TY - JOUR
T1 - Highly active M2P2O7@NC (M = Co and Zn) for bifunctional electrocatalysts for ORR and HER
AU - Xu, Lian Hua
AU - Zeng, Hai Bo
AU - Zhang, Xue Ji
AU - Cosnier, S.
AU - Marks, Robert S.
AU - Shan, Dan
N1 - Funding Information:
This research was supported by National Natural Science Foundation of China (Grant No. 21675086 ), the Fundamental Research Funds for the Central Universities (No. 30918012202 ), and a project founded by the priority academic program development of Jiangsu Higher Education Institutions (PAPD) . The authors wish also to acknowledge the support from the Sino-French international research network “New nanostructured materials and biomaterials for renewable electrical energy sources” for providing facilities.
Publisher Copyright:
© 2019 Elsevier Inc.
PY - 2019/9/1
Y1 - 2019/9/1
N2 - Tuning the coordination environment between metal centers and organic ligands is a promising way to design of the precursors of electrocatalysts for water splitting or other renewable energy options. In this work, a novel coordinated polymer was prepared feasibly in polyvinyl pyrrolidone (PVP) aqueous solution using aminotrimethylene phosphonic acid (ATMP, L1) and 2-methylimidazole (MeMI, L2) as ligands with the ratio of 2:5, Co2+ and Zn2+ as metal centers. Based on the concept of acid-base neutralization reaction, the proton-transfer induced “deprotonation and protonation” for L1 and L2, respectively. Thus, the coordination was dominated by the deprotonated L1. Owing to also partial of protonated L2 adsorbed as “counter ions”, carbonization of the obtained precursor at 800 °C under N2 atmosphere endows the pyrolysis product with nitrogen-doped carbon supported metal pyrophosphate (M2P2O7@NC). Thus, the resulting M2P2O7@NC exhibits the enhanced and durable ORR and HER performance. For ORR in 0.1 M KOH, an enhanced onset potential (0.925 V vs. RHE), half wave potential (0.793 V vs. RHE) and diffusion limiting current (6.132 mA cm−2) can be obtained comparable to those of Pt/C. For HER in 0.5 M H2SO4, it only needs an over potential of 180 mV to realize a current density of 10 mA cm−2.
AB - Tuning the coordination environment between metal centers and organic ligands is a promising way to design of the precursors of electrocatalysts for water splitting or other renewable energy options. In this work, a novel coordinated polymer was prepared feasibly in polyvinyl pyrrolidone (PVP) aqueous solution using aminotrimethylene phosphonic acid (ATMP, L1) and 2-methylimidazole (MeMI, L2) as ligands with the ratio of 2:5, Co2+ and Zn2+ as metal centers. Based on the concept of acid-base neutralization reaction, the proton-transfer induced “deprotonation and protonation” for L1 and L2, respectively. Thus, the coordination was dominated by the deprotonated L1. Owing to also partial of protonated L2 adsorbed as “counter ions”, carbonization of the obtained precursor at 800 °C under N2 atmosphere endows the pyrolysis product with nitrogen-doped carbon supported metal pyrophosphate (M2P2O7@NC). Thus, the resulting M2P2O7@NC exhibits the enhanced and durable ORR and HER performance. For ORR in 0.1 M KOH, an enhanced onset potential (0.925 V vs. RHE), half wave potential (0.793 V vs. RHE) and diffusion limiting current (6.132 mA cm−2) can be obtained comparable to those of Pt/C. For HER in 0.5 M H2SO4, it only needs an over potential of 180 mV to realize a current density of 10 mA cm−2.
KW - Aminotrimethylene phosphonic acid (ATMP)
KW - Hydrogen evolution reaction (HER)
KW - Oxygen reduction reaction (ORR)
KW - Proton transfer
KW - Pyrophosphate
UR - http://www.scopus.com/inward/record.url?scp=85069632775&partnerID=8YFLogxK
U2 - 10.1016/j.jcat.2019.07.013
DO - 10.1016/j.jcat.2019.07.013
M3 - Article
AN - SCOPUS:85069632775
SN - 0021-9517
VL - 377
SP - 20
EP - 27
JO - Journal of Catalysis
JF - Journal of Catalysis
ER -