Catalysts capable of improving the performance of oxygen evolution reaction (OER) and oxygen reduction reactions (ORR) are essential for the advancement of renewable energy technologies. Herein, Ag-decorated vertically aligned MoS₂ nanoflakes are developed via magnetron co-sputtering and investigated as electrocatalyst towards OER and ORR. Due to the presence of silver, the catalyst shows more than 1.5 times an increase in the roughness-normalized rate of OER, featuring a very low Tafel slope (58.6 mv dec^-1), thus suggesting that the catalyst surface favors the thermodynamics of hydroxyl radical (OH•) adsorption with the deprotonation steps being the rate-determining steps. The improved performance is attributed to the strong interactions between OOH intermediates and the Ag surface which reduces the activation energy. Rotating ring disk electrode (RRDE) analysis shows that the net disk currents on the Ag-MoS₂ sample are two times higher at 0.65 V compared to MoS₂, demonstrating the co-catalysis effect of silver doping. Based on the rate constant values, Ag-MoS₂ proceeds through a mixed 4 electron and a 2+2 serial route reduction mechanism, in which the ionized hydrogen peroxide is formed as a mobile intermediate. The presence of silver decreases the electron transfer number and increases the peroxide yield due to the interplay of a 2+2 electron reduction pathway. A 2.5 - 6 times faster conversion rate of peroxide to OH^- observed due to the presence of silver, indicating its effective cocatalyst nature. This strategy can help in designing a highly active bifunctional catalyst that has great potential as a viable alternative to precious-metal-based catalysts.

能够改善氧释放反应（OER）和氧还原反应（ORR）性能的催化剂对于可再生能源技术的发展至关重要。本文中，通过磁控共溅射开发了装饰有Ag的垂直排列的MoS ₂纳米薄片，并研究了其作为面向OER和ORR的电催化剂。由于存在银，该催化剂的OER粗糙度归一化速率提高了1.5倍以上，其塔菲尔斜率非常低（58.6 mv dec ^-1），因此表明催化剂表面有利于羟基自由基（OH•）吸附的热力学，而去质子化步骤是速率确定步骤。性能的提高归因于OOH中间体与Ag表面之间的强相互作用，从而降低了活化能。旋转环盘电极（RRDE）分析表明，在Ag-MOS净磁盘电流₂样品是在0.65 V两次更高相比的MoS ₂，表明银掺杂的共催化效果。根据速率常数值，Ag-MoS ₂通过混合的4电子和2 + 2串联还原反应机理进行反应，其中离子化的过氧化氢形成为移动中间体。由于2 + 2电子还原途径的相互作用，银的存在降低了电子转移数并提高了过氧化物的收率。2.5 -过氧化物的快6倍的转化率，以OH ^-由于观察到银的存在，这表明它的有效助催化剂的性质。该策略可帮助设计具有高潜力的高活性双功能催化剂，作为贵金属基催化剂的可行替代品。