{"id":1001,"date":"2025-12-25T05:59:16","date_gmt":"2025-12-25T05:59:16","guid":{"rendered":"https:\/\/en.esplaza.com.cn\/?p=1001"},"modified":"2025-12-25T05:59:16","modified_gmt":"2025-12-25T05:59:16","slug":"pv-redox-flow-battery-with-4-2-solar-to-electricity-conversion-efficiency","status":"publish","type":"post","link":"https:\/\/en.esplaza.com.cn\/index.php\/2025\/12\/25\/pv-redox-flow-battery-with-4-2-solar-to-electricity-conversion-efficiency\/","title":{"rendered":"PV redox flow battery with 4.2% solar-to-electricity conversion efficiency"},"content":{"rendered":"\n
\"\"<\/figure>\n\n\n\n

A research team from China\u2019s Nanjing Tech University (NanjingTech)<\/a> has developed and constructed a novel anthraquinone-based solar redox flow battery (SRFB) device.<\/p>\n\n\n\n

The system consists of redox couples known as 2,6-DBEAQ and K4[Fe(CN)6], paired with a single triple-junction amorphous-silicon photoelectrode. SRFBs are systems that combine a solar cell with a redox flow battery, enabling simultaneous capture of sunlight and storage of chemical energy.<\/p>\n\n\n\n

\u201cAmong the redox couples utilized in SRFBs, aqueous organic anthraquinone derivatives have gained recognition as the favored materials for energy storage,\u201d corresponding author Chengyu He told pv magazine<\/strong>. \u201cAnthraquinone-based SRFBs typically employ redox couples such as AQDS and 2,6-DHAQ, operating in both strongly acidic and alkaline conditions. However, due to the corrosion of photoelectrodes and the instability of the paired redox couple, these SRFB devices exhibit relatively low solar-to-output electricity efficiencies.\u201d<\/p>\n\n\n\n

For the photocathode part of the device, the group cut commercial triple-junction amorphous silicon (3jn-a-Si) photovoltaic cells into 2 cm \u00d7 2 cm pieces. The cell comprises stacked amorphous silicon\u2013germanium alloy junctions deposited on a stainless-steel substrate, topped with an indium tin oxide (ITO) layer. It is electrically connected via an external circuit to a carbon-felt counter-electrode.<\/p>\n\n\n\n

The photocathode is in chemical contact with the catholyte containing 2,6-DBEAQ, which is reduced during photo-charging. In contrast, the anolyte containing K\u2084[Fe(CN)\u2086] is oxidized at the carbon felt electrode. The two electrolytes flow continuously from external tanks through the cell using a peristaltic pump. They are kept separated by a Nafion ion-exchange membrane that allows ion transport to maintain charge balance but prevents electrolyte mixing.<\/p>\n\n\n\n

The performance of the SRFB device was assessed by a cyclic test, a repeated charge\u2013discharge experiment. Before the measurements, the electrolytes were purged with Argon for 30 minutes to eliminate the dissolved oxygen. During charging, the photocathode was irradiated with a xenon lamp simulating 1-sun intensity at 100 mW cm2. The device was discharged at a current density of 10 mA cm-2 until the battery voltage dropped to 0.2 V.<\/p>\n\n\n\n

\u201cThe SRFB device can be photo-charged without an external bias and discharged over 10 cycles, while the solar-to-output electricity efficiency reaches 4.3%,\u201d Chengyu He stated. \u201cThe successful preparation of this SRFB device opens up new possibilities for the further development of advanced solar-to-chemical energy conversion technologies.\u201d<\/p>\n\n\n\n

The results were presented in \u201cAn aqueous anthraquinone solar redox flow battery for efficient conversion and storage of solar energy<\/a>,\u201d published in Electrochimica Acta<\/em>.<\/p>\n","protected":false},"excerpt":{"rendered":"

A research team from China\u2019s Nanjing Tech University (NanjingTech) has developed and constructed a novel anthraquinone-based solar…<\/p>\n","protected":false},"author":2,"featured_media":1002,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1,5],"tags":[],"class_list":["post-1001","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-research","category-tech"],"_links":{"self":[{"href":"https:\/\/en.esplaza.com.cn\/index.php\/wp-json\/wp\/v2\/posts\/1001","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/en.esplaza.com.cn\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/en.esplaza.com.cn\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/en.esplaza.com.cn\/index.php\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/en.esplaza.com.cn\/index.php\/wp-json\/wp\/v2\/comments?post=1001"}],"version-history":[{"count":1,"href":"https:\/\/en.esplaza.com.cn\/index.php\/wp-json\/wp\/v2\/posts\/1001\/revisions"}],"predecessor-version":[{"id":1003,"href":"https:\/\/en.esplaza.com.cn\/index.php\/wp-json\/wp\/v2\/posts\/1001\/revisions\/1003"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/en.esplaza.com.cn\/index.php\/wp-json\/wp\/v2\/media\/1002"}],"wp:attachment":[{"href":"https:\/\/en.esplaza.com.cn\/index.php\/wp-json\/wp\/v2\/media?parent=1001"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/en.esplaza.com.cn\/index.php\/wp-json\/wp\/v2\/categories?post=1001"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/en.esplaza.com.cn\/index.php\/wp-json\/wp\/v2\/tags?post=1001"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}