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Li Y, Ding C, Li Y, Zeng J, Kang C, Chen H, Wang L, He J, Li C. Engineering the Inhomogeneity of Metal-Insulator-Semiconductor Junctions for Photoelectrochemical Methanol Oxidation. ACS APPLIED MATERIALS & INTERFACES 2023; 15:59403-59412. [PMID: 38104346 DOI: 10.1021/acsami.3c12957] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/19/2023]
Abstract
Si-based inhomogeneous metal-insulator-semiconductor (MIS) junctions with a discontinuous metal nanostructure on the Si/insulator layer are expected to be efficient photoelectrodes for solar energy conversion. However, the formation of a metal nanostructure with an optimized arrangement on semiconductors for efficient charge carrier collection is still a big challenge. Herein, we report a method for the in situ formation of an n-Si inhomogeneous MIS junction with well-dispersed metal nanocontacts through a self-assembly process during photoelectrochemical (PEC) methanol oxidation. The photovoltage shows a strong dependence on the inhomogeneity of the n-Si MIS junction, which can be precisely tuned by the applied electrode potential and operation time. The appropriate inhomogeneity of the Schottky junction as well as the high barrier regions induced by the metal oxide/(oxy)hydroxide layer synergistically produces a large photovoltage of 500 mV for the n-Si inhomogeneous MIS junction. Finally, the n-Si-based photoanode is coupled with a CO2-to-formate reaction to realize the production of formate at both electrodes, resulting in a high faradic efficiency (FE) of 86 and 93% for anode and cathode reactions at an operational current of 30 mA/cm2, respectively. These findings provide important insights into the design of highly efficient inhomogeneous MIS junctions through an in situ self-assembly route for solar energy conversion and storage.
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Affiliation(s)
- Yanming Li
- School of Materials, Sun Yat-sen University, Guangdong 518107, Shenzhen, P. R. China
| | - Chenglong Ding
- School of Materials, Sun Yat-sen University, Guangdong 518107, Shenzhen, P. R. China
| | - Yao Li
- School of Materials, Sun Yat-sen University, Guangdong 518107, Shenzhen, P. R. China
| | - Jiahong Zeng
- School of Materials, Sun Yat-sen University, Guangdong 518107, Shenzhen, P. R. China
| | - Caitao Kang
- School of Materials, Sun Yat-sen University, Guangdong 518107, Shenzhen, P. R. China
| | - Honglei Chen
- School of Materials, Sun Yat-sen University, Guangdong 518107, Shenzhen, P. R. China
| | - Lan Wang
- School of Materials, Sun Yat-sen University, Guangdong 518107, Shenzhen, P. R. China
| | - Jingfu He
- School of Materials, Sun Yat-sen University, Guangdong 518107, Shenzhen, P. R. China
| | - Changli Li
- School of Materials, Sun Yat-sen University, Guangdong 518107, Shenzhen, P. R. China
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Liu Y, Li W, Zhao G, Qin G, Li Y, Liu Y. Self-driven microstructural evolution of Au@Pd core-shell nanoparticles for greatly enhanced catalytic performance during methanol electrooxidation. NANOSCALE 2021; 13:3528-3542. [PMID: 33491724 DOI: 10.1039/d0nr07135h] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
The lack of direct insight into the microstructural evolution of catalytic materials under electrochemical polarization has inhibited the development of heterogeneous catalysts. By investigating a typical Au@Pd core-shell nanostructure, the present study discloses the microstructural evolution of heterogeneous catalytic materials during the methanol electrooxidation reaction (MOR). The electrocatalytic activity of the as-prepared Au@Pd_core-shell nanoparticles continuously increased during the first 100 successive voltammetry cycles of the MOR. Microstructural characterization studies revealed that during the MOR, an Au/Pd mixed bimetallic shell was formed by the self-driven microstructural evolution of the Au@Pd_core-shell nanoparticles. Both the experimental and calculation results indicated that the Au/Pd mixed bimetallic shell reduced the binding strength of OH- and CO on the catalyst surface. The exposed Au atoms in the shell region also produced large-scale reactive ˙OH radicals that facilitated the oxidative removal of the adsorbed carbonaceous species from the adjacent Pd active sites.
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Affiliation(s)
- Yaxing Liu
- Shanxi Key Laboratory of Nano Functional Composite Materials, North University of China, Taiyuan, 030051, P. R. China.
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