Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education of the People's Republic of China , Heilongjiang University , Harbin 150080 , P. R. China.
State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry , Jilin University , Changchun 130012 , P. R. China.
ACS Appl Mater Interfaces. 2018 Mar 28;10(12):9999-10010. doi: 10.1021/acsami.7b16167. Epub 2018 Mar 14.
A simple and feasible strategy was reported to construct NiP nanostructures entwined by graphite layers (NiP/GC). In this process, a commercial amino phosphonic acid chelating resin was adopted as both the phosphorus and carbon resources. Then, Ni was introduced into the resin framework via ionic exchange and chelation to form a resin-Ni precursor. After carbonization, the highly dispersed NiP particles, coupled with thin graphite layers, were simultaneously synthesized in situ. A ternary 7.5% Pt-NiP/GC catalyst was further obtained by loading 7.5 wt % Pt on NiP/GC. For the oxygen reduction reaction in acidic media, the 7.5% Pt-NiP/GC catalyst exhibited even more positive onset (1.03 V) and half-wave (0.93 V) potentials, as well as a rather higher mass activity of 565.3 mA mg and a better long-term stability than those of the commercial 20% Pt/C (JM) electrocatalyst. The improved reaction kinetics is mainly attributed to the synergistic effect between Pt and NiP/GC. This work not only provides a method for the synthesis of phosphides but also gives insight into the synergy between Pt and NiP, which is helpful for the development of more low-Pt catalysts in acidic media.
一种简单可行的策略被报道用于构建由石墨层缠绕的 NiP 纳米结构（NiP/GC）。在这个过程中，采用了一种商业的氨基膦酸螯合树脂作为磷和碳资源。然后，Ni 通过离子交换和螯合引入到树脂骨架中，形成树脂-Ni 前体。碳化后，高度分散的 NiP 颗粒与薄石墨层同时原位合成。进一步通过在 NiP/GC 上负载 7.5wt%Pt，得到三元 7.5%Pt-NiP/GC 催化剂。对于酸性介质中的氧还原反应，7.5%Pt-NiP/GC 催化剂表现出更正的起始（1.03V）和半波（0.93V）电位，以及更高的质量活性（565.3mA mg）和更好的长期稳定性，优于商用的 20%Pt/C（JM）电催化剂。反应动力学的提高主要归因于 Pt 和 NiP/GC 之间的协同效应。这项工作不仅提供了一种合成磷化物的方法，还深入了解了 Pt 和 NiP 之间的协同作用，这有助于在酸性介质中开发更多低 Pt 催化剂。
