Journal
ACS CATALYSIS
Volume 10, Issue 3, Pages 2060-2068Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.9b04099
Keywords
electron source; biomass; valorization; solar-to-chemical energy conversion; electrochemistry
Categories
Funding
- Technology Development Program to Solve Climate Changes through the National Research Foundation of Korea (NRF) - Ministry of Science and ICT of Korea [2017M1A2A2087630, 2019M1A2A2065616]
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Power- and solar-to-chemical energy conversion has been spotlighted as a promising technology for the efficient use of renewable energy resources. In principle, various chemicals can be sustainably produced through (photo)electrochemical reduction using water as a cheap and clean electron source. However, oxidation of water is a challenging task that results in low energy efficiency and reliability issues for the practical application of power- and solar-to-chemical energy conversion. Here, we show that various biomasses including lignin can be used as alternative electron sources. Electrons can be readily extracted from biomass using phosphomolybdic acid as a catalyst for oxidative depolymerization of biomass and an electron mediator at a much lower potential (0.95 V vs reversible hydrogen electrode) than water using best-performing but expensive catalysts (1.5-1.6 V). In particular, value-added chemicals such as CO and vanillin are produced as by-products upon oxidative depolymerization of lignin. As a result, this approach allows efficient (photo)electrochemical production of hydrogen with a Faradaic efficiency close to unity at acidic pHs and brings additional economic benefits from by-products.
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