School of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou, 510006, China.
School of Materials Science and Engineering, Nanyang Technological University, 639798, Singapore, Singapore.
Angew Chem Int Ed Engl. 2017 Oct 2;56(41):12566-12570. doi: 10.1002/anie.201706610. Epub 2017 Sep 5.
Uniform Ni C nanodots dispersed in ultrathin N-doped carbon nanosheets were successfully prepared by carburization of the two dimensional (2D) nickel cyanide coordination polymer precursors. The Ni C based nanosheets have lateral length of about 200 nm and thickness of 10 nm. When doped with Fe, the Ni C based nanosheets exhibited outstanding electrocatalytic properties for both the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). For example, 2 at % Fe (atomic percent) doped Ni C nanosheets depict a low overpotential (292 mV) and a small Tafel slope (41.3 mV dec ) for HER in KOH solution. An outstanding OER catalytic property is also achieved with a low overpotential of 275 mV and a small Tafel slope of 62 mV dec in KOH solution. Such nanodot-incorporated 2D hybrid structures can serve as an efficient bifunctional electrocatalyst for overall water splitting.
通过二维（2D）镍氰化物配位聚合物前体的碳化成功制备了均匀分散在超薄氮掺杂碳纳米片中的 Ni C 纳米点。Ni C 基纳米片的横向长度约为 200nm，厚度为 10nm。当掺杂 Fe 时，Ni C 基纳米片在析氢反应（HER）和析氧反应（OER）中均表现出优异的电催化性能。例如，掺杂 2at%Fe（原子百分比）的 Ni C 纳米片在 KOH 溶液中表现出低过电势（292mV）和小 Tafel 斜率（41.3mVdec）的 HER。在 KOH 溶液中，也实现了优异的 OER 催化性能，过电势低至 275mV，Tafel 斜率小至 62mVdec。这种纳米点嵌入的二维混合结构可用作整体水分解的高效双功能电催化剂。
