Chae, Sang Youn Yoon, Noyoung Jun, Minki Hur, Sung Hyun Lee, Myeongjae Kim, Bongsoo Kim, Jin Young Park, Eun Duck Park, Jong Hyeok Joo, Oh Shim 2024-09-14T07:00:05Z 2024-09-14T07:00:05Z 2024-09-13 2024-10 https://pubs.kist.re.kr/handle/201004/150591 Photoelectrochemical (PEC) cells offer a promising method for producing green hydrogen through the splitting of water using solar energy. However, the cost-effective synthesis of highly crystalline p-type semiconductor materials for PEC cells remains a significant challenge for industrial applications. Herein, a CuInS2 photoelectrode is fabricated using a scalable and economical wet chemical spin-coating technique. To enhance the crystallinity and photoelectrochemical activity of the photoelectrode, the grain size is precisely controlled by adjusting the atomic ratio, thickness, morphology, and Ag doping. Evaluating a novel growth mechanism of CuInS2 from Cu-In-O reveals that Ag doping significantly promotes grain growth. Consequently, the CuInS2 photocathode achieves one of the highest photoelectrochemical activities (-9.8 mA cm(-2) at 0 V-RHE) reported for CuInS2 photoelectrodes synthesized via wet chemical methods. Bias-free water splitting is achieved using a CuInS2-based photoelectrode in a photovoltaic-PEC cell configuration. These results highlight the potential of CuInS2, prepared through wet chemical methods, for cost-effective photoelectrochemical water splitting. English WILEY-V C H VERLAG GMBH Investigation of Grain Growth in Chalcopyrite CuInS2 Photoelectrodes Synthesized under Wet Chemical Conditions for Bias-Free Photoelectrochemical Water Splitting Article 10.1002/solr.202400518 1 Solar RRL, v.8, no.20 Solar RRL 8 20 N scie scopus 001298262000001 2-s2.0-85201939017 Energy & Fuels Materials Science, Multidisciplinary Energy & Fuels Materials Science Article TO-HYDROGEN CONVERSION NOBLE-METAL COCATALYST TANDEM CELL EFFICIENT PHOTOCATHODES PHOTOANODE OXIDE CU STANDALONE NANOSHEETS photoelectrochemical cells photovoltaic-photoelectrochemical cells spin coating CuInS2 green hydrogen