Designing noble-metal-free and highly active bifunctional electrocatalysts for overall water splitting is extremely desirable. Herein, we apply a facile method to fabricate cobalt nitride porous nanowires with a length of 7 μm and a diameter of 135 nm on carbon cloth (CC) as a bifunctional electrocatalyst for overall water splitting. The self-supported cobalt nitride porous nanowire arrays exhibit superior catalytic activities with a current density of 10 mA cm^-2 at an overpotential of 97 mV for hydrogen evolution reaction and at an overpotential of 251 mV for oxygen evolution reaction. The alkaline water electrolyzer with the self-supported porous nanowire arrays as cathode and anode requires a cell voltage of 1.587 V to achieve a current density of 10 mA cm⁻² and shows long-term stability at the high current density(∼360 mA cm⁻²) over 37 h, favorably comparable to the integrated performance of commercial Pt and IrO₂.

设计用于整体水分解的无贵金属且高活性的双功能电催化剂是非常需要的。在这里，我们应用一种简便的方法在碳布（CC）上制造长度为7μm，直径为135 nm的氮化钴多孔纳米线，作为用于整体水分解的双功能电催化剂。自支撑的氮化钴多孔纳米线阵列显示出优异的催化活性， 对于氢析出反应，在97 mV的过电势下，对于氧析出反应在251 mV的过电势下，电流密度为10 mA cm ^-2。具有自支撑多孔纳米线阵列作为阴极和阳极的碱性水电解槽需要1.587 V的电池电压才能实现10 mA cm ^-2的电流密度并在37 h的高电流密度（〜360 mA cm ^-2）下显示了长期稳定性，可以与商用Pt和IrO ₂的综合性能相媲美。