Abstract
The development of effective and low-cost catalysts for overall water splitting is essential for clean production of hydrogen from water. In this paper, we report the synthesis of cobalt-vanadium (Co-V) bimetal-based catalysts for the effective water splitting. The Co2V2O7·xH2O nanoplates containing both Co and V elements were selected as the precursors. After the calcination under NH3 atmosphere, the Co2VO4 and Co/VN could be obtained just by tuning the calcination temperature. Electrochemical tests indicated that the Co-V bimetal-based materials could be used as active hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) catalyst by regulating their structure. The Co/VN showed good performance for HER with the onset potential of 68 mV and can achieve a current density of 10 mA cm−2 at an overpotential of 92 mV. Meanwhile, the Co2VO4 exhibited the obvious OER performance with overpotential of 300 mV to achieve a current density of 10 mA cm−2. When the Co2VO4 and Co/VN were used as the anode and cathode in a two-electrode system, respectively, the cell needed a voltage of 1.65 V to achieve 10 mA cm−2 together with good stability. This work would be indicative to constructing Co-V bimetalbased catalysts for the catalytic application.
摘要
开发高效的全解水催化剂对于使用清洁水为原料制氢十分必要. 本文设计合成了钴-钒基双金属纳米片用作分解水的有效催化剂.合成中采用Co2V2O7·xH2O作为前驱体, 在氨气氛围下可控热处理获得组成可调的钴-钒基双金属(Co2VO4和Co/VN)纳米片. 电化学测试结果表明Co-V双金属基催化剂可作为活性的产氧和产氢催化剂. Co/VN具有较好的HER性能, 起始电位为68 mV, 电流密度为10 mA cm−2时电压为92 mV. 而Co2VO4具有较好的OER性能, 电流密度为10 mA cm−2时电压为300 mV. 使用Co/VN和Co2VO4分别作为阴极和阳极构建两电极电解池, 当电压为1.65 V时, 电流密度即可达到10 mA cm−2. 因此, 组分可调的Co-V双金属纳米片在催化领域中具有很好的应用
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Acknowledgements
This work was supported by the Key Program Projects of the National Natural Science Foundation of China (21631004), the National Natural Science Foundation of China (21601055, 21571054 and 21401048), the Natural Science Foundation of Heilongjiang Province (B2017008), and Heilongjiang University Excellent Youth Foundation.
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Author contributions Fu H and Tian C designed and engineered this work; Xiao Y carried out the experiments. Tian C, Xiao Y and Fu H wrote this paper. All authors contributed to the general discussion.
Conflict of interest The authors declare that they have no conflict of interest.
Supplementary information Experimental details and supporting data are available in the online version of the paper.
Yinglu Xiao received her BSc degree from Harbin University in 2015. She is currently a master candidate at Heilongjiang University under the guidance of Profs. Chungui Tian and Honggang Fu. Her research is focused on the design and synthesis of vanadium-based catalysts for HER and OER.
Chungui Tian received his BSc degree in 1997 from Inner Mongolia University for Nationalities. In 2004 and 2007, he received his MSc and PhD degrees both from Northeast Normal University under the guidance of Prof. Enbo Wang. Then, he joined Heilongjiang University as a lecturer. He became an assistant professor and a full professor in 2009 and 2014, respectively. His research interests focus on designed synthanis and electrocatalytic application of W (Mo,V)-based materials.
Honggang Fu received his BSc degree in 1984 and MSc degree in 1987 from Jilin University, China. He joined Heilongjiang University as an assistant professor in 1988. In 1999, he received his PhD degree from Harbin Institute of Technology, China. He became a full professor in 2000. Currently, he is Cheung Kong Scholar Professor. His interests focus on the oxide-based nanomaterials for solar energy conversion and photocatalysis, the carbon-based nanomaterials for energy conversion and storage, and electrocatalysis.
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Xiao, Y., Tian, C., Tian, M. et al. Cobalt-vanadium bimetal-based nanoplates for efficient overall water splitting. Sci. China Mater. 61, 80–90 (2018). https://doi.org/10.1007/s40843-017-9113-1
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DOI: https://doi.org/10.1007/s40843-017-9113-1