In this work, a synergistic strategy is proposed to synthesize a high-performance bifunctional electrocatalyst (marked as Co₃Se₄/N-CNTs) for neutral water splitting, in which Co₃Se₄ nanoparticles are wrapped into N-doped multiwall carbon nanotubes assembled hollow dodecahedron framework. The neutral-oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) catalytic performances of Co₃Se₄/N-CNTs are maximally optimized by regulating nanostructure engineering, element doping, and carbon coating. In 1 m phosphate buffer solution (PBS) electrolyte, Co₃Se₄/N-CNTs catalyst exhibits superior stability and catalytic activity for OER and HER, yielding a geometrical catalytic current density of 10 and −10 mA cm⁻² at rather low overpotentials of 385 and 102 mV, respectively, meanwhile operating continuously for 35 h without obvious polarization increase. It is worth mentioning here, when a neutral electrolyzer is assembled, Co₃Se₄/N-CNTs‖ Co₃Se₄/N-CNTs cell contributes a high performance for overall water splitting in 1 m PBS electrolyte, delivering a current density of 10 mA cm⁻² at a low applied external potential of 1.75 V, and displaying satisfying operation stability without evident deactivation after 35 h. The catalytic performances rival those of catalysts operated under moderate conditions. Consequently, all the merits promise that Co₃Se₄/N-CNTs is an attractive bifunctional catalyst for hydrogen fuel production and storage of intermittent renewable energy sources under environmentally friendly conditions.

中文翻译：

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多管制备 Co3Se4 包裹在 N 掺杂多壁碳纳米管缠结空心十二面体框架中，用于在良性条件下进行整体水分解

在这项工作中，提出了一种协同策略来合成用于中性水分解的高性能双功能电催化剂（标记为 Co ₃ Se ₄ /N-CNTs），其中 Co ₃ Se ₄纳米粒子被包裹在 N 掺杂的多壁碳纳米管中组装的空心十二面体框架。Co ₃ Se ₄ /N-CNTs的中性析氧反应（OER）和析氢反应（HER）催化性能通过调节纳米结构工程、元素掺杂和碳涂层得到最大程度的优化。在 1 m磷酸盐缓冲溶液 (PBS) 电解质中，Co ₃ Se ₄/N-CNTs 催化剂对 OER 和 HER 表现出优异的稳定性和催化活性，在分别为 385 和 102 mV 的相当低的过电位下产生 10 和 -10 mA cm ^-2的几何催化电流密度，同时连续运行 35 小时而没有明显的极化增加。这里值得一提的是，当组装中性电解槽时，Co ₃ Se ₄ /N-CNTs‖ Co ₃ Se ₄ /N-CNTs 电池为 1 m PBS 电解质中的整体水分解提供高性能，提供的电流密度为10 毫安厘米^-2在 1.75 V 的低外加电压下，显示出令人满意的运行稳定性，35 小时后无明显失活。催化性能可与在温和条件下操作的催化剂相媲美。因此，所有优点都承诺 Co ₃ Se ₄ /N-CNTs 是一种有吸引力的双功能催化剂，用于在环境友好条件下生产和储存间歇性可再生能源的氢燃料。