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Fe‐Doped Ni 3 C Nanodots in N‐Doped Carbon Nanosheets for Efficient Hydrogen‐Evolution and Oxygen‐Evolution Electrocatalysis

2017; Wiley; Volume: 56; Issue: 41 Linguagem: Inglês

10.1002/anie.201706610

1521-3773

Haosen Fan, Hong Yu, Yufei Zhang, Yun Zheng, Yubo Luo, Zhengfei Dai, Bing Li, Yun Zong, Qingyu Yan,

MXene and MAX Phase Materials

Uniform Ni3 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 Ni3 C based nanosheets have lateral length of about 200 nm and thickness of 10 nm. When doped with Fe, the Ni3 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 Ni3 C nanosheets depict a low overpotential (292 mV) and a small Tafel slope (41.3 mV dec-1 ) 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-1 in KOH solution. Such nanodot-incorporated 2D hybrid structures can serve as an efficient bifunctional electrocatalyst for overall water splitting.