Exploring a Ni–N4 Active Site‐Based Conjugated Microporous Polymer Z‐Scheme Heterojunction Through Covalent Bonding for Visible Light‐Driven Photocatalytic CO2 Conversion in Pure Water

Author:

Li Shanshan1,Yu Haihan1,Wang Yuwen2,Wang Shuai1,Zhang Lina2,Zhu Peihua1,Gao Chaomin1ORCID,Yu Jinghua1

Affiliation:

1. School of Chemistry and Chemical Engineering University of Jinan Jinan 250022 China

2. Shandong Provincial Key Laboratory of Preparation and Measurement of Building Materials University of Jinan Jinan 250022 China

Abstract

AbstractDesigning photocatalysts with efficient charge transport and abundant active sites for photocatalytic CO2 reduction in pure water is considered a potential approach. Herein, a nickel‐phthalocyanine containing Ni–N4 active sites‐based conjugated microporous polymer (NiPc‐CMP), offering highly dispersed metal active sites, satisfactory CO2 adsorption capability, and excellent light harvesting properties, is engineered as a photocatalyst. By virtue of the covalently bonded bridge, an atomic‐scale interface between the NiPc‐CMP/Bi2WO6 Z‐scheme heterojunction with strong chemical interactions is obtained. The interface creates directional charge transport highways and retains a high redox potential, thereby enhancing the photoexcited charge carrier separation and photocatalytic efficiency. Consequently, the optimal NiPc‐CMP/Bi2WO6 (NCB‐3) achieves efficient photocatalytic CO2 reduction performance in pure water under visible‐light irradiation without any sacrificial agent or photosensitizer, affording a CO generation rate of 325.9 µmol g−1 with CO selectivity of 93% in 8 h, outperforming those of Bi2WO6 and NiPc‐CMP, individually. Experimental and theoretical calculations reveal the promotion of interfacial photoinduced electron separation and the role of Ni–N4 active sites in photocatalytic reactions. This study presents a high‐performance CMP‐based Z‐scheme heterojunction with an effective interfacial charge‐transfer route and rich metal active sites for photocatalytic CO2 conversion.

Funder

National Natural Science Foundation of China

China Postdoctoral Science Foundation

Natural Science Foundation of Shandong Province

Science and Technology Support Plan for Youth Innovation of Colleges and Universities of Shandong Province of China

Publisher

Wiley

Subject

Biomaterials,Biotechnology,General Materials Science,General Chemistry

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