Atomically dispersed Ni/NixSy anchored on doped mesoporous networked carbon framework: Boosting the ORR performance in alkaline and acidic media.,Journal of Colloid and Interface Science

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Atomically dispersed Ni/NixSy anchored on doped mesoporous networked carbon framework: Boosting the ORR performance in alkaline and acidic media.
Journal of Colloid and Interface Science ( IF 9.4 ) Pub Date : 2020-03-20 , DOI: 10.1016/j.jcis.2020.03.043
Alekha Tyagi ₁ , Kamal K Kar ₂ , Hiroyuki Yokoi ₃

Affiliation

Rational and strategic fabrication of cost-effective, active and durable oxygen reduction reaction (ORR) electrocatalyst is the bottle-neck for the commercialization of fuel cells and metal-air batteries. Atomically dispersed nickel (Ni)/nickel sulfide (NixSy) anchored on heteroatom doped networked hierarchical porous carbonaceous sheets are synthesized from nickel nitrate and guanidine thiocyanate. The sample annealed at 750 °C followed by acid-treatment (Ni-GT-750-A) emerges as the best performing pH-universal ORR catalyst with an onset potential of 0.91 (0.1 M KOH) and 0.89 V (0.1 M HClO4) vs. reversible hydrogen electrode (RHE). It also exhibits better current durability (95.0 and 60%) and methanol tolerance (90.6 and 80.3%) in comparison to the commercial catalyst (65.0, 27, -33.0 and 16.5%) in alkaline and acidic media, respectively. An insight into the microstructure and ORR-active chemical sites is obtained with the aid of electron microscopic (FE-SEM and HR-TEM) and physiochemical (sorption isotherm, XRD, Raman and XPS) studies, respectively. The enhanced activity results from the synergistic influence of metallic ORR-active sites in hierarchical porous doped defective carbon support, which provides the well-interlinked conducting channel for electron transfer and additional ORR-active sites. The introduced electrocatalyst establishes Ni decorated doped carbon systems as potential revolutionary substitutes for commercial systems.

中文翻译：

原子分散的Ni / NixSy固定在掺杂的介孔网络碳骨架上：增强ORR在碱性和酸性介质中的性能。

合理，战略性地制造具有成本效益的，活性和持久性的氧还原反应（ORR）电催化剂是燃料电池和金属空气电池商业化的瓶颈。由硝酸镍和硫氰酸胍合成了原子分散的镍（Ni）/硫化镍（NixSy），其锚定在杂原子掺杂的网状分层多孔碳质薄片上。在750°C退火然后酸处理（Ni-GT-750-A）的样品成为表现最佳的pH通用ORR催化剂，其起始电位为0.91（0.1 M KOH）和0.89 V（0.1 M HClO4）与可逆氢电极（RHE）。与在碱性和酸性介质中的市售催化剂（分别为65.0、27，-33.0和16.5％）相比，它还具有更好的电流耐久性（95.0和60％）和甲醇耐受性（90.6和80.3％）。分别借助电子显微镜（FE-SEM和HR-TEM）和物理化学（吸附等温线，XRD，拉曼和XPS）研究获得了对微观结构和ORR活性化学位点的了解。增强的活性归因于分层多孔掺杂缺陷碳载体中金属ORR活性位点的协同影响，这为电子转移和其他ORR活性位点提供了良好互连的导电通道。引入的电催化剂将镍装饰的碳系统确立为商业系统的潜在革命性替代品。增强的活性归因于分层多孔掺杂缺陷碳载体中金属ORR活性位点的协同影响，这为电子转移和其他ORR活性位点提供了良好互连的导电通道。引入的电催化剂将镍装饰的掺杂碳体系确立为商业体系的潜在革命性替代品。增强的活性归因于分层多孔掺杂缺陷碳载体中金属ORR活性位点的协同影响，这为电子转移和其他ORR活性位点提供了良好互连的导电通道。引入的电催化剂将镍装饰的掺杂碳体系确立为商业体系的潜在革命性替代品。

更新日期：2020-03-21

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