Colloidal Silver Diphosphide (AgP) Nanocrystals As Low Overpotential Catalysts for CO Reduction to Tunable Syngas

Overview

Journal Nat Commun

Specialty Biology

Date 2019 Dec 18

PMID 31844056

Citations 7

Authors

Hui Li

Peng Wen

Dominique S Itanze

Zachary D Hood

Xiao Ma

Michael Kim

Shiba Adhikari

Chang Lu

Chaochao Dun

Miaofang Chi

Yejun Qiu

Scott M Geyer

Affiliations

Soon will be listed here.

Abstract

Production of syngas with tunable CO/H ratio from renewable resources is an ideal way to provide a carbon-neutral feedstock for liquid fuel production. Ag is a benchmark electrocatalysts for CO-to-CO conversion but high overpotential limits the efficiency. We synthesize AgP nanocrystals (NCs) with a greater than 3-fold reduction in overpotential for electrochemical CO-to-CO reduction compared to Ag and greatly enhanced stability. Density functional theory calculations reveal a significant energy barrier decrease in the formate intermediate formation step. In situ X-ray absorption spectroscopy (XAS) shows that a maximum Faradaic efficiency is achieved at an average silver valence state of +1.08 in AgP NCs. A photocathode consisting of a np-Si wafer coated with ultrathin AlO and AgP NCs achieves an onset potential of 0.2 V vs. RHE for CO production and a partial photocurrent density for CO at -0.11 V vs. RHE (j) of -3.2 mA cm.

Citing Articles

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Toward high-efficiency photovoltaics-assisted electrochemical and photoelectrochemical CO reduction: Strategy and challenge.

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Wang C, Wang X, Ren H, Zhang Y, Zhou X, Wang J Nat Commun. 2023; 14(1):5108.

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Temperature-Controlled Syngas Production via Electrochemical CO Reduction on a CoTPP/MWCNT Composite in a Flow Cell.

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