Electronic Configuration Regulation by N‐Doped MXenes Boosting Electrocatalytic Performance of Cobalt Phthalocyanine. Issue 7 (12th January 2023)

• Record Type: Journal Article
• Authors: Zhang, Wenlin; He, Tingting; Liu, Shimeng; Zhang, Lu‐Hua; Yu, Fengshou
• Is Part Of: European journal of inorganic chemistry. Volume 26:Issue 7(2023)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2023-01-12
• Subjects: Cobalt phthalocyanine -- Electronic structure -- MXene -- ORR -- Self-assembly; Chemistry, Inorganic -- Periodicals; Organometallic chemistry -- Periodicals; Bioinorganic chemistry -- Periodicals; Solid state chemistry -- Periodicals; 546
• DOI: 10.1002/ejic.202200489
• Languages: English
• ISSNs: 1434-1948

Abstract

Abstract: The precise control of electronic configurations of catalytic sites via molecular engineering is significantly desirable for boosting electrocatalytic activity. We reported a new‐type composite electrocatalyst with cobalt phthalocyanine supported on N‐doped MXene nanosheets (N‐MXene/CoPc) through a self‐assembly process. Beneficial from the joint action of N sites participation and axial coordination, N‐MXene/CoPc exhibits a high ORR activity with positive onset potential (Eonset =0.98 V vs. RHE) and half‐wave potential (E1/2 =0.863 V), which is superior over the pristine CoPc (E1/2 =0.72 V) and the composite with undoped MXene as support (MXene/CoPc, E1/2 =0.771 V). Additionally, N‐MXene/CoPc exhibits an excellent durability with only 8.5 % attenuation after 25000 s of continuous i‐t test, while a more obvious decay 18.6 % for 20 wt.% Pt/C. This work not merely reported a robust ORR catalyst, but more provides a reasonable design strategy for nonnoble‐metal catalysts through catalyst‐support interactions. Abstract : Cobalt phthalocyanine was supported on N‐doped MXene via axial coordination and π‐π stacking. The formed axial coordination configuration N−Co−N4 can effectively break the planar structure of Co‐N4 and enhance the oxygen reduction performance with an E1/2 of 0.863 V, which is better than the 20 wt.% Pt/C catalyst of 0.85 V.