Metal–organic frameworks (MOFs) are regarded as advanced materials for oxygen evolution reactions (OER) because of their large specific surface area, adjustable pore size and abundant intrinsic molecular/atomic metal active sites. However, their essential features, such as the organic-ligand-shielded metal centres and low conductivity, make their electrocatalytic potential far from being exploited. These undesired issues can be avoided by designing and constructing MOF nanoarrays (MOF NAs) on self-supporting and conductive substrates such as the carbon cloth. Transforming appropriate solid material nanoarrays into MOF NAs provides a possibility to unlock the bottleneck. Herein, we have successfully developed a general approach for the morphological and electronic modulation of Co/Ni-MOF-74 NAs with wall-like Co/Ni(OH)₂ NAs as the self-sacrificing template. The wall- or spindle-like morphology of MOF-74 NAs was modulated by changing the dosage of ligand. As a result, Co/Ni-MOF-74 NAs displayed superior activity and stability to those of Co/Ni-MOF-74 prepared without the template. The Co_0.5Ni_0.5-MOF-74 NAs delivered a low overpotential of 244 mV at a current density of 10 mA cm⁻² due to the high proportion of active high-valence Co(III) and Ni(III). The proposed strategy can be extended to obtain brick-like Ni-BDC NAs and needle-like Ni BTC MOF NAs on carbon cloth.

中文翻译：

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由合理的自牺牲模板构建的碳布上可调谐金属-有机骨架纳米阵列，用于高效和稳健的析氧反应

金属有机骨架（MOFs）由于其比表面积大、孔径可调和丰富的内在分子/原子金属活性位点，被认为是用于析氧反应（OER）的先进材料。然而，它们的基本特征，如有机配体屏蔽的金属中心和低电导率，使其电催化潜力远未得到开发。通过在碳布等自支撑和导电基底上设计和构建 MOF 纳米阵列 (MOF NA)，可以避免这些不希望出现的问题。将合适的固体材料纳米阵列转化为 MOF NA 提供了解决瓶颈的可能性。在此，我们成功地开发了一种通用方法，用于具有壁状 Co/Ni(OH) ₂的 Co/Ni-MOF-74 NAs 的形态和电子调制NAs 作为自我牺牲的模板。MOF-74 NAs 的壁状或纺锤状形态通过改变配体的剂量来调节。结果，Co/Ni-MOF-74 NAs 表现出优于没有模板制备的 Co/Ni-MOF-74 的活性和稳定性。由于高比例的活性高价 Co( III ) 和 Ni( III ) ，Co _0.5 Ni _0.5 -MOF-74 NA 在 10 mA cm ^-2的电流密度下提供了 244 mV 的低过电位。所提出的策略可以扩展到在碳布上获得砖状 Ni-BDC NA 和针状 Ni BTC MOF NA。