Amorphous nickel-cobalt complexes hybridized with 1T-phase molybdenum disulfide via hydrazine-induced phase transformation for water splitting

Haoyi Li, Shuangming Chen, Xiaofan Jia, Biao Xu, Haifeng Lin, Haozhou Yang, Li Song and Xun Wang ()
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Haoyi Li: Key Lab of Organic Optoelectronics and Molecular Engineering, Tsinghua University
Shuangming Chen: National Synchrotron Radiation Laboratory, CAS Center for Excellence in Nanoscience, University of Science and Technology of China
Xiaofan Jia: University of Virginia
Biao Xu: Iowa State University
Haifeng Lin: Key Lab of Organic Optoelectronics and Molecular Engineering, Tsinghua University
Haozhou Yang: Key Lab of Organic Optoelectronics and Molecular Engineering, Tsinghua University
Li Song: National Synchrotron Radiation Laboratory, CAS Center for Excellence in Nanoscience, University of Science and Technology of China
Xun Wang: Key Lab of Organic Optoelectronics and Molecular Engineering, Tsinghua University

Nature Communications, 2017, vol. 8, issue 1, 1-11

Abstract: Abstract Highly active and robust eletcrocatalysts based on earth-abundant elements are desirable to generate hydrogen and oxygen as fuels from water sustainably to replace noble metal materials. Here we report an approach to synthesize porous hybrid nanostructures combining amorphous nickel-cobalt complexes with 1T phase molybdenum disulfide (MoS2) via hydrazine-induced phase transformation for water splitting. The hybrid nanostructures exhibit overpotentials of 70 mV for hydrogen evolution and 235 mV for oxygen evolution at 10 mA cm−2 with long-term stability, which have superior kinetics for hydrogen- and oxygen-evolution with Tafel slope values of 38.1 and 45.7 mV dec−1. Moreover, we achieve 10 mA cm−2 at a low voltage of 1.44 V for 48 h in basic media for overall water splitting. We propose that such performance is likely due to the complete transformation of MoS2 to metallic 1T phase, high porosity and stabilization effect of nickel-cobalt complexes on 1T phase MoS2.

Date: 2017
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DOI: 10.1038/ncomms15377

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