The development of highly active, stable and inexpensive electrocatalysts for hydrogen production by defects and morphology engineering remains a great challenge. Herein, S vacancies-rich NiS@CuS nanotube heterojunction arrays were in-situ grown on copper foam (V-NiS@V-CuS NHAs/CF) for efficient electrocatalytic overall water splitting. With the merits of nanotube arrays and efficient electronic modulation drived by the 0D vacancy defect and 2D heterojunction defect, the resultant V-NiS@V-CuS NHAs/CF electrocatalyst exhibits excellent electrocatalytic activity with a low overpotential of 47 mV for the hydrogen evolution reaction (HER) at 10 mA cm current density, and 263 mV for the oxygen evolution reaction (OER) at 50 mA cm current density, as well as a cell voltage of 1.48 V at 10 mA cm. Moreover, the nanotube heterojunction arrays endows V-NiS@V-CuS NHAs/CF with outstanding stability in long-term catalytic processes, as confirmed by the continuous chronopotentiometry tests at current densities of 10 mA cm for 100 h.

中文翻译：

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用于构建 VS-Ni3S2@VS-Cu2S 纳米管异质结阵列的缺陷和形貌工程，以实现用于整体水分解的高效双功能电催化剂


通过缺陷和形貌工程开发高活性、稳定且廉价的用于制氢的电催化剂仍然是一个巨大的挑战。在此，富含S空位的NiS@CuS纳米管异质结阵列在泡沫铜（V-NiS@V-CuS NHAs/CF）上原位生长，以实现高效的电催化整体水分解。凭借纳米管阵列和由 0D 空位缺陷和 2D 异质结缺陷驱动的高效电子调制的优点，所得的 V-NiS@V-CuS NHAs/CF 电催化剂表现出优异的电催化活性，析氢反应过电位低至 47 mV (HER) 在 10 mA cm 电流密度下，析氧反应 (OER) 在 50 mA cm 电流密度下为 263 mV，以及 1.48 V 在 10 mA cm 电流密度下的电池电压。此外，纳米管异质结阵列赋予 V-NiS@V-CuS NHAs/CF 在长期催化过程中具有出色的稳定性，在 10 mA cm 电流密度下持续 100 小时的连续计时电位测试证实了这一点。