international and interdisciplinary forum devoted to original research covering all aspects of engineered materials complementing the ACS Applied Materials portfolio. Papers that describe theory simulation modeling or machine learning assisted design of materials and that provide new insights into engineering applications are welcomed. The journal also considers experimental research that includes novel methods of preparing characterizing and evaluating new materials designed for timely applications. With its focus on innovative applications ACS Applied Engineering Materials also complements and expands the scope of existing ACS publications that focus on materials science discovery including Biomacromolecules Chemistry of Materials Crystal Growth & Design Industrial & Engineering Chemistry Research Inorganic Chemistry Langmuir and Macromolecules.The scope of ACS Applied Engineering Materials includes high quality research of an applied nature that integrates knowledge in materials science engineering physics mechanics and chemistry.