Chinese Journal of Catalysis ›› 2024, Vol. 63: 282-291.
• Articles • Previous Articles
Yunying Huoa,1, Cong Guoa,1, Yongle Zhanga, Jingyi Liua, Qiao Zhanga,*(), Zhiting Liua, Guangxing Yanga, Rengui Lib,*(), Feng Penga,*()
Received:
2024-06-10
Accepted:
2024-06-24
Online:
2024-08-18
Published:
2024-08-19
Contact:
*E-mail: zhangqiao@gzhu.edu.cn (Q. Zhang), rgli@dicp.ac.cn (R. Li), fpeng@gzhu.edu.cn (F. Peng).
About author:
1Contributed equally to this work.
Supported by:
Yunying Huo, Cong Guo, Yongle Zhang, Jingyi Liu, Qiao Zhang, Zhiting Liu, Guangxing Yang, Rengui Li, Feng Peng. Realizing efficient electrochemical oxidation of 5-hydroxymethylfurfural on a freestanding Ni(OH)2/nickel foam catalyst[J]. Chinese Journal of Catalysis, 2024, 63: 282-291.
Fig. 1. (a) The schematic diagram of nickel foam. SEM (b) and TEM (c,d) images of Ni(OH)2/NF. The EDS mapping images (e), Ni 2p (f) and O 1s (g) peaks of NF and Ni(OH)2/NF.
Fig. 2. (a) CV curves of NF and Ni(OH)2/NF in 1 mol L-1 KOH at a scan rate of 10 mV s-1. (b) LSV curves of Ni(OH)2/NF in 1 mol L-1 KOH with and without HMF (10 mmol L-1). (c,d) Tafel plot and the electrochemical double-layer capacitance of NF and Ni(OH)2/NF electrodes. (e) HPLC traces of electrochemical HMF oxidation catalyzed by Ni(OH)2/NF at 1.45 V (vs. RHE). (f) Reactant and products concentration-reaction time plots for electrochemical HMF oxidation catalyzed by Ni(OH)2/NF under a 1.45 V (vs. RHE). (g) The HMF conversion, the yield and Faradaic efficiency FDCA based on Ni(OH)2/NF electrode at different potentials. (h) The HMF conversion, the yield and the Faradaic efficiency of FDCA based on NF and Ni(OH)2/NF at 1.45 V (vs. RHE). (i) The HMF conversion, the yield and Faradaic efficiency of FDCA obtained by Ni(OH)2/NF electrode for five consecutive cycles of HMFOR.
Fig. 3. SEM (a), EDS mapping (b) and HRTEM (c) images of Ni(OH)2/NF after reaction. XRD patterns (d), Ni 2p (e) and O 1s (f) peak of Ni(OH)2/NF before and after electrochemical reaction.
Fig. 4. Bode phase plots of the in-situ EIS on Ni(OH)2/NF without 10 mmol L-1 HMF (a) and with 10 mmol L-1 HMF (b). In situ Raman spectra of Ni(OH)2/NF electrode during OER (without 10 mmol L-1 HMF) (c) and HMFOR (with 10 mmol L-1 HMF) (d) under increasing potential from OCP to 1.55 V. (e) Multipotential step curves of the Ni(OH)2/NF electrode. (f) Schematic illustration of the surface reconstruction and reaction mechanism.
Fig. 5. Continuous-flow electrolysis. (a) Electrolysis setup for HMFOR in a continuous-flow electrolytic cell. (b) FDCA productivity based on Ni(OH)2/NF at different potentials, different volume flows in a continuous-flow electrolytic cell. (c,d) HMF conversion, the yield and the productivity of FDCA obtained by Ni(OH)2/NF electrode for six consecutive cycles of HMFOR in a continuous-flow electrolytic cell.
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