Atomically dispersed nickel–nitrogen–sulfur species anchored on porous carbon nanosheets for efficient water oxidation

Yang Hou (), Ming Qiu, Min Gyu Kim, Pan Liu, Gyutae Nam, Tao Zhang, Xiaodong Zhuang, Bin Yang, Jaephil Cho, Mingwei Chen, Chris Yuan, Lecheng Lei and Xinliang Feng ()
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Yang Hou: Zhejiang University
Ming Qiu: Central China Normal University
Min Gyu Kim: Pohang Accelerator Laboratory
Pan Liu: Tohoku University
Gyutae Nam: Ulsan National Institute of Science and Technology (UNIST)
Tao Zhang: Technische Universitaet Dresden
Xiaodong Zhuang: Technische Universitaet Dresden
Bin Yang: Zhejiang University
Jaephil Cho: Ulsan National Institute of Science and Technology (UNIST)
Mingwei Chen: Tohoku University
Chris Yuan: Case Western Reserve University
Lecheng Lei: Zhejiang University
Xinliang Feng: Technische Universitaet Dresden

Nature Communications, 2019, vol. 10, issue 1, 1-9

Abstract: Abstract Developing low-cost electrocatalysts to replace precious Ir-based materials is key for oxygen evolution reaction (OER). Here, we report atomically dispersed nickel coordinated with nitrogen and sulfur species in porous carbon nanosheets as an electrocatalyst exhibiting excellent activity and durability for OER with a low overpotential of 1.51 V at 10 mA cm−2 and a small Tafel slope of 45 mV dec−1 in alkaline media. Such electrocatalyst represents the best among all reported transition metal- and/or heteroatom-doped carbon electrocatalysts and is even superior to benchmark Ir/C. Theoretical and experimental results demonstrate that the well-dispersed molecular S|NiNx species act as active sites for catalyzing OER. The atomic structure of S|NiNx centers in the carbon matrix is clearly disclosed by aberration-corrected scanning transmission electron microscopy and synchrotron radiation X-ray absorption spectroscopy together with computational simulations. An integrated photoanode of nanocarbon on a Fe2O3 nanosheet array enables highly active solar-driven oxygen production.

Date: 2019
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DOI: 10.1038/s41467-019-09394-5

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