Development of cost-effective, active and durable electrocatalysts for overall water splitting is still a huge challenge. Herein, we have constructed one-dimensional (1D) cobalt sulfide and vanadium sulfide heterojunction nanowires arranged on carbon cloth (Co₉S₈-V₃S₄/CC) as bifunctional electrocatalysts for the efficient overall water splitting. The 1D wire-structured Co₉S₈-V₃S₄ heterojunctions possess large surface area, plentiful active sites and rapid transport of electrons/reactants and the release of gas. Importantly, the electron transfer from Co₉S₈ to V₃S₄ occurs at the interface due to the strong electronic coupling effect in Co₉S₈-V₃S₄ heterojunction, in which the electron-attracting V₃S₄ (V²⁺) optimizes the adsorption of H^* active species for hydrogen evolution reaction (HER), while the electron-losing Co₉S₈ (Co³⁺) responds to the enhancement of oxygen evolution reaction (OER) activity. Co₉S₈-V₃S₄/CC exhibits low overpotentials of 85 and 232 mV at 10 mA cm⁻² and small Tafel slopes of 51 and 59 mV dec⁻¹ for HER and OER, respectively. Especially, the electrolyzer with Co₉S₈ V₃S₄/CC as both the anode and cathode requires low onset voltage of 1.35 V and cell voltage of 1.53 V at 10 mA cm⁻² and exhibits high Faradaic efficiencies and robust stability. It can be driven by a solar cell (1.53 V) for continuous production of hydrogen and oxygen. This study highlights the design of 1D sulfide heterojunction in pursuit of highly efficient electrocatalysts for overall water splitting.

开发用于整体水分解的经济有效的，耐用的电催化剂仍然是巨大的挑战。在这里，我们已经构造了布置在碳布上的一维（1D）硫化钴和硫化钒异质结纳米线（Co ₉ S ₈ -V ₃ S ₄ / CC）作为双功能电催化剂，以实现有效的总水分解。一维线状Co ₉ S ₈ -V ₃ S ₄异质结具有较大的表面积，丰富的活性位点以及电子/反应物的快速传输和释放气体。重要的是，电子从Co ₉ S ₈转移到V ₃小号₄在界面处由于钴的强电子耦合效应发生₉小号₈ -V ₃小号₄的异质结，其中，所述吸电子基V ₃ š ₄（V ²⁺）优化H的吸附^*为氢的活性种析出反应（HER），而失去电子的Co ₉ S ₈（Co ³⁺）对氧析出反应（OER）活性的增强作出响应。Co ₉ S ₈ -V ₃ S ₄ / CC在10 mA cm ^-2时显示85和232 mV的低过电势HER和OER的Tafel小斜率分别为51和59 mV dec ^-1。特别地，以Co ₉ S ₈ V ₃ S ₄ / CC为阳极和阴极的电解器在10 mA cm ^-2时需要1.35 V的低启动电压和1.53 V的电池电压，并具有高法拉第效率和鲁棒的稳定性。它可以由太阳能电池（1.53 V）驱动，以连续产生氢和氧。这项研究着重于一维硫化物异质结的设计，以追求用于整体水分解的高效电催化剂。