Controlled phosphating: a novel strategy toward NiP3@CeO2 interface engineering for efficient oxygen evolution electrocatalysis.,Dalton Transactions

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Controlled phosphating: a novel strategy toward NiP3@CeO2 interface engineering for efficient oxygen evolution electrocatalysis.
Dalton Transactions ( IF 3.5 ) Pub Date : 2020-08-13 , DOI: 10.1039/d0dt02599b
Guangyu Ma ₁ , Xiaoqiang Du ₁ , Xiaoshuang Zhang ₂

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Although Ni phosphides are efficient for hydrogen evolution reactions, they are unfavorable for oxygen evolution reactions, so their application in alkaline water electrolysis is limited. It is a feasible method for creating a novel Ni phosphide/oxide heterogeneous interface to promote the oxygen evolution kinetics of Ni phosphide materials in an alkaline medium, yet it has been an unprecedented challenge for researchers. In this work, NiP₃@CeO₂ hybrid nanoparticles are firstly in situ grown on Ni foam (NiP₃@CeO₂/NF) via a novel controlled phosphating strategy. The NiP₃@CeO₂/NF catalysts display a fairly small overpotential of 200 mV to achieve a current density of 25 mA cm⁻² for the oxygen evolution reaction (OER) under alkaline conditions, 110 mV smaller than that of NiO@CeO₂/NF. It is noteworthy that the improved electrocatalytic performance of NiP₃@CeO₂/NF can be attributed to rapid electron transfer and the synergistic catalytic effect of the hybrid material. Density functional theory results demonstrate that NiP₃ shows a stronger water adsorption energy than CeO₂. The novel strategy of controlled phosphating to construct transition metal phosphide/oxide interfaces provides new ideas and methods for the development of efficient and practical water splitting catalysts.

中文翻译：

受控磷化：NiP3 @ CeO2界面工程的一种新策略，可有效地释放氧气。

磷化镍虽然对氢的析出反应有效，但对氧的析出反应不利，因此在碱性水电解中的应用受到限制。这是一种创建新颖的磷化镍/氧化物异质界面以促进碱性介质中磷化镍材料的氧释放动力学的可行方法，但它一直是研究人员面临的前所未有的挑战。在这项工作中，NiP ₃ @CeO ₂杂化纳米颗粒首先通过一种新型的受控磷化策略在泡沫镍（NiP ₃ @CeO ₂ / NF）上原位生长。NiP ₃ @CeO ₂/ NF催化剂显示出200 mV的相当小的超电势，以在碱性条件下实现氧释放反应（OER）的电流密度为25 mA cm ^-2，比NiO @ CeO ₂ / NF的电流密度小110 mV 。值得注意的是，NiP ₃ @CeO ₂ / NF的改善的电催化性能可以归因于快速的电子转移和杂化材料的协同催化作用。密度泛函理论结果表明，NiP ₃具有比CeO ₂更高的吸水能。控制磷酸盐化以构建过渡金属磷化物/氧化物界面的新颖策略为开发高效实用的水分解催化剂提供了新的思路和方法。

更新日期：2020-09-22

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