Transition　metal　dichalcogenides　(TMDs),　such　as　rhenium　diselenide,　have　currently　attracted　a　lot　of　attention　as　one　of　the　novel　candidates　of　the　TMD　family.　However,　sample　fabrication　remains　a　significant　problem　due　to　poor　electrochemical　performance,　and　synthesizing　ReSe2　with　outstanding　tailored　features　to　encounter　the　high-level　demands　of　noble　metal　replacement　persists　a　challenge.　As　a　result,　we　suggest　a　method　for　the　production　of　ReSe2　with　controllable　morphologies　by　simply　changing　the　Re　:　Se　ratio　of　the　precursors.　Herein,　two　distinct　morphologies　i.e.　nanoparticles　and　nanobelts　of　ReSe2　were　synthesized　using　a　hot　injection　approach.　Phase　study　and　modes　of　vibrations　of　both　samples　were　investigated　using　X-ray　diffraction　crystallography　(XRD)　and　Raman　spectroscopy.　Scanning　electron　microscopy　(SEM)　and　transmission　electron　microscopy　(TEM)　confirmed　ReSe2　nanoparticle　and　nanobelt　morphologies.　The　nanobelts　ReSe2　outperformed　by　achieving　a　current　density　of　10　mA　cm−2　at　an　over-potential　of　96　mV　whereas　ReSe2　nanoparticles　attained　a　current　density　of　10　mA　cm−2　at　174　mV.　The　remarkable　electrocatalytic　performance　of　ReSe2　nanobelts　is　due　to　their　unique　morphology,　which　allows　for　quick　charge　transfer　kinetics　and　incredible　stability　even　after　1000　CV　cycles.　©　2022　The　Royal　Society　of　Chemistry.