Hetero-structure induced high performance catalyst for oxygen evolution reaction (OER) in the water splitting reaction has received increased attention. Herein, we demonstrated a novel catalyst system of NiSe2-CoSe2 consisting of nanorods and nanoparticles for the efficient OER in the alkaline electrolyte. This catalyst system can be easily fabricated via a low-temperature selenization of the solvothermal synthesized NiCo(OH)(x) precursor and the unique morphology of hybrid nanorods and nanoparticles was found by the electron microscopy analysis. The high valence state of the metal species was indicated by X-ray photoelectron spectroscopy study and a strong electronic effect was found in the NiSe2-CoSe2 catalyst system compared to their counterparts. As a result, NiSe2-CoSe2 exhibited high catalytic performance with a low overpotential of 250 mV to reach 10 mA.cm(-2) for OER in the alkaline solution. Furthermore, high catalytic stability and catalytic kinetics were also observed. The superior performance can be attributed to the high valence states of Ni and Co and their strong synergetic coupling effect between the nanorods and nanoparticles, which could accelerate the charge transfer and offer abundant electrocatalytic active sites. The current work offers an efficient hetero-structure catalyst system for OER, and the results are helpful for the catalysis understanding.

中文翻译：

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具有混合纳米棒和纳米颗粒结构的 NiSe2-CoSe2 用于高效的析氧反应

用于水分解反应中的析氧反应（OER）的异质结构诱导高性能催化剂受到越来越多的关注。在此，我们展示了一种由纳米棒和纳米颗粒组成的新型 NiSe2-CoSe2 催化剂体系，用于在碱性电解质中实现高效的 OER。该催化剂体系可以通过溶剂热合成的 NiCo(OH)(x) 前体的低温硒化轻松制造，并且通过电子显微镜分析发现了混合纳米棒和纳米颗粒的独特形态。X 射线光电子能谱研究表明金属物种的高价态，与对应物相比，在 NiSe2-CoSe2 催化剂体系中发现了强烈的电子效应。因此，NiSe2-CoSe2 表现出高催化性能，在碱性溶液中 OER 的过电位低至 250 mV，达到 10 mA.cm(-2)。此外，还观察到高催化稳定性和催化动力学。优异的性能可归因于 Ni 和 Co 的高价态以及它们在纳米棒和纳米粒子之间的强协同耦合效应，这可以加速电荷转移并提供丰富的电催化活性位点。目前的工作为OER提供了一种高效的异质结构催化剂体系，结果有助于催化理解。优异的性能可归因于 Ni 和 Co 的高价态以及它们在纳米棒和纳米粒子之间的强协同耦合效应，这可以加速电荷转移并提供丰富的电催化活性位点。目前的工作为OER提供了一种高效的异质结构催化剂体系，结果有助于催化理解。优异的性能可归因于 Ni 和 Co 的高价态以及它们在纳米棒和纳米粒子之间的强协同耦合效应，这可以加速电荷转移并提供丰富的电催化活性位点。目前的工作为OER提供了一种高效的异质结构催化剂体系，结果有助于催化理解。