Against the dual backdrop of achieving China’s “dual-carbon” goals and mitigating risks in green finance, this study systematically examines the mechanisms through which green bonds drive corporate green innovation, using data from Chinese A-share listed firms between 2011 and 2022. The findings show that the issuance of green bonds increases firms’ green patent applications by an average of 44.6 %, with more pronounced effects among non-state-owned enterprises, firms outside carbon-trading pilot regions, and those located in areas with weaker environmental regulation. Mechanism tests reveal two transmission channels. Internally, green bond proceeds alleviate financing constraints and expand R&D investment, contributing 12.7 % and 11.4 % of the overall innovation effect, respectively, thereby enhancing the efficiency of innovation resource allocation. Externally, green bonds improve stock liquidity and attract greater investor attention: enhanced liquidity accounts for 17.4 % of innovation growth, while analyst coverage and research reports contribute 4.9 % and 4.7 %, respectively, underscoring the role of market signaling in shaping innovation behavior. Theoretically, this study advances a “dual circulation” framework that integrates internal capital optimization with external market incentives, elucidating how green bonds simultaneously foster corporate resource reallocation and reputational gains. These insights provide firm-level evidence for identifying substantive environmental contributions, curbing greenwashing risks, and informing the design of differentiated carbon-neutral financial policies.
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